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 2SA1481E-AC

Name: 2SA1481E-AC
Brand: onsemi
SKU: 2SA1481E-AC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2SA1481E-AC

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: -

Datasheet:: 2SA1481E-AC.pdf

Description:: BIP PNP 0.15A 50V

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:45,000

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

Product details

Overview

2SA1481E-AC from SANYO is a PNP epitaxial planar silicon transistor designed for high-speed switching applications, featuring V_CEO = –50 V, I_C = –150 mA, h_FE = 100–200 at I_C = –1 mA, f_T = 100 MHz, and ultra-fast switching times (t_d = 40 ns, t_f = 25 ns). It serves as a compact, low-power switching element in DC-DC converter control stages and pulse generator output drivers.

For engineers reviewing the 2SA1481E-AC datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, terminal mapping, real-world use cases, and validated alternative transistors for discrete power switching design.

Technical Context

The 2SA1481E-AC operates as a single PNP bipolar junction transistor with epitaxial planar construction, optimized for fast turn-on/turn-off in saturated-switching mode. Its base-emitter and collector-base junctions are engineered for low saturation voltage (V_CE(sat) ≤ –0.5 V at I_C = –100 mA, I_B = –10 mA) and minimal storage time (t_s = 200 ns).

It is rated for continuous operation up to T_j = +150 °C and supports pulsed collector current up to –400 mA. The device exhibits stable h_FE across –25 °C to +75 °C and maintains Cob = 4.0 pF at V_CB = –6 V, enabling predictable high-frequency behavior in oscillator and timing circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–50 V: Maximum collector-emitter voltage before breakdown under open-base condition; defines safe operating range in flyback and inductive load switching.
I_C (max)	–150 mA: Continuous DC collector current rating; sets upper limit for steady-state load drive capability.
h_FE	100–200 at I_C = –1 mA: DC current gain range used to size base drive resistors for reliable saturation in logic-level interfacing.
f_T	100 MHz: Gain-bandwidth product indicating usable frequency limit for small-signal amplification or RF switching above audio band.
t_f	25 ns: Fall time measured under standardized test conditions (V_CC = –20 V, I_C = –10 mA); critical for minimizing switching losses in PWM circuits.
P_C	250 mW: Maximum collector dissipation at T_a = 25 °C; determines thermal derating requirements on PCB without heatsink.
V_CE(sat)	≤ –0.5 V at I_C = –100 mA, I_B = –10 mA: Low saturation voltage reduces conduction loss in high-duty-cycle switching applications.

Pinout & Package

2SA1481E-AC is housed in the TO-92 (SPA) package - a 3-lead through-hole plastic case with standard lead spacing and JEDEC-compliant dimensions (max height 4.6 mm, body diameter 3.3 mm). Pin identification is fixed: Lead 1 = Emitter, Lead 2 = Collector, Lead 3 = Base.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for PNP device	Connected to higher-potential rail (e.g., V_CC) in common-emitter switch configuration; polarity reversal required vs NPN.
2 (Collector)	Current entry path for PNP device	Typically tied to load and ground return; reverse-biased during off-state to sustain V_CEO rating.
3 (Base)	Control electrode for minority-carrier injection	Receives negative current to forward-bias B-E junction; requires current-limiting resistor to ensure I_B ≥ I_C/h_FE(min).

Key Features

Feature	Design Value
Fast switching speed	t_d = 40 ns, t_r = 30 ns, t_f = 25 ns - enables >1 MHz switching in low-power SMPS and pulse generators.
High breakdown voltage	V_CEO = –50 V and V_CB0 = –60 V - supports operation in 24 V and 48 V industrial bus systems with margin.
Low saturation voltage	V_CE(sat) ≤ –0.5 V at I_C = –100 mA - minimizes power loss and self-heating in battery-powered portable devices.
Stable h_FE over temperature	h_FE remains within 100–200 range from –25 °C to +75 °C - simplifies base drive design without thermal compensation.
Low output capacitance	C_ob = 4.0 pF at V_CB = –6 V - reduces Miller effect and improves high-frequency response in amplifier stages.

Applications

DC-DC Converter Driver	LED Pulse Modulator
Use Scenario: Driving gate of N-channel MOSFET in non-isolated buck converter feedback loop. IC Role / Device Role / Timing Role: PNP switch controlling pull-up path to MOSFET gate; provides fast turn-off by actively discharging gate capacitance. Use Value: t_f = 25 ns ensures <100 ns total gate discharge time, supporting 500 kHz+ switching frequencies without shoot-through risk.	Use Scenario: High-repetition-rate LED strobe in machine vision lighting systems. IC Role / Device Role / Timing Role: Current sink switch modulating LED anode supply via common-cathode topology. Use Value: V_CEO = –50 V allows direct interface with 24 V industrial LED strings; low V_CE(sat) keeps LED forward voltage drop stable.
Logic-Level Signal Inverter	Relay Coil Driver
Use Scenario: Converting 3.3 V CMOS logic output to inverted 5 V TTL-compatible signal. IC Role / Device Role / Timing Role: Saturated PNP inverter stage with emitter-follower input buffering and collector-open output. Use Value: h_FE ≥ 100 guarantees full saturation with ≤100 µA base drive, compatible with low-drive MCU GPIOs.	Use Scenario: Driving 12 V/40 mA electromagnetic relay coil in PLC I/O module. IC Role / Device Role / Timing Role: Low-side switch sinking relay coil current to ground when base is pulled low. Use Value: I_C = –150 mA rating exceeds relay hold current by >2×, ensuring long-term reliability under surge conditions.

DC-DC Converter Driver

LED Pulse Modulator

Use Scenario: Driving gate of N-channel MOSFET in non-isolated buck converter feedback loop.

IC Role / Device Role / Timing Role: PNP switch controlling pull-up path to MOSFET gate; provides fast turn-off by actively discharging gate capacitance.

Use Value: t_f = 25 ns ensures <100 ns total gate discharge time, supporting 500 kHz+ switching frequencies without shoot-through risk.

Use Scenario: High-repetition-rate LED strobe in machine vision lighting systems.

IC Role / Device Role / Timing Role: Current sink switch modulating LED anode supply via common-cathode topology.

Use Value: V_CEO = –50 V allows direct interface with 24 V industrial LED strings; low V_CE(sat) keeps LED forward voltage drop stable.

Logic-Level Signal Inverter

Relay Coil Driver

Use Scenario: Converting 3.3 V CMOS logic output to inverted 5 V TTL-compatible signal.

IC Role / Device Role / Timing Role: Saturated PNP inverter stage with emitter-follower input buffering and collector-open output.

Use Value: h_FE ≥ 100 guarantees full saturation with ≤100 µA base drive, compatible with low-drive MCU GPIOs.

Use Scenario: Driving 12 V/40 mA electromagnetic relay coil in PLC I/O module.

IC Role / Device Role / Timing Role: Low-side switch sinking relay coil current to ground when base is pulled low.

Use Value: I_C = –150 mA rating exceeds relay hold current by >2×, ensuring long-term reliability under surge conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1037AK-TL-E	Higher h_FE (200–400), lower V_CEO (–50 V same), identical TO-92 package and pinout.	Suitable for low-base-drive designs but less tolerant of V_CB transients due to lower V_CBO (–60 V → –50 V).	Select when base current budget is constrained and circuit lacks clamping; verify V_CB stress in inductive loads.
BC807-40-7-F	SMD SOT-23 package, V_CEO = –45 V, h_FE = 250–630, f_T = 100 MHz - same speed, smaller footprint.	Requires PCB redesign for surface-mount assembly; not drop-in compatible with through-hole layouts using 2SA1481E-AC.	Choose for space-constrained consumer electronics where automated assembly and miniaturization outweigh through-hole serviceability.

Compared with 2SA1481E-AC, the 2SA1037AK-TL-E offers higher gain but reduced voltage margin, while the BC807-40-7-F delivers identical performance in a compact SMT form-neither is pin-compatible, requiring layout or drive circuit review for substitution.

Availability

2SA1481E-AC is available at Aetrix Electronics and suitable for DC-DC converter driver, LED pulse modulator, and logic-level signal inverter applications requiring stable component supply, consistent parametric binning, and long-term industrial availability.

Supply support for 2SA1481E-AC 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-performance analog and discrete devices before its acquisition by Panasonic in 2012; its legacy transistor lines remain widely deployed in industrial and automotive systems.

The 2SA1481E-AC belongs to SANYO's general-purpose high-speed PNP transistor family, developed specifically for cost-sensitive, medium-frequency switching tasks in power management and signal conditioning circuits.

FAQ

What is the maximum junction temperature rating for the 2SA1481E-AC?

The 2SA1481E-AC has a maximum junction temperature (T_j) rating of +150 °C, as specified in its Absolute Maximum Ratings table. This allows reliable operation in enclosed industrial enclosures or near heat-generating components, provided PCB copper area and ambient conditions maintain junction temperature below this limit. Derating curves in the datasheet show allowable power dissipation decreases linearly above +25 °C ambient.

Does the 2SA1481E-AC have a documented h_FE binning code for the 'E-AC' suffix?

Yes - the 'E-AC' suffix on 2SA1481E-AC denotes the h_FE range of 100–200 at I_C = –1 mA, per SANYO's classification system shown in the datasheet's "h_FE Classification" table. This bin ensures predictable base drive requirements and eliminates need for post-manufacturing h_FE screening in production.

Can the 2SA1481E-AC be used in linear amplifier configurations?

The 2SA1481E-AC is characterized and optimized for saturated switching, not linear amplification. While it exhibits f_T = 100 MHz and usable h_FE, its SOA (Safe Operating Area) and linearity metrics (e.g., distortion, gain flatness) are not specified. For linear applications, SANYO's 2SA1182 or complementary 2SC2960 pair are better suited per their published small-signal AC characteristics.

What is the typical Cob value of the 2SA1481E-AC and how does it affect high-frequency performance?

The 2SA1481E-AC has a typical output capacitance (C_ob) of 4.0 pF at V_CB = –6 V and f = 1 MHz. This low value limits Miller capacitance in common-emitter switches, enabling clean edge transitions and reducing susceptibility to parasitic oscillation - especially beneficial in >1 MHz clock buffer and pulse shaping circuits.

Is the 2SA1481E-AC RoHS compliant and what is its lead finish?

The 2SA1481E-AC was manufactured prior to RoHS enforcement (pre-2006) and carries a lead (Pb)-containing solder finish per SANYO's historical process. It is not RoHS-compliant; however, Panasonic (which absorbed SANYO's semiconductor business) lists no Pb-free requalification for this specific part number. For new designs, consider RoHS alternatives like BC807-40-7-F or MMBT2907ALT1G.

2SA1481E-AC Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Transistor Type:: -

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

Voltage - Collector Emitter Breakdown (Max):: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

2SA1481E-AC FAQ

1.How can I place an order for 2SA1481E-AC through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1481E-AC 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 2SA1481E-AC reliable?

The price and inventory of 2SA1481E-AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1481E-AC is usually 5 days.

3.What payment methods are accepted for 2SA1481E-AC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1481E-AC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1481E-AC?

2SA1481E-AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1481E-AC 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 2SA1481E-AC?

For technical support, including 2SA1481E-AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1481E-AC requirements.

6.How does Aetrix verify that 2SA1481E-AC is sourced from the original manufacturer or authorized distributors?

All 2SA1481E-AC 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 2SA1481E-AC meets industry standards.

7.What is the process for return or replacement of 2SA1481E-AC?

All 2SA1481E-AC units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1481E-AC, 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 2SA1481E-AC part is unused and in its original packaging.

Return procedure for 2SA1481E-AC:

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…