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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated 2DA1971Q-7

Name: 2DA1971Q-7
Brand: Diodes Incorporated
SKU: 2DA1971Q-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2DA1971Q-7

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: 2DA1971Q-7.pdf

Description:: TRANS PNP 400V 0.5A SOT-89-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2DA1971Q-7 from Diodes Incorporated is a PNP bipolar junction transistor (BJT) engineered for high-voltage automotive switching applications, featuring -400 V collector-emitter breakdown voltage (BV_CEO), -0.5 A continuous collector current (I_C), and AEC-Q101 qualification. Its SOT89 package integrates an exposed collector pad for thermal management, enabling reliable operation in ignition systems and LED drivers where high-voltage isolation and pulse robustness are critical.

For engineers reviewing the 2DA1971Q-7 datasheet, 2DA1971Q-7 pinout, 2DA1971Q-7 application, or 2DA1971Q-7 equivalent, key selection criteria include verified -400 V BV_CEO, h_FE ≥ 140 at -100 mA, V_CE(SAT) ≤ -250 mV at -100 mA/-10 mA drive, thermal resistance R_θJL = 10.4 °C/W, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This PNP BJT operates in common-emitter configuration with strict high-voltage blocking capability up to -400 V and supports pulsed switching at I_CM = -1 A. Its gain stability (h_FE = 140–450) across -20 mA to -100 mA ensures predictable base drive requirements in inductive load control.

The device uses a thermally enhanced SOT89 package with exposed collector pad soldered to PCB copper, delivering R_θJL = 10.4 °C/W and enabling 1.5 W steady-state power dissipation under defined 25 mm × 25 mm 1 oz FR-4 layout conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
BV_CEO	-400 V - Ensures safe blocking of transients in 24 V/42 V automotive systems with margin against load dump spikes.
I_C (continuous)	-0.5 A - Supports sustained current in fuel injector drivers and solenoid controls without derating at T_A ≤ 100°C.
h_FE	140–450 @ -20 mA to -100 mA - Enables low-base-current drive for efficient gate/base control in discrete switch stages.
V_CE(SAT)	≤ -250 mV @ -100 mA/-10 mA - Minimizes conduction loss and self-heating during active switching in high-side configurations.
R_θJL	10.4 °C/W - Confirmed thermal path from junction to solder point enables direct thermal coupling to PCB copper for stable pulse operation.
ESD HBM	8,000 V - Meets JEDEC Class 3B for handling robustness in automated assembly environments.
T_J range	-55 to +150 °C - Validated operating envelope for under-hood automotive locations including engine control modules.

Pinout & Package

2DA1971Q-7 is housed in a surface-mount SOT89 package with molded green plastic housing (UL 94V-0), matte tin-plated leads, and an exposed collector pad on the underside for thermal conduction. The package weighs approximately 0.05 g and complies with J-STD-020 moisture sensitivity Level 1.

Pin/Terminal	Circuit Role	Design Meaning
Collector (C)	Main current sink terminal	Exposed metal pad - must be soldered to ≥25 mm² 1 oz copper for rated R_θJL and power handling.
Emitter (E)	Current source reference node	Connected to system ground or high-side rail return; carries full load current with minimal voltage drop.
Base (B)	Control input for minority-carrier injection	Receives negative current to turn on; requires -10 mA typical for full saturation at -100 mA collector load.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive temperature cycling, humidity, and mechanical stress per Rev G standard - no requalification needed for Tier 1 designs.
High-voltage blocking	BV_CEO = -400 V exceeds ISO 7637-2 Pulse 5a (load dump) requirements for 24 V systems by >2× margin.
Green construction	Lead-free, halogen-free (<900 ppm Br/Cl), antimony-free - compliant with RoHS 2015/863/EU and automotive OEM substance restrictions.
Pulse robustness	Safe Operating Area (SOA) validated to -320 V / -0.5 A DC and -200 V / -100 mA transient - supports ignition coil primary switching.

Applications

Automotive Ignition Coils

LED Headlamp Drivers

Use Scenario: Switching primary winding of distributorless ignition systems in gasoline engines.

IC Role / Device Role / Timing Role: High-voltage PNP switch controlling coil energy buildup and collapse timing.

Use Value: -400 V BV_CEO withstands flyback spikes >300 V; fast storage/fall times (2165 ns / 185 ns) enable precise spark timing control.

Use Scenario: High-side current regulation for adaptive front-lighting systems (AFS) with matrix LED arrays.

IC Role / Device Role / Timing Role: Discrete high-voltage switch enabling individual LED string activation in 24 V vehicle architectures.

Use Value: -0.5 A I_C and -250 mV V_CE(SAT) minimize power loss per channel; AEC-Q101 ensures field reliability over 15-year vehicle lifetime.

Fuel Injector Drivers

Industrial Solenoid Controllers

Use Scenario: Driving peak-and-hold current profiles in multi-point fuel injectors for gasoline direct injection (GDI).

IC Role / Device Role / Timing Role: High-side PNP switch managing injector coil energization and de-energization phases.

Use Value: h_FE ≥ 140 at -100 mA ensures stable base drive across temperature; -55 to +150 °C T_J range covers under-hood thermal extremes.

Use Scenario: Controlling 24–48 V DC solenoids in industrial valve actuators and pneumatic systems.

IC Role / Device Role / Timing Role: Robust discrete switch replacing relays in PLC output modules requiring >100,000 cycle life.

Use Value: R_θJL = 10.4 °C/W enables 1.5 W dissipation without heatsink; PPAP-capable documentation supports industrial OEM qualification.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX951	BV_CEO = -300 V; h_FE = 100–300; SOT89 package; no AEC-Q101 qualification	Limited to non-automotive 24 V systems; unsuitable for load dump immunity-critical designs	Select only for cost-sensitive industrial controls where -400 V margin is not required.
MJD2955T4G	BV_CEO = -60 V; I_C = -10 A; TO-220 package; AEC-Q101 qualified	Lower voltage rating but higher current capacity; requires heatsink for >1 W operation	Prefer for high-current, low-voltage solenoid drives where thermal mass outweighs board space constraints.

Compared with ZTX951 and MJD2955T4G, the 2DA1971Q-7 uniquely balances -400 V blocking, AEC-Q101 compliance, SOT89 footprint, and 1.5 W thermal capability-making it optimal for space-constrained, high-reliability automotive switching where voltage margin and qualification are non-negotiable.

Availability

2DA1971Q-7 is available at Aetrix Electronics and suitable for automotive ignition systems, LED headlamp drivers, fuel injector control modules, and industrial solenoid controllers requiring stable component supply across extended production lifecycles.

Supply support for 2DA1971Q-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets with ISO/TS 16949-certified operations.

The 2DA1971Q-7 belongs to Diodes' AEC-Q101-qualified high-voltage BJT product line, designed specifically for automotive power switching applications demanding robust transient immunity, thermal efficiency, and long-term reliability in harsh environments.

FAQ

What is the maximum allowable collector-emitter voltage for continuous operation?

The 2DA1971Q-7 has a guaranteed minimum BV_CEO of -400 V under test condition I_C = -1 mA. For continuous operation, design must maintain V_CE ≤ -320 V per datasheet ICES test condition to ensure long-term reliability and avoid avalanche degradation in automotive environments.

Can this transistor be used in a high-side switch configuration with 24 V supply?

Yes - the 2DA1971Q-7 is a PNP device optimized for high-side switching. With V_CC = -24 V referenced to ground, its -400 V BV_CEO provides >16× safety margin against transients, and its -250 mV V_CE(SAT) at -100 mA ensures <2.5 W total loss in typical 24 V solenoid driver topologies.

Is the SOT89 package lead-free and RoHS-compliant?

Yes - the 2DA1971Q-7 is fully RoHS 3 compliant (2015/863/EU), with no intentionally added lead, halogens (<900 ppm Br/Cl), or antimony. Its matte tin-plated leads meet MIL-STD-202 Method 208 solderability requirements and UL 94V-0 flammability rating.

Does this part require external base current limiting in switching applications?

Yes - the absolute maximum base current is -250 mA. For reliable saturation at I_C = -100 mA, a base resistor must limit IB to -10 mA (h_FE-based design), and transient protection (e.g., clamping diode) is recommended to prevent reverse-bias E-B junction breakdown during inductive flyback events.

2DA1971Q-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 40mA, 200mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 140 @ 20mA, 5V

Power - Max:: 1.5 W

Frequency - Transition:: 75MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

2DA1971Q-7 FAQ

1.How can I place an order for 2DA1971Q-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2DA1971Q-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2DA1971Q-7 reliable?

The price and inventory of 2DA1971Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2DA1971Q-7 is usually 5 days.

3.What payment methods are accepted for 2DA1971Q-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2DA1971Q-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2DA1971Q-7?

2DA1971Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2DA1971Q-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2DA1971Q-7?

For technical support, including 2DA1971Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2DA1971Q-7 requirements.

6.How does Aetrix verify that 2DA1971Q-7 is sourced from the original manufacturer or authorized distributors?

All 2DA1971Q-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2DA1971Q-7 meets industry standards.

7.What is the process for return or replacement of 2DA1971Q-7?

All 2DA1971Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with 2DA1971Q-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2DA1971Q-7 part is unused and in its original packaging.

Return procedure for 2DA1971Q-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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