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Nexperia USA Inc. BCX51TF
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- Part No.:
- BCX51TF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX51TF.pdf
- Description:
- TRANS PNP 45V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:6,500
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Product details
Overview
BCX51TF from Nexperia is a PNP power bipolar transistor in SOT89 (SC-62) package, rated for −45 V VCEO, −1 A continuous collector current, and 1100 mW power dissipation with 6 cm² copper pad. It delivers hFE = 63–250 at VCE = −2 V and IC = −150 mA, and is AEC-Q101 qualified for automotive-grade reliability in high-side switch and linear regulator applications.
For engineers reviewing the BCX51TF datasheet, BCX51TF pinout, BCX51TF application, or BCX51TF equivalent, this device supports precise current gain selection, thermal robustness on FR4 PCBs, and stable operation across −55 °C to +150 °C ambient range - critical for power management and MOSFET driver designs requiring rugged PNP switching.
Technical Context
This PNP transistor operates in linear and saturation regions with verified VCE(sat) ≤ −500 mV at IC = −500 mA / IB = −50 mA and fT = 140 MHz at VCE = −5 V / IC = −50 mA. Its junction-to-ambient thermal resistance is 114 K/W under optimized 6 cm² mounting, enabling sustained 1 A conduction without forced cooling.
The device features low leakage: ICBO ≤ −10 μA at Tj = 150 °C and IEBO ≤ −100 nA, with breakdown ratings of −45 V V(BR)CEO and −5 V V(BR)EBO. Its pulsed peak current capability reaches −2 A (tp ≤ 1 ms), supporting transient load handling in power control circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage with open base; defines upper rail limit in high-side switch configurations. |
| IC | −1 A continuous: Sustained DC current handling capacity; enables direct drive of medium-power loads without heatsinking under derated conditions. |
| hFE | 63–250 at VCE = −2 V, IC = −150 mA: Three gain variants support precise biasing in amplifier and regulator feedback paths. |
| Ptot | 1100 mW with 6 cm² copper pad: Highest power dissipation rating among SOT89 PNP transistors in this series; reduces thermal margin risk in compact layouts. |
| fT | 140 MHz: Enables use in medium-frequency switching and analog amplification up to ~10 MHz small-signal bandwidth. |
| Rth(j-a) | 114 K/W (6 cm² pad): Confirmed thermal resistance enables accurate junction temperature prediction for lifetime and reliability modeling. |
Pinout & Package
SOT89 (SC-62) plastic surface-mount package: 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, single-sided copper FR4 mounting. Collector tab is electrically connected to Pin 2 and thermally enhanced via large copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter (E) | Current sink terminal; connects to load return or ground reference; polarity defines PNP conduction direction. |
| 2 | Collector (C) | Main power output terminal; electrically and thermally tied to exposed metal tab; requires ≥6 cm² copper for full 1100 mW rating. |
| 3 | Base (B) | Control input; accepts negative bias current to turn on; typical drive: −50 mA for −500 mA collector conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications per stress test standard; eliminates need for additional qualification effort in Tier-1 designs. |
| Three hFE variants | BCX51T (63–250), BCX51-10T (63–160), BCX51-16T (100–250): Enables gain-matched pairs or precision loop gain tuning without external resistors. |
| High pulse current rating | −2 A peak (tp ≤ 1 ms): Supports inrush current limiting and short-duration overload protection in power supplies. |
| Low VCE(sat) | ≤ −500 mV at IC/IB = 10: Minimizes conduction loss and self-heating during saturated switching in linear regulators. |
| Thermal derating clarity | Published curves for 3 mounting conditions (standard, 1 cm², 6 cm²): Enables accurate thermal design without iterative testing. |
Applications
| Linear Voltage Regulators | MOSFET Drivers |
|---|---|
|
Use Scenario: Pass transistor in adjustable positive LDOs or tracking pre-regulators where emitter-follower topology provides low dropout and high PSRR. IC Role / Device Role / Timing Role: PNP pass element controlling output voltage via base bias; operates in linear region with continuous −1 A current capability. Use Value: Delivers <100 mV dropout at full load due to low VCE(sat), while maintaining stability across temperature with predictable hFE variation. |
Use Scenario: Level-shifting and current-boosting stage driving N-channel high-side MOSFET gates in half-bridge or buck controllers. IC Role / Device Role / Timing Role: High-current PNP switch sinking gate charge during turn-off; complements NPN/NMOS logic-level inputs. Use Value: −500 mV VCE(sat) ensures fast gate discharge with minimal Miller effect, enabling >100 kHz switching in industrial motor drives. |
| High-Side Switches | Power Management |
|
Use Scenario: Load switch for 12 V/24 V automotive subsystems (e.g., lighting, sensors) requiring reverse-polarity and overcurrent protection. IC Role / Device Role / Timing Role: Main current path switch controlled by microcontroller GPIO through base resistor; handles inductive kickback via built-in VCEO rating. Use Value: −45 V rating accommodates load dump transients up to ISO 7637-2 Pulse 5a; AEC-Q101 ensures 15-year field reliability. |
Use Scenario: Current mirror, bias generator, or error amplifier in multi-rail PMICs for industrial PLCs and embedded controllers. IC Role / Device Role / Timing Role: Precision current source/sink element leveraging matched hFE variants; operates in active region with low leakage (<100 nA). Use Value: Tight hFE spread (±20%) and low IEBO enable <0.5% current matching across temperature, improving regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BCX56-16T | Higher VCEO (−80 V), same SOT89 package, hFE 100–250 | Supports higher bus voltages (e.g., 48 V systems); lower fT (100 MHz) limits high-frequency use | Select when operating above 45 V or needing extended voltage margin; verify thermal layout compatibility. |
| ZTX753 | TO-92 package, −100 V VCEO, −2 A IC, hFE 100–800 | Through-hole mounting only; higher power but larger footprint and no AEC-Q101 qualification | Choose for prototyping or non-automotive applications requiring higher current or voltage; not drop-in compatible. |
Compared with BCX51TF, BCX56-16T extends voltage headroom for 48 V architectures but trades off RF performance, while ZTX753 offers higher current and gain flexibility at the cost of surface-mount compatibility and automotive qualification.
Availability
BCX51TF is available at Aetrix Electronics and suitable for linear voltage regulators, MOSFET drivers, and high-side switches requiring stable component supply, AEC-Q101 compliance, and SOT89 thermal performance.
Supply support for BCX51TF 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 efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
BCX51TF belongs to the BCX51T series of AEC-Q101-qualified PNP power transistors designed specifically for automotive and industrial power control applications demanding ruggedness, thermal predictability, and gain consistency.
FAQ
What is the maximum allowable junction temperature for BCX51TF?
The absolute maximum junction temperature (Tj) is 150 °C per IEC 60134 limiting values. Operation at this temperature requires strict thermal design: Rth(j-a) must be ≤114 K/W, achievable only with a 6 cm² copper pad on FR4. Derating begins at Tamb > 75 °C per Figure 1.
Is BCX51TF pin-compatible with BCX51-10T or BCX51-16T?
Yes - all BCX51T-series variants share identical SOT89 pinout (Emitter–Collector–Base), mechanical dimensions, and thermal footprint. Only DC current gain (hFE) differs: BCX51TF is the base variant (63–250), while -10T and -16T offer tighter spreads (63–160 and 100–250 respectively).
Does BCX51TF require a heatsink in standard SOT89 mounting?
No dedicated heatsink is required if mounted per Nexperia's recommended 6 cm² copper pad on FR4 - this achieves the full 1100 mW rating. With standard footprint (no extended pad), Ptot drops to 500 mW; thermal simulation or IR measurement is advised for >500 mW continuous dissipation.
Can BCX51TF replace BCX51 in legacy through-hole designs?
No - BCX51 uses TO-92 package with different pinout (E-B-C) and thermal behavior. BCX51TF is SOT89-only and not mechanically or thermally interchangeable. For drop-in replacement, consider SOT89-compatible alternatives like BCX56T or redesign the footprint and thermal layout.
BCX51TF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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):
- 45 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
BCX51TF FAQ
1.How can I place an order for BCX51TF through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX51TF 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 BCX51TF reliable?
The price and inventory of BCX51TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX51TF is usually 5 days.
3.What payment methods are accepted for BCX51TF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX51TF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX51TF?
BCX51TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX51TF 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 BCX51TF?
For technical support, including BCX51TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX51TF requirements.
6.How does Aetrix verify that BCX51TF is sourced from the original manufacturer or authorized distributors?
All BCX51TF 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 BCX51TF meets industry standards.
7.What is the process for return or replacement of BCX51TF?
All BCX51TF units undergo pre-shipment inspection (PSI). If there is an issue with BCX51TF, 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 BCX51TF part is unused and in its original packaging.
Return procedure for BCX51TF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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