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

onsemi MPSA92_D74Z

Name: MPSA92_D74Z
Brand: onsemi
SKU: MPSA92_D74Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPSA92_D74Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MPSA92_D74Z.pdf

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

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Product details

Overview

MPSA92_D74Z from Fairchild Semiconductor is a PNP high-voltage general-purpose amplifier transistor in TO-92 radial ammo packaging (EOL code D74Z), rated for 300 V V_CEO, 500 mA I_C, and 625 mW P_D at T_A = 25°C, commonly used in high-voltage switching and linear amplification stages of CRT deflection circuits, relay drivers, and industrial power supply feedback loops.

For engineers reviewing the MPSA92_D74Z datasheet, pinout, applications, or equivalent options, this page delivers verified package configuration (TO-92, emitter-first radial ammo), absolute maximum ratings, DC current gain behavior across temperature, saturation voltage performance at I_C = 20 mA, and validated alternatives with documented thermal and gain trade-offs.

Technical Context

The MPSA92_D74Z implements a silicon PNP bipolar junction structure optimized for high-voltage operation up to 300 V with low leakage (I_CBO ≤ 0.25 µA at V_CB = 200 V) and moderate frequency response (f_T = 50 MHz at I_C = 10 mA, V_CE = 20 V). Its base-emitter saturation voltage is specified at 0.9 V under I_C = 20 mA / I_B = 2.0 mA conditions.

Thermal design relies on R_θJA = 200 °C/W (TO-92 on standard FR-4), enabling operation from –55°C to +150°C junction temperature. The device uses Process 76 and exhibits h_FE = 25–40 across I_C = 1–30 mA at V_CE = 10 V, with collector-base capacitance C_cb = 6.0 pF at V_CB = 20 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	300 V - Supports high-side switching in 200 V+ DC bus applications without breakdown.
I_C (continuous)	500 mA - Sufficient drive capability for medium-power relays and small solenoids.
P_D @ 25°C	625 mW - Requires heatsinking or derating above 25°C ambient (5.0 mW/°C).
h_FE @ I_C = 10 mA	40 - Enables low-base-drive-current operation in linear amplifier configurations.
V_CE(sat)	0.5 V @ I_C = 20 mA, I_B = 2.0 mA - Minimizes conduction loss in saturated-switching mode.
f_T	50 MHz - Suitable for audio-frequency amplification and low-speed switching (<1 MHz).
C_cb	6.0 pF @ V_CB = 20 V - Limits Miller effect in high-gain common-emitter stages.

Pinout & Package

Package: TO-92 radial ammo (EOL code D74Z), flat side facing down, first wire off is collector, adhesive tape on bottom side.

Pin/Terminal	Circuit Role	Design Meaning
Collector (C)	Main current sink terminal	Connected to high-voltage rail in common-emitter switch; requires thermal relief on PCB due to power dissipation.
Base (B)	Control input	Receives negative bias current to turn on PNP; typically driven via resistor from logic-low or op-amp output.
Emitter (E)	Current source reference	Usually tied to positive supply rail; establishes fixed voltage reference for bias network stability.

Key Features

Feature	Design Value
High V_CEO rating	300 V enables direct interface with legacy CRT flyback supplies and industrial 240 VAC-derived rails.
Low I_CBO leakage	≤ 0.25 µA at 200 V ensures stable cutoff in high-impedance bias networks over temperature.
Controlled h_FE spread	25–40 range allows predictable base resistor selection without trimming in production.
TO-92 radial ammo format	D74Z orientation (collector-first, flat-down) supports automated insertion in legacy through-hole assembly lines.
Process 76 fabrication	Ensures consistent BV_EBO ≥ 5.0 V and thermal robustness across manufacturing lots.

Applications

Relay Driver Stage	CRT Horizontal Deflection
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules with microcontroller GPIO. IC Role / Device Role / Timing Role: PNP switch controlling relay coil current path from positive rail to ground. Use Value: 300 V V_CEO margin prevents breakdown during relay coil flyback transients exceeding 100 V.	Use Scenario: Horizontal output stage in analog CRT monitors requiring fast turn-off and high-voltage swing. IC Role / Device Role / Timing Role: High-voltage PNP amplifier shaping sawtooth waveform into deflection yoke. Use Value: 50 MHz f_T and 0.5 V V_CE(sat) support clean 15.734 kHz switching with minimal distortion.
Industrial Power Supply Feedback	High-Voltage Bias Generator
Use Scenario: Isolated error amplifier output stage in 48 V telecom rectifiers using optocoupler feedback. IC Role / Device Role / Timing Role: Linear amplifier modulating base of main pass transistor via TL431 reference. Use Value: Stable h_FE vs. temperature (–40°C to 125°C) maintains regulation accuracy across operating range.	Use Scenario: Generating stabilized –100 V bias for photomultiplier tube anodes in analytical instrumentation. IC Role / Device Role / Timing Role: Series-pass regulator element in discrete negative high-voltage supply. Use Value: 300 V VCBO rating accommodates reverse-biased collector-base junction during startup overshoot.

Relay Driver Stage

CRT Horizontal Deflection

Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules with microcontroller GPIO.

IC Role / Device Role / Timing Role: PNP switch controlling relay coil current path from positive rail to ground.

Use Value: 300 V V_CEO margin prevents breakdown during relay coil flyback transients exceeding 100 V.

Use Scenario: Horizontal output stage in analog CRT monitors requiring fast turn-off and high-voltage swing.

IC Role / Device Role / Timing Role: High-voltage PNP amplifier shaping sawtooth waveform into deflection yoke.

Use Value: 50 MHz f_T and 0.5 V V_CE(sat) support clean 15.734 kHz switching with minimal distortion.

Industrial Power Supply Feedback

High-Voltage Bias Generator

Use Scenario: Isolated error amplifier output stage in 48 V telecom rectifiers using optocoupler feedback.

IC Role / Device Role / Timing Role: Linear amplifier modulating base of main pass transistor via TL431 reference.

Use Value: Stable h_FE vs. temperature (–40°C to 125°C) maintains regulation accuracy across operating range.

Use Scenario: Generating stabilized –100 V bias for photomultiplier tube anodes in analytical instrumentation.

IC Role / Device Role / Timing Role: Series-pass regulator element in discrete negative high-voltage supply.

Use Value: 300 V VCBO rating accommodates reverse-biased collector-base junction during startup overshoot.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBTA92	SOT-23 package (smaller footprint, higher R_θJA = 357 °C/W), same electrical specs except P_D = 350 mW.	Preferred for space-constrained PCBs where thermal management permits lower power dissipation.	Select MMBTA92 only when board area is critical and peak I_C remains below 100 mA continuous.
PZTA92	SOT-223 package (exposed thermal pad), P_D = 1,000 mW, R_θJA = 125 °C/W, identical V_CEO/I_C/h_FE.	Required for high-duty-cycle linear operation (>300 mW average dissipation) with forced-air or heatsink cooling.	Choose PZTA92 when thermal budget exceeds 400 mW and TO-92 layout cannot accommodate heatsinking.

Compared with MPSA92_D74Z, MMBTA92 trades package size for reduced thermal capability, while PZTA92 delivers 60% higher power handling in a surface-mount format-neither is pin-compatible, but all three share identical transistor die characteristics and biasing requirements.

Availability

MPSA92_D74Z is available at Aetrix Electronics and suitable for relay driver stages, CRT deflection circuits, industrial power supply feedback loops, and high-voltage bias generators requiring stable component supply across extended lifecycle programs.

Supply support for MPSA92_D74Z 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

Fairchild Semiconductor (now part of ON Semiconductor) is a legacy analog and discrete semiconductor manufacturer known for robust bipolar, MOSFET, and optoelectronic products targeting industrial and consumer systems.

The MPSA92_D74Z belongs to Fairchild's general-purpose high-voltage PNP transistor family designed for reliability-critical linear amplification and switching in legacy and retrofit equipment.

FAQ

What is the pin configuration of MPSA92_D74Z in its TO-92 radial ammo packaging?

The MPSA92_D74Z uses TO-92 radial ammo packaging with EOL code D74Z: flat side faces down, first wire off is collector (C), second is base (B), third is emitter (E), and adhesive tape is applied to the bottom side. This matches Figure 3.0 "FIRST WIRE OFF IS COLLECTOR" in the Fairchild packaging specification.

Does MPSA92_D74Z support operation at elevated ambient temperatures?

Yes, MPSA92_D74Z is rated for junction temperatures from –55°C to +150°C. At 100°C ambient, its power dissipation must be derated to 250 mW (625 mW – 5.0 mW/°C × 75°C), and thermal design must account for R_θJA = 200 °C/W on standard FR-4 PCB.

How does the h_FE of MPSA92_D74Z vary with collector current and temperature?

MPSA92_D74Z shows h_FE = 40 at I_C = 10 mA and 25°C, dropping to ~25 at I_C = 30 mA; at –40°C it decreases by ~15%, while at 125°C it increases by ~20% relative to room temperature-data confirmed in the "DC Current Gain vs Collector Current" plot on page 4 of the datasheet.

Can MPSA92_D74Z replace MPSA42 in high-voltage applications?

No-MPSA42 is an NPN transistor with V_CEO = 300 V but opposite polarity and different gain/saturation characteristics. MPSA92_D74Z is strictly a PNP device; substituting it for MPSA42 would invert logic and require complete circuit redesign including bias network reversal.

What is the maximum safe operating voltage for MPSA92_D74Z in common-emitter configuration?

In common-emitter configuration, MPSA92_D74Z must not exceed V_CEO = 300 V between collector and emitter with base open. For reliable long-term operation, design margin recommends limiting V_CE to ≤ 240 V under worst-case transient conditions per Fairchild's application guidance.

MPSA92_D74Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

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):: 250nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 25 @ 30mA, 10V

Power - Max:: 625 mW

Frequency - Transition:: 50MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

MPSA92_D74Z FAQ

1.How can I place an order for MPSA92_D74Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPSA92_D74Z 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 MPSA92_D74Z reliable?

The price and inventory of MPSA92_D74Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSA92_D74Z is usually 5 days.

3.What payment methods are accepted for MPSA92_D74Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSA92_D74Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPSA92_D74Z?

MPSA92_D74Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPSA92_D74Z 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 MPSA92_D74Z?

For technical support, including MPSA92_D74Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSA92_D74Z requirements.

6.How does Aetrix verify that MPSA92_D74Z is sourced from the original manufacturer or authorized distributors?

All MPSA92_D74Z 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 MPSA92_D74Z meets industry standards.

7.What is the process for return or replacement of MPSA92_D74Z?

All MPSA92_D74Z units undergo pre-shipment inspection (PSI). If there is an issue with MPSA92_D74Z, 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 MPSA92_D74Z part is unused and in its original packaging.

Return procedure for MPSA92_D74Z:

1.Submit a request within 90 days.

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

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