Toshiba Semiconductor and Storage TTA004B,Q

Overview

TTA004B from Toshiba is a silicon PNP epitaxial bipolar transistor designed for high-voltage audio-frequency amplification, featuring VCEO = −160 V (min), fT = 100 MHz (typ.), and Cob = 17 pF (typ.). It operates in linear mode with hFE = 80–280 at IC = −1 mA to −0.1 A and supports DC collector current up to −1.5 A in TO-126N package.

For engineers reviewing the TTA004B datasheet, TTA004B pinout, TTA004B application, or TTA004B equivalent, this device is selected for high-voltage analog gain stages where low output capacitance, stable DC current gain, and robust safe operating area are critical - especially in discrete audio power amplifier output stages and high-side switching regulators.

Technical Context

The TTA004B is a complementary PNP counterpart to the TTC004B NPN transistor, enabling matched push-pull configurations in Class AB audio amplifiers. Its −160 V VCEO rating and −1.5 A IC rating support operation in high-swing, medium-power linear circuits without secondary breakdown concerns under specified thermal conditions.

Dynamic performance is defined by fT = 100 MHz (at VCE = −10 V, IC = −100 mA) and Cob = 17 pF (at VCB = −10 V), indicating suitability for wideband audio and RF pre-driver applications up to ~30 MHz. Junction temperature must be limited to 150 °C per absolute maximum ratings, with derating required above Ta = 25 °C.

Key Specifications

Pinout & Package

TTA004B is housed in a TO-126N (TOSHIBA 2-8U1A) plastic power package with exposed collector tab for thermal mounting. The case is electrically connected to the collector terminal and requires isolation from heatsink unless circuit design permits direct connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP bipolar transistor applications.

Compared with MJD44H11 and BD139, the TTA004B delivers superior high-voltage headroom and lower output capacitance - critical for stable, low-distortion operation in ±120 V audio and precision HV linear circuits - while maintaining compatible DC drive and thermal footprint.

Availability

TTA004B is available at Aetrix Electronics and suitable for audio-frequency amplifiers, high-voltage linear regulators, discrete RF drivers, and industrial HV switching control requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for TTA004B 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs with emphasis on reliability, thermal performance, and application-specific optimization.

The TTA004B belongs to Toshiba's legacy high-voltage bipolar transistor family, engineered for discrete analog signal conditioning and power control in industrial and professional audio systems.

FAQ

What is the maximum safe collector-emitter voltage for TTA004B?

The TTA004B has a guaranteed minimum collector-emitter breakdown voltage of −160 V under DC conditions (IC = −10 mA, IB = 0 A). Operation beyond this value risks avalanche breakdown and permanent damage. Derating is recommended for pulsed or thermally stressed conditions, and junction temperature must remain ≤150 °C per datasheet limits.

Is TTA004B pin-compatible with TTC004B?

No - TTA004B (PNP) and TTC004B (NPN) share identical TO-126N packaging and pinout (Emitter–Collector–Base), but they are complementary devices, not pin-compatible replacements. Their electrical polarities differ, so direct substitution would reverse bias conditions and cause circuit failure.

Can TTA004B be used in switching applications?

Yes - the TTA004B supports saturated switching with VCE(sat) ≤ −0.5 V at IC = −0.5 A / IB = −50 mA and exhibits fast turn-off due to low Cob = 17 pF. However, its SOA curve limits safe switching energy at high voltage/current combinations; SPICE modeling or empirical testing is advised for hard-switching topologies.

What is the thermal resistance of TTA004B?

The TTA004B datasheet specifies rth(j-a) = 83.3 °C/W (typ.) for free-air operation and rth(j-c) = 10 °C/W (guaranteed max) when mounted on a large copper pad. Actual thermal performance depends on PCB copper area, heatsink interface, and airflow; refer to Fig. 7.7 for transient thermal impedance curves.

Does TTA004B meet RoHS requirements?

Yes - the TTA004B is marked [[G]]/RoHS COMPATIBLE per Toshiba documentation, confirming compliance with Directive 2011/65/EU. Lead-free soldering profiles must follow JEDEC J-STD-020 guidelines; reflow peak temperature should not exceed 260 °C for ≤10 seconds.