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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsAS1324-BTTT-12
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AS1324-BTTT-12 - ams OSRAM

Manufacturer Part Number
AS1324-BTTT-12
Manufacturer
ams OSRAM
Allelco Part Number
32D-AS1324-BTTT-12
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
17,210 pcs available, New & Original
Parts Description
IC REG BUCK 1.2V 600MA TSOT23-5
Package
TSOT-23-5
Data sheet
AS1324-BTTT-12.pdf

Datasheets

AS1324.pdf

PCN Obsolescence/ EOL

EOL 14/Dec/2016.pdf
RoHs Status
 
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Specifications

AS1324-BTTT-12 Tech Specifications
ams OSRAM - AS1324-BTTT-12 technical specifications, attributes, parameters and parts with similar specifications to ams OSRAM - AS1324-BTTT-12

Product Attribute Attribute Value
Manufacturer ams OSRAM
Voltage - Output (Min/Fixed) 1.2V
Voltage - Output (Max) -
Voltage - Input (Min) 2.7V
Voltage - Input (Max) 5.5V
Topology Buck
Synchronous Rectifier Yes
Supplier Device Package TSOT-23-5
Series -
Package / Case SOT-23-5 Thin, TSOT-23-5
Product Attribute Attribute Value
Package Tape & Reel (TR)
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 85°C (TA)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 1.5MHz
Current - Output 600mA

Environmental & Export Classifications

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

Frequently Asked Questions(FAQ)

What are the key performance trade-offs when selecting the AS1324-BTTT-12 for a 600mA power rail in a compact space-constrained design?
The AS1324-BTTT-12 offers high efficiency and small footprint with its 1.5MHz switching frequency and TSOT-23-5 package, enabling space savings over larger modules. However, the fixed 1.2V output limits flexibility—designers must use an external LDO or post-regulation if other voltages are needed. While synchronous rectification improves efficiency at higher loads, the 600mA current limit may require parallel regulators or alternative ICs like the AS1326 (1A version) for future scalability.
How does the AS1324-BTTT-12 compare to other buck regulators in terms of input voltage range and thermal behavior under continuous load?
With an input range of 2.7V to 5.5V, the AS1324-BTTT-12 is suitable for Li-ion and USB-powered applications but narrower than some automotive-grade regulators supporting up to 18V. At full 600mA output, internal power dissipation can reach ~30mW under worst-case conditions, requiring careful PCB layout with adequate copper pour and minimal trace resistance. In contrast, higher-voltage-input alternatives dissipate more power for the same output, increasing junction temperature and reducing reliability margin.
Can the AS1324-BTTT-12 be used reliably in industrial environments without additional thermal management?
Yes, within specified operating limits. The AS1324-BTTT-12 functions across -40°C to 85°C ambient temperature and includes thermal shutdown protection. For typical PCB layouts with 2oz copper and proper grounding, it maintains safe junction temperatures even at sustained 600mA loads. However, prolonged operation near maximum current in tightly packed enclosures may necessitate derating or forced airflow to prevent thermal throttling or accelerated aging.
Is it possible to modify the output voltage of the AS1324-BTTT-12 using external components, and what are the risks involved?
No, the AS1324-BTTT-12 has a fixed 1.2V output and does not support external feedback resistors. Attempting to alter this via external circuitry could violate absolute maximum ratings or disrupt internal compensation, leading to instability or output droop. If variable or adjustable output is required, designers should consider alternative models such as the AS1325, which offers adjustable output from 0.8V to 3.3V via an external resistor divider.
What impact does switching frequency have on EMI and component selection when using the AS1324-BTTT-12?
The AS1324-BTTT-12 operates at 1.5MHz, placing it above most audio ranges and reducing audible noise. However, this also means larger inductor values are needed compared to lower-frequency converters, affecting transient response. High-frequency operation increases conducted EMI risk, so careful attention to layout—short traces, ground plane continuity, and decoupling near the IC—is essential. Ferrite beads on input/output lines may be required for compliance in sensitive RF environments.
How does the synchronous rectifier feature in the AS1324-BTTT-12 affect efficiency across different load currents?
Synchronous rectification improves efficiency by replacing the body diode of a standard diode with a low-RDS(on) MOSFET, reducing conduction losses. At moderate to high loads (above 200mA), the AS1324-BTTT-12 achieves over 90% efficiency when stepping down from 3.3V to 1.2V. Efficiency drops slightly at light loads due to gate drive overhead, but remains superior to asynchronous designs in the same class, especially in battery-powered systems where energy conservation is critical.
Are there any known compatibility issues between the AS1324-BTTT-12 and common microcontroller power rails during startup sequencing?
The AS1324-BTTT-12 does not include built-in soft-start or enable pin functionality, so external control may be needed for coordinated power-up. If used to supply a microcontroller core rail, simultaneous activation with other supplies could cause inrush surges. Adding a dedicated enable pin driven by a supervisor IC or using a power sequencer ensures monotonic rise times and prevents brownout resets during boot.
What precautions should be taken when replacing the AS1324-BTTT-12 with another regulator in existing designs?
Pin compatibility is critical—the AS1324-BTTT-12 uses a TSOT-23-5 footprint, but minor variations in pinout across manufacturers may exist. Verify that the replacement supports identical input/output ranges, switching frequency, and has similar ESD protection levels. Also confirm that external passive components (inductor, capacitors) are rated for the new IC’s requirements, particularly ripple current and voltage stress, to avoid failure modes during migration.
How does the moisture sensitivity level (MSL) rating of MSL 1 affect handling and storage for the AS1324-BTTT-12?
With an MSL rating of 1, the AS1324-BTTT-12 is considered non-hygroscopic and can withstand unlimited exposure to ambient humidity before assembly, simplifying inventory management. However, standard anti-static precautions remain necessary during handling due to CMOS-sensitive inputs. Proper ESD protection during manual soldering or automated placement is still mandatory to prevent latent damage that might manifest later in field operation.
Can multiple AS1324-BTTT-12 units be paralleled to increase output current capacity?
Paralleling the AS1324-BTTT-12 is not recommended due to potential current imbalance caused by slight variations in internal reference voltages and switching thresholds. Unequal sharing leads to one device overheating while the other underutilizes capacity. Instead, redesign the system to use a single higher-current buck regulator such as the AS1326 or implement a master-slave configuration only after thorough characterization and current-sharing circuitry validation.
What role does the base product number AS1324 play in supply chain planning for the AS1324-BTTT-12?
The base product number AS1324 identifies all variants of this buck regulator family, including fixed-voltage versions like the BTTT-12 and potentially adjustable ones. This simplifies procurement and BOM standardization across product lines. Suppliers often carry broader coverage under the base number, improving availability and reducing qualification effort for derivative parts during long-term product development cycles.
How does the ECCN classification of EAR99 influence export considerations for the AS1324-BTTT-12?
Classified under ECCN EAR99, the AS1324-BTTT-12 is subject to U.S. Export Administration Regulations but generally requires no special license for commercial shipments worldwide unless incorporated into defense-related systems. This simplifies global distribution logistics but mandates compliance checks when integrating into end products destined for restricted regions or sectors governed by additional trade controls.
Why might a designer choose the AS1324-BTTT-12 over a linear regulator for a 1.2V supply from a 3.3V source?
The AS1324-BTTT-12 reduces power loss significantly compared to a linear regulator. For example, delivering 600mA at 1.2V from a 3.3V input saves approximately 1.26W of heat dissipation—critical in space-constrained devices. Even with switching losses, the overall efficiency exceeds 85%, whereas a linear LDO would waste over 70% as heat, requiring heatsinking or limiting usable current. This makes the AS1324-BTTT-12 ideal for portable electronics where thermal budget and battery life are paramount.
What are the implications of the HTSUS code 8542.39.0001 for import duties and customs clearance involving the AS1324-BTTT-12?
Coded as 8542.39.0001 under the Harmonized Tariff Schedule of the United States, the AS1324-BTTT-12 falls under "Electronic Integrated Circuits" with reduced or duty-free treatment in many countries due to its commercial nature. Accurate declaration using this code facilitates smoother cross-border logistics but requires alignment with local regulations, as interpretations vary by importing jurisdiction and bilateral trade agreements.
How does the absence of an integrated enable pin affect system-level power control when using the AS1324-BTTT-12?
Without an enable pin, the AS1324-BTTT-12 turns on whenever Vin exceeds the UVLO threshold (~2.7V), which may conflict with intelligent power management schemes. Designers must rely on input filtering, series pass elements, or external controllers to gate power. Alternatively, adding a small N-channel FET at the input allows software-controlled shutdown, though this introduces slight voltage drop and adds component count versus fully integrated solutions.
What are the consequences of exceeding the maximum junction temperature of the AS1324-BTTT-12 during operation?
Prolonged exposure beyond 150°C (typical TJmax) triggers thermal shutdown, protecting the IC but interrupting regulated supply until cooling resumes. Repeated thermal cycling accelerates solder joint fatigue and semiconductor degradation, shortening mean time between failures. Even brief excursions above 125°C reduce long-term reliability, especially in sealed or high-ambient environments where natural convection is insufficient for heat dissipation.
How does the 1.5MHz switching frequency of the AS1324-BTTT-12 influence inductor and capacitor selection in practical layouts?
The 1.5MHz frequency enables smaller magnetics—typically a 4.7µH inductor with 1A saturation current suffices for 600mA output—but demands low ESR ceramic capacitors for effective filtering. Output capacitance must handle ripple currents up to ~300mA peak, favoring X5R/X7R MLCCs in parallel with small tantalums for bulk storage. Layout parasitics become dominant at this frequency, necessitating tight coupling between input/output caps and the IC to maintain stability and minimize radiated emissions.
Can the AS1324-BTTT-12 be safely used in medical wearable devices requiring strict fault tolerance?
While the AS1324-BTTT-12 meets industrial temperature and basic functional requirements, it lacks diagnostic features such as overcurrent lockout, overtemperature alerts, or status reporting pins required for safety-critical applications. In medical wearables, where user safety depends on reliable power delivery, additional monitoring circuitry or selection of a more robust automotive-grade PMIC may be necessary to meet IEC 60601 standards and ensure fail-safe operation under fault conditions.

Parts with Similar Specifications

The three parts on the right have similar specifications to ams OSRAM AS1324-BTTT-12

Product Attribute AS1324-BTTT-15 AS1324-BTTT-18 AS1323-BTTT-27 AS1324-BTTT-AD
Part Number AS1324-BTTT-15 AS1324-BTTT-18 AS1323-BTTT-27 AS1324-BTTT-AD
Manufacturer ams OSRAM ams OSRAM ams OSRAM ams OSRAM
Voltage - Input (Max) - - - -
Output Configuration - - - -
Number of Outputs - - - -
Synchronous Rectifier - - - -
Voltage - Input (Min) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current - Output - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Topology - - - -
Series - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Output (Max) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Frequency - Switching - - - -
Voltage - Output (Min/Fixed) - - - -
Function - - - -

AS1324-BTTT-12 Datasheet PDF

Download AS1324-BTTT-12 pdf datasheets and ams OSRAM documentation for AS1324-BTTT-12 - ams OSRAM.

Datasheets
AS1324.pdf
PCN Obsolescence/ EOL
EOL 14/Dec/2016.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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AS1324-BTTT-12 Image

AS1324-BTTT-12

ams OSRAM
32D-AS1324-BTTT-12

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