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Diodes Incorporated BCX53TA
- Part No.:
- BCX53TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX53TA.pdf
- Description:
- TRANS PNP 80V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:751
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Product details
Overview
BCX53TA from Diodes Incorporated is a PNP medium-power bipolar junction transistor in SOT89 package, rated for -80V VCEO, -1A continuous collector current, and < -500mV VCE(sat) at -500mA/-50mA drive-used in AF output stages and medium-power switching circuits requiring robust thermal performance on PCB copper areas ≥50 mm².
For engineers reviewing the BCX53TA datasheet, BCX53TA pinout, BCX53TA application, or BCX53TA equivalent, key selection criteria include verified VCEO = -80V, RθJC = 27°C/W, hFE ≥ 100 @ -150mA, fT = 150MHz, and SOT89 thermal derating behavior across -55°C to +150°C operating range.
Technical Context
The BCX53TA operates as a single PNP BJT with fixed emitter-base and collector-base junctions, supporting linear amplification and saturated switching modes. Its DC current gain (hFE) ranges from 25 to 250 depending on IC and VCE, with guaranteed minimum hFE = 100 at IC = -150mA and VCE = -2V.
Thermal design relies on direct heat conduction from the exposed collector pad to PCB copper; RθJL = 13°C/W and RθJC = 27°C/W enable 2.0W power dissipation when mounted on 50mm × 50mm 1oz copper, while ESD ratings meet HBM 4kV and CDM 1kV per JEDEC JS-001/JS-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -80 V - Maximum allowable collector-emitter voltage before breakdown under open-base conditions; defines safe operating voltage ceiling in switching applications. |
| IC (cont.) | -1 A - Continuous DC collector current rating; sets maximum steady-state load current capability without thermal runaway on adequate copper area. |
| VCE(sat) | < -500 mV @ -500mA/-50mA - Low saturation voltage ensures minimal conduction loss and heat generation in switch-mode operation. |
| hFE | 100–250 @ IC = -150mA - Confirmed DC current gain range enables predictable base drive sizing for amplifier or switch bias networks. |
| fT | 150 MHz - Transition frequency supports audio-frequency amplification and moderate-speed switching up to ~10–20 MHz with gain margin. |
| RθJC | 27 °C/W - Junction-to-case thermal resistance measured to top of case; critical for heatsink interface design in high-power analog stages. |
| TJ Range | -55°C to +150°C - Full industrial temperature range validated; enables use in automotive under-hood and industrial motor control environments. |
Pinout & Package
Package: SOT89 - Surface-mount plastic package with exposed collector pad for thermal conduction; 3-terminal configuration; 0.052g mass; UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current sink terminal, electrically connected to exposed metal pad | Primary thermal path to PCB; must be soldered to ≥50 mm² copper for full 2.0W rating; carries full load current in switching mode. |
| Emitter (E) | Current source terminal, common reference for base drive | Connected to system ground or negative rail in high-side switch configurations; establishes VEB bias for turn-on control. |
| Base (B) | Control input terminal for minority-carrier injection | Receives current-limited drive (max -100mA continuous); requires series resistor to limit IB and ensure hFE-based saturation. |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | -80 V enables use in 48V industrial bus switching and automotive 24V systems with voltage transients. |
| Low VCE(sat) | < -500 mV at -500mA reduces power loss to ≤250 mW in saturated switching, minimizing thermal stress. |
| Exposed collector pad | Enables direct thermal coupling to PCB; achieves RθJA = 60°C/W on 50mm × 50mm 1oz copper for stable high-current operation. |
| AEC-Q101 readiness | Manufactured in IATF 16949 certified facilities; supports PPAP documentation for automotive-grade qualification upon request. |
| Green RoHS compliance | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); meets EU RoHS 3 and automotive environmental requirements. |
Applications
| Audio Power Amplifier Output Stage | Industrial Relay Driver |
|---|---|
|
Use Scenario: Final push-pull stage in Class AB audio amplifiers delivering 1–5W into 4–8Ω loads. IC Role / Device Role / Timing Role: PNP complement to NPN output pair; handles negative half-cycle current sinking with low VCE(sat) and high hFE. Use Value: Enables symmetrical distortion performance and thermal stability due to matched SOT89 footprint and RθJC = 27°C/W. |
Use Scenario: Driving 12V/24V electromagnetic relays in PLC I/O modules and factory automation controllers. IC Role / Device Role / Timing Role: Medium-power switch interfacing microcontroller GPIO to relay coil; provides galvanic isolation via optocoupler or direct drive. Use Value: -80V VCEO safely clamps inductive kickback spikes; -2A ICM handles relay turn-on surge without secondary snubbing. |
| DC Motor Speed Control | Automotive HVAC Blower Circuit |
|
Use Scenario: PWM-controlled H-bridge low-side or high-side switch for 12V brushed DC motors in power tools and actuators. IC Role / Device Role / Timing Role: High-current saturated switch operating at 1–20 kHz PWM; conducts up to -1A continuous during on-time. Use Value: RθJA = 60°C/W on standard PCB allows >1.5W dissipation without heatsink; fT = 150MHz ensures fast turn-off for clean PWM edges. |
Use Scenario: Blower motor speed regulation in automotive cabin climate control systems using variable-voltage or PWM control. IC Role / Device Role / Timing Role: High-side PNP switch controlling ground return path of blower motor; interfaces with LIN or discrete PWM controller. Use Value: -55°C to +150°C TJ range and AEC-Q101 manufacturability support under-dash deployment; low VCE(sat) minimizes battery drain at low speeds. |
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 |
|---|---|---|---|
| ZTX951 | VCEO = -60V, hFE = 100–300 @ -1A, TO-92 package, RθJA = 200°C/W | Lacks exposed thermal pad; unsuitable for >0.5W continuous operation without heatsink | Select only for low-power, space-constrained designs where thermal budget permits higher junction temperature rise. |
| MJD2955G | VCEO = -60V, IC = -12A, TO-220 package, RθJC = 1.5°C/W | Higher current/power capability but larger footprint and slower fT (~3 MHz) | Prefer for high-current linear regulators or >5W switching; avoid when board space or RF response is constrained. |
Compared with ZTX951 and MJD2955G, BCX53TA uniquely balances -80V blocking, SOT89 thermal efficiency (RθJA = 60°C/W), and 150MHz fT-making it optimal for compact, thermally demanding audio and industrial switching where voltage headroom and bandwidth matter.
Availability
BCX53TA is available at Aetrix Electronics and suitable for audio power amplifiers, industrial relay drivers, DC motor speed controllers, and automotive HVAC blower circuits requiring stable component supply across extended temperature and lifetime requirements.
Supply support for BCX53TA 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The BCX53TA belongs to Diodes' BCX5x PNP transistor family, engineered for medium-power linear amplification and switching in space-constrained, thermally demanding applications-including automotive, industrial, and consumer audio systems.
FAQ
What is the maximum continuous power dissipation for BCX53TA on a standard PCB?
BCX53TA delivers 2.0W maximum continuous power dissipation when mounted on 50mm × 50mm 1oz copper (per Note 7 in datasheet DS35368). On smaller copper areas-such as 15mm × 15mm-the rating drops to 1.0W. Derating curves in Figure 1 confirm linear reduction above +25°C ambient.
Does BCX53TA require a heatsink for 1A DC operation?
No external heatsink is required for 1A DC operation if the PCB provides ≥50mm × 50mm of 1oz copper connected to the exposed collector pad. At 25°C ambient, junction temperature remains below 125°C under full 1A load; thermal simulation using RθJA = 60°C/W confirms this margin.
Can BCX53TA replace BCX51TA or BCX52TA in existing designs?
Yes-BCX53TA is pin-compatible and functionally upward-compatible with BCX51TA (VCEO = -45V) and BCX52TA (VCEO = -60V), sharing identical SOT89 package, pinout, and thermal characteristics. Its higher -80V rating improves safety margin in transient-prone 24V/48V systems without layout change.
Is BCX53TA qualified for automotive applications?
BCX53TA is manufactured in IATF 16949 certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 out-of-box, Diodes offers AEC-Q101 qualification services upon request-enabling use in automotive HVAC, body control, and lighting modules with customer-specific validation.
BCX53TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 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
BCX53TA FAQ
1.How can I place an order for BCX53TA through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX53TA 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 BCX53TA reliable?
The price and inventory of BCX53TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX53TA is usually 5 days.
3.What payment methods are accepted for BCX53TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX53TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX53TA?
BCX53TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX53TA 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 BCX53TA?
For technical support, including BCX53TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX53TA requirements.
6.How does Aetrix verify that BCX53TA is sourced from the original manufacturer or authorized distributors?
All BCX53TA 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 BCX53TA meets industry standards.
7.What is the process for return or replacement of BCX53TA?
All BCX53TA units undergo pre-shipment inspection (PSI). If there is an issue with BCX53TA, 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 BCX53TA part is unused and in its original packaging.
Return procedure for BCX53TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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