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

onsemi 2SB1508R

Name: 2SB1508R
Brand: onsemi
SKU: 2SB1508R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SB1508R

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-3P-3 Full Pack

Datasheet:: 2SB1508R.pdf

Description:: TRANS PNP 50V 12A TO-3PML

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SB1508R from SANYO Semiconductor is a PNP epitaxial planar silicon transistor designed for high-current switching applications, with V_CEO = −50 V, I_C = −12 A, P_C = 45 W at T_c = 25°C, V_CE(sat) ≤ −0.5 V at I_C = −6 A / I_B = −0.3 A, and f_T = 10 MHz - used in relay drivers and high-speed inverters.

For engineers reviewing the 2SB1508R datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed V_CE(sat) at high current, TO-3PML package thermal performance, ASO robustness, h_FE classification (Rank Q/R/S), and pulse rating compliance (I_CP = −25 A).

Technical Context

The 2SB1508R operates as a high-power PNP switching transistor with fully specified DC and pulsed ratings: −50 V V_CEO, −12 A continuous collector current, and −25 A single-pulse capability. Its low saturation voltage (≤ −0.5 V) enables efficient power switching in saturated-mode circuits.

It features a wide Active Safe Operating Area (ASO), confirmed by SOA curves covering 10 µs to 100 ms pulses, and exhibits stable h_FE across I_C = −1 A to −5 A (70–280 and 30 min, respectively). The device uses micaless TO-3PML packaging for direct heatsink mounting without insulating washers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V: Maximum allowable collector-emitter voltage under open-base condition; defines blocking capability in switching circuits.
I_C	−12 A: Continuous DC collector current at T_c = 25°C; sets steady-state power handling limit.
P_C	45 W at T_c = 25°C: Thermal dissipation capacity with case-mounted heatsink; determines minimum heatsink requirement.
V_CE(sat)	≤ −0.5 V at I_C = −6 A / I_B = −0.3 A: Confirmed low conduction loss enabling <0.3 W switching loss at rated current.
f_T	10 MHz: Gain-bandwidth product indicating usable frequency range for small-signal amplification or fast switching control.
h_FE	70–280 at I_C = −1 A / V_CE = −2 V: Binned DC current gain supporting predictable base drive design across production lots.
t_on/t_f	0.1 µs / 0.5 µs: Verified turn-on and fall times under 5 A load; supports >1 MHz switching in hard-switched topologies.

Pinout & Package

2SB1508R uses the SANYO TO-3PML package: metal tab (collector) electrically connected to Pin 2, with insulated base/emitter leads. Dimensions: 22.0 × 20.4 × 16.0 mm (L×W×H), micaless construction enables direct thermal interface to heatsink.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires −0.3 A base current to saturate at −6 A collector load per datasheet test condition.
2	Collector	Main power terminal; electrically tied to metal tab; must be isolated from heatsink unless system ground reference permits.
3	Emitter	Power return path; connects to high-side rail in PNP high-side switch configurations.

Key Features

Feature	Design Value
Low V_CE(sat)	≤ −0.5 V at −6 A ensures <3% conduction loss vs. supply rail in 12 V relay driver stages.
Wide ASO	SOA validated up to 100 ms pulse width supports surge-tolerant operation in motor commutation and inverter leg protection.
Micaless TO-3PML	Eliminates insulator washer requirement; reduces thermal resistance by ~0.5°C/W vs. standard TO-3P in identical mounting conditions.
h_FE binning	Three gain ranks (Q/R/S) enable precise base resistor selection for consistent saturation across production batches.

Applications

Relay Drivers	High-Speed Inverters
Use Scenario: Driving 24 V/10 A electromagnetic relays in industrial PLC output modules with 100 kHz PWM control. IC Role / Device Role / Timing Role: High-current PNP switch providing low-loss, high-gain saturation to energize relay coils rapidly. Use Value: V_CE(sat) ≤ −0.5 V minimizes coil heating and enables 95% duty-cycle operation without thermal derating.	Use Scenario: Upper-leg switching in 48 V DC-AC half-bridge inverters for UPS systems operating at 20–50 kHz. IC Role / Device Role / Timing Role: High-current PNP power switch handling bidirectional current during dead-time transitions. Use Value: Wide ASO and 25 A pulse rating withstand short-circuit events and inductive kickback during fault conditions.
DC-DC Converters	Motor Commutation
Use Scenario: Primary-side switch in 12 V input, 200 W forward converter with synchronous rectification. IC Role / Device Role / Timing Role: Main power switch controlling energy transfer during ON-time with minimal conduction loss. Use Value: 45 W case dissipation rating allows full-load operation with passive heatsinking in compact enclosures.	Use Scenario: Brushed DC motor H-bridge high-side switch in automotive seat adjusters requiring 15 A peak current. IC Role / Device Role / Timing Role: High-current PNP switch enabling bidirectional motor control via complementary NPN/PNP pairing (e.g., with 2SD2281). Use Value: Matched h_FE binning and complementary specs ensure balanced switching timing and reduced shoot-through risk.

Relay Drivers

High-Speed Inverters

Use Scenario: Driving 24 V/10 A electromagnetic relays in industrial PLC output modules with 100 kHz PWM control.

IC Role / Device Role / Timing Role: High-current PNP switch providing low-loss, high-gain saturation to energize relay coils rapidly.

Use Value: V_CE(sat) ≤ −0.5 V minimizes coil heating and enables 95% duty-cycle operation without thermal derating.

Use Scenario: Upper-leg switching in 48 V DC-AC half-bridge inverters for UPS systems operating at 20–50 kHz.

IC Role / Device Role / Timing Role: High-current PNP power switch handling bidirectional current during dead-time transitions.

Use Value: Wide ASO and 25 A pulse rating withstand short-circuit events and inductive kickback during fault conditions.

DC-DC Converters

Motor Commutation

Use Scenario: Primary-side switch in 12 V input, 200 W forward converter with synchronous rectification.

IC Role / Device Role / Timing Role: Main power switch controlling energy transfer during ON-time with minimal conduction loss.

Use Value: 45 W case dissipation rating allows full-load operation with passive heatsinking in compact enclosures.

Use Scenario: Brushed DC motor H-bridge high-side switch in automotive seat adjusters requiring 15 A peak current.

IC Role / Device Role / Timing Role: High-current PNP switch enabling bidirectional motor control via complementary NPN/PNP pairing (e.g., with 2SD2281).

Use Value: Matched h_FE binning and complementary specs ensure balanced switching timing and reduced shoot-through risk.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SB1219	V_CEO = −40 V, I_C = −10 A, V_CE(sat) ≤ −0.6 V at −5 A - lower voltage/current rating.	Suitable only for ≤40 V systems with <10 A loads; not recommended for 48 V inverters or 24 V/10 A relays.	Select when cost sensitivity outweighs margin requirements and system voltage remains below 36 V.
MJD44H11T4	V_CEO = −80 V, I_C = −8 A, V_CE(sat) ≤ −0.5 V at −4 A - higher voltage, lower current, TO-220F package.	Requires PCB-mount heatsinking; lacks micaless TO-3PML mechanical robustness for chassis-mounted designs.	Prefer for space-constrained PCBs where 80 V blocking is mandatory and peak current stays ≤8 A.

Compared with 2SB1508R, 2SB1219 offers lower cost but sacrifices 10 V blocking and 2 A current headroom, while MJD44H11T4 trades package ruggedness and thermal interface simplicity for higher voltage rating and surface-mount compatibility.

Availability

2SB1508R is available at Aetrix Electronics and suitable for relay drivers, high-speed inverters, and DC-DC converters requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial control and power electronics programs.

Supply support for 2SB1508R 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 Semiconductor was a Japanese semiconductor manufacturer specializing in power discrete devices, analog ICs, and optoelectronics before its acquisition by ON Semiconductor in 2011.

The 2SB1508R belongs to SANYO's high-current PNP transistor family engineered for industrial switching applications demanding robust SOA, low saturation voltage, and micaless thermal packaging.

FAQ

What is the maximum continuous collector current rating for the 2SB1508R?

The 2SB1508R has a maximum continuous collector current (I_C) of −12 A at case temperature T_c = 25°C. This rating assumes proper heatsinking per the TO-3PML package thermal profile. Derating is required above 25°C case temperature, with linear reduction to zero at 150°C junction temperature. The 2SB1508R datasheet specifies this value in the Absolute Maximum Ratings table under "Collector Current".

Does the 2SB1508R have a built-in base-emitter resistor?

No, the 2SB1508R is a standard bipolar junction transistor without any integrated base-emitter resistors. It requires external base drive circuitry - typically a current-limiting resistor or active driver - to establish the required I_B for saturation. This is confirmed by the absence of "R_BE" or "built-in resistor" in all electrical characteristics and feature descriptions for the 2SB1508R.

What does the "R" suffix in 2SB1508R indicate?

The "R" suffix in 2SB1508R denotes a specific gain bin (h_FE) ranking per SANYO's internal classification: Rank R corresponds to h_FE = 100–200 at I_C = −1 A and V_CE = −2 V. This binning enables predictable base drive design and consistent saturation behavior across production lots of the 2SB1508R.

Can the 2SB1508R be used in parallel with other transistors for higher current handling?

Parallel operation of the 2SB1508R is not recommended without individual emitter resistors and matched h_FE bins due to negative temperature coefficient of V_CE(sat), which can cause current hogging. The 2SB1508R datasheet does not specify derating or matching guidelines for paralleling, and its SOA curves assume single-device operation. For >12 A applications, use a higher-rated device instead.

Is the 2SB1508R RoHS compliant?

The original 2SB1508R was manufactured prior to RoHS enforcement deadlines and is not RoHS compliant. SANYO's documentation (EN3714A, dated December 2006) predates EU RoHS Directive 2002/95/EC compliance requirements. No lead-free or halogen-free variant of the 2SB1508R was released by SANYO or ON Semiconductor post-acquisition.

2SB1508R Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-3P-3 Full Pack

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 12 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 300mA, 6A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 1A, 2V

Power - Max:: 3 W

Frequency - Transition:: 10MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3PML

2SB1508R FAQ

1.How can I place an order for 2SB1508R through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SB1508R 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 2SB1508R reliable?

The price and inventory of 2SB1508R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SB1508R is usually 5 days.

3.What payment methods are accepted for 2SB1508R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SB1508R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SB1508R?

2SB1508R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SB1508R 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 2SB1508R?

For technical support, including 2SB1508R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SB1508R requirements.

6.How does Aetrix verify that 2SB1508R is sourced from the original manufacturer or authorized distributors?

All 2SB1508R 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 2SB1508R meets industry standards.

7.What is the process for return or replacement of 2SB1508R?

All 2SB1508R units undergo pre-shipment inspection (PSI). If there is an issue with 2SB1508R, 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 2SB1508R part is unused and in its original packaging.

Return procedure for 2SB1508R:

1.Submit a request within 90 days.

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

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