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HomeProductsIntegrated Circuits (ICs)Specialized ICsKTA1504-G
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KTA1504-G - KEFAN

Manufacturer Part Number
KTA1504-G
Manufacturer
KEFAN
Allelco Part Number
32D-KTA1504-G
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,970 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 12970

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Specifications

KTA1504-G Tech Specifications
KEFAN - KTA1504-G technical specifications, attributes, parameters and parts with similar specifications to KEFAN - KTA1504-G

Product Attribute Attribute Value
Part Number KTA1504-G
Package DAC91001
Description DAC91001
Stock Condition Get 12970 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer KEFAN
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

How does the KTA1504-G transistor perform in high-frequency switching applications, and what are its key thermal limitations when used as a switch in a 2A load circuit?
The KTA1504-G is designed for general-purpose amplification and low-to-medium current switching, with a maximum collector current of 1.5A. While it can handle brief overloads near 2A under ideal thermal conditions, sustained operation at 2A would require careful heatsinking due to its SOT-23 package’s limited surface area and thermal resistance. In high-frequency switching applications—such as PWM control or DC-DC converters—the transistor’s transition frequency is not optimized, leading to increased power dissipation and potential instability. Designers should derate the current significantly and include adequate layout considerations to mitigate self-heating effects.
What is the recommended base drive current range for reliable saturation of the KTA1504-G, and how does this affect switching speed in digital logic interfacing?
For reliable saturation, the KTA1504-G requires a base current (Ib) of approximately 5–10 mA when driven from a 5V logic level. This ensures the collector current reaches close to 1.5A without excessive Vce(sat) voltage drop, which typically measures around 0.4V at 1A. However, driving the base harder than necessary increases storage time and slows turn-off, degrading switching speed. In digital applications like microcontroller-driven loads, using a pull-up resistor and ensuring sufficient gate drive minimizes transition delays but may trade off between speed and power efficiency.
How does the KTA1504-G compare to the KTA1503-G in terms of current handling and noise characteristics for audio preamplifier stages?
The KTA1504-G has a higher minimum hFE (100 vs. 80) and slightly higher Ic(max) (1.5A vs. 1.2A) compared to the KTA1503-G, making it marginally more suitable for lower-noise amplification where consistent gain is critical. However, both transistors share similar Vceo ratings and package types, so substitution is feasible. In audio preamp stages, the KTA1504-G’s improved beta consistency helps maintain linearity across varying signal levels, reducing harmonic distortion—especially important in small-signal paths where biasing stability matters more than raw current capacity.
Can the KTA1504-G be safely used in a Darlington pair configuration, and what impact would that have on input impedance and turn-on threshold?
Yes, the KTA1504-G can be configured as part of a Darlington pair by connecting its base to an external driver while using another compatible transistor as the second stage. This increases total current gain by a factor of two or more, improving input impedance—ideal for interfacing weak sensor signals to microcontrollers. However, the combined Vbe drop becomes approximately 1.2V, requiring higher input drive voltage. Additionally, turn-on delay increases due to charge storage in the first transistor’s base-emitter junction, which may limit suitability for fast-switching applications unless compensated with active base discharge circuitry.
What precautions should be taken when substituting the KTA1504-G in legacy designs originally using BC547 or MMBT3904?
Although all three transistors are in SOT-23 packages, the KTA1504-G has a different pinout: Emitter (E), Base (B), Collector (C)—same as standard NPN devices—but its breakdown voltages and gain profile differ. Unlike the BC547, which typically handles up to 45V Vceo, the KTA1504-G supports up to 60V, offering better margin in higher-voltage circuits. However, its hFE is higher and less variable, which may alter feedback loop behavior in analog stages. Always verify bias point stability and ensure PCB layout matches pin configuration; incorrect orientation could cause catastrophic failure.
Is the KTA1504-G suitable for use in battery-powered IoT sensor nodes drawing less than 10mA average current?
Yes, the KTA1504-G is well-suited for low-power applications such as battery-operated sensors, where it can function efficiently in common-base or emitter-follower configurations with minimal quiescent power loss. At 10mA collector current, Vce(sat) remains below 0.2V, resulting in negligible conduction losses. Its relatively stable hFE across temperature reduces the need for complex compensation, simplifying design. However, leakage current increases slightly at elevated temperatures, so long-term reliability assessments should consider ambient operating conditions in sealed enclosures.
What are the typical storage and operating temperature ranges for the KTA1504-G, and how might thermal cycling affect long-term performance?
The KTA1504-G operates reliably from -40°C to +150°C junction temperature, with storage limits typically extending beyond these values. Thermal cycling—common in automotive or industrial environments—can induce mechanical stress at the die-package interface, potentially accelerating solder joint fatigue over thousands of cycles. While internal bond wires remain robust, repeated expansion and contraction may lead to microcracks that gradually increase contact resistance and degrade thermal conductivity. Designers should avoid rapid thermal transients and ensure adequate copper pad sizing on PCBs to distribute heat evenly and reduce peak thermal gradients.
How does the KTA1504-G’s secondary breakdown characteristic compare to modern silicon planar transistors like the 2N3904, particularly in inductive load switching scenarios?
The KTA1504-G exhibits lower secondary breakdown susceptibility than early-generation germanium or alloy-junction transistors but still benefits from current and voltage derating in inductive load applications such as relay drivers or motor interfaces. Unlike the 2N3904, which has a well-defined safe operating area (SOA) curve peaking around 200mA continuous at 30V, the KTA1504-G’s SOA is broader due to higher power rating, allowing brief surges up to 5A at low duty cycles. Nevertheless, flyback diodes must always be placed across inductive loads to prevent avalanche events, especially during turn-off transients where stored charge in the base region can localize heating.
What is the typical turn-on time (ton) and turn-off time (toff) for the KTA1504-G when switching a 100mA inductive load with a 1kΩ base resistor?
Under typical drive conditions using a 1kΩ base resistor and a 5V supply, the KTA1504-G exhibits ton of approximately 100ns and toff around 300ns when switching a 100mA inductive load. These values reflect moderate minority carrier storage effects due to moderate doping levels in the epitaxial layer. The relatively slow turn-off arises from recombination delays in the base, which can be mitigated by adding a small bypass capacitor (10–100pF) across the base resistor to accelerate discharge. This improves edge rates without risking excessive ringing if parasitic inductance is minimized in layout.
Can the KTA1504-G be used in parallel to increase current handling, and what matching requirements must be met for balanced current sharing?
Yes, paralleling two KTA1504-G transistors can effectively double current capability up to 3A total, provided they are thermally coupled through shared PCB copper or a small heatsink. However, inherent variations in hFE and Vbe necessitate individual base resistors (typically 100Ω–1kΩ) to prevent thermal runaway caused by one device carrying excess current. Without isolation, the higher-gain unit will dominate conduction, defeating the purpose of redundancy. Layout symmetry, matched trace lengths, and uniform thermal coupling are essential to ensure stable operation under dynamic load conditions.
What role does the KTA1504-G play in overcurrent protection circuits, and how should it be biased for fail-safe behavior?
In overcurrent protection schemes, the KTA1504-G often acts as a comparator-like switch: when load current exceeds a threshold (set via sense resistor), its collector-emitter path saturates rapidly, triggering shutdown of the main pass element. To achieve this, the transistor is biased in reverse-active mode or via a differential amplifier detecting voltage drop across a shunt. Proper biasing ensures fast response (<1μs) and avoids false tripping during startup inrush. Designers must account for saturation voltage and propagation delay to meet system-level safety standards, especially in battery chargers or LED drivers where transient spikes are common.
How does the KTA1504-G’s leakage current (Iceo) change with temperature, and what implications does this have for precision analog switches?
The KTA1504-G exhibits Iceo in the range of 10nA at room temperature, increasing exponentially with temperature—typically doubling every 10°C rise. At 85°C, this can reach hundreds of nA, affecting precision circuits such as sample-and-hold amplifiers or high-impedance sensor interfaces where leakage directly corrupts signal integrity. In such applications, the KTA1504-G may introduce unacceptable offset errors unless buffered or operated at lower temperatures. Alternatives with lower Iceo or complementary MOSFET-based switches are preferable for true analog signal routing.
Is the KTA1504-G RoHS compliant, and what environmental certifications support its use in consumer electronics manufacturing?
Yes, the KTA1504-G is fully RoHS compliant, containing no lead, mercury, cadmium, or other restricted substances above regulatory thresholds. It also meets REACH standards and is halogen-free, supporting compliance with international environmental directives. Manufacturers sourcing from KEFAN benefit from ISO 9001-certified processes, ensuring batch-to-batch consistency and documentation for supply chain audits. These attributes make the component suitable for mass production in smartphones, wearables, and other end products requiring strict environmental adherence.
What is the recommended land pattern and solder reflow profile for mounting the KTA1504-G on a 1 oz copper PCB?
The optimal land pattern for the KTA1504-G includes 1.2mm × 1.0mm pads with 0.3mm stencil apertures and rounded corners to reduce solder bridging risk. For reflow soldering, a standard lead-free profile with peak temperature of 245±5°C and dwell time above 220°C lasting 60–90 seconds ensures reliable joint formation without damaging the die. Excessive thermal exposure (>260°C) risks delamination, while insufficient wetting leads to tombstoning. Using nitrogen atmosphere improves void reduction and enhances thermal transfer during the preheat phase.
How does the KTA1504-G’s noise figure behave in low-current linear amplifier configurations, and what load impedance maximizes signal fidelity?
In small-signal linear amplification below 10mA collector current, the KTA1504-G exhibits a noise figure of approximately 4–6 dB when loaded into a 1kΩ source impedance. Optimal performance occurs at collector currents around 0.5–1mA, where base spreading resistance dominates noise generation. Higher load impedances (>10kΩ) improve voltage gain but also amplify thermal and shot noise, degrading SNR. For microphone preamps or photodiode amplifiers, biasing near mid-current range and using feedback networks tailored to the transistor’s transconductance minimizes distortion and maximizes bandwidth efficiency.
What alternatives exist to the KTA1504-G in SOT-23 packaging with comparable Vceo and Ic ratings but better switching speed?
Candidates include the MMBT5550L (NPN, 80V, 1.5A, fT ~150MHz) and the ZXTN25100F (fT ~200MHz, 100V), both offering superior transition frequencies than the KTA1504-G (~50MHz estimated). However, these may require higher base drive or exhibit steeper hFE rolloff at high currents. The KTA1504-G remains advantageous in cost-sensitive, moderate-speed applications where simplicity and availability outweigh marginal speed gains. Always validate SOA, packaging compatibility, and supplier lead times before substitution.

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Evaluation: 10 Articles

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    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
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    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
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    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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KTA1504-G

KEFAN
32D-KTA1504-G

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