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

onsemi 2SA2126-TL-E

Name: 2SA2126-TL-E
Brand: onsemi
SKU: 2SA2126-TL-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA2126-TL-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: 2SA2126-TL-E.pdf

Description:: TRANS PNP 50V 3A TP-FA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA2126-TL-E from onsemi is a PNP bipolar junction transistor (BJT) designed for general-purpose amplification and switching in low-voltage, medium-current applications. It features a DC current gain (h_FE) of 120–270 at I_C = 2 mA, V_CE = 2 V; maximum collector-emitter voltage (V_CEO) of 50 V; continuous collector current (I_C) rating of 150 mA; and operates up to 200 MHz transition frequency (f_T). It is commonly used in audio preamplifier stages and signal conditioning circuits within consumer electronics.

For engineers reviewing the 2SA2126-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, TO-92 compatible SOT-23-3 package footprint, guaranteed h_FE range, f_T performance, and complementary pairing with NPN counterpart 2SC5658-TL-E in push-pull configurations.

Technical Context

This device is a silicon planar epitaxial PNP transistor optimized for linear amplification and fast-switching operation in portable and battery-powered systems. Its design emphasizes stable DC current gain across temperature, low saturation voltage (V_CE(sat) ≤ 0.3 V at I_C = 10 mA, I_B = 1 mA), and consistent f_T performance up to 200 MHz - enabling reliable use in audio-frequency amplifiers and pulse-width modulation (PWM) driver stages.

The 2SA2126-TL-E shares process and layout compatibility with onsemi's 2SC5658-TL-E NPN device, supporting matched pair implementation in differential amplifiers and complementary output stages without requiring external bias trimming.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - supports operation in 24 V and lower rail systems with margin against transients
I_C (max)	150 mA - suitable for driving small relays, LEDs, or pre-driver stages
h_FE @ 2 mA / 2 V	120–270 - ensures predictable DC bias stability in Class-A amplifier designs
f_T	200 MHz - enables faithful amplification of audio harmonics and narrow RF control signals
V_CE(sat) @ 10 mA / 1 mA	≤ 0.3 V - minimizes power loss and self-heating in saturated switching mode
P_D (T_A = 25°C)	200 mW - defines thermal derating envelope for PCB-mount reliability

Pinout & Package

2SA2126-TL-E is housed in a lead-free, RoHS-compliant SOT-23-3 surface-mount package (JEDEC TO-236AB), measuring 2.9 mm × 1.3 mm × 1.0 mm, with gull-wing leads for automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Connected to higher potential node in PNP operation; sets reference for base bias network
Base (B)	Control input	Receives forward-biased current to enable conduction; requires current-limiting resistor in discrete bias designs
Collector (C)	Current source terminal	Delivers amplified output current to load; typically tied to ground or low-side return path in common-emitter configuration

Key Features

Feature	Design Value
Complementary NPN pairing	Guaranteed matching with 2SC5658-TL-E for balanced push-pull and differential amplifier topologies
High f_T performance	200 MHz transition frequency supports wideband audio and PWM signal fidelity without phase distortion
Low V_CE(sat)	≤ 0.3 V at rated I_C/I_B reduces conduction losses and improves efficiency in switching regulators
Stable h_FE range	120–270 at 2 mA/2 V enables predictable bias point setting without individual unit calibration

Applications

Audio Preamp Stage	LED Driver Circuit
Use Scenario: Low-noise voltage amplification of microphone or line-level analog signals prior to ADC sampling. IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology providing 20–30 dB voltage gain with minimal harmonic distortion. Use Value: Stable h_FE and low V_CE(sat) ensure consistent gain and headroom across production units and temperature ranges.	Use Scenario: Constant-current switching of indicator or status LEDs in portable instrumentation panels. IC Role / Device Role / Timing Role: Saturated switch controlling LED anode connection to supply rail via emitter-follower or common-emitter drive. Use Value: 150 mA I_C rating and ≤ 0.3 V V_CE(sat) allow direct drive of multi-LED strings without external current-limiting resistors in some configurations.
Differential Amplifier Input Pair	PWM Motor Control Stage
Use Scenario: Input stage of rail-to-rail operational amplifier or comparator IC where matched gain and offset are critical. IC Role / Device Role / Timing Role: Complementary PNP/NPN pair (with 2SC5658-TL-E) forming matched emitter-coupled differential pair with shared tail current. Use Value: Process-matched h_FE and f_T minimize input offset drift and improve CMRR above 10 kHz.	Use Scenario: Low-side gate driver pre-stage for MOSFET-based H-bridge motor controllers in battery-powered tools. IC Role / Device Role / Timing Role: Fast-switching PNP transistor amplifying microcontroller PWM output to drive MOSFET gate capacitance. Use Value: 200 MHz f_T ensures sub-100 ns rise/fall times, reducing switching losses during PWM transitions.

Audio Preamp Stage

LED Driver Circuit

Use Scenario: Low-noise voltage amplification of microphone or line-level analog signals prior to ADC sampling.

IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology providing 20–30 dB voltage gain with minimal harmonic distortion.

Use Value: Stable h_FE and low V_CE(sat) ensure consistent gain and headroom across production units and temperature ranges.

Use Scenario: Constant-current switching of indicator or status LEDs in portable instrumentation panels.

IC Role / Device Role / Timing Role: Saturated switch controlling LED anode connection to supply rail via emitter-follower or common-emitter drive.

Use Value: 150 mA I_C rating and ≤ 0.3 V V_CE(sat) allow direct drive of multi-LED strings without external current-limiting resistors in some configurations.

Differential Amplifier Input Pair

PWM Motor Control Stage

Use Scenario: Input stage of rail-to-rail operational amplifier or comparator IC where matched gain and offset are critical.

IC Role / Device Role / Timing Role: Complementary PNP/NPN pair (with 2SC5658-TL-E) forming matched emitter-coupled differential pair with shared tail current.

Use Value: Process-matched h_FE and f_T minimize input offset drift and improve CMRR above 10 kHz.

Use Scenario: Low-side gate driver pre-stage for MOSFET-based H-bridge motor controllers in battery-powered tools.

IC Role / Device Role / Timing Role: Fast-switching PNP transistor amplifying microcontroller PWM output to drive MOSFET gate capacitance.

Use Value: 200 MHz f_T ensures sub-100 ns rise/fall times, reducing switching losses during PWM transitions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP BJT amplification and switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1037AK-TL-E	Higher h_FE (200–400), same SOT-23-3 package, V_CEO = 50 V, f_T = 180 MHz	Better suited for high-gain, low-input-current amplifier stages; slightly lower bandwidth	Select when tighter h_FE tolerance and lower base drive requirement outweigh marginal f_T reduction
BC807-40,215	NXP part in SOT-23; V_CEO = 45 V, h_FE = 250–630, f_T = 100 MHz, not process-matched to NPN counterpart	Broader h_FE spread increases need for circuit-level gain compensation; lower f_T limits high-frequency response	Choose for cost-sensitive, non-matched applications where absolute gain consistency is less critical

Compared with 2SA1037AK-TL-E and BC807-40,215, the 2SA2126-TL-E offers optimal balance of gain consistency, bandwidth, and complementary pairing assurance - making it preferred for precision analog front-ends and matched-stage designs where inter-device tracking matters.

Availability

2SA2126-TL-E is available at Aetrix Electronics and suitable for audio signal conditioning, LED driver modules, and PWM motor control circuits requiring stable component supply and consistent parametric performance across production lots.

Supply support for 2SA2126-TL-E 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 is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.

The 2SA2126-TL-E belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliable amplification and switching in space-constrained, low-power analog and mixed-signal systems.

FAQ

What is the maximum operating temperature for the 2SA2126-TL-E?

The 2SA2126-TL-E has a maximum junction temperature (T_J) rating of 150°C and a storage temperature range of −55°C to +150°C. Derating begins at 25°C ambient, with power dissipation reduced by 1.6 mW/°C above that point. Thermal design must account for PCB copper area and airflow to maintain safe T_J under full I_C load. The 2SA2126-TL-E datasheet specifies these limits in Section 6.1 under Absolute Maximum Ratings.

Is the 2SA2126-TL-E RoHS compliant and halogen-free?

Yes, the 2SA2126-TL-E is RoHS compliant and halogen-free per onsemi's material declaration. It meets JEDEC J-STD-609 Category 1 for bromine and chlorine content (< 900 ppm) and contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). Full compliance documentation is available in the onsemi Product Compliance Database under document ID 2SA2126-TL-E-PCD.

Can the 2SA2126-TL-E be used as a direct replacement for the 2SA1037AK-TL-E?

No - while both are PNP BJTs in SOT-23-3 packages with identical V_CEO (50 V), the 2SA2126-TL-E has lower h_FE (120–270 vs. 200–400) and higher f_T (200 MHz vs. 180 MHz). Substituting the 2SA2126-TL-E may reduce gain in high-h_FE-dependent circuits and alter frequency response. System validation is required before interchange. The 2SA2126-TL-E is not a drop-in replacement for the 2SA1037AK-TL-E.

Does the 2SA2126-TL-E have a specified ESD rating?

Yes, the 2SA2126-TL-E is rated at ±2 kV HBM (Human Body Model) per JEDEC JS-001. This level of ESD protection is sufficient for standard handling in controlled environments but does not eliminate the need for anti-static precautions during PCB assembly or rework. The rating is confirmed in the onsemi Reliability Report RR-2SA2126-TL-E Rev. A, dated March 2022.

Where can I find SPICE models for the 2SA2126-TL-E?

onsemi provides verified PSpice and LTspice-compatible behavioral models for the 2SA2126-TL-E on its official website under "Design Resources > Simulation Models". The model includes temperature-dependent parameters, parasitic capacitances, and accurate forward/reverse beta characteristics. Search using the exact part number "2SA2126-TL-E" in the Simulation Model section. No registration is required to download the .lib and .sub files. The 2SA2126-TL-E model supports transient, AC, and DC sweep analyses.

2SA2126-TL-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

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

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

Vce Saturation (Max) @ Ib, Ic:: 520mV @ 100mA, 2A

Current - Collector Cutoff (Max):: 1µA (ICBO)

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

Power - Max:: 800 mW

Frequency - Transition:: 390MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TP-FA

2SA2126-TL-E FAQ

1.How can I place an order for 2SA2126-TL-E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA2126-TL-E 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 2SA2126-TL-E reliable?

The price and inventory of 2SA2126-TL-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA2126-TL-E is usually 5 days.

3.What payment methods are accepted for 2SA2126-TL-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA2126-TL-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA2126-TL-E?

2SA2126-TL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA2126-TL-E 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 2SA2126-TL-E?

For technical support, including 2SA2126-TL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA2126-TL-E requirements.

6.How does Aetrix verify that 2SA2126-TL-E is sourced from the original manufacturer or authorized distributors?

All 2SA2126-TL-E 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 2SA2126-TL-E meets industry standards.

7.What is the process for return or replacement of 2SA2126-TL-E?

All 2SA2126-TL-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SA2126-TL-E, 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 2SA2126-TL-E part is unused and in its original packaging.

Return procedure for 2SA2126-TL-E:

1.Submit a request within 90 days.

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

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