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onsemi BD442STU-ON
- Part No.:
- BD442STU-ON
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
BD442STU-ON.pdf
- Description:
- TRANS PNP 80V 4A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,920
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Product details
Overview
BD442STU-ON from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon power transistor in TO-126 package, rated for -80 V VCEO, -4 A continuous collector current, 36 W power dissipation at TC=25°C, and 3 MHz transition frequency - used in medium-power linear regulation and switching circuits such as DC motor drivers and relay drivers.
For engineers reviewing the BD442STU-ON datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, TO-126 mechanical compatibility, guaranteed -80 V breakdown rating, hFE range of 15–140 at IC = -2 A, and VCE(sat) ≤ -0.8 V at IC = -2 A / IB = -0.2 A.
Technical Context
This device operates as a medium-power PNP bipolar junction transistor with fixed emitter-base-collector terminal assignment and no integrated protection circuitry. Its safe operating area (SOA) is defined up to 10 ms pulse width, and thermal derating begins at TC > 25°C per the published power derating curve.
It features a DC current gain (hFE) that varies from 15 (min) at IC = -2 A to 140 (max) at IC = -10 mA, and exhibits VBE(on) of -0.58 V (typ) at IC = -10 mA and -1.5 V (typ) at IC = -2 A - confirming strong base drive requirements at high current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -80 V - maximum allowable collector-emitter voltage before avalanche breakdown under open-base conditions |
| IC (DC) | -4 A - continuous collector current rating defining steady-state conduction capability |
| PC | 36 W - maximum power dissipation at case temperature of 25°C, requiring heatsinking above ~50°C |
| hFE | 15–140 - DC current gain range across operating currents, critical for base drive sizing |
| VCE(sat) | ≤ -0.8 V @ IC = -2 A, IB = -0.2 A - saturation voltage determining on-state power loss in switching use |
| fT | 3 MHz - current gain bandwidth product limiting usable frequency in amplifier configurations |
Pinout & Package
BD442STU-ON is housed in a TO-126 plastic package with three leads: Emitter (Lead 1), Collector (Lead 2), Base (Lead 3). The collector tab is electrically connected to lead 2 and serves as the primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit node for PNP operation | Connected to most positive rail in typical common-emitter switch configuration |
| 2 (Collector) | Current entry node; thermally tied to case | Mounted to heatsink; requires isolation if heatsink is grounded |
| 3 (Base) | Control input for minority-carrier injection | Requires negative current relative to emitter to turn on; resistor-limited drive typical |
Key Features
| Feature | Design Value |
|---|---|
| Complementary pair to BD441 | Enables push-pull output stages when paired with NPN BD441 in linear amplifiers or H-bridge drivers |
| VCBO = -80 V | Supports higher-voltage DC bus designs than BD440 (-60 V), reducing need for voltage clamping |
| TO-126 package | Provides standardized mechanical footprint and thermal interface compatible with legacy board layouts |
| hFE ≥ 15 @ IC = -2 A | Ensures sufficient current gain for direct TTL/CMOS-compatible base drive without Darlington staging |
Applications
| DC Motor Control | Relay Driving |
|---|---|
Use Scenario: Bidirectional 24 V DC brushed motor control using complementary PNP/NPN pairs in half-bridge topology. IC Role / Device Role / Timing Role: BD442STU-ON acts as high-side PNP switch, sinking current from motor to ground during active low-side conduction. Use Value: -80 V VCEO margin accommodates 24 V supply plus inductive flyback spikes without clamping diodes. | Use Scenario: Driving 12 V/500 mA electromagnetic relays from microcontroller GPIO pins via base-resistor interface. IC Role / Device Role / Timing Role: BD442STU-ON functions as saturated PNP switch, turning relay coil on/off with minimal VCE(sat) loss. Use Value: -0.8 V VCE(sat) at -2 A ensures <1.6 W dissipation in relay coil path, enabling compact PCB layout. |
| Linear Voltage Regulation | Power Supply Foldback Protection |
Use Scenario: Pass transistor in adjustable 5–15 V linear regulator delivering up to 3 A load current. IC Role / Device Role / Timing Role: BD442STU-ON serves as series pass element, dissipating excess input-output differential voltage. Use Value: 36 W PC rating allows stable operation at 12 V dropout × 2.5 A = 30 W, within SOA limits. | Use Scenario: Current-limiting element in foldback protection circuit that reduces output current during short-circuit events. IC Role / Device Role / Timing Role: BD442STU-ON operates in active region, modulating collector current based on sensed output voltage deviation. Use Value: hFE stability over IC range enables predictable foldback threshold calibration without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD44H11T4G | Higher VCEO (-100 V), TO-220 package, 8 A IC, 50 W PC | Requires PCB layout change; better suited for 48 V systems or higher-current loads | Select when higher voltage headroom or thermal capacity is required; not drop-in compatible |
| BD442 | Same die, TO-126 package, bulk packaging (vs. rail for BD442STU-ON) | No functional difference; identical electrical specs and pinout | Choose BD442 for cost-sensitive manual assembly; BD442STU-ON preferred for automated pick-and-place |
Compared with MJD44H11T4G and BD442, BD442STU-ON offers optimized logistics for SMT placement while maintaining identical performance to BD442 - making it ideal for volume production where tape-and-reel feeding and thermal reliability at 24–48 V are priorities.
Availability
BD442STU-ON is available at Aetrix Electronics and suitable for DC motor control, relay driving, linear voltage regulation, and power supply foldback protection requiring stable component supply and TO-126 mechanical compatibility.
Supply support for BD442STU-ON 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.
BD442STU-ON belongs to ON Semiconductor's legacy discrete power transistor portfolio, designed specifically for medium-power linear and switching applications where robust PNP performance, proven reliability, and TO-126 manufacturability are essential.
FAQ
What is the maximum collector-emitter voltage rating for BD442STU-ON?
The BD442STU-ON has a maximum collector-emitter voltage (VCEO) rating of -80 V at TC = 25°C. This rating applies under open-base conditions and defines the upper limit for safe DC or pulsed operation without avalanche breakdown. Derating is required above 25°C case temperature per the published power derating curve.
Is BD442STU-ON pin-compatible with BD442?
Yes, BD442STU-ON is fully pin-compatible with BD442 - both use the TO-126 package with identical lead assignment (1: Emitter, 2: Collector, 3: Base) and share identical electrical specifications. The only distinction is packaging: BD442STU-ON is supplied in tape-and-reel (RAIL), while BD442 is offered in bulk.
What is the typical VCE(sat) of BD442STU-ON at full load?
The BD442STU-ON exhibits a typical collector-emitter saturation voltage (VCE(sat)) of -0.8 V when operated at IC = -2 A and IB = -0.2 A. This value is confirmed in the datasheet's "Electrical Characteristics" table and directly impacts conduction losses in switching applications.
Does BD442STU-ON require a heatsink in continuous 3 A operation?
Yes, BD442STU-ON requires a heatsink for continuous 3 A operation. At IC = -3 A and VCE(sat) ≈ -0.85 V, power dissipation exceeds 2.5 W - well above the 36 W rating only achievable at TC = 25°C. Without thermal management, junction temperature will exceed 150°C rapidly.
What is the DC current gain (hFE) range of BD442STU-ON across its operating current?
The BD442STU-ON has a DC current gain (hFE) ranging from 15 (minimum) at IC = -2 A to 140 (maximum) at IC = -10 mA. This wide variation must be accounted for in base drive design - especially in linear applications where gain stability affects regulation accuracy.
BD442STU-ON Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 800mV @ 200mA, 2A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 500mA, 1V
- Power - Max:
- 36 W
- Frequency - Transition:
- 3MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
BD442STU-ON FAQ
1.How can I place an order for BD442STU-ON through Aetrix?
Please submit a Request for Quotation (RFQ) for BD442STU-ON 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 BD442STU-ON reliable?
The price and inventory of BD442STU-ON are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD442STU-ON is usually 5 days.
3.What payment methods are accepted for BD442STU-ON?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD442STU-ON transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD442STU-ON?
BD442STU-ON orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD442STU-ON 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 BD442STU-ON?
For technical support, including BD442STU-ON datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD442STU-ON requirements.
6.How does Aetrix verify that BD442STU-ON is sourced from the original manufacturer or authorized distributors?
All BD442STU-ON 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 BD442STU-ON meets industry standards.
7.What is the process for return or replacement of BD442STU-ON?
All BD442STU-ON units undergo pre-shipment inspection (PSI). If there is an issue with BD442STU-ON, 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 BD442STU-ON part is unused and in its original packaging.
Return procedure for BD442STU-ON:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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