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

onsemi 2SB1123T-TD-EX

Name: 2SB1123T-TD-EX
Brand: onsemi
SKU: 2SB1123T-TD-EX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SB1123T-TD-EX

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: 2SB1123T-TD-EX.pdf

Description:: TRANS PNP 50V 2A PCP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SB1123T-TD-EX from onsemi is a PNP bipolar junction transistor rated for –50 V V_CEO, –2 A I_C, and low –0.3 V typical V_CE(sat) at –1 A/–50 mA drive, fabricated using FBET/MBIT processes and housed in the PCP (SC-62/SOT-89) package. It serves as a high-current switching element in voltage regulators, relay drivers, and lamp drivers where compact size and thermal efficiency are critical.

For engineers reviewing the 2SB1123T-TD-EX datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, terminal mapping, real-world use cases, and validated alternative parts - all aligned to the official EN1727F datasheet and ON Semiconductor's PCP packaging standard.

Technical Context

This PNP transistor operates with a guaranteed h_FE range of 200–400 (Rank T), supports fast switching with t_on = 60 ns and t_f = 30 ns, and maintains stable gain up to 150 MHz f_T at –10 V V_CE and –50 mA I_C. Its low V_CE(sat) and wide ASO enable robust performance in pulsed-load applications.

The device is optimized for mounting on ceramic substrates (250 mm² × 0.8 mm), delivering 1.3 W P_C dissipation under those conditions, while its –55°C to +150°C T_stg and 150°C T_j ratings support industrial ambient operation without derating below 25°C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–50 V: Maximum safe collector-emitter reverse bias before breakdown in common-emitter configuration.
I_C	–2 A: Continuous DC collector current handling capability at 25°C ambient with proper heatsinking.
V_CE(sat)	–0.3 V (typ) at –1 A/–50 mA: Low saturation voltage reduces conduction loss and heat generation in switching mode.
h_FE	200–400 (Rank T): Guaranteed DC current gain range ensures predictable base drive requirements across production lots.
f_T	150 MHz: Gain-bandwidth product confirms suitability for medium-speed switching up to ~10–20 MHz practical operation.
t_on/t_f	60 ns / 30 ns: Fast turn-on and fall times support efficient PWM control in power management circuits.
P_C (ceramic)	1.3 W: Power dissipation capacity when mounted on specified 250 mm² × 0.8 mm ceramic substrate.

Pinout & Package

2SB1123T-TD-EX uses the PCP package (JEITA SC-62 / JEDEC SOT-89), a surface-mount, 3-terminal ultraminiature plastic case with exposed collector tab for thermal conduction. Dimensions: 4.5 mm × 2.5 mm × 1.6 mm (L×W×H), mass 0.058 g.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control electrode; requires –50 mA typical drive current to saturate at –1 A collector load.
2	Collector	Main current output terminal; electrically connected to exposed metal tab for thermal and electrical grounding.
3	Emitter	Current return path; tied to system ground or negative rail in high-side switch configurations.

Key Features

Feature	Design Value
Low V_CE(sat)	–0.3 V typ at –1 A enables <150 mW conduction loss per switch, reducing thermal stress in dense layouts.
Wide ASO	Robust secondary breakdown margin allows reliable operation under inductive load transients without snubbers.
Fast switching	60 ns t_on and 30 ns t_f support >1 MHz PWM frequencies in DC-DC and motor control stages.
Ultraminiature PCP	SOT-89 footprint saves >40% board area vs. TO-92, enabling higher-density hybrid IC integration.
FBET/MBIT process	Enables tight h_FE distribution (Rank T: 200–400) and consistent V_BE(sat) (–0.9 to –1.2 V) across temperature.

Applications

Voltage Regulator Output Stage	Relay Driver Circuit
Use Scenario: Linear pass transistor in adjustable positive-voltage regulators delivering up to 1.5 A load current. IC Role / Device Role / Timing Role: PNP pass element controlling output voltage via emitter-follower configuration with feedback loop compensation. Use Value: Low V_CE(sat) minimizes dropout voltage and improves efficiency at full load; Rank T h_FE ensures stable regulation across line/load variations.	Use Scenario: High-current driver for 12 V/24 V electromagnetic relays with coil resistance ≤ 100 Ω. IC Role / Device Role / Timing Role: Single-stage saturated switch interfacing microcontroller GPIO to relay coil, with flyback diode integrated externally. Use Value: –2 A I_C rating handles relay inrush currents; fast t_f prevents contact chatter during deactivation.
Lamp Driver for Automotive Lighting	Industrial Control Signal Amplifier
Use Scenario: On/off control of incandescent or halogen lamps (5–20 W) in vehicle interior lighting modules. IC Role / Device Role / Timing Role: Ground-referenced PNP switch sourcing current to lamp anode, driven by CAN/LIN interface logic. Use Value: Wide T_stg (–55°C to +150°C) and robust V_(BR)CEO (–50 V) withstand automotive load-dump transients and cold-cranking conditions.	Use Scenario: Level-shifting and current amplification stage in PLC I/O modules driving 4–20 mA analog outputs or solenoid valves. IC Role / Device Role / Timing Role: Discrete current booster between DAC output and field-side load, operating in linear or switched mode. Use Value: High h_FE (200–400) reduces required DAC drive current; PCP package allows placement near connectors for EMI mitigation.

Voltage Regulator Output Stage

Relay Driver Circuit

Use Scenario: Linear pass transistor in adjustable positive-voltage regulators delivering up to 1.5 A load current.

IC Role / Device Role / Timing Role: PNP pass element controlling output voltage via emitter-follower configuration with feedback loop compensation.

Use Value: Low V_CE(sat) minimizes dropout voltage and improves efficiency at full load; Rank T h_FE ensures stable regulation across line/load variations.

Use Scenario: High-current driver for 12 V/24 V electromagnetic relays with coil resistance ≤ 100 Ω.

IC Role / Device Role / Timing Role: Single-stage saturated switch interfacing microcontroller GPIO to relay coil, with flyback diode integrated externally.

Use Value: –2 A I_C rating handles relay inrush currents; fast t_f prevents contact chatter during deactivation.

Lamp Driver for Automotive Lighting

Industrial Control Signal Amplifier

Use Scenario: On/off control of incandescent or halogen lamps (5–20 W) in vehicle interior lighting modules.

IC Role / Device Role / Timing Role: Ground-referenced PNP switch sourcing current to lamp anode, driven by CAN/LIN interface logic.

Use Value: Wide T_stg (–55°C to +150°C) and robust V_(BR)CEO (–50 V) withstand automotive load-dump transients and cold-cranking conditions.

Use Scenario: Level-shifting and current amplification stage in PLC I/O modules driving 4–20 mA analog outputs or solenoid valves.

IC Role / Device Role / Timing Role: Discrete current booster between DAC output and field-side load, operating in linear or switched mode.

Use Value: High h_FE (200–400) reduces required DAC drive current; PCP package allows placement near connectors for EMI mitigation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SB1123S-TD-E	Same PCP package and electrical specs, but Rank S h_FE = 140–280 (lower gain, tighter spread).	Preferred where lower base drive sensitivity is needed or where gain consistency matters more than peak current gain.	Select 2SB1123S-TD-E when designing for worst-case h_FE ≥ 140 and minimizing base current variation across temperature.
MJD2955G	TO-220 package, –60 V V_CEO, –10 A I_C, higher P_C (1.5 W on PCB), but slower t_f = 1.2 μs.	Used in higher-power linear regulators or motor drivers where thermal mass and layout space allow larger packages.	Choose MJD2955G only when >2 A continuous current or >1.3 W dissipation is required - not a drop-in replacement due to package and speed mismatch.

Compared with 2SB1123S-TD-E, the 2SB1123T-TD-EX offers higher minimum h_FE for reduced base drive burden; versus MJD2955G, it trades raw power handling for superior switching speed and board-area efficiency in space-constrained designs.

Availability

2SB1123T-TD-EX is available at Aetrix Electronics and suitable for voltage regulators, relay drivers, and lamp drivers requiring stable component supply, consistent parametric binning (Rank T), and long-term industrial lifecycle support.

Supply support for 2SB1123T-TD-EX 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 2SB1123 series belongs to onsemi's general-purpose bipolar transistor portfolio, designed specifically for high-reliability discrete switching in compact, thermally constrained power interfaces - not for RF or precision analog use.

FAQ

What is the h_FE range for 2SB1123T-TD-EX?

The 2SB1123T-TD-EX is binned to Rank T, guaranteeing a DC current gain (h_FE) of 200 to 400 when measured at V_CE = –2 V and I_C = –100 mA. This range is confirmed in the EN1727F datasheet and applies to every unit shipped as 2SB1123T-TD-EX. The 2SB1123T-TD-EX does not share h_FE bins with S- or U-ranked variants.

Is 2SB1123T-TD-EX RoHS compliant and lead-free?

Yes, the 2SB1123T-TD-EX is Pb-free and RoHS compliant, as indicated by the "-E" suffix in its full ordering code and confirmed in the "Pb Free" note under Shipping memo in the EN1727F datasheet. The device meets JESD97 and JEDEC JS-001 ESD standards with HBM ≥ 2 kV.

What is the maximum power dissipation for 2SB1123T-TD-EX on a standard PCB?

When mounted on a standard FR-4 PCB (not ceramic), the 2SB1123T-TD-EX has a maximum P_C of 0.5 W at T_a = 25°C, per the Absolute Maximum Ratings table. Derating begins at 4.2 mW/°C above 25°C ambient. For 1.3 W operation, the EN1727F datasheet specifies mounting on a 250 mm² × 0.8 mm ceramic substrate.

Can 2SB1123T-TD-EX replace 2SB1123S-TD-E in an existing design?

Yes, the 2SB1123T-TD-EX is pin-compatible and electrically interchangeable with 2SB1123S-TD-E, differing only in h_FE bin (T: 200–400 vs. S: 140–280). No PCB changes are required, but verify base drive sufficiency under worst-case h_FE = 200 if the original design used S-rank units at h_FE = 140.

What is the recommended land pattern for 2SB1123T-TD-EX?

The EN1727F datasheet provides a land pattern example on page 8 (PS No.1727-8/8): pad length 3.0 mm, width 1.5 mm, spacing 1.8 mm between pins 1–2 and 2–3, with thermal pad (pin 2) extended to ≥ 10 mm² copper area. Use solder mask defined pads and 0.2 mm stencil aperture for optimal reflow yield.

2SB1123T-TD-EX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 2SB1123

Package/Case:: TO-243AA

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 2 A

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

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 1A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 100mA, 2V

Power - Max:: 500 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PCP

2SB1123T-TD-EX FAQ

1.How can I place an order for 2SB1123T-TD-EX through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SB1123T-TD-EX 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 2SB1123T-TD-EX reliable?

The price and inventory of 2SB1123T-TD-EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SB1123T-TD-EX is usually 5 days.

3.What payment methods are accepted for 2SB1123T-TD-EX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SB1123T-TD-EX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SB1123T-TD-EX?

2SB1123T-TD-EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SB1123T-TD-EX 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 2SB1123T-TD-EX?

For technical support, including 2SB1123T-TD-EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SB1123T-TD-EX requirements.

6.How does Aetrix verify that 2SB1123T-TD-EX is sourced from the original manufacturer or authorized distributors?

All 2SB1123T-TD-EX 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 2SB1123T-TD-EX meets industry standards.

7.What is the process for return or replacement of 2SB1123T-TD-EX?

All 2SB1123T-TD-EX units undergo pre-shipment inspection (PSI). If there is an issue with 2SB1123T-TD-EX, 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 2SB1123T-TD-EX part is unused and in its original packaging.

Return procedure for 2SB1123T-TD-EX:

1.Submit a request within 90 days.

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

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