Diodes Incorporated ZTX956STOB

Overview

ZTX956STOB from Diodes Incorporated is a PNP silicon planar medium-power high-current bipolar junction transistor (BJT), designed for switching and linear amplification in industrial power control circuits. It delivers −2 A continuous collector current, −5 A peak pulse current, −200 V V_CEO, 100–300 h_FE across 10 mA–2 A, and V_CE(sat) as low as −110 mV at −1 A/−100 mA drive - used in DC-DC converter output stages and motor driver H-bridge high-side switches.

For engineers reviewing the ZTX956STOB datasheet, ZTX956STOB pinout, ZTX956STOB application, or ZTX956STOB equivalent, key selection criteria include verified PNP polarity, TO-92 compatible E-Line package thermal performance (R_th(j-amb) = 150 °C/W), −200 V breakdown rating, low saturation voltage under high current, and gain stability up to 2 A - critical for reliable high-voltage switching in automotive body control modules and industrial relay drivers.

Technical Context

This PNP BJT operates with emitter-grounded configuration in common-emitter topology, supporting both linear amplification and saturated switching modes. Its h_FE remains ≥100 at −2 A (IC=−2 A, V_CE=−5 V), and V_CE(sat) stays ≤−150 mV up to −2 A with −400 mA base drive - enabling efficient high-current turn-on without secondary breakdown risk.

The device features a rugged −220 V V_CBO rating and −6 V V_EBO, allowing operation in high-voltage bias networks. Its f_T of 110 MHz (IC=−100 mA, V_CE=−10 V) supports fast switching in PWM-controlled power stages, while C_obo = 32 pF ensures predictable capacitive loading in gate-drive interface applications.

Key Specifications

Pinout & Package

Package: E-Line TO-92 compatible (3-lead plastic, straight lead form, JEDEC TO-92 outline). Mounting requires minimum 1 inch² copper area on PCB for rated P_tot = 1.2 W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD2955G and ZTX951, ZTX956STOB uniquely balances TO-92 compactness, −200 V capability, and −110 mV saturation at 1 A - making it optimal for space-constrained, high-reliability 24–48 V industrial controls where thermal management relies on PCB copper rather than external heatsinks.

Availability

ZTX956STOB is available at Aetrix Electronics and suitable for industrial relay drivers, automotive body control units, DC-DC converter output stages, and H-bridge motor driver stages requiring stable component supply across extended temperature ranges and high-voltage transients.

Supply support for ZTX956STOB 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 power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.

ZTX956STOB belongs to Diodes' ZTX series of high-voltage PNP transistors, engineered specifically for robust switching in harsh-environment power interfaces - emphasizing breakdown resilience, gain consistency, and thermal survivability in unheatsinked PCB-mount applications.

FAQ

Is ZTX956STOB RoHS compliant and halogen-free?

Yes, ZTX956STOB meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The device uses lead-free matte tin plating on leads and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 - unlimited floor life at ≤30°C/60% RH.

Can ZTX956STOB be used in avalanche mode?

No - ZTX956STOB is not rated or characterized for repetitive avalanche operation. Its SOA curve defines safe switching limits only under clamped inductive loads with external snubbers or freewheeling diodes. Avalanche energy ratings are not specified in the datasheet.

What is the maximum allowable base-emitter reverse voltage?

The absolute maximum V_EBO is −6 V. Exceeding this risks permanent degradation of the emitter-base junction. In practice, a 10 kΩ pull-up resistor to V_CC is recommended when driving from open-collector logic to limit reverse bias during turn-off transients.

Does ZTX956STOB require a base resistor in TTL-driven applications?

Yes - direct TTL output connection risks excessive base current. With V_OL ≈ 0.4 V and V_BE(sat) ≈ −920 mV, a 100–220 Ω series resistor is required to limit I_B to ≤−400 mA for −2 A operation, preventing logic output damage and ensuring controlled saturation.