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onsemi BD236STU
- Part No.:
- BD236STU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
BD236STU.pdf
- Description:
- TRANS PNP 60V 2A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,617
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Product details
Overview
BD236STU from Fairchild Semiconductor is a PNP epitaxial silicon transistor in TO-126 package, rated for -60 V collector-base voltage, -60 V collector-emitter sustaining voltage, and 25 W collector dissipation at TC=25°C. It delivers DC current gain (hFE) ≥40 at IC = -150 mA and supports medium-power linear regulation and switching in industrial power supplies and motor control circuits.
For engineers reviewing the BD236STU datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, TO-126 thermal performance, -60 V VCEO(sus), -2 A continuous collector current capability, and complementary pairing with BD235 for push-pull output stages.
Technical Context
The BD236STU operates as a medium-power PNP bipolar junction transistor optimized for linear amplification and hard-switching applications. Its design emphasizes robust safe operating area (SOA) up to 25 W at 25°C case temperature, with derating to zero at 150°C junction temperature.
It features a fixed three-terminal configuration (Emitter–Collector–Base) with verified VBE(on) = -1.3 V at IC = -1 A and VCE(sat) = -0.6 V under IC = -1 A / IB = -0.1 A conditions, enabling predictable biasing and low-saturation-loss operation in discrete driver stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | -60 V - Maximum reverse voltage the collector-base junction withstands without breakdown; defines high-side PNP blocking capability. |
| VCEO(sus) | -60 V - Sustaining voltage under open-base condition at IC = -100 mA; critical for switch-mode snubber and protection circuit design. |
| IC (DC) | -2 A - Continuous collector current rating; sets maximum steady-state load drive capacity in linear regulators or relay drivers. |
| PC (TC=25°C) | 25 W - Maximum power dissipation at case temperature 25°C; determines heatsink sizing requirement for thermal management. |
| hFE | ≥40 @ IC = -150 mA - Minimum DC current gain ensures reliable base drive efficiency in Class-A amplifiers and emitter-follower buffers. |
| fT | 3 MHz - Current gain bandwidth product; limits usable frequency range in audio preamplifier or low-speed switching applications. |
| VCE(sat) | -0.6 V @ IC = -1 A, IB = -0.1 A - Low saturation voltage minimizes conduction loss in saturated-switch configurations like lamp dimmers. |
Pinout & Package
BD236STU is housed in a TO-126 plastic package with integral metal tab for heatsinking. The case is electrically connected to the collector terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP device | Connected to higher potential rail; carries full load current in common-emitter switch configuration. |
| 2 (Collector) | Current sink terminal, tied to case | Electrically bonded to metal tab; must be isolated from chassis unless designed as heatsink ground reference. |
| 3 (Base) | Control input for minority-carrier injection | Receives negative base current to turn on; requires series resistor to limit IB and ensure hFE-driven saturation. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary pairing | Explicitly designed as PNP complement to BD235 (NPN), enabling matched push-pull output stages with symmetrical gain and SOA. |
| High VCEO(sus) | -60 V sustaining voltage allows direct use in 48 V DC bus switching without external clamping in industrial controls. |
| TO-126 thermal interface | Metal tab enables direct mounting to heatsinks; 25 W dissipation rating supports >1.5 A continuous current with ≤10°C/W heatsink. |
| Low VCE(sat) | -0.6 V saturation voltage reduces power loss by >30% versus legacy PNP transistors (e.g., BD139) at 1 A load. |
Applications
| Industrial Power Supply Regulation | DC Motor Direction Control |
|---|---|
Use Scenario: Linear pass transistor in adjustable 0–30 V, 1.5 A bench power supply. IC Role / Device Role / Timing Role: PNP pass element configured in emitter-follower topology to regulate output voltage via feedback-controlled base bias. Use Value: High hFE (≥40) and low VCE(sat) (-0.6 V) minimize dropout voltage and thermal stress during constant-current limiting. |
Use Scenario: H-bridge upper-leg switch for bidirectional 24 V brushed DC motor (≤1.2 A). IC Role / Device Role / Timing Role: High-side PNP switch driven by NPN level shifter; complements BD235 in diagonal pair. Use Value: Matched VCEO(sus) (-60 V) and SOA with BD235 enable balanced voltage sharing and thermal tracking in bridge arms. |
| Relay Driver Stage | Audio Output Buffer |
Use Scenario: Driving 12 V/400 mW electromagnetic relay coil requiring 33 mA hold current. IC Role / Device Role / Timing Role: Saturated PNP switch sinking coil current to ground when base is pulled low. Use Value: -2 A IC rating provides 60× safety margin; -0.6 V VCE(sat) ensures <20 mW coil-side loss during activation. |
Use Scenario: Emitter-follower output stage in 5 W class-AB audio amplifier feeding 8 Ω speaker. IC Role / Device Role / Timing Role: PNP output device delivering negative half-cycle current; paired with NPN BD235 for full-wave drive. Use Value: fT = 3 MHz supports flat response to 20 kHz; TO-126 package enables direct heatsink attachment for sustained 2 W dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BD236G | Same electrical specs and TO-126 package; RoHS-compliant lead finish (Pb-free plating), no halogen content. | Required for EU/China export compliance; identical thermal and switching behavior in all legacy designs. | Select BD236G when environmental compliance (RoHS/REACH) is mandatory; BD236STU remains valid for non-regulated markets. |
| MJD2955T4G | Higher VCEO = -70 V, lower hFE min = 20, TO-220 package with isolated tab; PC = 40 W at TC=25°C. | Better suited for higher-voltage 60 V bus systems; requires different mechanical mounting and PCB footprint. | Choose MJD2955T4G only if VCEO > -60 V or PC > 25 W is required; not a drop-in replacement due to TO-220 footprint and tab isolation. |
Compared with BD236STU, BD236G offers identical performance with updated environmental compliance, while MJD2955T4G trades pin compatibility for higher voltage and power ratings-requiring layout revision but enabling extended bus voltage operation.
Availability
BD236STU is available at Aetrix Electronics and suitable for industrial power supply regulation, DC motor direction control, relay driver stages, and audio output buffering requiring stable component supply and long-term BOM continuity.
Supply support for BD236STU 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 was a U.S.-based designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy products remain widely deployed in industrial and automotive systems.
The BD236STU belongs to Fairchild's BD23x PNP transistor family, engineered specifically for medium-power linear regulation and complementary switching in cost-sensitive industrial equipment where thermal reliability and parameter consistency are essential.
FAQ
What is the maximum continuous collector current rating for BD236STU?
The BD236STU has a maximum continuous collector current (IC) rating of -2 A at TC = 25°C. This rating assumes proper heatsinking and derates linearly with increasing case temperature, reaching zero at 150°C. In practice, sustained operation above -1.2 A requires a heatsink with ≤10°C/W thermal resistance to maintain safe junction temperature.
Is BD236STU pin-compatible with BD234STU or BD238STU?
Yes, BD236STU shares identical TO-126 package dimensions, pinout (Emitter–Collector–Base), and terminal assignments with BD234STU and BD238STU. However, their voltage ratings differ: BD234STU is rated for -45 V VCEO(sus), BD236STU for -60 V, and BD238STU for -80 V. Swapping requires verification of voltage margin in the target circuit.
Does BD236STU have a built-in base-emitter resistor?
No, BD236STU is a standard three-lead PNP bipolar transistor without any integrated base-emitter resistors. External base biasing components-including current-limiting resistors and optional pull-down resistors-must be provided per application requirements. This distinguishes it from digital transistors (e.g., EMH series) that integrate on-chip resistors.
What is the safe operating area (SOA) limitation for BD236STU in pulse operation?
The BD236STU supports pulsed collector current up to -6 A (ICP) under conditions of PW = 300 µs and duty cycle = 1.5%. Its SOA curve confirms stable operation up to 100 V × 1 A (100 W) for 10 µs pulses, but continuous operation beyond 25 W requires active thermal management. Pulse handling must respect both voltage and current boundaries simultaneously.
Can BD236STU replace BD235 in a push-pull amplifier stage?
No-BD236STU is a PNP transistor and BD235 is an NPN transistor; they serve complementary roles. BD236STU is explicitly designed as the PNP counterpart to BD235 (NPN) for push-pull output stages. Substituting BD236STU for BD235 would invert polarity and prevent proper circuit function. Always use BD236STU with BD235, not instead of it.
BD236STU 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):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 600mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 25 @ 1A, 2V
- Power - Max:
- 25 W
- Frequency - Transition:
- 3MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
BD236STU FAQ
1.How can I place an order for BD236STU through Aetrix?
Please submit a Request for Quotation (RFQ) for BD236STU 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 BD236STU reliable?
The price and inventory of BD236STU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD236STU is usually 5 days.
3.What payment methods are accepted for BD236STU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD236STU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD236STU?
BD236STU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD236STU 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 BD236STU?
For technical support, including BD236STU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD236STU requirements.
6.How does Aetrix verify that BD236STU is sourced from the original manufacturer or authorized distributors?
All BD236STU 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 BD236STU meets industry standards.
7.What is the process for return or replacement of BD236STU?
All BD236STU units undergo pre-shipment inspection (PSI). If there is an issue with BD236STU, 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 BD236STU part is unused and in its original packaging.
Return procedure for BD236STU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BD236STU Tags
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