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Diodes Incorporated BCX55TA
- Part No.:
- BCX55TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX55TA.pdf
- Description:
- TRANS NPN 60V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,329
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Product details
Overview
BCX55TA from Diodes Incorporated is an NPN medium-power transistor in SOT89 package, rated for 60V VCEO, 1A continuous collector current, and <500mV VCE(sat) at 0.5A. It features epitaxial planar die construction, low thermal resistance (RθJL = 13°C/W), and is qualified for automotive-grade applications with AEC-Q101 capability. It is used in AF driver stages and medium-power switching circuits.
For engineers reviewing the BCX55TA datasheet, BCX55TA pinout, BCX55TA application, or BCX55TA equivalent, key selection criteria include its 60V breakdown rating, 1A DC current handling, SOT89 thermal performance, complementary PNP pairing (BCX52), and RoHS/Green compliance for industrial and automotive designs.
Technical Context
This NPN bipolar junction transistor operates in linear amplification and saturated switching modes, with hFE ranging from 25 to 250 across 5mA–500mA IC. Its fT of 150MHz supports audio-frequency and low-speed digital switching applications.
The device uses a thermally optimized SOT89 package with exposed collector pad, enabling RθJC = 39°C/W and RθJL = 13°C/W under standard mounting-critical for sustained 1A operation without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage before avalanche breakdown in common-emitter configuration. |
| IC (continuous) | 1 A - Sustained collector current capability with proper PCB copper area (≥15 mm² 1oz Cu) and ambient ≤25°C. |
| VCE(sat) | <0.5 V @ IC = 500 mA, IB = 50 mA - Low conduction loss enables efficient medium-power switching with minimal heat generation. |
| hFE | 25–250 - Current gain range supporting both high-gain biasing (e.g., sensor interface) and robust switching drive (e.g., relay control). |
| fT | 150 MHz - Sufficient bandwidth for audio amplification, PWM motor control feedback paths, and low-speed digital signal buffering. |
| RθJL | 13 °C/W - Junction-to-lead thermal resistance confirms direct heat transfer path via exposed collector pad to PCB copper. |
Pinout & Package
Package: SOT89 - Surface-mount plastic package with exposed collector tab for enhanced thermal dissipation; 3-pin configuration with standardized footprint per Diodes' outline drawing (Doc DS35369 Rev. 12-2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | E | Current sink node; connects to ground or low-side load return path; requires low-impedance trace for stable biasing. |
| Pin 2 (Base) | B | Control input; driven by microcontroller GPIO or op-amp output; 100 mA max continuous base current limits driver strength requirements. |
| Pin 3 (Collector) | C | High-current output node; electrically and thermally connected to exposed metal tab; must be soldered to ≥15 mm² 1oz Cu for full 1A rating. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive temperature range (−55°C to +150°C) and reliability stress testing-enables use in engine control modules and body electronics. |
| Green / Halogen-free | Meets <900 ppm Br, <900 ppm Cl, <1000 ppm Sb-complies with global environmental regulations including RoHS 3 and automotive ELV directives. |
| Low VCE(sat) | <500 mV at 0.5A ensures <250 mW conduction loss, reducing thermal load in space-constrained power stages. |
| Complementary PNP pair | BCX52TA shares identical SOT89 package and matching specs (60V, 1A), enabling balanced push-pull amplifier and H-bridge driver designs. |
| ESD robustness | HBM 4000 V and CDM 1000 V ratings reduce susceptibility to assembly-line and field ESD events without external protection. |
Applications
| Audio Frequency Driver | DC Motor Control Stage |
|---|---|
|
Use Scenario: Driving 8Ω speaker loads in portable audio amplifiers with single-supply rail. IC Role / Device Role / Timing Role: NPN switch/amplifier operating in Class AB mode, delivering up to 500mA peak current with low distortion. Use Value: VCE(sat) <500mV minimizes voltage drop and heat rise, preserving battery life and enabling compact heatsinkless design. |
Use Scenario: Controlling 12V brushed DC motors in automotive seat adjusters and HVAC actuators. IC Role / Device Role / Timing Role: High-side or low-side switch in PWM-driven H-bridge half-bridge stage, handling 1A continuous stall current. Use Value: 60V VCEO accommodates 12V system transients (e.g., load dump), while RθJL = 13°C/W sustains duty-cycle operation without derating. |
| Power Supply Pass Transistor | Industrial Sensor Interface Amplifier |
|
Use Scenario: Linear regulator pass element in 5V/1A adjustable LDOs for FPGA core supplies. IC Role / Device Role / Timing Role: Series pass transistor regulating output voltage via base bias control from error amplifier. Use Value: hFE ≥25 at 1A ensures stable closed-loop regulation with minimal base drive current (<40mA), easing op-amp selection. |
Use Scenario: Amplifying low-level signals from RTD or strain gauge bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Discrete NPN configured as emitter-follower buffer or common-emitter gain stage with precision biasing. Use Value: Tight hFE spread (25–250) and low VBE(on) (≤1.0V) enable accurate DC-coupled gain setting and low-offset signal conditioning. |
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 |
|---|---|---|---|
| ZTX653 | Higher VCEO (100V), lower hFE (min 20), same SOT89 package and 1A rating. | Better suited for 24V industrial systems with higher transient margins; less ideal for low-base-drive audio stages. | Select when system transients exceed 60V but base drive current budget is tight. |
| BCP55 | Same VCEO (60V), identical hFE range, but TO-92 package (higher RθJA = 200°C/W vs. SOT89's 125°C/W). | Limited to <300mA continuous in still air; unsuitable for 1A sustained loads without heatsinking. | Choose only for prototyping or low-power legacy replacements where SMT is not required. |
Compared with ZTX653 and BCP55, BCX55TA delivers optimal balance of 60V ruggedness, 1A thermal capability in SOT89, and AEC-Q101 qualification-making it preferred for production automotive and industrial power stages where board space and reliability are critical.
Availability
BCX55TA is available at Aetrix Electronics and suitable for audio frequency drivers, DC motor control stages, linear regulator pass elements, and industrial sensor interface amplifiers requiring stable component supply across automotive, industrial, and consumer electronics programs.
Supply support for BCX55TA 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets since 1959.
BCX55TA belongs to Diodes' BCX5x series of medium-power bipolar transistors designed specifically for robust, thermally efficient switching and amplification in space-constrained automotive and industrial control systems.
FAQ
Is BCX55TA pin-compatible with BCX54TA and BCX56TA?
Yes-BCX54TA, BCX55TA, and BCX56TA share identical SOT89 pinout (E-B-C), marking layout, and mechanical dimensions. Only electrical ratings differ: VCEO is 45V, 60V, and 80V respectively. Substitution requires verification of voltage margin in the target circuit.
What is the maximum allowable PCB copper area for BCX55TA to achieve 1.5W power dissipation?
Per DS35369 Note 7, 1.5W power dissipation requires mounting on 25mm × 25mm (625 mm²) of 1oz copper on FR4. This reduces RθJA from 225°C/W to 83°C/W, enabling 1.5W at TA = 25°C with ΔTJ-A = 125°C.
Does BCX55TA support pulsed operation beyond 1A?
Yes-its ICM is rated at 2A for peak pulse current (tp ≤ 100µs, duty cycle ≤ 2%). This supports short-duration surge loads such as solenoid actuation or inrush limiting, provided average power remains within thermal limits.
Can BCX55TA replace BCX52TA in a complementary pair design?
No-BCX52TA is the complementary PNP counterpart (60V, 1A), not a substitute. BCX55TA is NPN; using two NPN devices would break push-pull symmetry. Always pair BCX55TA with BCX52TA for matched gain, voltage, and thermal behavior in dual-transistor topologies.
BCX55TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 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 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
BCX55TA FAQ
1.How can I place an order for BCX55TA through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX55TA 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 BCX55TA reliable?
The price and inventory of BCX55TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX55TA is usually 5 days.
3.What payment methods are accepted for BCX55TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX55TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX55TA?
BCX55TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX55TA 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 BCX55TA?
For technical support, including BCX55TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX55TA requirements.
6.How does Aetrix verify that BCX55TA is sourced from the original manufacturer or authorized distributors?
All BCX55TA 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 BCX55TA meets industry standards.
7.What is the process for return or replacement of BCX55TA?
All BCX55TA units undergo pre-shipment inspection (PSI). If there is an issue with BCX55TA, 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 BCX55TA part is unused and in its original packaging.
Return procedure for BCX55TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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