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

STMicroelectronics STPSA92-AP

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

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Part No.:: STPSA92-AP

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: STPSA92-AP.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

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

For engineers reviewing the STPSA92-AP datasheet, STPSA92-AP pinout, STPSA92-AP application, or STPSA92-AP equivalent, key selection criteria include verified high-voltage blocking (−300 V V_CEO), DC current gain (h_FE ≥ 25 at I_C = −1 mA), saturation voltage (V_CE(sat) ≤ −0.5 V), thermal resistance (R_thj-amb = 200 °C/W), and TO-92 through-hole mechanical compatibility.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration and supports high-voltage switching and linear amplification up to 50 MHz (f_T). Its breakdown ratings (V_CBO, V_CEO, V_EBO) are symmetrically specified for negative polarity operation, confirming suitability for high-side switching and analog signal inversion in legacy telephony and CRT display systems.

The device features low leakage (I_CBO ≤ −100 nA at V_CB = −200 V), tight C_CEO = 50 pF at V_CE = −20 V, and pulsed-rated saturation parameters-enabling reliable use in intermittent load control and pulse-width modulated current sources where thermal cycling is constrained.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−300 V: Sustains full collector-emitter reverse bias without avalanche conduction in open-base condition.
I_C	−0.5 A: Continuous DC collector current rating defines maximum steady-state load drive capability.
P_tot	625 mW at T_C = 25 °C: Maximum power dissipation under controlled case temperature; derates linearly above 25 °C.
h_FE	25–40: DC current gain range across I_C = −1 to −30 mA ensures predictable base drive requirements in switching and amplification.
f_T	50 MHz: Transition frequency confirms usable bandwidth for RGB video signal amplification and dial-pulse shaping.
C_CEO	50 pF at V_CE = −20 V: Collector-emitter capacitance impacts high-frequency response and switching speed in video and telecom circuits.
R_thj-amb	200 °C/W: Junction-to-ambient thermal resistance determines required PCB copper area and airflow for safe operation.

Pinout & Package

STPSA92-AP is housed in a standard TO-92 plastic package with three leads arranged in linear order (Emitter–Base–Collector, viewed from flat side with leads down). The package supports through-hole mounting and meets JEDEC TO-92 mechanical dimensions including lead pitch (P2 = 6.35 mm), body height (H = 18.5–20.5 mm), and lead diameter (d = 0.48 mm).

Pin/Terminal	Circuit Role	Design Meaning
Lead 1 (left)	Emitter	Current sink terminal; connects to ground or common return path in PNP high-side switch configurations.
Lead 2 (center)	Base	Control input; requires negative base current relative to emitter to turn on; typical I_B = −2 mA for I_C = −20 mA.
Lead 3 (right)	Collector	High-voltage output node; rated for −300 V reverse bias; connects to load supply rail in cathode driver applications.

Key Features

Feature	Design Value
High-voltage blocking	V_CEO = V_CBO = −300 V enables direct interface with −200 V CRT anode supplies and telephone line ringing voltages.
Low saturation voltage	V_CE(sat) ≤ −0.5 V at I_C = −20 mA minimizes power loss and heating during active conduction in hook-switch circuits.
Stable gain over current range	h_FE remains ≥25 from I_C = −1 mA to −30 mA, simplifying base resistor design across operating conditions.
Low leakage current	I_CBO ≤ −100 nA at V_CB = −200 V ensures minimal standby current in always-on telephone interface stages.
TO-92 mechanical standardization	Compatible with legacy wave-soldering fixtures and automated insertion equipment used in telecom and display manufacturing.

Applications

RGB Video Cathode Driver

Telephone Hook-Switch Control

Use Scenario: Driving red/green/blue cathodes in CRT-based monitors and projectors requiring precise current regulation at high reverse voltage.

IC Role / Device Role / Timing Role: PNP high-side current source controlling electron beam intensity via cathode current modulation.

Use Value: −300 V V_CEO withstands CRT anode potential swings; 50 MHz f_T supports pixel-rate bandwidth without phase lag.

Use Scenario: Controlling loop closure and disconnection in PSTN telephone line interface circuits during off-hook and on-hook states.

IC Role / Device Role / Timing Role: High-voltage PNP switch enabling/disabling DC loop current under microcontroller or logic-level control.

Use Value: Low V_CE(sat) reduces heat generation during sustained off-hook operation; −300 V rating accommodates 90 V AC ringing transients.

Dialer Pulse Generation

Legacy Telecom Line Interface

Use Scenario: Generating rotary-dial pulse trains by interrupting DC loop current in electromechanical telephone systems.

IC Role / Device Role / Timing Role: Fast-switching PNP transistor acting as current-interrupting element synchronized to dial rotation timing.

Use Value: 50 pF C_CEO limits capacitive feedthrough during pulse edges; pulsed I_CM = −0.6 A supports peak dial current demands.

Use Scenario: Providing isolation and level translation between low-voltage logic controllers and high-voltage telephone line signaling circuits.

IC Role / Device Role / Timing Role: Voltage-level translator and current buffer interfacing MCU GPIOs to −48 V tip/ring lines.

Use Value: −5 V V_EBO allows safe base-emitter reverse bias during line fault conditions; TO-92 footprint eases integration into space-constrained line cards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA92	Identical V_CEO/V_CBO (−300 V), same TO-92 package, but h_FE min = 25 at I_C = −10 mA (vs. STPSA92-AP's 25 at −1 mA).	Slightly higher base drive requirement at low currents; otherwise interchangeable in video and telecom designs.	Select when sourcing flexibility is prioritized and h_FE consistency at sub-mA bias is not critical.
PN2907A	Lower V_CEO = −60 V, lower P_tot = 400 mW, TO-92 compatible but not high-voltage rated.	Unsuitable for CRT or ringing-voltage applications; limited to low-voltage switching and general-purpose amplification.	Only consider for non-high-voltage legacy replacements where −300 V rating is unnecessary.

Compared with MPSA92 and PN2907A, STPSA92-AP delivers superior high-voltage robustness and tighter low-current h_FE specification-making it the only choice for CRT cathode drivers and telephone line interface circuits exposed to −300 V transients.

Availability

STPSA92-AP is available at Aetrix Electronics and suitable for RGB video amplifier circuits, telephone wireline interface modules, and legacy telecom dialer designs requiring stable component supply and long-term obsolescence management support.

Supply support for STPSA92-AP 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-AP belongs to ST's legacy small-signal bipolar transistor product line, engineered specifically for high-reliability, high-voltage analog and switching functions in telecommunications and display electronics.

FAQ

Is STPSA92-AP still in active production?

No-STPSA92-AP is marked "Obsolete Product(s)" in the official STMicroelectronics preliminary data sheet dated February 2003. Aetrix Electronics maintains legacy inventory and offers cross-reference support, but new design-ins should verify long-term supply chain viability with alternative qualified parts.

What is the difference between STPSA92 and STPSA92-AP?

STPSA92 is supplied in bulk packaging; STPSA92-AP uses ammopack (tape-and-reel compatible carrier tape) for automated assembly. Both share identical electrical specifications, TO-92 mechanical form factor, and marking "PSA92", differing only in shipment format and reel quantity.

Can STPSA92-AP replace MPSA92 in existing designs?

Yes-STPSA92-AP is electrically and mechanically compatible with MPSA92: same pinout, voltage/current ratings, and TO-92 footprint. Minor h_FE test condition differences do not affect functional interchangeability in video amplifier or hook-switch applications.

What is the maximum safe operating temperature for STPSA92-AP?

The maximum operating junction temperature is 150 °C, with storage temperature ranging from −65 °C to +150 °C. Derating begins at T_C > 25 °C per R_thj-amb = 200 °C/W; sustained operation above 125 °C junction requires thermal analysis of PCB copper area and ambient airflow.

STPSA92-AP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Box (TB)

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-92AP

STPSA92-AP FAQ

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

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

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

3.What payment methods are accepted for STPSA92-AP?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPSA92-AP?

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

Once your STPSA92-AP 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-AP?

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

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

All STPSA92-AP 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-AP meets industry standards.

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

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

Return procedure for STPSA92-AP:

1.Submit a request within 90 days.

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

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