Diodes Incorporated 2DA1971-13

Overview

2DA1971-13 from Diodes Incorporated is a PNP high-voltage switching transistor in SOT89 package, rated for -400V V_CEO, -0.5A continuous collector current, and 1.5W power dissipation. It delivers high DC current gain (h_FE ≥ 140 @ I_C = -100mA), low V_CE(sat) (-250mV @ I_C = -100mA, I_B = -10mA), and is AEC-Q101 qualified for automotive reliability. It serves as a robust high-side switch in flyback snubber circuits and industrial HVDC power supplies.

For engineers reviewing the 2DA1971-13 datasheet, 2DA1971-13 pinout, 2DA1971-13 application, or 2DA1971-13 equivalent, key selection criteria include verified -400V breakdown rating, SOT89 thermal performance with R_θJL = 10.4°C/W, pulse switching timing (t_s = 2165ns), and AEC-Q101 qualification status for automotive-grade designs.

Technical Context

This PNP bipolar junction transistor operates in saturation/switching mode with fixed emitter-base control logic. Its high V_CEO and V_CBO ratings (-400V) enable use in primary-side switching of offline AC/DC converters where voltage transients exceed 300V. The exposed collector pad improves thermal conduction to PCB copper, supporting stable operation up to +150°C junction temperature.

Electrical behavior is defined by pulsed test conditions (≤300µs, ≤2% duty cycle) for f_T = 75MHz, V_CE(sat), and V_BE(sat). Leakage currents are specified at high reverse bias (I_CES ≤ -100nA @ V_CE = -320V), confirming suitability for high-impedance hold-off applications.

Key Specifications

Pinout & Package

SOT89 package with exposed collector pad (pin 1), emitter (pin 2), and base (pin 3). Molded green compound, UL 94V-0 rated, 0.05g weight. Mounting requires 25mm × 25mm 1oz copper pad for rated thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX653 and MJD2955T4G, the 2DA1971-13 uniquely combines -400V rating, AEC-Q101 qualification, and SOT89 thermal efficiency-making it the only option for space-constrained, automotive-grade HV switching where both voltage margin and reliability are mandatory.

Availability

2DA1971-13 is available at Aetrix Electronics and suitable for industrial flyback snubbers, automotive ignition coil drivers, and AC/DC auxiliary supplies requiring stable component supply and long-term lifecycle support.

Supply support for 2DA1971-13 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The 2DA1971 belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for ruggedized switching in automotive, industrial, and appliance power systems where voltage transients exceed 300V.

FAQ

What is the maximum allowable continuous power dissipation for 2DA1971-13 at 100°C ambient?

At T_A = 100°C, the maximum continuous power dissipation is derated to approximately 0.9W, calculated using the 1.5W rating at 25°C and R_θJA = 83°C/W. This assumes mounting on 25mm × 25mm 1oz copper on FR4 with still air conditions. Exceeding this limit risks junction temperature exceeding +150°C.

Can 2DA1971-13 replace an NPN transistor in the same circuit?

No-it is a PNP device requiring reversed polarity: emitter connects to higher potential, collector to load/ground, and base driven negative relative to emitter. Direct NPN substitution would invert logic and violate biasing requirements. Circuit redesign-including level shifting and supply polarity-is mandatory for functional equivalence.

Is the SOT89 footprint compatible with standard reflow profiles for lead-free assembly?

Yes-the matte tin-plated leads meet MIL-STD-202 Method 208 solderability requirements, and the "Green" molding compound is rated for peak reflow temperatures up to 260°C per J-STD-020 Level 1 moisture sensitivity. No pre-bake is required before standard Pb-free reflow.

Does the AEC-Q101 qualification cover all parametric limits in the datasheet?

AEC-Q101 testing validates reliability (temperature cycling, HTRB, ESD, etc.) but does not re-test every electrical parameter. The -400V V_CEO, h_FE ≥ 140, and leakage specs remain guaranteed per the DS35669 datasheet; qualification confirms those parameters remain stable over lifetime stress in automotive environments.