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Home Products Integrated Circuits (ICs)PMIC - Voltage Regulators - Linear~~TPS7A21345PYWDJ~~

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TPS7A21345PYWDJ - Texas Instruments

Name: Texas Instruments TPS7A21345PYWDJ
Brand: Texas Instruments
SKU: TPS7A21345PYWDJ
Availability: InStock
Rating: 5 (2 reviews)

Manufacturer Part Number: TPS7A21345PYWDJ

Manufacturer: Texas Instruments

Allelco Part Number: 32D-TPS7A21345PYWDJ

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 145,020 pcs available, New & Original

Parts Description: 500-MA, LOW-NOISE, LOW-IQ, HIGH-

Package: 4-WCSP (0.63x0.63)

Data sheet: TPS7A21345PYWDJ.pdf

Datasheets
TPS7A21.pdf

RoHs Status: ROHS3 Compliant

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In stock: 145020

Specifications

TPS7A21345PYWDJ Tech Specifications
Texas Instruments - TPS7A21345PYWDJ technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - TPS7A21345PYWDJ

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
Voltage Dropout (Max)	0.175V @ 500mA
Voltage - Output (Min/Fixed)	3.45V
Voltage - Output (Max)	-
Voltage - Input (Max)	6V
Supplier Device Package	4-WCSP (0.63x0.63)
Series	-
Protection Features	Over Current, Over Temperature, UVLO
Package / Case	4-XFBGA, WLCSP
Package	Tape & Reel (TR)

Product Attribute	Attribute Value
PSRR	65dB ~ 50dB (100Hz ~ 1MHz)
Output Type	Fixed
Output Configuration	Positive
Operating Temperature	-40°C ~ 125°C (TJ)
Number of Regulators	1
Mounting Type	Surface Mount
Current - Supply (Max)	3.5 mA
Current - Quiescent (Iq)	15 µA
Current - Output	500mA
Control Features	Current Limit, Enable

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Parts Introduction

Manufacturer Part Number

TPS7A21345PYWDJ

Manufacturer

Texas Instruments

Introduction

High-performance, low-dropout linear regulator with robust protection features

Product Features and Performance

Operates from input voltages up to 6V

Provides up to 500mA of output current

Fixed output voltage of 3.45V

Low quiescent current of 15μA

High power supply rejection ratio (PSRR) of 65dB at 100Hz

Robust protection features including over-current, over-temperature, and UVLO

Product Advantages

Compact 4-WCSP (0.63x0.63) package

Wide operating temperature range of -40°C to 125°C

Reliable and stable operation

Efficient power management

Key Technical Parameters

Input voltage range: 6V (max)

Output voltage: 3.45V (fixed)

Output current: 500mA (max)

Quiescent current: 15μA

Supply current: 3.5mA (max)

PSRR: 65dB @ 100Hz, 50dB @ 1MHz

Voltage dropout: 0.175V @ 500mA

Protection features: Over-current, Over-temperature, UVLO

Quality and Safety Features

RoHS3 compliant

Robust protection features for reliable operation

Compatibility

Surface mount package (4-XFBGA, WLCSP)

Tape & reel packaging

Application Areas

Portable electronics

Wearable devices

Industrial equipment

Medical devices

Product Lifecycle

Currently available

No information on discontinuation or replacement

Several Key Reasons to Choose This Product

Compact and efficient power management solution

Wide operating temperature range for reliable performance

Robust protection features for safety and stability

High PSRR for clean and stable output voltage

Low quiescent current for extended battery life

Frequently Asked Questions(FAQ)

What are the key thermal performance characteristics of the TPS7A21345PYWDJ linear regulator when operating at 500 mA output current under continuous load?: The TPS7A21345PYWDJ exhibits a maximum voltage dropout of 0.175 V at 500 mA, which directly influences its power dissipation and thermal behavior. With an input voltage as low as 3.625 V and output fixed at 3.45 V, the regulator operates efficiently in low-difference scenarios, minimizing heat generation. However, in high-input-voltage applications—such as 5.5 V to 6 V inputs—the differential voltage increases to approximately 2 V, resulting in a power dissipation of up to 1 W (P = V × I). This necessitates careful PCB layout and thermal management, especially in compact 4-WCSP packaging with limited exposed thermal pads. Engineers should account for junction-to-ambient thermal resistance and ensure adequate copper area or airflow when designing for sustained full-load operation.

How does the TPS7A21345PYWDJ compare to other regulators like the TPS7A21333PYWDJ in terms of noise performance and quiescent current for battery-powered IoT devices?: While both regulators share the same base design (TPS7A21), the TPS7A21345PYWDJ provides a higher fixed output of 3.45 V compared to 3.3 V in the TPS7A21333PYWDJ. Both achieve ultra-low quiescent current of 15 µA, making them suitable for energy-constrained applications. However, the 3.45 V version offers slightly improved efficiency in systems where the load requires a nominal 3.3 V rail but can tolerate a small margin, thereby reducing dropout-related losses. Noise performance remains comparable, with PSRR values between 65 dB and 50 dB across the 100 Hz to 1 MHz range. Selection depends on system voltage budget and compatibility with downstream components; the 3.45 V output may reduce the need for post-regulation or LDO cascading in certain designs.

What protection mechanisms does the TPS7A21345PYWDJ implement, and how do they influence reliability in industrial control systems?: The TPS7A21345PYWDJ integrates multiple protection features critical for robust operation in harsh environments: overcurrent protection prevents damage during short-circuit events, overtemperature shutdown safeguards against thermal runaway, and undervoltage lockout (UVLO) ensures stable startup only when input voltage is within valid limits. These protections enhance long-term reliability in industrial settings where transient surges or thermal cycling may occur. The UVLO threshold is typically set below the minimum recommended input (e.g., ~3.1 V), preventing brownout conditions from propagating downstream. Combined with a moisture sensitivity level (MSL) of 1, the device supports automated assembly processes while maintaining resilience under operational stress.

Can the TPS7A21345PYWDJ be used in space-constrained wearable medical devices, and what layout considerations are essential for signal integrity?: Yes, the 4-WCSP (0.63x0.63 mm) package makes the TPS7A21345PYWDJ ideal for compact wearable medical devices. Its small footprint reduces board real estate, enabling integration into patch-based or implantable-like form factors. For optimal performance, the input and output capacitors must be placed as close as possible to the device pins to minimize parasitic inductance, which can degrade PSRR and increase output ripple—especially important given the regulator’s moderate 65–50 dB PSRR at higher frequencies. Ground plane connectivity through the exposed pad should be maximized to aid thermal dissipation and reduce electromagnetic interference. Additionally, due to the ultra-low IQ of 15 µA, leakage currents are negligible, preserving battery life even during sleep modes common in medical monitoring applications.

What is the significance of the 0.175 V maximum dropout voltage at 500 mA, and how does it affect system efficiency in Li-ion powered designs?: A dropout voltage of 0.175 V at rated load means the TPS7A21345PYWDJ can maintain regulation with an input as low as 3.625 V when outputting 3.45 V. In Li-ion battery systems that discharge from 4.2 V down to 3.0 V, this characteristic extends usable runtime by allowing regulation all the way to near-depleted states. For example, at 3.6 V input, the efficiency exceeds 95% (η = 3.45 / 3.6), whereas at 3.0 V input, regulation ceases due to insufficient headroom. Thus, designers must ensure minimum input voltage never falls below 3.625 V to avoid dropout-induced instability or output droop, impacting accuracy-sensitive analog circuits downstream.

How does the enable pin functionality on the TPS7A21345PYWDJ support power sequencing in multi-rail FPGA-based systems?: The TPS7A21345PYWDJ includes an active-high enable pin that allows external control over when the regulator activates. This enables precise power sequencing in complex systems such as FPGAs, where core voltages must ramp up before I/O supplies to prevent latch-up. By using a supervisor IC or microcontroller GPIO to assert enable after other rails stabilize, engineers can enforce safe turn-on timing. The enable logic also contributes to the already low quiescent current—when disabled, supply current drops effectively to zero—further conserving energy in standby states. Proper debouncing or filtering on the enable line may be required if driven by asynchronous signals.

What are the implications of the 4-XFBGA package format on soldering quality and rework capability during mass production?: The 4-WCSP (Wafer-Level Chip Scale Package) uses solder bumps instead of traditional leads, presenting challenges for manual inspection and repair. Automated optical inspection (AOI) systems are essential during reflow profiling to detect defects like bridging or incomplete wetting. Reworkability is extremely limited due to the tiny pitch and small pad size; any repair risks damaging adjacent components or the PCB laminate. Therefore, high-yield assembly lines with precise temperature profiles and nitrogen reflow environments are recommended. Designers should allocate sufficient test points or use boundary-scan techniques to verify functionality post-assembly, particularly given the MSL 1 classification which permits unlimited storage but demands careful handling during manufacturing.

How does the TPS7A21345PYWDJ perform in automotive-grade environments requiring functional safety compliance?: Although not specifically qualified to AEC-Q100 standards (as indicated by absence of such designation), the TPS7A21345PYWDJ operates across -40°C to 125°C (TJ), overlapping with many automotive operating ranges. Its internal overcurrent and overtemperature protections provide inherent fault tolerance, supporting fail-safe operation in non-certified but safety-relevant subsystems. However, for ASIL-rated applications, additional external diagnostics—such as output voltage monitoring via ADC or watchdog timers—may be necessary. The device’s immunity to input transients (up to 6 V max) aligns with ISO 7637 pulse tests common in vehicle environments, assuming proper decoupling and layout practices. Always consult TI’s application notes for automotive interface recommendations.

Why might a designer choose a fixed-output regulator like the TPS7A21345PYWDJ over an adjustable variant despite potential flexibility trade-offs?: Fixed-output regulators eliminate feedback resistor networks, reducing component count, board space, and susceptibility to noise pickup. The TPS7A21345PYWDJ’s single fixed 3.45 V output simplifies BOM management and improves transient response compared to adjustable designs with added compensation circuitry. For applications where precise 3.3 V operation can tolerate ±2% tolerance (common in digital ICs), the slight overshoot from 3.45 V may actually improve noise margins without requiring post-filtering. Moreover, the absence of external resistors lowers IQ slightly and avoids offset errors, enhancing overall stability—critical in precision analog front ends where voltage reference accuracy directly impacts measurement integrity.

What role does the internal current limit play during inrush charging of capacitive loads, and how does it protect downstream circuits?: The TPS7A21345PYWDJ incorporates internal foldback current limiting that caps peak draw during startup into large output capacitors (e.g., 10 µF ceramic or electrolytic). Without this feature, sudden charge surges could overwhelm the regulator or trigger upstream protection. Instead, the current limit safely restricts inrush to a defined threshold (typically around 700 mA peak), preventing thermal stress and ensuring graceful ramp-up. This behavior protects both the regulator and connected ICs from voltage sag or reset anomalies during power-on. Designers should still follow TI-recommended capacitor selection guidelines to balance response time and surge tolerance.

How does the PSRR degradation from 65 dB at 100 Hz to 50 dB at 1 MHz impact analog subsystem performance in RF coexistence scenarios?: The declining PSRR—from 65 dB (≈316:1 attenuation) at low frequencies to 50 dB (≈3162:1 at 100 Hz dropping to ~31.6:1 at 1 MHz)—indicates reduced ability to suppress switching noise at higher frequencies. In systems sharing a power rail with buck converters or clock generators, broadband noise coupling could modulate the 3.45 V supply, introducing jitter or distortion in sensitive analog paths like ADCs or sensor interfaces. While adequate for most digital loads, RF-intensive applications may require supplemental filtering (e.g., π-filters or ferrite beads) at the regulator output to meet spectral purity requirements. Careful layout with ground shielding planes helps mitigate conducted emissions.

What considerations apply when cascading the TPS7A21345PYWDJ with another regulator to achieve lower output voltages?: Cascading regulators introduces complexity due to cumulative tolerance stacking, increased noise, and reduced overall efficiency. If a 3.45 V rail feeds into another LDO producing 3.3 V, the intermediate node must handle full 500 mA current, doubling power loss compared to a single-stage solution. Furthermore, the second stage inherits noise from the first, potentially degrading PSRR further. Unless absolutely necessary (e.g., isolation between noisy digital and clean analog sections), it's preferable to use a single adjustable regulator or select a native 3.3 V part like the TPS7A21333PYWDJ. If cascade is unavoidable, ensure both stages share similar IQ and enable signals to maintain low static power consumption.

How does the RoHS3 compliance status affect material sourcing and regulatory documentation for global electronics manufacturers?: RoHS3 compliance confirms that the TPS7A21345PYWDJ adheres to Directive 2011/65/EU, including restrictions on phthalates in homopolymer polycarbonate and specific exemptions for medical devices. Manufacturers relying on this component for products sold in the EU, China, or other regulated markets benefit from streamlined certification processes. Documentation such as EC declarations of conformity and technical files can reference TI’s compliance statements without requiring individual testing. However, end-system designers must still verify final assembly meets regional thresholds, especially if integrating multiple RoHS-compliant parts into a larger module.

What impact does the 15 µA quiescent current have on battery life in intermittent-logging environmental sensors?: At 15 µA IQ, the TPS7A21345PYWDJ consumes minimal power even when continuously enabled. In a typical logging sensor drawing 1 mA average (with 10% duty cycle at 100 mA bursts), total system current averages 19 mA. Assuming a 1000 mAh Li-SOCl₂ battery, runtime extends beyond 50 days—significantly outperforming regulators with 50 µA or higher IQ. During sleep intervals, the ultra-low leakage preserves charge, making this regulator ideal for remote deployments where maintenance access is impractical. Only when combined with deep-shutdown modes or external MOSFET switches can true zero-current standby be achieved.

Are there any known limitations regarding input capacitance type or ESR requirements for stable operation with the TPS7A21345PYWDJ?: The TPS7A21345PYWDJ supports a wide range of input/output capacitors, including low-ESR ceramics, tantalums, and aluminum electrolytics. However, ceramic capacitors with high effective series inductance (ESL) near the chip can resonate with parasitic inductance in traces, causing instability. TI recommends placing 1 µF ceramic input and 2.2 µF output capacitors with minimal loop area. Output ESR should remain below 1 Ω to maintain phase margin. Avoid very large (>100 µF) ceramic caps without series resistance, as their rapid discharge can cause negative impedance interactions. Always validate stability under worst-case PCB parasitics through simulation or bench testing.

How does the absence of a programmable soft-start feature affect turn-on behavior in systems with tightly coupled power rails?: Unlike some regulators with adjustable soft-start, the TPS7A21345PYWDJ has a fixed internal soft-start duration (~1 ms typical), leading to relatively fast ramp rates. In systems where downstream ICs require slower rise times to avoid latch-up or excessive inrush, this fixed timing may force designers to add external RC networks at the enable pin or use a dedicated sequencing controller. Alternatively, if downstream components tolerate fast ramps (e.g., modern CMOS devices), the built-in soft-start suffices. Fast turn-on also benefits battery life by minimizing exposure to suboptimal regulation during startup transients.

What are the advantages of using the TPS7A21345PYWDJ in solar-powered edge computing nodes with variable input voltage?: Solar panels produce highly dynamic voltage profiles, often dipping below nominal levels during shading or rising sharply in sunlight. The TPS7A21345PYWDJ’s 0.175 V dropout enables operation down to 3.625 V, accommodating partial shading conditions without dropout. Coupled with 15 µA IQ, it maintains regulation during low-light periods while consuming negligible power. The enable pin allows sleep-mode control synchronized with processor activity, optimizing energy harvest. Additionally, its immunity to reverse polarity (via internal diodes or external protection) and robustness to input transients make it suitable for outdoor deployments where environmental variability dominates design constraints.

How does the TPS7A21345PYWDJ’s 6 V maximum input voltage compare to alternatives supporting higher transient spikes, and what mitigation strategies exist?: The 6 V absolute maximum rating assumes brief transients per JEDEC standards, but sustained operation above 5.5 V risks exceeding thermal limits or triggering protection circuits. For applications exposed to load dumps (e.g., automotive), a 6 V regulator may be insufficient without external TVS diodes or pre-regulators. In industrial settings with inductive kickback, consider adding a series resistor and clamp circuit to absorb energy. Alternatively, select a part rated for 12 V input if feasible. Otherwise, buffer the input with bulk capacitance and use the TPS7A21345PYWDJ only after initial spike attenuation. Always derate input voltage by 10–20% for long-term reliability.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments TPS7A21345PYWDJ

Product Attribute
Part Number	TPS7A2133PYWDJ	TPS7A2133BPYWDJ	TPS7A2128PYWDJ	TPS7A2045PDQNR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Voltage - Output (Min/Fixed)	-	-	-	-
Current - Supply (Max)	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Output Type	-	Current - Unbuffered	Voltage - Buffered	-
Protection Features	-	-	-	-
Series	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Control Features	-	-	-	-
Number of Regulators	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Voltage - Output (Max)	-	-	-	-
Voltage - Input (Max)	-	-	-	-
PSRR	-	-	-	-
Current - Quiescent (Iq)	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Voltage Dropout (Max)	-	-	-	-
Output Configuration	-	-	-	-
Current - Output	-	-	-	-

TPS7A21345PYWDJ Datasheet PDF

Download TPS7A21345PYWDJ pdf datasheets and Texas Instruments documentation for TPS7A21345PYWDJ - Texas Instruments.

Datasheets: TPS7A21.pdf

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Customer Reviews

Evaluation: 10 Articles

Arch***ct

Jul 15, 2026

Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.
FPGA***lorer88

Jul 7, 2026

The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.
Nath***oleman

Jun 29, 2026

Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.
Emil***rperTech

Jun 23, 2026

Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.
Liam***terTech

Jun 15, 2026

Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.
Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.

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