Diodes Incorporated ZTX1151A

Overview

ZTX1151A from Diodes Incorporated (formerly Zetex plc) is a PNP silicon planar medium-power high-gain bipolar junction transistor rated for −40 V V_CEO, −3 A continuous collector current, and 1 W power dissipation at T_amb = 25°C; it delivers low V_CE(sat) down to −60 mV at I_C = −0.1 A / I_B = −1 mA and h_FE up to 800 at I_C = −10 mA, used in linear regulators, relay drivers, and DC-DC converter output stages.

For engineers reviewing the ZTX1151A datasheet, ZTX1151A pinout, ZTX1151A application, or ZTX1151A equivalent, key selection criteria include verified PNP polarity, TO-92-compatible E-Line package, −40 V V_CEO rating, −3 A I_C capability, and h_FE ≥ 270 at I_C = −10 mA - all critical for medium-power switching and amplification in industrial control and power management circuits.

Technical Context

This PNP BJT operates with emitter-grounded configuration and exhibits high DC current gain across its full operating range: h_FE = 450 (min) at I_C = −10 mA, 180 (min) at I_C = −2 A, and 40 (min) at I_C = −5 A, enabling stable biasing in both linear and saturated switching modes. Its f_T = 145 MHz supports fast-switching applications up to several tens of MHz.

V_CE(sat) remains tightly controlled - −115 mV max at I_C = −0.5 A / I_B = −5 mA and −240 mV max at I_C = −3 A / I_B = −250 mA - while V_BE(sat) reaches −1.05 V max under heavy drive, confirming robust base control and low conduction loss in power stage designs.

Key Specifications

Pinout & Package

Package: TO-92-compatible E-Line plastic package with standard lead configuration (Emitter-Base-Collector), designed for through-hole mounting and compatible with legacy ZTX series footprint requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Compared with ZTX1151A, ZTX1149A trades current headroom for enhanced voltage safety margin, while MJD2955T4G provides scalable power at the cost of package compatibility and board-level integration - making ZTX1151A optimal for compact, medium-power through-hole designs needing balanced gain, speed, and thermal performance.

Availability

ZTX1151A is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) I/O modules, and DC-DC converter designs requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for ZTX1151A 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 acquired Zetex plc in 2008 and maintains its high-performance discrete portfolio, specializing in precision analog and power semiconductors for industrial, automotive, and computing markets.

ZTX1151A belongs to Zetex's legacy medium-power BJT family, engineered for high-gain, low-saturation switching in space-constrained industrial power stages and linear regulation circuits.

FAQ

Is ZTX1151A RoHS compliant?

Yes, ZTX1151A is RoHS compliant per Diodes Incorporated's product change notice PCN-2015-003, with lead-free matte tin plating on leads and halogen-free molding compound. Compliance is verified per JEDEC J-STD-609 and IEC 61249-2-21 standards.

What is the maximum safe operating area (SOA) at 100°C ambient?

At T_amb = 100°C, the SOA curve shows maximum continuous I_C drops to approximately −1.2 A at V_CE = −2 V due to thermal derating; pulse operation up to −2.5 A is permitted for t_p ≤ 10 ms with duty cycle ≤ 10%.

Can ZTX1151A be used in avalanche mode?

No - ZTX1151A is not rated or characterized for repetitive avalanche operation. Its V_(BR)CEO test condition specifies I_C = −10 mA, and no energy-rated avalanche specs (E_AS) are provided in the datasheet or application notes.

Does ZTX1151A have a SPICE model available?

Yes, an official PSpice-compatible model is published in the original Zetex documentation (revision 12/12/96), including parameters for IS, BF, VAF, IKF, CJE, CJC, TF, and TR - validated for DC, AC, and transient simulation up to 100 MHz.