onsemi 2SA1540E

Overview

2SA1540E from SANYO is a PNP epitaxial planar silicon transistor designed for high-frequency video output stages in high-definition CRT displays, featuring f_T = 300 MHz, V_CEO = −200 V (min), and C_re = 1.5 pF at V_CB = −30 V, 1 MHz.

For engineers reviewing the 2SA1540E datasheet, pinout, applications, or equivalent options, this device is selected for wide-band amplifier designs requiring high breakdown voltage, low reverse transfer capacitance, and stable gain in analog video signal paths.

Technical Context

The 2SA1540E operates as a complementary PNP counterpart to the 2SC3955 NPN transistor, sharing the TO-126ML plastic package and FBET process technology. It supports DC and pulsed operation up to I_C = −100 mA (continuous) and I_CP = −200 mA (1 ms pulse), with V_CE(sat) ≤ −1.0 V at I_C/I_B = 10.

Its high f_T and low C_re enable stable wideband amplification up to ~100 MHz in video output circuits. The device exhibits h_FE = 20–40 at I_C = −10 mA, V_CE = −10 V, and maintains V_CEO ≥ −200 V under rated conditions.

Key Specifications

Pinout & Package

SANYO TO-126ML plastic package (micaless), 3-terminal through-hole mount. Dimensions per No.2439-2/4: 11.0 × 9.0 × 4.0 mm (L × W × H), lead pitch 2.54 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SA1540E, the 2SA1774 trades 50 MHz bandwidth for +50 V breakdown headroom, while the MJD2955G sacrifices both voltage rating and high-frequency performance for higher power handling in non-video applications.

Availability

2SA1540E is available at Aetrix Electronics and suitable for high-definition CRT display video output, wideband analog amplifier, and high-voltage pulse driver applications requiring stable component supply and long-lifecycle support.

Supply support for 2SA1540E 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

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer specializing in analog, power, and display-related components before its acquisition by Panasonic in 2011.

The 2SA1540E belongs to SANYO's high-frequency bipolar transistor product line, engineered specifically for analog video signal integrity in CRT-based display systems requiring simultaneous high voltage, high speed, and thermal reliability.

FAQ

What is the maximum continuous collector current rating for the 2SA1540E?

The 2SA1540E has a maximum continuous collector current I_C of −100 mA at T_c = 25°C. This rating assumes proper heatsinking or ambient thermal management; derating applies above 25°C case temperature per the PC–Ta curve in the datasheet. The 2SA1540E must not be operated beyond this limit to ensure long-term reliability.

Does the 2SA1540E support complementary operation with the 2SC3955?

Yes, the 2SA1540E is explicitly designed as the PNP complement to the 2SC3955 NPN transistor. Both share identical TO-126ML packaging, matched f_T (300 MHz), V_CEO/V_CEO ratings (−200 V/+200 V), and FBET process characteristics, enabling direct use in symmetrical push-pull video output stages without gain or thermal mismatch concerns.

What is the typical reverse transfer capacitance (C_re) of the 2SA1540E and why does it matter?

The 2SA1540E exhibits C_re = 1.5 pF at V_CB = −30 V, f = 1 MHz. This low value minimizes Miller effect in high-gain, high-frequency amplifier configurations-critical for preserving bandwidth and preventing oscillation in CRT video output stages where stability above 20 MHz is required.

Can the 2SA1540E be used in modern LCD or OLED display applications?

The 2SA1540E was engineered for CRT-specific high-voltage, high-bandwidth analog video output and is not optimized for low-voltage digital interface or switching applications found in LCD/OLED systems. Its −200 V rating, 300 MHz f_T, and TO-126ML package make it unsuitable for typical 3.3 V/5 V logic-level display drivers; newer MOSFET or integrated video buffers are preferred.

Is the 2SA1540E RoHS compliant?

The original 2SA1540E was manufactured prior to RoHS enforcement (pre-2006) and contains lead in solder and die attach materials. No RoHS-compliant reflow or halogen-free variant was released by SANYO. For new designs requiring compliance, alternative modern PNP RF transistors with documented RoHS status should be evaluated instead of the 2SA1540E.