Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi 2SA1208T

Name: 2SA1208T
Brand: onsemi
SKU: 2SA1208T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2SA1208T

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: 2SA1208T.pdf

Description:: TRANS PNP 160V 0.07A 3-MP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:13,199

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

2SA1208T from SANYO is a PNP epitaxial planar silicon transistor designed for high-voltage switching and audio 80W output predriver applications. It features V_CEO = −160 V, I_C = −700 mA, P_C = 900 mW, f_T = 150 MHz, and h_FE = 100–400 at I_C = −10 mA, enabling robust performance in high-gain, fast-switching amplifier stages.

For engineers reviewing the 2SA1208T datasheet, pinout, applications, or equivalent options, key selection criteria include its −160 V collector-emitter breakdown voltage, low V_CE(sat) of −1.0 V at I_C/I_B = 10, fast t_ON/t_OFF (1.0 µs / 2.0 µs), and FBET process-derived linearity for audio predriver fidelity.

Technical Context

The 2SA1208T operates as a complementary PNP counterpart to the NPN 2SC2910 in push-pull audio output stages. Its FBET (Flat Base Epitaxial Transistor) process ensures tight h_FE distribution (100–400), low C_ob (2.5 pF at V_CB = −10 V), and excellent linearity across temperature (−25°C to +75°C).

Designed for DC-coupled or transformer-coupled predriver use, it delivers stable gain-bandwidth performance (f_T = 150 MHz at V_CE = −10 V, I_C = −10 mA) with minimal V_BE(sat) drift (−0.85 V typical at I_C/I_B = 10) and low thermal resistance (R_θJA ≈ 139°C/W).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−160 V: Enables safe operation in high-voltage audio supply rails up to ±80 V without breakdown.
I_C (max)	−700 mA: Supports peak predriver current for 80W Class-AB amplifier stages.
P_C	900 mW: Sustains continuous dissipation in TO-92MOD package with derating above 25°C.
f_T	150 MHz: Ensures wide bandwidth for full-audio-spectrum signal integrity and low distortion.
h_FE	100–400 at I_C = −10 mA: Provides predictable DC bias stability and gain control in feedback networks.
V_CE(sat)	−1.0 V max at I_C/I_B = 10: Minimizes voltage drop and power loss in saturated switching mode.
C_ob	2.5 pF at V_CB = −10 V: Reduces Miller effect and improves high-frequency stability in common-emitter configurations.

Pinout & Package

2SA1208T uses the TO-92MOD (MP) plastic package with 3-pin straight lead configuration. Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - verified per SANYO No.781-2/4 mechanical drawing and switching test circuit diagrams.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or negative rail in common-emitter predriver stage; polarity defines PNP conduction direction.
2 (Collector)	High-voltage output node	Drives base of output transistor pair; rated for −160 V standoff and −700 mA pulsed current.
3 (Base)	Control input	Receives drive current from preceding stage; requires precise I_B calculation due to h_FE spread (100–400).

Key Features

Feature	Design Value
FBET process technology	Delivers tight h_FE distribution and reduced C_ob variation for consistent gain matching in dual-transistor designs.
High V_CEO rating	−160 V supports direct interface with high-voltage audio rails without external clamping or level-shifting.
Fast switching speed	t_ON = 1.0 µs / t_OFF = 2.0 µs enables clean square-wave response in PWM-driven predriver circuits.
Low saturation voltage	V_CE(sat) ≤ −1.0 V at I_C/I_B = 10 minimizes power loss and thermal stress during conduction.
Temperature-stable h_FE	h_FE maintains ≥80% of room-temp value from −25°C to +75°C, ensuring bias stability across operating range.

Applications

Audio Power Amplifier Predriver	High-Voltage Switching Regulator
Use Scenario: Driving the bases of complementary output transistors in discrete 80W Class-AB audio amplifiers. IC Role / Device Role / Timing Role: PNP predriver transistor providing inverted, high-current, high-voltage gain stage before final output devices. Use Value: Delivers linear gain (h_FE = 100–400) and fast transient response (f_T = 150 MHz) to preserve audio fidelity and reduce crossover distortion.	Use Scenario: High-side switch in offline SMPS auxiliary supplies or flyback gate drivers. IC Role / Device Role / Timing Role: PNP switching transistor controlling primary-side bias winding or optocoupler LED current. Use Value: Withstands −160 V V_CEO and switches at <2 µs, enabling reliable operation in 100–240 VAC input topologies.
DC Motor Driver Stage	Industrial Signal Conditioning
Use Scenario: H-bridge upper-leg driver for 24–48 V brushed DC motors in automation equipment. IC Role / Device Role / Timing Role: High-voltage PNP switch sourcing current to motor winding via emitter-follower configuration. Use Value: Low V_CE(sat) (≤−1.0 V) reduces conduction loss, while FBET linearity ensures accurate current mirroring in feedback loops.	Use Scenario: Precision current source/sink in analog sensor front-ends or industrial 4–20 mA transmitter outputs. IC Role / Device Role / Timing Role: Linear-mode PNP transistor regulating load current with stable h_FE and low C_ob. Use Value: Tight h_FE spread (100–400) and low Cob (2.5 pF) enable accurate, broadband current control without oscillation.

Audio Power Amplifier Predriver

High-Voltage Switching Regulator

Use Scenario: Driving the bases of complementary output transistors in discrete 80W Class-AB audio amplifiers.

IC Role / Device Role / Timing Role: PNP predriver transistor providing inverted, high-current, high-voltage gain stage before final output devices.

Use Value: Delivers linear gain (h_FE = 100–400) and fast transient response (f_T = 150 MHz) to preserve audio fidelity and reduce crossover distortion.

Use Scenario: High-side switch in offline SMPS auxiliary supplies or flyback gate drivers.

IC Role / Device Role / Timing Role: PNP switching transistor controlling primary-side bias winding or optocoupler LED current.

Use Value: Withstands −160 V V_CEO and switches at <2 µs, enabling reliable operation in 100–240 VAC input topologies.

DC Motor Driver Stage

Industrial Signal Conditioning

Use Scenario: H-bridge upper-leg driver for 24–48 V brushed DC motors in automation equipment.

IC Role / Device Role / Timing Role: High-voltage PNP switch sourcing current to motor winding via emitter-follower configuration.

Use Value: Low V_CE(sat) (≤−1.0 V) reduces conduction loss, while FBET linearity ensures accurate current mirroring in feedback loops.

Use Scenario: Precision current source/sink in analog sensor front-ends or industrial 4–20 mA transmitter outputs.

IC Role / Device Role / Timing Role: Linear-mode PNP transistor regulating load current with stable h_FE and low C_ob.

Use Value: Tight h_FE spread (100–400) and low Cob (2.5 pF) enable accurate, broadband current control without oscillation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1020	V_CEO = −150 V (10 V lower), f_T = 120 MHz (30 MHz lower), h_FE = 60–240 (narrower range)	Suitable for ≤60W audio or lower-speed switching where margin on voltage/bandwidth is acceptable	Select when cost sensitivity outweighs need for 160 V rating or 150 MHz bandwidth
MJD2955G	TO-220 package (higher power), V_CEO = −70 V (90 V lower), I_C = −10 A (14× higher), P_C = 75 W	Used in high-current output stages-not predrivers-requiring heatsinking and PCB area	Choose only for replacement in high-power output positions, not as direct 2SA1208T functional substitute

Compared with 2SA1208T, the 2SA1020 offers lower cost but reduced voltage headroom and bandwidth, while the MJD2955G trades compactness and predriver linearity for raw current capacity-neither is pin-compatible, and both require layout and bias network changes.

Availability

2SA1208T is available at Aetrix Electronics and suitable for audio amplifier predriver circuits, high-voltage switching regulators, and industrial DC motor control systems requiring stable component supply and long-term obsolescence management.

Supply support for 2SA1208T 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 known for high-reliability discrete devices and analog ICs before its acquisition by Panasonic in 2012; its transistor product lines remain widely deployed in legacy industrial and audio systems.

The 2SA1208T belongs to SANYO's high-voltage PNP transistor family developed specifically for audio predriver and switching applications demanding high V_CEO, fast transition times, and FBET-derived linearity.

FAQ

What is the maximum collector-emitter voltage rating for the 2SA1208T?

The 2SA1208T has a maximum collector-emitter voltage rating (V_CEO) of −160 V at T_a = 25°C. This rating allows safe operation in high-voltage audio amplifier rails and offline power supply circuits. Exceeding this voltage-even momentarily-may cause irreversible device failure, as explicitly stated in SANYO's safety notice.

Is the 2SA1208T pin-compatible with the 2SC2910?

No, the 2SA1208T and 2SC2910 are complementary PNP/NPN devices with identical TO-92MOD (MP) package outlines and pin assignments (Emitter–Collector–Base), but opposite polarity and electrical characteristics. They are intended for matched-pair use in push-pull stages-not as interchangeable replacements. The 2SA1208T pinout remains E-C-B per SANYO No.781-2/4.

What is the typical DC current gain (h_FE) of the 2SA1208T at −10 mA collector current?

The 2SA1208T exhibits h_FE = 100–400 at V_CE = −5 V and I_C = −10 mA, as specified in SANYO's classification table. This wide gain range reflects intentional binning for matching with 2SC2910 in audio applications; design must accommodate this spread using emitter degeneration or feedback.

Does the 2SA1208T support operation at elevated ambient temperatures?

Yes-the 2SA1208T is rated for operation from −55°C to +150°C junction temperature, with storage temperature from −55°C to +150°C. Derating curves (PC vs. Ta) confirm usable dissipation up to +100°C ambient when mounted on standard PCB copper, making it suitable for enclosed industrial environments.

What is the small-signal gain-bandwidth product (f_T) of the 2SA1208T?

The 2SA1208T has a guaranteed minimum f_T of 150 MHz at V_CE = −10 V and I_C = −10 mA, as shown in the ITR03010 graph. This bandwidth supports full-audio-spectrum amplification with low phase shift, critical for low-distortion predriver performance in high-fidelity systems.

2SA1208T Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 70 mA

Voltage - Collector Emitter Breakdown (Max):: 160 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 3mA, 30mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 10mA, 5V

Power - Max:: 900 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-MP

2SA1208T FAQ

1.How can I place an order for 2SA1208T through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1208T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2SA1208T reliable?

The price and inventory of 2SA1208T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1208T is usually 5 days.

3.What payment methods are accepted for 2SA1208T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1208T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1208T?

2SA1208T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1208T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2SA1208T?

For technical support, including 2SA1208T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1208T requirements.

6.How does Aetrix verify that 2SA1208T is sourced from the original manufacturer or authorized distributors?

All 2SA1208T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2SA1208T meets industry standards.

7.What is the process for return or replacement of 2SA1208T?

All 2SA1208T units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1208T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2SA1208T part is unused and in its original packaging.

Return procedure for 2SA1208T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…