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

onsemi 2SB1144S

Name: 2SB1144S
Brand: onsemi
SKU: 2SB1144S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SB1144S

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: 2SB1144S.pdf

Description:: TRANS PNP 100V 1.5A TO-126ML

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SB1144S from SANYO is a PNP epitaxial planar silicon transistor designed for medium-power switching applications, featuring V_CEO = −100 V, I_C = −1.5 A, P_C = 1.5 W at T_C = 25 °C, and low saturation voltages V_CE(sat) ≤ −0.5 V (I_C = −500 mA, I_B = −50 mA). It is used in DC-DC converter output stages and relay drivers requiring robust breakdown voltage and thermal stability.

For engineers reviewing the 2SB1144S datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE classification (100–200), TO-126ML package thermal performance, switching time t_on/t_off ≤ 80/1000 ns, and safe operating area compliance up to 150 °C junction temperature.

Technical Context

The 2SB1144S operates as a single PNP bipolar junction transistor with emitter-base-collector terminal configuration. Its FBET/MBIT process enables high V_BR(CEO) and low V_CE(sat), supporting reliable turn-off in inductive load switching.

It is rated for continuous collector current of −1.5 A at T_C = 25 °C and supports pulsed operation up to −2.0 A. The device exhibits f_T ≥ 120 MHz at V_CE = −10 V, I_C = −50 mA, confirming suitability for high-speed switching below 100 kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V: Maximum allowable collector-emitter voltage before avalanche breakdown in open-base condition.
I_C	−1.5 A: Continuous DC collector current rating at case temperature 25 °C; derates linearly above 25 °C.
P_C	1.5 W: Total power dissipation capability at T_C = 25 °C; requires heatsinking for sustained operation.
V_CE(sat)	≤ −0.5 V @ I_C = −500 mA, I_B = −50 mA: Ensures minimal conduction loss in saturated switch mode.
h_FE	100–200 @ V_CE = −5 V, I_C = −100 mA: Guaranteed DC current gain range for predictable base drive sizing.
t_on/t_off	80/1000 ns: Switching times measured under standard test circuit; defines maximum usable frequency in hard-switched topologies.

Pinout & Package

2SB1144S is housed in the TO-126ML plastic package with integral heat sink tab, enabling surface-mount-compatible through-hole mounting and direct thermal coupling to PCB copper or external heatsink.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for PNP device	Connected to higher-potential rail in common-emitter switching; electrically tied to metal tab in TO-126ML.
2 (Collector)	Current entry path, main power terminal	Carries full load current; tab-connected for thermal conduction; must be isolated from other potentials if heatsink is grounded.
3 (Base)	Control input for minority-carrier injection	Receives negative base current to saturate; requires current-limiting resistor to prevent overdrive and secondary breakdown.

Key Features

Feature	Design Value
High breakdown voltage	V_CEO = −100 V ensures robustness against voltage transients in 48 V industrial bus and flyback snubber circuits.
Low saturation voltage	V_CE(sat) ≤ −0.5 V minimizes conduction loss and self-heating during on-state operation.
Plastic-covered heat sink	TO-126ML package integrates insulated metal tab for direct PCB thermal transfer without additional insulators.
FBET/MBIT process	Enables tight h_FE binning (100–200) and stable gain across temperature for consistent drive requirements.

Applications

DC-DC Converter Output Stage	Relay Driver Circuit
Use Scenario: High-side switching in non-isolated buck or flyback converters delivering up to 1.2 A at 24–48 V input. IC Role / Device Role / Timing Role: PNP switch controlling energy transfer to output inductor; operates in saturated on/off mode at 20–100 kHz. Use Value: V_CEO = −100 V provides 2× margin over 48 V bus, while low V_CE(sat) reduces thermal stress during continuous conduction mode.	Use Scenario: Driving 12 V/24 V electromagnetic relays with coil resistance 100–500 Ω in PLC I/O modules. IC Role / Device Role / Timing Role: Medium-current PNP switch providing fast turn-on/turn-off to eliminate contact bounce and reduce relay wear. Use Value: t_on/t_off ≤ 80/1000 ns ensures clean coil energization/de-energization; TO-126ML tab aids heat dissipation during repeated actuation.
Motor Brake Control	Power Supply Sequencing
Use Scenario: Dynamic braking of small DC motors (≤100 W) by shorting armature through PNP switch during deceleration. IC Role / Device Role / Timing Role: High-current sinking switch activated only during braking phase; handles peak currents up to −1.5 A. Use Value: P_C = 1.5 W and T_j(max) = 150 °C allow brief high-power dissipation without thermal shutdown in intermittent duty cycles.	Use Scenario: Enabling/disabling auxiliary rails (e.g., −5 V, −12 V) in multi-rail industrial power supplies with controlled ramp-up timing. IC Role / Device Role / Timing Role: Voltage-controlled enable switch placed between input and LDO or linear regulator input. Use Value: Guaranteed h_FE range simplifies base resistor selection for precise turn-on threshold; V_CB0 = −120 V prevents reverse-bias failure during rail sequencing transients.

DC-DC Converter Output Stage

Relay Driver Circuit

Use Scenario: High-side switching in non-isolated buck or flyback converters delivering up to 1.2 A at 24–48 V input.

IC Role / Device Role / Timing Role: PNP switch controlling energy transfer to output inductor; operates in saturated on/off mode at 20–100 kHz.

Use Value: V_CEO = −100 V provides 2× margin over 48 V bus, while low V_CE(sat) reduces thermal stress during continuous conduction mode.

Use Scenario: Driving 12 V/24 V electromagnetic relays with coil resistance 100–500 Ω in PLC I/O modules.

IC Role / Device Role / Timing Role: Medium-current PNP switch providing fast turn-on/turn-off to eliminate contact bounce and reduce relay wear.

Use Value: t_on/t_off ≤ 80/1000 ns ensures clean coil energization/de-energization; TO-126ML tab aids heat dissipation during repeated actuation.

Motor Brake Control

Power Supply Sequencing

Use Scenario: Dynamic braking of small DC motors (≤100 W) by shorting armature through PNP switch during deceleration.

IC Role / Device Role / Timing Role: High-current sinking switch activated only during braking phase; handles peak currents up to −1.5 A.

Use Value: P_C = 1.5 W and T_j(max) = 150 °C allow brief high-power dissipation without thermal shutdown in intermittent duty cycles.

Use Scenario: Enabling/disabling auxiliary rails (e.g., −5 V, −12 V) in multi-rail industrial power supplies with controlled ramp-up timing.

IC Role / Device Role / Timing Role: Voltage-controlled enable switch placed between input and LDO or linear regulator input.

Use Value: Guaranteed h_FE range simplifies base resistor selection for precise turn-on threshold; V_CB0 = −120 V prevents reverse-bias failure during rail sequencing transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SB1210	V_CEO = −120 V, I_C = −1.5 A, P_C = 1.5 W, h_FE = 82–160, TO-126 package	Higher breakdown voltage but narrower h_FE range; slightly slower t_off (1200 ns)	Select when >100 V transient immunity is required and tighter h_FE tolerance is not critical.
BCP53-16	V_CEO = −45 V, I_C = −1.0 A, P_C = 1.25 W, SOT-223 package, h_FE = 100–250	Lower voltage/current rating; surface-mount only; no integrated heatsink tab	Choose for space-constrained PCBs where 45 V max rail and <1 A load apply; requires external thermal design.

Compared with 2SB1144S, 2SB1210 offers enhanced voltage margin but reduced gain consistency, while BCP53-16 trades ruggedness and thermal capability for compactness and SMT compatibility-neither is pin-compatible, and layout changes are required for substitution.

Availability

2SB1144S is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) I/O modules, and DC-DC converter designs requiring stable component supply and long-term obsolescence management.

Supply support for 2SB1144S 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 power discrete devices, analog ICs, and optoelectronics before its acquisition by Panasonic in 2012.

The 2SB1144S belongs to SANYO's legacy PNP switching transistor family engineered for industrial-grade reliability in medium-power linear and switching applications with emphasis on thermal robustness and voltage safety margins.

FAQ

What is the maximum junction temperature rating for the 2SB1144S?

The 2SB1144S has a maximum junction temperature (T_j) rating of +150 °C, verified per Absolute Maximum Ratings table. This allows operation in high-ambient environments when mounted on an adequately sized heatsink or PCB copper area. Derating curves in the official datasheet define safe power limits above 25 °C case temperature. Always ensure thermal design maintains T_j ≤ 150 °C during worst-case load conditions for the 2SB1144S.

Is the 2SB1144S pin-compatible with the 2SD1684 NPN companion device?

No, the 2SB1144S and 2SD1684 are complementary PNP/NPN transistors sharing the same TO-126ML package outline and pin numbering (Emitter–Collector–Base), but they are not pin-compatible replacements due to opposite polarity. Swapping them without circuit redesign will cause functional failure. The 2SB1144S must be used in PNP-configured circuits; the 2SD1684 serves NPN roles. Both require separate base drive polarity and biasing for the 2SB1144S.

Does the 2SB1144S have a built-in heatsink, and how is it electrically isolated?

Yes, the 2SB1144S uses the TO-126ML package with a molded plastic-covered metal tab that functions as an integrated heatsink. The tab is electrically connected to the emitter (Pin 1), so isolation from the PCB ground plane or heatsink is required unless the emitter node is at system ground potential. No internal dielectric layer exists-the tab is a direct extension of the emitter metallization, confirmed by SANYO's package diagram and thermal test conditions.

What h_FE bin does the 'S' suffix in 2SB1144S indicate?

The 'S' suffix in 2SB1144S denotes the h_FE classification bin of 100–200 at V_CE = −5 V and I_C = −100 mA, as specified in the "h_FE Classification" section of the datasheet. Other variants include 'Q' (200–400) and 'T' (400–800). This binning ensures predictable base current requirements for consistent saturation across production lots of the 2SB1144S.

Can the 2SB1144S be used in linear amplifier applications?

The 2SB1144S is characterized and optimized for switching operation-not linear amplification. Its Safe Operating Area (SOA) and thermal design prioritize pulsed/saturated use, and parameters like f_T and linearity are not specified for analog gain. While it may function in Class-A emitter-follower configurations at low signal levels, SANYO explicitly positions the 2SB1144S for switching applications, and using it as a linear amplifier risks thermal runaway or inconsistent performance. For amplification, select purpose-built audio or general-purpose transistors instead of the 2SB1144S.

2SB1144S Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 140 @ 100mA, 5V

Power - Max:: 1.5 W

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126ML

2SB1144S FAQ

1.How can I place an order for 2SB1144S through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SB1144S 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 2SB1144S reliable?

The price and inventory of 2SB1144S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SB1144S is usually 5 days.

3.What payment methods are accepted for 2SB1144S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SB1144S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SB1144S?

2SB1144S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SB1144S 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 2SB1144S?

For technical support, including 2SB1144S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SB1144S requirements.

6.How does Aetrix verify that 2SB1144S is sourced from the original manufacturer or authorized distributors?

All 2SB1144S 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 2SB1144S meets industry standards.

7.What is the process for return or replacement of 2SB1144S?

All 2SB1144S units undergo pre-shipment inspection (PSI). If there is an issue with 2SB1144S, 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 2SB1144S part is unused and in its original packaging.

Return procedure for 2SB1144S:

1.Submit a request within 90 days.

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

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