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Nexperia USA Inc. BCX55TF
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- Part No.:
- BCX55TF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX55TF.pdf
- Description:
- TRANS NPN 60V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:12,000
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Product details
Overview
BCX55TF from Nexperia is an AEC-Q101-qualified NPN power bipolar transistor in SOT89 (SC-62) package, rated for 60 V VCEO, 1 A continuous collector current, and 500 mW power dissipation at Tamb ≤ 25 °C on standard FR4 PCB - used as low-side switch or MOSFET driver in automotive linear regulators.
For engineers reviewing the BCX55TF datasheet, BCX55TF pinout, BCX55TF application, or BCX55TF equivalent, key selection criteria include DC current gain (hFE = 63–250 at IC = 150 mA), VCE(sat) ≤ 500 mV at IC = 500 mA / IB = 50 mA, thermal resistance (Rth(j-a) = 250 K/W on standard footprint), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This NPN transistor operates in linear or saturated switching mode with VCEO = 60 V and IC = 1 A, supporting pulse currents up to 2 A (tp ≤ 1 ms). Its hFE range spans 63–250 depending on IC and VCE, enabling stable biasing across temperature (−55 °C to 150 °C).
Thermal performance is defined by three mounting conditions: Rth(j-a) = 250 K/W (standard footprint), 157 K/W (1 cm² collector pad), and 114 K/W (6 cm² pad). Transition frequency fT reaches 155 MHz at VCE = 5 V, IC = 50 mA, confirming suitability for medium-speed switching and analog amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - maximum safe collector-emitter voltage with base open; defines upper rail limit in low-side switch designs. |
| IC | 1 A continuous - steady-state load current capability; supports 12 V automotive solenoid drivers and regulator pass elements. |
| hFE | 63–250 - DC current gain at VCE = 2 V, IC = 150 mA; enables predictable base drive sizing for saturation control. |
| VCE(sat) | ≤ 500 mV at IC = 500 mA / IB = 50 mA - low saturation voltage minimizes conduction loss in power switching applications. |
| Ptot | 500 mW (standard FR4) - total power dissipation limit; requires thermal pad design for >500 mW operation. |
| fT | 155 MHz - transition frequency confirms usable bandwidth for audio amplifiers and fast-switching drivers. |
| Rth(j-a) | 250 K/W - junction-to-ambient thermal resistance on standard PCB; determines required copper area for thermal management. |
Pinout & Package
SOT89 (SC-62) plastic surface-mount package: 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, with integrated heat-dissipating tab on pin 2 (collector).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter (E) | Current return path; connected to ground or low-side reference in switch configurations. |
| 2 | Collector (C) | Main power output terminal; electrically and thermally tied to exposed metal tab for heatsinking. |
| 3 | Base (B) | Control input; requires current-limited drive (max IB = 200 mA) to ensure saturation without overdrive. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood use per stress test requirements - enables deployment in engine control, lighting, and body electronics. |
| Three hFE variants | BCX55T (63–250), BCX55-10T (63–160), BCX55-16T (100–250) - allows precise gain matching for production consistency and thermal stability. |
| High ICM | 2 A peak (tp ≤ 1 ms) - supports surge-current handling in motor startup or inductive load switching. |
| Low VBE | ≤ 1 V at IC = 500 mA - reduces base drive power and eases compatibility with 3.3 V/5 V logic-level controllers. |
| FR4-optimized thermal design | Specified Rth(j-a) values for 0 cm², 1 cm², and 6 cm² collector pads - provides clear PCB layout guidance for thermal margining. |
Applications
| Linear Voltage Regulators | MOSFET Drivers |
|---|---|
|
Use Scenario: Pass transistor in adjustable 5 V/12 V linear regulators for automotive infotainment modules. IC Role / Device Role / Timing Role: NPN power transistor operating in linear region to regulate output voltage via feedback-controlled base current. Use Value: Low VCE(sat) and stable hFE minimize dropout voltage and thermal drift across −40 °C to +125 °C ambient. |
Use Scenario: Gate driver stage for N-channel power MOSFETs in 12 V automotive window lift circuits. IC Role / Device Role / Timing Role: Low-side NPN switch providing high-current turn-on pulse to charge MOSFET gate capacitance rapidly. Use Value: 2 A peak collector current and 155 MHz fT enable <1 µs gate drive rise time with minimal overshoot. |
| Low-Side Switches | Power Amplifiers |
|
Use Scenario: Load switch for LED headlamp dimming control in body control modules (BCM). IC Role / Device Role / Timing Role: Saturated NPN switch connecting lamp load to ground under PWM base control. Use Value: AEC-Q101 qualification ensures reliability under vibration and thermal cycling; VCEO = 60 V accommodates load dump transients. |
Use Scenario: Class-A audio preamplifier stage in vehicle cabin speaker systems. IC Role / Device Role / Timing Role: Medium-power NPN amplifier biased in active region for signal gain with low harmonic distortion. Use Value: hFE consistency across IC = 5–500 mA and fT = 155 MHz support flat 20 Hz–20 kHz response with <0.5% THD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BCX54TF | PNP complement; same VCEO = 60 V, IC = 1 A, but inverted polarity - requires circuit topology change. | Used in high-side switching or complementary push-pull stages where PNP configuration is needed. | Select only when circuit requires PNP functionality; not a drop-in replacement for BCX55TF. |
| ZTX653 | Higher VCEO = 100 V, higher hFE = 100–800, but TO-92 package - larger footprint and lower power density than SOT89. | Suitable for industrial power supplies needing wider voltage margin, but lacks AEC-Q101 qualification. | Choose for non-automotive designs requiring >60 V headroom or higher gain; avoid where space or automotive compliance is critical. |
Compared with BCX54TF and ZTX653, BCX55TF uniquely combines AEC-Q101 qualification, SOT89 thermal efficiency, and tightly binned hFE in a compact automotive-grade NPN switch - making it optimal for space-constrained, thermally demanding automotive low-side applications.
Availability
BCX55TF is available at Aetrix Electronics and suitable for automotive linear regulators, MOSFET drivers, and low-side switches requiring stable component supply with AEC-Q101 assurance and SMT manufacturability.
Supply support for BCX55TF 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
Nexperia is a global semiconductor expert focused on essential semiconductors - delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The BCX55T series belongs to Nexperia's AEC-Q101-qualified discrete power transistor portfolio, engineered specifically for robust, thermally efficient switching and amplification in automotive underhood and body electronics.
FAQ
What is the maximum allowable base current for BCX55TF?
The absolute maximum DC base current is 200 mA, and peak base current is 300 mA for tp ≤ 1 ms. Exceeding these limits risks bond wire failure or gain degradation. For reliable saturation at IC = 1 A, typical design uses IB = 100 mA (hFE ≥ 10), verified by VCE(sat) ≤ 500 mV in datasheet Fig. 11.
Is BCX55TF suitable for switching inductive loads like relays or solenoids?
Yes - its 60 V VCEO, 2 A ICM, and built-in avalanche ruggedness (per Nexperia's internal qualification) support relay/solenoid driving with flyback diode protection. The 150 °C max junction temperature and AEC-Q101 rating ensure reliability during repeated inductive kickback events in automotive environments.
How does thermal performance vary with PCB copper area?
Rth(j-a) improves from 250 K/W (no added copper) to 157 K/W (1 cm² collector pad) and 114 K/W (6 cm² pad). This directly increases allowable continuous power: from 500 mW to 800 mW and 1100 mW respectively. Layout must match specified pad dimensions in Fig. 16 for guaranteed ratings.
Does BCX55TF have a lead-free and RoHS-compliant finish?
Yes - BCX55TF is manufactured with 100 % matte tin (Sn) lead finish, compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), enabling standard reflow soldering without special handling or baking requirements.
BCX55TF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- 63 @ 150mA, 2V
- Power - Max:
- 500 mW
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89
BCX55TF FAQ
1.How can I place an order for BCX55TF through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX55TF 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 BCX55TF reliable?
The price and inventory of BCX55TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX55TF is usually 5 days.
3.What payment methods are accepted for BCX55TF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX55TF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX55TF?
BCX55TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX55TF 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 BCX55TF?
For technical support, including BCX55TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX55TF requirements.
6.How does Aetrix verify that BCX55TF is sourced from the original manufacturer or authorized distributors?
All BCX55TF 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 BCX55TF meets industry standards.
7.What is the process for return or replacement of BCX55TF?
All BCX55TF units undergo pre-shipment inspection (PSI). If there is an issue with BCX55TF, 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 BCX55TF part is unused and in its original packaging.
Return procedure for BCX55TF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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