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

STMicroelectronics STPSA92

Name: STPSA92
Brand: STMicroelectronics
SKU: STPSA92
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPSA92

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: STPSA92.pdf

Description:: TRANS PNP 300V 0.5A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:355

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Product details

Overview

STPSA92 from STMicroelectronics is a silicon epitaxial planar PNP high-voltage transistor in TO-92 package, rated for V_CBO = −300 V, V_CEO = −300 V, I_C = −0.5 A, and P_tot = 625 mW at T_C = 25 °C. It serves as a high-voltage switching and amplification device in RGB cathode current control and telephone wireline hook-switch circuits.

For engineers reviewing the STPSA92 datasheet, STPSA92 pinout, STPSA92 application, or STPSA92 equivalent, key selection criteria include verified −300 V breakdown ratings, −0.5 A DC collector current capability, TO-92 through-hole mechanical compatibility, and confirmed complementary pairing with STPSA42 for push-pull designs.

Technical Context

This PNP transistor employs a planar epitaxial structure optimized for high-voltage blocking and stable gain across −1 mA to −30 mA operating range. Its h_FE of 25–40 (at V_CE = −10 V) and f_T = 50 MHz support video-frequency amplification and fast-switching telephony functions.

Thermal resistance R_thj-amb = 200 °C/W and R_thj-case = 83.3 °C/W define its power derating envelope under natural convection. The −5 V V_EBO rating constrains base drive design in high-side switch configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	−300 V: Maximum reverse voltage sustainable between collector and base with emitter open - enables use in high-voltage line interface stages.
V_CEO	−300 V: Sustains full collector-emitter blocking without base bias - suitable for unclamped inductive loads in hook-switch drivers.
I_C	−0.5 A: Continuous DC collector current rating - supports steady-state RGB cathode current up to 500 mA in CRT display drivers.
h_FE	25–40 @ I_C = −1 to −30 mA: Moderate, stable DC current gain - simplifies base resistor design for predictable saturation in switching applications.
f_T	50 MHz: Transition frequency at I_C = −10 mA, V_CE = −20 V - sufficient for RGB video bandwidth and dialer tone generation (≤16 kHz).
C_CEO	50 pF @ V_CE = −20 V, f = 1 MHz - low output capacitance minimizes signal delay in high-speed on/off control paths.
P_tot	625 mW @ T_C = 25 °C: Total power dissipation limit - requires heatsinking or derating above 25 °C ambient for sustained operation.

Pinout & Package

TO-92 package: 3-lead through-hole plastic case with standard lead spacing (P2 = 6.35 mm), body height 18.5–20.5 mm, and EIAJ-defined pin assignment.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current source terminal for PNP operation	Connected to positive rail in high-side switch; must withstand −5 V reverse bias relative to base.
Base (B)	Control input for minority-carrier injection	Requires negative current drive (−2 mA typical for saturation); sensitive to ESD due to low V_EBO.
Collector (C)	Current sink terminal	Highest voltage node in circuit; rated for −300 V reverse bias - used directly in telephone line interface.

Key Features

Feature	Design Value
High-voltage blocking	−300 V V_CBO/V_CEO enables direct connection to −200 V telephone line potentials without external clamping.
Complementary pairing	Factory-matched performance with STPSA42 (NPN) allows symmetrical push-pull amplifier and switch designs.
Video-bandwidth capability	50 MHz f_T and 50 pF C_CEO support stable small-signal gain up to ~10 MHz - adequate for analog RGB timing.
Through-hole reliability	TO-92 mechanical dimensions (L = 12.7–15.5 mm, W = 4.45–4.95 mm) ensure robust solder joint integrity in industrial PCB assemblies.

Applications

RGB Cathode Current Control

Telephone Hook Switch

Use Scenario: Regulating electron beam current in CRT-based RGB display systems to maintain color fidelity and brightness uniformity.

IC Role / Device Role / Timing Role: PNP high-side switch controlling cathode current path to ground; operates in linear or saturated mode depending on video signal amplitude.

Use Value: −300 V V_CEO rating prevents breakdown during flyback-induced voltage spikes; h_FE stability ensures consistent current mirroring across scan lines.

Use Scenario: Detecting and controlling off-hook/on-hook state in analog telephone handsets and PBX line cards.

IC Role / Device Role / Timing Role: High-voltage PNP switch isolating ringing detection circuitry from −48 V tip/ring line during idle state.

Use Value: −300 V V_CBO withstands peak ringing voltages (up to −120 V) without avalanche conduction; low ICBO (−100 nA) minimizes standby leakage.

Dialer Tone Generation

Line Interface Protection

Use Scenario: Generating DTMF tones via switched-capacitor or oscillator-driven current sources in rotary/push-button telephones.

IC Role / Device Role / Timing Role: Current-source driver for tone-generating LC or crystal networks; biased in active region for harmonic-rich output.

Use Value: 50 MHz f_T preserves tone waveform fidelity up to 3.5 kHz; −0.5 V V_CE(sat) reduces power loss in battery-powered units.

Use Scenario: Providing overvoltage clamping and transient suppression at telephone line entry points in residential gateways.

IC Role / Device Role / Timing Role: Standby-mode protection element conducting only during surge events; used with Zener or MOV in series-shunt configuration.

Use Value: Low C_CEO (50 pF) avoids signal attenuation on voice band (300–3400 Hz); R_thj-amb = 200 °C/W permits self-heating limited operation during short surges.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955	TO-220 package, higher P_tot = 115 W, V_CEO = −70 V - lower voltage rating but higher power handling.	Not suitable for −300 V line interfaces; better for high-current, low-voltage motor drivers.	Select when thermal management allows larger package and voltage requirements are ≤ −70 V.
BCV61	SOT-23 package, V_CEO = −60 V, I_C = −100 mA - surface-mount, lower voltage/current, no TO-92 footprint compatibility.	Only viable for low-power logic-level switching; incompatible with legacy through-hole telephone hardware.	Choose only for space-constrained PCBs where −300 V rating is unnecessary and rework is acceptable.

Compared with MJD2955 and BCV61, STPSA92 uniquely balances −300 V blocking, TO-92 through-hole fit, and −0.5 A current in a single legacy-compatible device - making it irreplaceable for field-replaceable telephone line cards and CRT video boards requiring exact mechanical and electrical equivalence.

Availability

STPSA92 is available at Aetrix Electronics and suitable for video amplifier circuits, telephone wireline interfaces, and legacy CRT display subsystems requiring stable component supply and long-term obsolescence mitigation.

Supply support for STPSA92 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The STPSA92 belongs to ST's legacy bipolar transistor product line, engineered specifically for high-voltage analog signal conditioning and telephony infrastructure applications where reliability under sustained −300 V stress is mandatory.

FAQ

Is STPSA92 still in active production?

No - STPSA92 is marked "Obsolete Product(s)" in the official datasheet (Rev. 2, Feb 2003). However, Aetrix Electronics maintains legacy inventory with full traceability and offers extended lifecycle support including cross-reference validation and controlled distribution for critical repair programs.

What is the correct pinout orientation for STPSA92 in TO-92 package?

With flat side facing outward and leads pointing down, the left-to-right pin order is Emitter (E), Base (B), Collector (C). This matches JEDEC TO-92 standard orientation and is confirmed by ST's mechanical drawings (page 3, "TO-92 MECHANICAL DATA" section).

Can STPSA92 be used as a direct replacement for STPSA42?

No - STPSA92 is PNP while STPSA42 is NPN; they are complementary types, not substitutes. Swapping them would invert logic polarity and likely cause circuit failure. They are intended for paired use in push-pull or differential configurations, not interchange.

Does STPSA92 require a heatsink in typical applications?

Not under standard conditions: at 25 °C ambient and ≤300 mW dissipation, the TO-92 package's R_thj-amb = 200 °C/W results in <60 °C junction rise - within safe limits. Heatsinking becomes necessary only above 150 mW continuous dissipation or in >50 °C ambient environments.

STPSA92 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Bag

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 300 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 2mA, 20mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 30mA, 10V

Power - Max:: 625 mW

Frequency - Transition:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

STPSA92 FAQ

1.How can I place an order for STPSA92 through Aetrix?

Please submit a Request for Quotation (RFQ) for STPSA92 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 STPSA92 reliable?

The price and inventory of STPSA92 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPSA92 is usually 5 days.

3.What payment methods are accepted for STPSA92?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPSA92 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPSA92?

STPSA92 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPSA92 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 STPSA92?

For technical support, including STPSA92 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPSA92 requirements.

6.How does Aetrix verify that STPSA92 is sourced from the original manufacturer or authorized distributors?

All STPSA92 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 STPSA92 meets industry standards.

7.What is the process for return or replacement of STPSA92?

All STPSA92 units undergo pre-shipment inspection (PSI). If there is an issue with STPSA92, 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 STPSA92 part is unused and in its original packaging.

Return procedure for STPSA92:

1.Submit a request within 90 days.

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

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