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

onsemi 2SB1229S-AA

Name: 2SB1229S-AA
Brand: onsemi
SKU: 2SB1229S-AA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SB1229S-AA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: 2SB1229S-AA.pdf

Description:: TRANS PNP 50V 2A 3-NP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SB1229S-AA from SANYO is a PNP epitaxial planar silicon transistor designed for medium-power switching and driver applications, with V_CEO = −50 V, I_C = −2 A, P_C = 0.75 W at T_A = 25 °C, and low V_CE(sat) of −0.45 V at I_C = −1 A / I_B = −50 mA - used in relay drivers, lamp drivers, and voltage regulators.

For engineers reviewing the 2SB1229S-AA datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE binning (Rank S: h_FE = 200–400), fast switching time (t_f = 30 ns), and thermal derating behavior up to T_J = 150 °C.

Technical Context

This device operates as a single PNP bipolar junction transistor in linear or saturated switching mode, with base-emitter and base-collector junctions fabricated using FBET and MBIT processes for improved current handling and saturation performance. It supports DC and pulsed operation up to I_CP = −3 A (10 ms pulse) and exhibits f_T = 150 MHz at V_CE = −10 V, I_C = −50 mA.

Electrical behavior is characterized by tight V_BE(sat) distribution (−1.0 V to −1.3 V at I_C = −1 A), low Cob = 21 pF at V_CB = −10 V, and stable h_FE across temperature (−25 °C to +75 °C). The device is not rated for automotive or safety-critical systems per SANYO's application disclaimer.

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 voltage headroom in high-side switch designs.
I_C (DC)	−2 A: Continuous collector current rating; supports load switching up to ~24 W at 12 V with adequate heatsinking.
P_C	0.75 W at T_A = 25 °C: Power dissipation limit at ambient; requires thermal derating above 25 °C per PC–Ta curve (e.g., ~0.44 W at 75 °C).
V_CE(sat)	−0.45 V max at I_C = −1 A / I_B = −50 mA: Low saturation voltage reduces conduction loss and heat generation in driver stages.
h_FE (Rank S)	200–400 at V_CE = −2 V, I_C = −100 mA: Guaranteed DC current gain bin ensures predictable base drive requirements.
t_f	30 ns: Fall time measured under specified test conditions (V_CC = 25 V, R_L = 470 µF); enables reliable operation up to ~10 MHz switching frequency.
f_T	150 MHz at V_CE = −10 V, I_C = −50 mA: Gain-bandwidth product confirms suitability for medium-speed amplification or RF pre-driver roles.

Pinout & Package

2SB1229S-AA is housed in a TO-126 (SC-43) plastic package with 3 leads: emitter (lead 1), collector (lead 2), base (lead 3). The package provides mechanical robustness and moderate thermal performance (R_θJA ≈ 167 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit terminal for PNP device	Connected to higher potential rail in high-side switch configurations; must be referenced to system ground via load or bias network.
2 (Collector)	Current entry terminal	Typically tied to load return path or supply rail; polarity reversal required vs NPN layout in PCB design.
3 (Base)	Control input for minority-carrier injection	Requires negative bias relative to emitter to turn on; base resistor sizing must account for h_FE bin and desired saturation margin.

Key Features

Feature	Design Value
FBET/MBIT process technology	Enables large current capacity (I_C = −2 A) and consistent h_FE binning without wafer-level trimming.
Low V_CE(sat)	−0.45 V max ensures <1% conduction loss at 12 V loads, reducing thermal stress in compact driver circuits.
Fast switching (t_f = 30 ns)	Supports clean edge transitions in PWM-driven relays and lamps, minimizing cross-conduction risk in H-bridge auxiliary stages.
Guaranteed h_FE Rank S	200–400 range allows precise base drive calculation without overdesigning current-limiting resistors.
Thermal stability	Specified T_J = 150 °C and T_stg = −55 to +150 °C enable use in industrial enclosures with limited airflow.

Applications

Voltage Regulator Pass Element	Relay Driver Stage
Use Scenario: Used as series pass transistor in discrete linear voltage regulators delivering up to 1.5 A at 5–12 V output. IC Role / Device Role / Timing Role: PNP pass element controlling output voltage via emitter-follower configuration with feedback to base. Use Value: Low V_CE(sat) minimizes dropout voltage and power loss, while Rank S h_FE ensures stable regulation under varying load currents.	Use Scenario: Drives 12 V/500 mA electromagnetic relays in PLC I/O modules and industrial control panels. IC Role / Device Role / Timing Role: High-current saturated switch turning relay coil on/off under microcontroller GPIO control. Use Value: Fast t_f prevents contact chatter during deactivation; −2 A rating accommodates relay inrush peaks without secondary protection.
Lamp Driver for Indicative Lighting	Electrical Equipment Load Switch
Use Scenario: Controls incandescent or halogen indicator lamps (e.g., 24 V/10 W panel lights) in test equipment and instrumentation. IC Role / Device Role / Timing Role: Medium-power switch interfacing between logic-level control signals and filament loads. Use Value: Robust SOA supports lamp cold-resistance surges; TO-126 package allows direct mounting to metal chassis for passive cooling.	Use Scenario: Switches auxiliary loads such as solenoids, fans, or status LEDs in HVAC controllers and building automation systems. IC Role / Device Role / Timing Role: General-purpose load interface transistor providing isolation and current gain between MCU outputs and field devices. Use Value: −50 V V_CEO headroom handles inductive kickback from 24 V solenoids; guaranteed h_FE simplifies firmware-safe drive logic.

Voltage Regulator Pass Element

Relay Driver Stage

Use Scenario: Used as series pass transistor in discrete linear voltage regulators delivering up to 1.5 A at 5–12 V output.

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

Use Value: Low V_CE(sat) minimizes dropout voltage and power loss, while Rank S h_FE ensures stable regulation under varying load currents.

Use Scenario: Drives 12 V/500 mA electromagnetic relays in PLC I/O modules and industrial control panels.

IC Role / Device Role / Timing Role: High-current saturated switch turning relay coil on/off under microcontroller GPIO control.

Use Value: Fast t_f prevents contact chatter during deactivation; −2 A rating accommodates relay inrush peaks without secondary protection.

Lamp Driver for Indicative Lighting

Electrical Equipment Load Switch

Use Scenario: Controls incandescent or halogen indicator lamps (e.g., 24 V/10 W panel lights) in test equipment and instrumentation.

IC Role / Device Role / Timing Role: Medium-power switch interfacing between logic-level control signals and filament loads.

Use Value: Robust SOA supports lamp cold-resistance surges; TO-126 package allows direct mounting to metal chassis for passive cooling.

Use Scenario: Switches auxiliary loads such as solenoids, fans, or status LEDs in HVAC controllers and building automation systems.

IC Role / Device Role / Timing Role: General-purpose load interface transistor providing isolation and current gain between MCU outputs and field devices.

Use Value: −50 V V_CEO headroom handles inductive kickback from 24 V solenoids; guaranteed h_FE simplifies firmware-safe drive logic.

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
2SB1182	V_CEO = −40 V, I_C = −1.5 A, h_FE = 120–240 (no rank binning)	Lower voltage/current ratings; suitable only for ≤24 V, ≤1 A loads	Select when lower cost and reduced performance margin are acceptable; verify SOA compliance for inductive loads.
MJD2955G	V_CEO = −60 V, I_C = −10 A, TO-220 package, h_FE = 20–70 (unbinned)	Higher power capability but wider h_FE spread; requires larger PCB footprint and heatsink	Choose for high-current, high-voltage applications where thermal management infrastructure exists; not drop-in due to package and gain mismatch.

Compared with 2SB1229S-AA, 2SB1182 offers lower cost but reduced voltage margin and no h_FE binning, while MJD2955G delivers higher current and voltage headroom at the expense of gain predictability and board space - making 2SB1229S-AA optimal for precision medium-power driver designs requiring repeatable base drive and compact layout.

Availability

2SB1229S-AA is available at Aetrix Electronics and suitable for voltage regulators, relay drivers, lamp drivers, and electrical equipment requiring stable component supply and guaranteed h_FE binning.

Supply support for 2SB1229S-AA 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 analog and power discrete devices before its acquisition by Panasonic in 2012; known for high-reliability bipolar transistors and optoelectronics.

The 2SB1229S-AA belongs to SANYO's general-purpose PNP transistor family engineered for industrial driver and regulator applications where predictable gain, low saturation voltage, and thermal stability are critical.

FAQ

What is the guaranteed h_FE range for 2SB1229S-AA?

The 2SB1229S-AA is binned to Rank S, guaranteeing h_FE = 200–400 at V_CE = −2 V and I_C = −100 mA. This specification is confirmed in the official SANYO datasheet No. 2158–1/5 and applies directly to the 2SB1229S-AA variant. Designers can rely on this range to calculate precise base resistor values without overdesigning drive circuitry for the 2SB1229S-AA.

Can 2SB1229S-AA replace 2SB1229 in existing designs?

Yes - the 2SB1229S-AA is a binned version of the base 2SB1229, with identical pinout, package (TO-126), absolute maximum ratings, and electrical characteristics except for guaranteed h_FE (Rank S). The "S-AA" suffix denotes tighter h_FE sorting, so the 2SB1229S-AA is fully compatible and often preferred in designs requiring predictable current gain for the 2SB1229S-AA.

What is the maximum allowable junction temperature for 2SB1229S-AA?

The absolute maximum junction temperature (T_J) for 2SB1229S-AA is 150 °C, as specified in the SANYO datasheet. Operation beyond this limit risks permanent degradation. Derating curves show usable power dissipation drops to ~0.44 W at T_A = 75 °C, meaning thermal design for the 2SB1229S-AA must ensure junction temperature remains within spec under worst-case ambient and load conditions.

Does 2SB1229S-AA support pulsed operation beyond its DC current rating?

Yes - the 2SB1229S-AA supports pulsed collector current up to −3 A for 10 ms (single pulse), as defined in the Safe Operating Area (SOA) chart. This capability enables short-duration surge handling in relay coil energization or lamp inrush scenarios. However, average power must remain within the DC dissipation limit, and pulse duty cycle must be validated against the SOA plot for the 2SB1229S-AA.

Is 2SB1229S-AA suitable for automotive applications?

No - SANYO explicitly states that the 2SB1229S-AA (and all products in this datasheet) are not qualified for life-support, aircraft control, or other high-reliability applications where failure could cause serious physical or material damage. The 2SB1229S-AA lacks AEC-Q101 qualification, and its reliability data does not cover automotive temperature or lifetime requirements.

2SB1229S-AA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

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:: 140 @ 100mA, 2V

Power - Max:: 750 mW

Frequency - Transition:: 150MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-NP

2SB1229S-AA FAQ

1.How can I place an order for 2SB1229S-AA through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SB1229S-AA 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 2SB1229S-AA reliable?

The price and inventory of 2SB1229S-AA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SB1229S-AA is usually 5 days.

3.What payment methods are accepted for 2SB1229S-AA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SB1229S-AA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SB1229S-AA?

2SB1229S-AA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SB1229S-AA 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 2SB1229S-AA?

For technical support, including 2SB1229S-AA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SB1229S-AA requirements.

6.How does Aetrix verify that 2SB1229S-AA is sourced from the original manufacturer or authorized distributors?

All 2SB1229S-AA 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 2SB1229S-AA meets industry standards.

7.What is the process for return or replacement of 2SB1229S-AA?

All 2SB1229S-AA units undergo pre-shipment inspection (PSI). If there is an issue with 2SB1229S-AA, 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 2SB1229S-AA part is unused and in its original packaging.

Return procedure for 2SB1229S-AA:

1.Submit a request within 90 days.

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

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