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Nexperia USA Inc. BCX55,135
- Part No.:
- BCX55,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX55,135.pdf
- Description:
- TRANS NPN 60V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:3,763
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Product details
Overview
BCX55,135 from Nexperia is an NPN medium power transistor in SOT89 (SC-62) surface-mount package, rated for 60 V VCEO, 1 A continuous collector current, and 1.35 W total power dissipation with enhanced thermal performance via exposed collector pad. It serves as a low-side switch or MOSFET driver in battery-powered linear regulators and power management circuits.
For engineers reviewing the BCX55,135 datasheet, BCX55,135 pinout, BCX55,135 application, or BCX55,135 equivalent, this device is selected for robust DC switching at ≤1 A with stable hFE (63–250), low VCE(sat) (≤0.5 V @ IC = 500 mA), and thermal design flexibility across FR4 PCB mounting configurations.
Technical Context
The BCX55,135 operates as a silicon NPN bipolar junction transistor optimized for medium-power linear and switching applications. Its structure features an exposed die pad tied to the collector terminal, enabling direct thermal conduction to the PCB and reducing Rth(j-a) to 93 K/W with 6 cm² copper pad - critical for sustained 1 A operation without active cooling.
It delivers DC current gain (hFE) of 63–250 at VCE = 2 V and IC = 150 mA, with fT = 100–180 MHz and Cc = 6 pF, supporting both analog amplification and fast-switching roles in driver stages where bandwidth and saturation voltage are jointly constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in low-side switch or regulator pass transistor use. |
| IC (continuous) | 1 A - Continuous collector current rating; supports load switching up to 12 W at 12 V with appropriate heatsinking. |
| hFE | 63–250 - DC current gain range at VCE = 2 V, IC = 150 mA; enables predictable base drive sizing for saturation control. |
| VCE(sat) | ≤0.5 V @ IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in switching applications. |
| Ptot | 1.35 W - Total power dissipation with 6 cm² collector pad; sets practical thermal ceiling for ambient temperatures up to 75 °C. |
| fT | 100–180 MHz - Transition frequency confirms suitability for high-speed switching up to ~10–20 MHz with adequate gain margin. |
| Rth(j-sp) | 16 K/W - Junction-to-solder-point thermal resistance; enables accurate transient thermal modeling during pulsed operation. |
Pinout & Package
SOT89 (SC-62) plastic surface-mount package with exposed collector pad for thermal and electrical integration into PCB copper areas. Dimensions: 4.6 × 2.6 × 1.8 mm (L × W × H); lead pitch 1.5 mm; standard reflow footprint per Figure 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter (E) | Current return path; connected to ground or low-side reference; requires low-impedance trace for stability in switching. |
| 2 | Collector (C) | Main power output node; electrically and thermally tied to exposed pad; must be routed to large copper area for heat dissipation. |
| 3 | Base (B) | Control input; driven with current-limited source (e.g., resistor from MCU GPIO) to ensure IB ≥ IC/10 for saturation. |
Key Features
| Feature | Design Value |
|---|---|
| Exposed collector pad | Enables direct thermal coupling to PCB copper, reducing Rth(j-a) by up to 63% vs. standard SOT89 footprint. |
| Three hFE variants | BCX55 (63–250), BCX55-10 (63–160), BCX55-16 (100–250) - allows precise base drive optimization across production batches and temperature ranges. |
| High peak current capability | ICM = 2 A (1 ms pulse) - supports inrush current handling in motor drivers or hot-swap circuits without secondary protection. |
| Low VBE variation | VBE ≤ 1 V @ IC = 500 mA - simplifies bias network design and improves efficiency in linear regulator pass elements. |
Applications
| Linear Voltage Regulators | Power Management |
|---|---|
|
Use Scenario: Used as the series pass transistor in adjustable linear regulators (e.g., LM317-based designs) delivering up to 1 A output current. IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via emitter-follower configuration with feedback loop compensation. Use Value: Delivers <0.5 V dropout at full load and maintains thermal stability with PCB copper heatsinking, eliminating need for external heatsinks. |
Use Scenario: Integrated into multi-rail power sequencing circuits for industrial microcontrollers requiring controlled 5 V/3.3 V enable timing. IC Role / Device Role / Timing Role: Low-side enable switch controlling power delivery to downstream LDOs or DC-DC converters. Use Value: Supports clean power-up/down transitions with <200 ns turn-off delay and minimal leakage (<100 nA) during disable state. |
| Low-Side Switches | MOSFET Drivers |
|
Use Scenario: Driving resistive or inductive loads (e.g., solenoids, relays, LED strings) in automotive body control modules. IC Role / Device Role / Timing Role: Main switching element interfacing between MCU GPIO and load; handles flyback energy via external clamp diode. Use Value: Withstands 60 V transients and delivers 1 A continuous current while maintaining <0.5 V saturation voltage for efficient power transfer. |
Use Scenario: Level-shifting and current-boosting stage for driving N-channel MOSFET gates in half-bridge motor controllers. IC Role / Device Role / Timing Role: Active pull-down transistor accelerating gate discharge to reduce MOSFET turn-off time and switching losses. Use Value: Achieves <100 ns fall time with 50 mA base drive, enabling PWM frequencies up to 20 kHz without shoot-through risk. |
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 |
|---|---|---|---|
| BCP55,115 | Same SOT89 package, identical VCEO (60 V) and IC (1 A), but hFE range narrower (63–160) and Ptot lower (1.25 W). | Less suitable for high-gain analog amplification; preferred where tighter hFE tolerance reduces base drive variability. | Select when consistent low-current gain and reduced thermal budget are prioritized over maximum gain flexibility. |
| ZTX653 | TO-92 package, higher VCEO (100 V), same IC (1 A), but no exposed pad; Rth(j-a) ≈ 200 K/W (free air). | Requires mechanical heatsink for >300 mA continuous operation; unsuitable for space-constrained SMT layouts. | Choose only for through-hole legacy designs or where higher breakdown voltage justifies thermal penalty and board real estate cost. |
Compared with BCX55,135, BCP55,115 offers tighter hFE control at lower thermal capacity, while ZTX653 trades SMT compatibility and thermal performance for higher voltage headroom and through-hole assembly - making BCX55,135 optimal for compact, thermally demanding SMT power switches.
Availability
BCX55,135 is available at Aetrix Electronics and suitable for linear voltage regulators, low-side switches, and MOSFET drivers requiring stable component supply in industrial control, battery-powered instrumentation, and embedded power management systems.
Supply support for BCX55,135 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 high-volume, high-reliability logic, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with scalable manufacturing and AEC-Q200 qualified products.
The BCX55 series belongs to Nexperia's medium-power bipolar transistor product line, engineered specifically for thermally efficient SMT switching and linear regulation in space-constrained, high-reliability power interfaces.
FAQ
What is the maximum allowable junction temperature for BCX55,135?
The absolute maximum junction temperature (Tj) is 150 °C, as defined in IEC 60134 limiting values. Operation above this threshold risks permanent degradation of hFE and increased leakage. Derating curves in Figure 1 confirm safe continuous operation up to 75 °C ambient with 6 cm² collector pad.
Can BCX55,135 replace BCX55-16 in a design?
Yes - BCX55,135 and BCX55-16 share identical package, pinout, voltage/current ratings, and thermal characteristics; the only difference is hFE binning (BCX55,135 has 63–250, BCX55-16 has 100–250). Designs relying on minimum hFE ≥ 100 should verify base drive margin with BCX55,135's lower bound.
Is BCX55,135 automotive qualified?
No - BCX55,135 is not AEC-Q200 qualified. Nexperia explicitly states in Section 14 that non-automotive qualified products are unsuitable for safety-critical or life-support systems. For automotive use, consider Nexperia's AEC-Q200-compliant alternatives like PBSS4041T.
How does the exposed collector pad affect PCB layout?
The exposed pad (Pin 2) must be soldered to a dedicated, unbroken copper area ≥1 cm² (preferably 6 cm²) connected directly to the system ground or power plane. Thermal vias (≥4× 0.3 mm diameter) beneath the pad improve heat transfer to inner layers; avoid splitting the pad with traces or solder mask openings.
BCX55,135 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:
- 100 @ 150mA, 2V
- Power - Max:
- -
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89
BCX55,135 FAQ
1.How can I place an order for BCX55,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX55,135 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 BCX55,135 reliable?
The price and inventory of BCX55,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX55,135 is usually 5 days.
3.What payment methods are accepted for BCX55,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX55,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX55,135?
BCX55,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX55,135 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 BCX55,135?
For technical support, including BCX55,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX55,135 requirements.
6.How does Aetrix verify that BCX55,135 is sourced from the original manufacturer or authorized distributors?
All BCX55,135 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 BCX55,135 meets industry standards.
7.What is the process for return or replacement of BCX55,135?
All BCX55,135 units undergo pre-shipment inspection (PSI). If there is an issue with BCX55,135, 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 BCX55,135 part is unused and in its original packaging.
Return procedure for BCX55,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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