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

STMicroelectronics SO692

Name: SO692
Brand: STMicroelectronics
SKU: SO692
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SO692

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: SO692.pdf

Description:: TRANS PNP 300V 0.1A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Inventory:8,329

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Product details

Overview

SO692 from STMicroelectronics is a silicon epitaxial planar PNP high-voltage transistor in SOT-23 package, rated for V_CEO = −300 V, I_C = −100 mA, and P_tot = 310 mW at T_C = 25 °C; used in RGB cathode current control and telephone wireline hook-switch circuits.

For engineers reviewing the SO692 datasheet, SO692 pinout, SO692 application, or SO692 equivalent, key selection criteria include high-voltage PNP switching capability, low saturation voltage (V_CE(sat) ≤ −0.5 V @ −20 mA), h_FE ≥ 25 at −1 mA, and SOT-23 surface-mount compatibility for space-constrained video and telephony interfaces.

Technical Context

This PNP transistor operates with reverse-polarity biasing: collector and emitter terminals handle up to −300 V standoff, enabling direct integration into high-side switching nodes of cathode-driven RGB video amplifiers and telephone line interface circuits where negative rail switching is required.

Its f_T = 50 MHz and C_CBO = 6 pF support stable high-frequency operation in video signal paths, while pulsed ratings (300 µs, ≤2% duty) allow transient overcurrent handling up to −300 mA without thermal runaway under controlled drive conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−300 V: Enables direct connection to high-negative-rail video cathodes or telephone line feed circuits without level-shifting.
I_C	−100 mA continuous: Supports RGB cathode current control across standard CRT monitor resolutions.
V_CE(sat)	−0.5 V @ −20 mA / −2 mA: Minimizes power loss and heating in linear-mode cathode drivers.
h_FE	25–40 @ −1 to −30 mA: Provides predictable DC gain for stable current-source biasing in analog interface stages.
f_T	50 MHz @ −10 mA / −20 V: Ensures adequate bandwidth for baseband video signal amplification (e.g., 15.75 kHz horizontal sync + harmonics).
R_thj-amb	403.2 °C/W on 1 cm² PCB: Requires careful thermal layout for sustained operation above 100 mW dissipation.

Pinout & Package

SOT-23 plastic surface-mount package with 3-terminal configuration: compact footprint (2.8 × 2.5 mm), gull-wing leads, and JEDEC-standard pin assignment.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal	Connected to negative supply rail or cathode return path; handles full load current with −5 V max reverse bias.
2 (Base)	Control input	Receives negative-turn-on current; requires −2 mA drive for full saturation at −20 mA collector load.
3 (Collector)	High-voltage output node	Interfaces directly with −300 V video cathode or telephone line feed; withstands full breakdown voltage when open-circuit.

Key Features

Feature	Design Value
High-voltage PNP structure	−300 V V_CEO rating enables direct cathode switching in legacy RGB video systems without external level shifters.
Low V_CE(sat)	≤ −0.5 V ensures <10 mW conduction loss at −20 mA, critical for thermally constrained SOT-23 video driver layouts.
Stable h_FE across current range	25–40 from −1 mA to −30 mA supports consistent current-source behavior in analog control loops.
High f_T / low C_CBO	50 MHz f_T and 6 pF C_CBO maintain signal integrity in wideband video amplifier feedback paths.

Applications

RGB Video Cathode Driver

Telephone Hook-Switch Interface

Use Scenario: Driving red/green/blue cathodes in CRT monitors requiring precise current regulation at −200 V to −300 V rails.

IC Role / Device Role / Timing Role: High-voltage PNP current switch controlling electron beam intensity via cathode current modulation.

Use Value: −300 V V_CEO eliminates need for cascode or transformer coupling; −0.5 V V_CE(sat) reduces heat generation in densely packed video board layouts.

Use Scenario: Controlling loop closure and dialer signaling in analog telephone line interface cards.

IC Role / Device Role / Timing Role: High-side PNP switch enabling battery-powered hook detection and pulse-dial generation on −48 V telecom lines.

Use Value: −300 V V_CB0 withstands line transients; −5 V V_EB0 allows safe base biasing from microcontroller I/O pins via current-limiting resistors.

Dialer Circuit Transistor

Legacy CRT Monitor Current Source

Use Scenario: Generating pulse-dial signals by rapidly switching −48 V line current in rotary-dial telephone systems.

IC Role / Device Role / Timing Role: Fast-switching PNP transistor activated by MCU GPIO to interrupt line current in timed bursts.

Use Value: 50 MHz f_T ensures clean pulse edges; 300 µs pulsed I_CM = −300 mA accommodates peak dial current surges.

Use Scenario: Providing stable, temperature-compensated cathode current in monochrome or color CRT display subsystems.

IC Role / Device Role / Timing Role: Linear-mode PNP current source biased by feedback network to regulate beam current independent of supply variation.

Use Value: h_FE stability (25–40) across −1 to −30 mA enables accurate current mirroring; R_thj-amb = 403.2 °C/W informs heatsinking requirements for 24/7 operation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCV61	V_CEO = −300 V, I_C = −100 mA, but h_FE min = 100 - higher gain, lower V_CE(sat) (−0.3 V), same SOT-23 package.	Preferred in new designs requiring tighter current regulation; less suitable where gain matching with SO642 (NPN complement) is needed.	Select BCV61 if higher h_FE and lower saturation loss are prioritized over legacy design compatibility.
MMBT3906	V_CEO = −40 V only - insufficient for −300 V video or telecom use; otherwise identical SOT-23 footprint and pinout.	Restricted to low-voltage logic-level switching; cannot replace SO692 in high-voltage applications without circuit redesign.	Use MMBT3906 only in non-high-voltage contexts; not a functional substitute for SO692's primary use cases.

Compared with BCV61 and MMBT3906, SO692 uniquely balances −300 V capability with moderate h_FE and proven reliability in legacy CRT and telecom hardware - making it irreplaceable in field-repair scenarios where exact electrical and thermal behavior must match original design intent.

Availability

SO692 is available at Aetrix Electronics and suitable for RGB video cathode drivers, telephone hook-switch interfaces, dialer circuits, and legacy CRT monitor current sources requiring stable component supply despite its obsolete status.

Supply support for SO692 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The SO692 belongs to ST's legacy high-voltage discrete transistor family, engineered specifically for analog video signal conditioning and telecom line interface applications requiring robust −300 V PNP switching in miniature SOT-23 packages.

FAQ

Is SO692 still in active production?

No - SO692 is marked "Obsolete Product(s)" in the official STMicroelectronics preliminary data sheet dated June 2002. It is no longer manufactured, but Aetrix Electronics maintains limited legacy stock with full traceability and documentation for repair and continuity programs.

Can SO692 be substituted with an NPN transistor like SO642?

SO642 is the complementary NPN type, not a drop-in replacement. SO692 is PNP and intended for high-side switching; SO642 is NPN for low-side configurations. Swapping them requires reversing bias polarity, redesigning drive circuitry, and verifying voltage/current limits - not recommended without full system validation.

What is the maximum safe operating temperature for SO692?

The absolute maximum junction temperature is 150 °C, and storage temperature ranges from −65 °C to +150 °C. Derating is required above 25 °C case temperature: at T_C = 75 °C, maximum allowable power dissipation drops to ~180 mW based on R_thj-amb = 403.2 °C/W and ambient thermal conditions.

Does SO692 require a heatsink in typical applications?

Not for intermittent or low-duty-cycle use, but continuous operation above ~100 mW dissipation requires thermal relief. With R_thj-amb = 403.2 °C/W on a 1 cm² PCB pad, even 150 mW raises junction temperature by ~60 °C above ambient - so copper pour or thermal vias are recommended for sustained video driver or telecom interface operation.

SO692 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 100 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:: 25 @ 30mA, 10V

Power - Max:: 310 mW

Frequency - Transition:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

SO692 FAQ

1.How can I place an order for SO692 through Aetrix?

Please submit a Request for Quotation (RFQ) for SO692 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 SO692 reliable?

The price and inventory of SO692 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SO692 is usually 5 days.

3.What payment methods are accepted for SO692?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SO692 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SO692?

SO692 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SO692 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 SO692?

For technical support, including SO692 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SO692 requirements.

6.How does Aetrix verify that SO692 is sourced from the original manufacturer or authorized distributors?

All SO692 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 SO692 meets industry standards.

7.What is the process for return or replacement of SO692?

All SO692 units undergo pre-shipment inspection (PSI). If there is an issue with SO692, 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 SO692 part is unused and in its original packaging.

Return procedure for SO692:

1.Submit a request within 90 days.

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

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