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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. BCV27-QR

Name: BCV27-QR
Brand: Nexperia USA Inc.
SKU: BCV27-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCV27-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BCV27-QR.pdf

Description:: TRANS NPN DARL 30V 0.5A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:4,153

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Product details

Overview

BCV27-QR from Nexperia is an NPN Darlington transistor in SOT23 package, designed for medium-current amplification with 30 V V_CE, 500 mA I_C, and minimum DC current gain of 4000 at 500 mA - used in automotive preamplifier input stages where high gain and AEC-Q101 qualification are required.

For engineers reviewing the BCV27-QR datasheet, BCV27-QR pinout, BCV27-QR application, or BCV27-QR equivalent, key selection criteria include guaranteed h_FE ≥ 4000 at full rated current, AEC-Q101 qualification status, thermal resistance (R_th(j-a) = 500 K/W), and SOT23 footprint compatibility with space-constrained PCB layouts.

Technical Context

The BCV27-QR implements a monolithic NPN Darlington pair structure, delivering high current gain without external bias networks. Its V_CE = 30 V and V_CBO = 40 V support operation in 24 V automotive supply rails with margin, while its 150 °C maximum junction temperature enables under-hood deployment.

It operates as a single-stage current amplifier with base-emitter turn-on voltage ≤ 1.4 V and saturation voltage ≤ 1.0 V at I_C = 100 mA / I_B = 0.1 mA - enabling direct drive from low-voltage logic or microcontroller GPIOs without level-shifting.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CE	30 V - supports 24 V automotive systems with 25 % headroom against transients
I_C	500 mA continuous - sufficient for driving small relays, LED arrays, or sensor interface buffers
h_FE	≥ 4000 at I_C = 500 mA - enables single-transistor gain staging without cascaded amplifiers
V_CE(sat)	≤ 1.0 V - minimizes power loss and self-heating during switching or linear operation
R_th(j-a)	500 K/W - requires minimal copper area on FR4 PCB for thermal management
AEC-Q101	Qualified - validated for automotive temperature cycling, humidity, and mechanical stress per standard

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with gull-wing leads; optimized for reflow soldering per IPC-7095 guidelines.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Input control terminal; requires ≤ 0.1 mA base drive to switch 100 mA collector current
2	Emiter	Common emitter node; connects to ground or low-side return path in amplifier/switch configurations
3	Collector	Output current terminal; handles up to 500 mA continuous load with ≤ 1 V drop at full current

Key Features

Feature	Design Value
High DC current gain	h_FE ≥ 4000 at I_C = 500 mA - eliminates need for multi-stage gain blocks in signal conditioning paths
AEC-Q101 qualification	Validated for automotive use including temperature cycling, HAST, and mechanical shock - reduces qualification burden for Tier-1 designs
Low V_BE(sat)	≤ 1.5 V at I_C = 100 mA / I_B = 0.1 mA - compatible with 3.3 V and 5 V logic-level drive without base resistors
Thermal robustness	T_j(max) = 150 °C - enables operation in engine bay environments with ambient up to 125 °C

Applications

Automotive Preamplifier Input Stage

Low-Voltage Sensor Interface

Use Scenario: Amplifying weak analog signals from crankshaft position sensors or cabin temperature sensors before ADC sampling.

IC Role / Device Role / Timing Role: NPN Darlington configured as common-emitter DC-coupled amplifier with fixed bias network.

Use Value: High h_FE ensures stable gain across temperature without feedback compensation components.

Use Scenario: Buffering and level-shifting output of thermistor-based HVAC sensors into 3.3 V microcontroller inputs.

IC Role / Device Role / Timing Role: Emitter-follower voltage buffer with unity gain and low output impedance.

Use Value: V_BE(on) ≤ 1.4 V allows direct connection to 3.3 V rail without pull-up resistors or clamping diodes.

Small Relay Driver

LED Array Current Booster

Use Scenario: Driving 12 V/200 mA electromagnetic relays in body control modules using MCU GPIO pins.

IC Role / Device Role / Timing Role: Low-side switch with base resistor integrated into PCB layout.

Use Value: I_C = 500 mA rating provides 2.5× safety margin over relay coil current, reducing thermal derating concerns.

Use Scenario: Boosting current for 5-segment status LED arrays in instrument clusters requiring uniform brightness.

IC Role / Device Role / Timing Role: Constant-current sink configured with emitter resistor for precise LED current control.

Use Value: V_CE(sat) ≤ 1.0 V limits power dissipation to < 100 mW per channel at 100 mA, avoiding heatsinking.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BCV29-Q	NPN Darlington with higher V_CE = 60 V but lower h_FE min = 2000 at 500 mA	Better suited for 48 V commercial vehicle systems; less suitable for low-noise preamp stages	Select when higher breakdown voltage is critical and gain stability at full current is secondary
MMDT3904	Single NPN BJT (not Darlington); h_FE = 100–300 at 10 mA, not rated for 500 mA continuous	Requires base current scaling and external gain staging; unsuitable for direct 500 mA switching	Only consider for low-current (<50 mA), non-automotive applications where cost outweighs performance

Compared with BCV29-Q and MMDT3904, the BCV27-QR uniquely delivers AEC-Q101 qualification, guaranteed h_FE ≥ 4000 at full 500 mA load, and SOT23 compatibility - making it the only option qualified for automotive preamplifier and relay driver roles requiring both high gain and reliability.

Availability

BCV27-QR is available at Aetrix Electronics and suitable for automotive preamplifier input stages, low-voltage sensor interfaces, and small relay drivers requiring stable component supply across production lifecycles.

Supply support for BCV27-QR 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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

The BCV27-QR belongs to Nexperia's AEC-Q101-qualified discrete transistor portfolio, engineered specifically for automotive signal amplification and interface functions where gain stability, thermal resilience, and footprint efficiency are critical.

FAQ

Is BCV27-QR pin-compatible with BCV27?

Yes - BCV27-QR shares identical SOT23 pinning (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector) and mechanical dimensions with BCV27. The "-QR" suffix denotes enhanced AEC-Q101 qualification and tighter h_FE binning, but electrical and physical compatibility is maintained.

What is the maximum allowable base current for continuous operation?

The peak base current rating is 100 mA (single pulse, t_p ≤ 1 ms), but for continuous DC operation, base current must be limited to ensure I_C ≤ 500 mA and junction temperature remains ≤ 150 °C. At I_C = 500 mA and h_FE = 4000, typical I_B is 125 µA - practical design uses 0.1–0.5 mA with series resistor for margin.

Can BCV27-QR be used in linear (analog) amplification mode?

Yes - its specified h_FE characteristics across I_C = 1 mA to 500 mA and V_CE = 2–5 V, plus low V_CE(sat), support stable Class-A or Class-AB operation. However, power dissipation must be managed: at 500 mA and 5 V V_CE, P_D = 2.5 W exceeds P_tot = 250 mW, so linear use requires strict V_CE limitation or active cooling.

Does BCV27-QR require a heatsink in standard SOT23 mounting?

No - with R_th(j-a) = 500 K/W and P_tot = 250 mW, the maximum junction-to-ambient temperature rise is 125 K. On standard FR4 PCB with recommended footprint (Fig. 3), junction temperature stays within 150 °C limit up to ~100 mA I_C at 25 °C ambient. For 500 mA, derating or localized copper pour is advised instead of discrete heatsinks.

BCV27-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 100µA, 100mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20000 @ 100mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BCV27-QR FAQ

1.How can I place an order for BCV27-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BCV27-QR 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 BCV27-QR reliable?

The price and inventory of BCV27-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCV27-QR is usually 5 days.

3.What payment methods are accepted for BCV27-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCV27-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCV27-QR?

BCV27-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCV27-QR 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 BCV27-QR?

For technical support, including BCV27-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCV27-QR requirements.

6.How does Aetrix verify that BCV27-QR is sourced from the original manufacturer or authorized distributors?

All BCV27-QR 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 BCV27-QR meets industry standards.

7.What is the process for return or replacement of BCV27-QR?

All BCV27-QR units undergo pre-shipment inspection (PSI). If there is an issue with BCV27-QR, 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 BCV27-QR part is unused and in its original packaging.

Return procedure for BCV27-QR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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