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

STMicroelectronics 2STA1837

Name: 2STA1837
Brand: STMicroelectronics
SKU: 2STA1837
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STA1837

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: 2STA1837.pdf

Description:: TRANS PNP 230V 1A TO-220FP

Quantity:: RFQ Add To RFQ list

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Inventory:8,179

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Product details

Overview

2STA1837 from STMicroelectronics is a PNP power bipolar transistor fabricated with PB-HDC technology, delivering high breakdown voltage (V_CEO = −230 V), high transition frequency (f_T = 70 MHz typ.), and DC current gain (h_FE = 100–320 at I_C = −0.1 A). It serves as a high-voltage output or driver stage in audio amplifier circuits.

For engineers reviewing the 2STA1837 datasheet, 2STA1837 pinout, 2STA1837 application, or 2STA1837 equivalent, key selection criteria include verified V_CEO/V_CBO rating, thermal resistance (R_thJC = 6.25 °C/W), saturation voltage (V_CE(sat) = −1 V @ I_C = −0.5 A), and TO-220FP package compatibility for heatsink-mounted power stages.

Technical Context

This device operates as a linear PNP power switch with complementary pairing to the NPN 2STC4793, enabling push-pull audio output stages. Its PB-HDC process ensures improved gain linearity and stable f_T across operating conditions.

Absolutely rated for V_CEO and V_CBO up to −230 V with I_C = −1 A continuous and I_CM = −2 A peak, it supports Class AB amplifier topologies requiring low distortion and robust safe operating area (SOA) at T_C = 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−230 V - Maximum collector-emitter blocking voltage under open-base condition; defines high-voltage capability in output stage switching
f_T	70 MHz typ. - Transition frequency at I_C = −0.1 A, V_CE = −10 V; enables stable audio bandwidth up to ~10 MHz before gain roll-off
h_FE	100–320 - DC current gain range at I_C = −0.1 A, V_CE = −5 V; supports predictable biasing in linear amplifier designs
R_thJC	6.25 °C/W max - Junction-to-case thermal resistance; determines minimum heatsink requirement for 20 W dissipation at T_C = 25 °C
V_CE(sat)	−1 V @ I_C = −0.5 A, I_B = −50 mA - Low saturation voltage reduces conduction loss and improves efficiency in Class AB output stages
P_TOT	20 W @ T_C = 25 °C - Total power dissipation limit; sets thermal design boundary for continuous operation with active cooling

Pinout & Package

Package: TO-220FP (fully insulated plastic case with metal tab, single mounting hole, vertical lead orientation). Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (tab-connected).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Current exit terminal for PNP operation	Connected to signal ground or negative rail in common-emitter amplifier configurations
Pin 2 (Base)	Control input for minority-carrier injection	Receives bias current to regulate collector current; requires current-limiting resistor in discrete driver stages
Pin 3 (Collector)	Main current-carrying terminal (tab-connected)	Electrically tied to metal tab; must be isolated from heatsink unless circuit reference permits direct connection

Key Features

Feature	Design Value
High V_CEO rating	−230 V enables use in ±100 V rail audio amplifiers without cascading or snubbing
Gain linearity	Stable h_FE vs. I_C due to PB-HDC process reduces harmonic distortion in linear amplification
Complementary pairing	Matched performance with 2STC4793 allows symmetrical push-pull output stage design
TO-220FP insulation	Plastic body isolates collector tab from heatsink, simplifying mechanical mounting and safety compliance

Applications

Audio Power Amplifier

Drive Stage Amplifier

Use Scenario: Final output stage in discrete Class AB hi-fi amplifiers delivering 20–50 W into 4–8 Ω loads.

IC Role / Device Role / Timing Role: PNP power switch in complementary pair with NPN counterpart; handles negative half-cycle current delivery.

Use Value: High V_CEO and low V_CE(sat) minimize clipping and conduction loss, preserving dynamic headroom and thermal margin.

Use Scenario: Voltage/current gain stage driving output transistors in multi-stage amplifier architectures.

IC Role / Device Role / Timing Role: Medium-power PNP driver providing base current to output devices while maintaining linearity and bandwidth.

Use Value: 70 MHz f_T ensures adequate phase margin and slew rate for full-audio-band signal fidelity without instability.

High-Voltage Linear Regulator

Industrial Signal Conditioning

Use Scenario: Pass element in negative-output linear regulators supplying −15 V to −48 V rails for op-amp biasing or sensor interfaces.

IC Role / Device Role / Timing Role: Series pass transistor regulating output voltage via emitter-follower configuration.

Use Value: −230 V V_CEO provides ample margin against transient overvoltage, improving reliability in unregulated AC/DC front-ends.

Use Scenario: Current-source biasing or level-shifting in industrial analog signal chains operating in noisy environments.

IC Role / Device Role / Timing Role: Precision current source or active load in differential amplifier front-ends.

Use Value: Tight h_FE spread (100–320) and low ICBO (≤ −1 µA) ensure stable quiescent current and minimal drift over temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955	V_CEO = −70 V, f_T = 3 MHz, R_thJC = 5 °C/W, TO-220 package	Limited to ≤ ±40 V rails; unsuitable for high-voltage audio or regulator use	Select when lower voltage, higher thermal efficiency, and cost sensitivity outweigh bandwidth and breakdown needs
BD711	V_CEO = −100 V, h_FE = 25–250, TO-126 package, no insulated tab	Lower voltage rating and non-isolated collector require additional insulation in heatsink mounting	Prefer for compact PCB layouts where voltage stress is constrained and mechanical isolation is managed externally

Compared with MJD2955 and BD711, the 2STA1837 uniquely supports ≥±100 V rail systems with verified 70 MHz bandwidth and fully insulated TO-220FP packaging-critical for high-fidelity audio output stages and robust industrial regulators where SOA and thermal safety are prioritized.

Availability

2STA1837 is available at Aetrix Electronics and suitable for audio power amplifiers, high-voltage linear regulators, industrial signal conditioning circuits, and drive-stage amplifier modules requiring stable component supply and long-lifecycle support.

Supply support for 2STA1837 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and automotive-grade ICs.

The 2STA1837 belongs to ST's legacy power bipolar transistor family, engineered specifically for high-fidelity audio and industrial linear power applications demanding high breakdown voltage, gain stability, and thermal robustness.

FAQ

Is the 2STA1837 still in active production?

No-the 2STA1837 is marked "Obsolete Product(s)" in its official ST documentation (Doc ID 15402 Rev 2). While not actively manufactured, Aetrix Electronics maintains limited legacy stock with full traceability and offers engineering support for legacy system maintenance and repair programs.

Can the 2STA1837 be used as a direct replacement for the 2N2955?

No-it is not a drop-in replacement. The 2STA1837 has −230 V V_CEO versus −70 V for the 2N2955, different h_FE range (100–320 vs. 20–100), and TO-220FP insulation absent in the metal-can 2N2955. Circuit revalidation is required for voltage, gain, and thermal interface changes.

What is the significance of the "PB-HDC" technology cited in the datasheet?

PB-HDC (Power Bipolar High-Density Current) is ST's proprietary fabrication process that increases current density while preserving gain linearity and SOA. It enables tighter h_FE distribution and reduced second-harmonic distortion-key for high-fidelity audio output stages where waveform fidelity is critical.

Does the TO-220FP package require electrical isolation from the heatsink?

Yes-the TO-220FP variant features a fully insulated plastic body with collector internally connected to the metal tab. To prevent short-circuiting, the tab must be electrically isolated from the heatsink using mica washers or silicone pads unless the circuit explicitly references the collector to chassis ground.

2STA1837 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 230 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 50mA, 500mA

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

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

Power - Max:: 20 W

Frequency - Transition:: 70MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

2STA1837 FAQ

1.How can I place an order for 2STA1837 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STA1837 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 2STA1837 reliable?

The price and inventory of 2STA1837 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STA1837 is usually 5 days.

3.What payment methods are accepted for 2STA1837?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STA1837 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STA1837?

2STA1837 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STA1837 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 2STA1837?

For technical support, including 2STA1837 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STA1837 requirements.

6.How does Aetrix verify that 2STA1837 is sourced from the original manufacturer or authorized distributors?

All 2STA1837 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 2STA1837 meets industry standards.

7.What is the process for return or replacement of 2STA1837?

All 2STA1837 units undergo pre-shipment inspection (PSI). If there is an issue with 2STA1837, 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 2STA1837 part is unused and in its original packaging.

Return procedure for 2STA1837:

1.Submit a request within 90 days.

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

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