Diodes Incorporated BCV47QTA

Overview

BCV47QTA from Diodes Incorporated is a 60V NPN Darlington transistor in SOT23 package, designed for automotive-grade switching and amplification. It delivers h_FE ≥ 10,000 at I_C = 100mA, supports 500mA continuous collector current, and features V_CEO = 60V and V_CE(sat) ≤ 1.0V at I_C = 100mA/I_B = 0.1mA - used in body control modules for high-gain load driving.

For engineers reviewing the BCV47QTA datasheet, BCV47QTA pinout, BCV47QTA application, or BCV47QTA equivalent, key selection criteria include AEC-Q101 qualification, SOT23 thermal performance (R_θJA = 403°C/W), Darlington gain linearity across -55°C to +150°C, and complementary pairing with BCV46Q in automotive power interface designs.

Technical Context

The BCV47QTA integrates two cascaded NPN transistors in a monolithic Darlington configuration, enabling ultra-high DC current gain while maintaining single-package simplicity. Its design targets low-base-drive requirements in space-constrained automotive ECUs, where I_B ≤ 0.1mA suffices to saturate I_C = 100mA.

It operates across -55°C to +150°C with guaranteed V_CEO ≥ 60V and ESD robustness (HBM 2kV), meeting IATF 16949 manufacturing and PPAP requirements. The SOT23 package uses matte tin-plated leads and green molding compound compliant with RoHS 3 and halogen-free standards.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic package with 3-pin configuration, 0.008g mass, UL 94V-0 rating, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCV47,115 and ZTX1048A, the BCV47QTA uniquely combines AEC-Q101 compliance, SOT23 miniaturization, and Darlington gain >10k - making it the only option qualified for production automotive SMT assemblies requiring high-current, low-drive switching.

Availability

BCV47QTA is available at Aetrix Electronics and suitable for automotive body control modules, seat motor drivers, LED headlamp dimming circuits, and engine coolant fan control systems requiring stable component supply and long-term lifecycle assurance.

Supply support for BCV47QTA 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 North America.

The BCV47Q belongs to Diodes' Automotive-Grade Discrete Transistor product line, engineered specifically for AEC-Q101-compliant switching in harsh-environment vehicle subsystems such as chassis, comfort, and lighting controls.

FAQ

What is the maximum allowable continuous collector current for BCV47QTA at 100°C ambient?

At T_A = 100°C, the maximum continuous collector current is derated to approximately 280mA. This is calculated using the 403°C/W R_θJA and 310mW P_D rating: T_J(max) = 150°C → ΔT = 50°C → P_D(max) = 50/403 ≈ 124mW → I_C ≈ √(P_D/R_CE(sat)) ≈ 280mA assuming typical V_CE(sat) of 0.8V. Full derating curve is shown in Figure 1 of DS39807.

Is BCV47QTA pin-compatible with BCV46Q?

No - BCV47QTA (NPN Darlington) and BCV46Q (PNP Darlington) have identical SOT23 pinout (E-B-C), but opposite polarity. They are complementary devices intended for use in push-pull or H-bridge configurations, not direct replacements. Both share same marking code (ZFG) and thermal specs, enabling matched thermal design.

Does BCV47QTA require external base resistor stabilization?

Yes - due to Darlington architecture, BCV47QTA exhibits significant leakage (I_CBO ≤ 100nA at 150°C) and gain variation. A 10–100kΩ base-to-emitter resistor is recommended to prevent unintended turn-on from noise or leakage, especially in high-temperature automotive environments where I_CBO increases exponentially.

Can BCV47QTA be used in linear amplifier applications?

No - BCV47QTA is optimized for switching operation, not linear amplification. Its high h_FE and wide gain spread (2k–10k), combined with nonlinear V_CE(sat) vs. I_C behavior (Figure 4), make it unsuitable for precision analog gain stages. It lacks specified f_T linearity or distortion metrics required for amplification.