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

onsemi 2SB1226

Name: 2SB1226
Brand: onsemi
SKU: 2SB1226
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SB1226

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: 2SB1226.pdf

Description:: TRANS PNP DARL 100V 3A TO-220ML

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SB1226 from SANYO is a PNP epitaxial planar silicon Darlington transistor in TO-220ML package, rated for V_CEO = –100 V, I_C = –3 A, P_C = 2 W (T_c = 25 °C), with DC current gain h_FE ≥ 1000 at I_C = –1.5 A, used in relay drivers and motor control circuits.

For engineers reviewing the 2SB1226 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed high h_FE, low V_CE(sat) ≤ –1.5 V at I_C = –1.5 A, wide SOA up to –100 V/–3 A, micaless mounting compatibility, and thermal performance validated to T_j = 150 °C.

Technical Context

The 2SB1226 operates as a high-gain PNP Darlington pair with integrated base-emitter shunt resistor network enabling direct TTL/CMOS drive. Its switching behavior is characterized by t_on = 0.8 µs, t_off = 5.0 µs, and t_f = 1.2 µs under specified test conditions (V_CC = –50 V, I_C = –1 A, R_B = 6 kΩ).

It features a thermally robust TO-220ML package with exposed collector tab, rated for continuous operation up to T_c = 150 °C and storage from –55 °C to +150 °C, and exhibits V_BE(sat) ≤ –2.0 V at I_C = –1.5 A with I_C/I_B = 500.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–100 V - Maximum safe collector-emitter voltage before breakdown in open-base condition.
I_C (DC)	–3 A - Continuous collector current rating defining steady-state load-handling capability.
P_C (T_c = 25 °C)	2 W - Maximum power dissipation at case temperature 25 °C; derates linearly above 25 °C.
h_FE	1000–4000 - DC current gain range at I_C = –1.5 A, V_CE = –3 V, enabling low-base-drive designs.
V_CE(sat)	≤ –1.5 V - Saturation voltage at I_C = –1.5 A, I_B = –3 mA, directly impacting conduction loss and heat generation.
f_T	2 MHz - Transition frequency at V_CE = –5 V, I_C = –1.5 A, indicating usable bandwidth for medium-speed switching.
T_j max	+150 °C - Maximum junction temperature limit; defines thermal design margin for heatsink sizing.

Pinout & Package

2SB1226 uses the TO-220ML package with micaless mounting surface and electrically isolated collector tab. Pin numbering follows standard TO-220 orientation: viewed from front (label side), pins are numbered left-to-right as Base (1), Collector (2), Emitter (3). The collector is internally connected to the metal tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to enable Darlington conduction; requires external current-limiting resistor when driven from logic.
2 (Collector)	Main current output terminal	Internally bonded to metal tab; must be electrically isolated from heatsink unless circuit ground reference permits direct mounting.
3 (Emitter)	Current return path	Connected to load return or system ground; carries full load current and defines emitter-referenced bias point.

Key Features

Feature	Design Value
High DC current gain	h_FE ≥ 1000 at I_C = –1.5 A enables microcontroller-level base drive without additional amplification stages.
Wide Safe Operating Area (SOA)	Rated for –100 V / –3 A single-pulse operation supports robust handling of inductive kickback in relay/motor loads.
Micaless TO-220ML package	Eliminates insulating washer requirement, reducing thermal resistance and assembly cost in high-volume mounting.
Low saturation voltage	V_CE(sat) ≤ –1.5 V at I_C = –1.5 A minimizes conduction losses and improves efficiency in high-current switching applications.
Fast switching speed	t_on/t_off/t_f = 0.8/5.0/1.2 µs allows reliable operation up to ~100 kHz PWM frequencies in driver circuits.

Applications

Relay Driver Circuit	Printer Hammer Driver
Use Scenario: Driving 24 V/500 mA electromagnetic relays in industrial PLC output modules. IC Role / Device Role / Timing Role: High-gain PNP Darlington switch providing galvanically isolated load control with minimal base drive current. Use Value: Enables direct interface with 3.3 V/5 V logic outputs while sustaining 100% duty-cycle operation and surviving 200 V inductive flyback transients.	Use Scenario: Actuating solenoid-based print hammers in dot-matrix printers requiring precise 10 ms pulse timing. IC Role / Device Role / Timing Role: Fast-switching PNP output stage delivering peak current >2 A for mechanical impact generation. Use Value: Low t_f (1.2 µs) and wide SOA ensure clean turn-off and prevent hammer bounce; V_CE(sat) ≤ –1.5 V limits self-heating during repetitive pulsing.
Voltage Regulator Control	Motor Driver Stage
Use Scenario: Series pass transistor in linear voltage regulators supplying ±15 V analog circuitry. IC Role / Device Role / Timing Role: High-current, high-voltage PNP pass element regulating output via feedback-controlled base bias. Use Value: V_CEO = –100 V provides ample headroom for 72 V input rails; h_FE ≥ 1000 reduces error amplifier loading and improves regulation accuracy.	Use Scenario: H-bridge high-side switch in 24 V brushed DC motor controllers for HVAC actuators. IC Role / Device Role / Timing Role: PNP Darlington configured as saturated switch controlling motor direction and speed via PWM. Use Value: Micaless TO-220ML simplifies heatsinking in space-constrained enclosures; T_j = 150 °C rating supports continuous 2 A operation in ambient up to 70 °C.

Relay Driver Circuit

Printer Hammer Driver

Use Scenario: Driving 24 V/500 mA electromagnetic relays in industrial PLC output modules.

IC Role / Device Role / Timing Role: High-gain PNP Darlington switch providing galvanically isolated load control with minimal base drive current.

Use Value: Enables direct interface with 3.3 V/5 V logic outputs while sustaining 100% duty-cycle operation and surviving 200 V inductive flyback transients.

Use Scenario: Actuating solenoid-based print hammers in dot-matrix printers requiring precise 10 ms pulse timing.

IC Role / Device Role / Timing Role: Fast-switching PNP output stage delivering peak current >2 A for mechanical impact generation.

Use Value: Low t_f (1.2 µs) and wide SOA ensure clean turn-off and prevent hammer bounce; V_CE(sat) ≤ –1.5 V limits self-heating during repetitive pulsing.

Voltage Regulator Control

Motor Driver Stage

Use Scenario: Series pass transistor in linear voltage regulators supplying ±15 V analog circuitry.

IC Role / Device Role / Timing Role: High-current, high-voltage PNP pass element regulating output via feedback-controlled base bias.

Use Value: V_CEO = –100 V provides ample headroom for 72 V input rails; h_FE ≥ 1000 reduces error amplifier loading and improves regulation accuracy.

Use Scenario: H-bridge high-side switch in 24 V brushed DC motor controllers for HVAC actuators.

IC Role / Device Role / Timing Role: PNP Darlington configured as saturated switch controlling motor direction and speed via PWM.

Use Value: Micaless TO-220ML simplifies heatsinking in space-constrained enclosures; T_j = 150 °C rating supports continuous 2 A operation in ambient up to 70 °C.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SB1184	V_CEO = –80 V, I_C = –2 A, h_FE ≥ 1000 at I_C = –1 A, TO-220 package	Limited voltage/current headroom; unsuitable for 100 V bus or >2 A loads	Select only if operating voltage ≤ 60 V and peak current < 2 A; verify SOA curves for inductive loads.
BD679	V_CEO = –80 V, I_C = –4 A, h_FE ≥ 750 at I_C = –2 A, TO-126 package	Higher current but lower gain and smaller package; no micaless option	Prefer for compact layouts where thermal mass is managed externally; not drop-in due to different footprint and pinout.

Compared with 2SB1226, 2SB1184 offers reduced voltage margin and lower current capacity, while BD679 trades gain and thermal mounting simplicity for higher current in a smaller outline-neither is pin-compatible, and both require PCB layout revision and SOA revalidation.

Availability

2SB1226 is available at Aetrix Electronics and suitable for relay drivers, printer hammer drivers, and voltage regulator control applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial automation systems.

Supply support for 2SB1226 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 2011.

The 2SB1226 belongs to SANYO's ENN2212B series of high-gain PNP Darlington transistors designed specifically for industrial driver applications demanding reliability, wide SOA, and simplified thermal mounting.

FAQ

What is the maximum continuous collector current rating for the 2SB1226?

The 2SB1226 has a maximum continuous collector current rating of –3 A at case temperature T_c = 25 °C. This rating decreases with rising case temperature per the derating curve in the datasheet; at T_c = 100 °C, the usable I_C drops to approximately –1.5 A. Exceeding this limit risks thermal runaway and permanent device failure.

Does the 2SB1226 require an insulating washer when mounted to a heatsink?

No, the 2SB1226 uses a micaless TO-220ML package where the collector is electrically isolated from the mounting surface by internal construction. This eliminates the need for a mica or silicone washer, reducing thermal resistance and assembly complexity. However, verify that the heatsink is either floating or referenced to collector potential before mounting.

What is the typical DC current gain (h_FE) of the 2SB1226 at I_C = –1.5 A?

The 2SB1226 guarantees h_FE ≥ 1000 at I_C = –1.5 A, V_CE = –3 V, and T_a = 25 °C. Typical values reach 2000–4000 under these conditions, enabling very low base drive requirements-e.g., only –3 mA base current needed to sustain –1.5 A collector current.

Can the 2SB1226 be used in avalanche mode for inductive load protection?

No, the 2SB1226 is not rated or characterized for controlled avalanche operation. Its absolute maximum V_CEO rating of –100 V applies only under specified test conditions with base open. For inductive load switching, external clamping (e.g., flyback diode) is mandatory to prevent voltage overshoot beyond rated limits and avoid destructive breakdown.

What is the thermal resistance from junction to case (R_θJC) for the 2SB1226?

The 2SB1226 has a typical junction-to-case thermal resistance (R_θJC) of 1.25 °C/W, measured from the silicon die to the metal tab surface. This value assumes proper mounting pressure and thermal interface material; actual system-level R_θJA depends on heatsink design and ambient conditions.

2SB1226 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 3 A

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

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 3mA, 1.5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1500 @ 1.5A, 3V

Power - Max:: 2 W

Frequency - Transition:: 20MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220ML

2SB1226 FAQ

1.How can I place an order for 2SB1226 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SB1226 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 2SB1226 reliable?

The price and inventory of 2SB1226 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SB1226 is usually 5 days.

3.What payment methods are accepted for 2SB1226?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SB1226 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SB1226?

2SB1226 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SB1226 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 2SB1226?

For technical support, including 2SB1226 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SB1226 requirements.

6.How does Aetrix verify that 2SB1226 is sourced from the original manufacturer or authorized distributors?

All 2SB1226 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 2SB1226 meets industry standards.

7.What is the process for return or replacement of 2SB1226?

All 2SB1226 units undergo pre-shipment inspection (PSI). If there is an issue with 2SB1226, 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 2SB1226 part is unused and in its original packaging.

Return procedure for 2SB1226:

1.Submit a request within 90 days.

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

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