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onsemi BD1356STU
- Part No.:
- BD1356STU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
BD1356STU.pdf
- Description:
- TRANS NPN 45V 1.5A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,267
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Product details
Overview
BD1356STU from Fairchild Semiconductor is an NPN epitaxial silicon transistor in TO-126 package, rated for 45 V VCEO, 1.5 A continuous collector current, and 12.5 W case power dissipation at 25°C - used in medium-power linear amplification and switching circuits such as audio output stages and relay drivers.
For engineers reviewing the BD1356STU datasheet, pinout, applications, or equivalent options, key selection criteria include VCEO/VCBO rating, hFE classification (40–100), VCE(sat) @ 500 mA/50 mA, thermal derating behavior, and complementary pairing with BD136.
Technical Context
This device operates as a medium-power bipolar junction transistor with fixed emitter-base-collector terminal assignment (Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base). Its DC current gain is specified across three test conditions: hFE1 (IC = 5 mA), hFE2 (IC = 0.5 A), and hFE3 (IC = 150 mA), enabling stable biasing in both small-signal and power-switching configurations.
The BD1356STU exhibits VCE(sat) ≤ 0.5 V at IC = 500 mA and IB = 50 mA, and VBE(on) ≈ 1.0 V under same conditions - supporting predictable base drive requirements and low conduction loss in saturated switch operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (DC) | 1.5 A - continuous collector current limit defining usable linear/saturation range |
| PC (TC=25°C) | 12.5 W - thermal power handling capability with heatsink at case temperature 25°C |
| hFE (IC=150 mA) | 40–100 - DC current gain range determining base drive sensitivity and stability margin |
| VCE(sat) | ≤0.5 V @ IC=500 mA, IB=50 mA - low saturation voltage enabling efficient switching with minimal power loss |
| TJ | 150°C - maximum junction temperature defining thermal safety boundary for reliability |
Pinout & Package
BD1356STU uses the TO-126 package: molded plastic case with metal tab (collector-connected), 3-pin through-hole configuration, 16.10 mm × 13.06 mm footprint, and 14.20 mm max height. Pin 1 = Emitter, Pin 2 = Collector (tab), Pin 3 = Base.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit path for majority carriers | Connected to ground or low-side reference; defines emitter-follower or common-emitter topology |
| 2 (Collector) | Current entry path; electrically tied to metal tab | Requires heatsinking via tab; must be isolated from PCB ground unless circuit design permits |
| 3 (Base) | Control terminal for minority carrier injection | Driven by resistor-limited current source; sensitive to ESD and overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Complementary pairing | Designed as NPN counterpart to BD136 PNP - enables push-pull amplifier and H-bridge driver implementation |
| Medium-power SOA | Safe Operating Area supports pulsed IC up to 3.0 A and DC operation up to 1.5 A with proper thermal management |
| Low VCE(sat) | Ensures <1.5 W conduction loss at 500 mA, reducing heat generation in switching applications |
| hFE classification | Guaranteed 40–100 gain band allows predictable bias network design without trimming |
Applications
| Audio Power Amplifier Output Stage | DC Motor Driver (Small Brushed) |
|---|---|
Use Scenario: Final output stage in Class-B or AB audio amplifiers delivering up to 10 W into 8 Ω loads. IC Role / Device Role / Timing Role: NPN power switch amplifying line-level input to drive loudspeaker impedance. Use Value: Low VCE(sat) minimizes crossover distortion and thermal stress during high-current peaks. | Use Scenario: Unidirectional drive for 6–24 V brushed DC motors in industrial actuators and lab equipment. IC Role / Device Role / Timing Role: Single-ended switch controlling motor current flow from supply rail to ground. Use Value: 1.5 A DC rating and 12.5 W dissipation support sustained 500–800 mA motor loads with passive heatsinking. |
| Relay Driver Circuit | Linear Voltage Regulator Pass Element |
Use Scenario: Driving 12 V/500 mA electromagnetic relays in PLC I/O modules and control panels. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to relay coil. Use Value: Guaranteed hFE ≥ 40 ensures reliable turn-on with ≤5 mA base drive, simplifying logic-level interface. | Use Scenario: Series pass transistor in adjustable linear regulators supplying 1–3 A at 5–12 V. IC Role / Device Role / Timing Role: Current-controlled variable resistor dissipating excess input-output differential voltage. Use Value: 150°C TJ rating and defined thermal resistance allow stable operation under 5 W typical dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BD135G | Same electrical specs and TO-126 package; RoHS-compliant variant with green molding compound | No functional difference; identical pinout and thermal profile | Select BD135G when lead-free compliance and halogen-free packaging are required |
| MJD13005 | Higher VCEO (60 V), higher IC (2.0 A), but hFE min = 20 (vs. 40 for BD1356STU) and different pinout (E-C-B vs. E-C-B) | Not drop-in; requires PCB layout revision and base resistor recalculation due to lower gain | Choose MJD13005 only when higher voltage headroom and current capacity outweigh gain consistency needs |
Compared with BD1356STU, BD135G offers identical performance with environmental compliance, while MJD13005 trades guaranteed gain stability for extended voltage/current margins - making BD1356STU preferable where predictable hFE and legacy compatibility are critical.
Availability
BD1356STU is available at Aetrix Electronics and suitable for audio amplifiers, relay drivers, DC motor controls, and linear regulator designs requiring stable component supply and long-term industrial availability.
Supply support for BD1356STU 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 semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016.
The BD1356STU belongs to Fairchild's legacy medium-power bipolar transistor family, designed for cost-sensitive industrial and consumer linear/switching applications where robustness, thermal stability, and complementary pairing matter.
FAQ
What is the pin configuration of BD1356STU?
The BD1356STU uses a fixed TO-126 pinout: Pin 1 is Emitter, Pin 2 is Collector (internally connected to the metal tab), and Pin 3 is Base. This arrangement is standardized across the BD135/137/139 series and must be observed to avoid reverse-bias damage or incorrect circuit operation. Always verify orientation using the tab and notch marking on the package body before soldering BD1356STU.
Is BD1356STU RoHS compliant?
BD1356STU is not RoHS compliant as supplied - it predates RoHS Directive 2002/95/EC and contains lead in solder and die attach materials. For RoHS-compliant alternatives, consider BD135G (same specs, green compound) or ON Semiconductor's NSS12201LT1G (SOT-223, lower power). BD1356STU remains viable for non-RoHS industrial applications where legacy qualification and thermal performance are prioritized over compliance.
What is the maximum safe operating temperature for BD1356STU?
The BD1356STU has a maximum junction temperature (TJ) of 150°C and storage temperature range of –55°C to +150°C. Safe continuous operation requires maintaining TJ ≤ 150°C via appropriate heatsinking - derating linearly to zero power at 150°C case temperature per the published power derating curve. Exceeding this limit risks parametric shift or catastrophic failure of BD1356STU.
Can BD1356STU replace BD135 in existing designs?
Yes - BD1356STU is functionally and physically identical to BD135, sharing the same TO-126 package, pinout, absolute maximum ratings, and electrical characteristics including VCEO = 45 V, IC = 1.5 A, and hFE = 40–100. No layout or schematic changes are needed when substituting BD1356STU for BD135; it is a direct replacement preserving all thermal, switching, and linear performance in BD1356STU-based systems.
What complementary PNP transistor pairs with BD1356STU?
BD1356STU is explicitly designed to complement BD136 - a PNP transistor with matching voltage ratings (VCEO = 45 V), current capability (IC = 1.5 A), and TO-126 package. This pairing enables symmetrical push-pull output stages, H-bridge half-bridges, and complementary feedback networks. BD136 shares identical pinout (E-C-B), ensuring mechanical and electrical compatibility with BD1356STU in dual-transistor layouts.
BD1356STU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 150mA, 2V
- Power - Max:
- 1.25 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
BD1356STU FAQ
1.How can I place an order for BD1356STU through Aetrix?
Please submit a Request for Quotation (RFQ) for BD1356STU 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 BD1356STU reliable?
The price and inventory of BD1356STU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD1356STU is usually 5 days.
3.What payment methods are accepted for BD1356STU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD1356STU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD1356STU?
BD1356STU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD1356STU 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 BD1356STU?
For technical support, including BD1356STU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD1356STU requirements.
6.How does Aetrix verify that BD1356STU is sourced from the original manufacturer or authorized distributors?
All BD1356STU 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 BD1356STU meets industry standards.
7.What is the process for return or replacement of BD1356STU?
All BD1356STU units undergo pre-shipment inspection (PSI). If there is an issue with BD1356STU, 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 BD1356STU part is unused and in its original packaging.
Return procedure for BD1356STU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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