Toshiba Semiconductor and Storage 2SA1588-O,LF

Overview

2SA1588-O,LF from Toshiba Electronic Devices & Storage Corporation is a silicon PNP epitaxial transistor designed for audio frequency low-power amplifier, driver-stage amplifier, and switching applications. It features hFE(2) ≥25 at V_CE = −6 V, I_C = −400 mA; V_CEO = −30 V; P_C = 200 mW (on FR4); and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the 2SA1588-O,LF datasheet, 2SA1588-O,LF pinout, 2SA1588-O,LF application, or 2SA1588-O,LF equivalent, key selection criteria include its complementary pairing with 2SC4118, hFE linearity across operating current, low V_CE(sat) of −0.1 V (typ.), and SC-70 package suitability for space-constrained analog driver stages.

Technical Context

This PNP bipolar junction transistor uses Toshiba's PCT (Planar Complementary Transistor) process to achieve stable hFE linearity-critical for low-distortion audio amplification and precise current gain control in driver circuits. Its rated V_CEO = −30 V and I_C = −500 mA support medium-voltage, medium-current switching and linear amplification up to 200 MHz f_T.

The device is qualified to AEC-Q101 for stress-tested automotive use, with thermal derating defined for both T_j = 150°C (LF suffix) and 125°C (non-LF), and junction-to-ambient thermal resistance optimized for FR4 boards with specified copper pad layout.

Key Specifications

Pinout & Package

Package: SC-70 (JEITA), also designated 2-2E1A by Toshiba; ultra-small surface-mount plastic package (0.006 g typ.), compatible with standard reflow processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Compared with 2SA1588-O,LF, the 2SA1037AK-TL-E offers superior gain but reduced voltage headroom, while the MMBT2907ALT1G provides broader availability and lower cost but lacks automotive qualification and hFE linearity guarantees critical for precision driver stages.

Availability

2SA1588-O,LF is available at Aetrix Electronics and suitable for audio frequency amplifiers, automotive body electronics, and industrial sensor interfaces requiring stable component supply, long-lifecycle support, and AEC-Q101 compliance.

Supply support for 2SA1588-O,LF 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 automotive, industrial, and consumer reliability standards.

The 2SA1588-O,LF belongs to Toshiba's legacy PCT-process PNP transistor family, engineered specifically for high-linearity analog amplification and robust switching in space-constrained, thermally demanding environments.

FAQ

What does the "O" suffix indicate in 2SA1588-O,LF?

The "O" suffix in 2SA1588-O,LF denotes the hFE(1) classification grade: 70–140 at V_CE = −1 V, I_C = −100 mA. This binning ensures predictable gain behavior for circuit design and matching with complementary NPN devices like 2SC4118. The "LF" indicates lead-free plating per RoHS requirements and corresponds to the 150°C junction temperature rating.

Is 2SA1588-O,LF pin-compatible with other SC-70 PNP transistors?

No-pin compatibility cannot be assumed solely from shared SC-70 packaging. The 2SA1588-O,LF has E-B-C pin order (Emitter–Base–Collector) as confirmed in Toshiba's 2-2E1A mechanical drawing. Always verify pinout against the specific device's datasheet; mismatched orientation risks circuit damage during assembly or operation.

How does AEC-Q101 qualification impact the use of 2SA1588-O,LF in automotive designs?

AEC-Q101 qualification means 2SA1588-O,LF has passed accelerated stress tests including temperature cycling, humidity bias, and mechanical shock-validating its suitability for non-safety-critical automotive applications such as door modules, HVAC controls, and lighting drivers. It does not imply functional safety certification (e.g., ISO 26262 ASIL).

What is the maximum allowable ambient temperature for continuous operation of 2SA1588-O,LF?

At full rated power (200 mW), the maximum ambient temperature for 2SA1588-O,LF is approximately 75°C when mounted on the specified FR4 board (25.4 × 25.4 × 1.6 mm, 0.5 mm² × 3 Cu pads). Derating curves in the datasheet show linear reduction above this point, reaching zero dissipation at 150°C ambient-consistent with its T_j(max) = 150°C rating.

Can 2SA1588-O,LF replace 2SA1588 in existing designs?

Yes-2SA1588-O,LF is a direct replacement for the legacy 2SA1588, retaining identical electrical specifications, pinout, and package. The "LF" suffix only indicates lead-free termination and updated environmental compliance; all performance parameters-including hFE classification "O", V_CEO, and P_C-are unchanged from the original part.