Diodes Incorporated BCV46TA

Overview

BCV46TA from Diodes Incorporated is a PNP silicon planar Darlington transistor in SOT23 package, rated for V_CEO = −60 V, I_C = −500 mA, and V_CE(sat) = −1.0 V at I_C = −100 mA / I_B = −0.1 mA. It delivers high DC current gain (h_FE ≥ 2,000 at I_C = −10 mA) and low saturation voltage for efficient switching in low-voltage power control circuits.

For engineers reviewing the BCV46TA datasheet, BCV46TA pinout, BCV46TA application, or BCV46TA equivalent, key selection factors include its Darlington configuration for high current amplification, −60 V V_CEO rating for industrial relay drivers, thermal robustness to +150 °C, and SOT23 footprint compatibility with space-constrained PCB layouts.

Technical Context

The BCV46TA integrates two cascaded PNP transistors in a monolithic Darlington pair, enabling high h_FE (up to 10,000) while maintaining low V_CE(sat). Its structure supports direct base drive without external bias resistors in many configurations.

Rated for continuous operation up to +150 °C and pulsed I_C of −800 mA, it is optimized for DC-coupled switching rather than RF or linear amplification - confirmed by f_T = 200 MHz (measured at −50 mA, −5 V) and C_obo = 4.5 pF at −10 V.

Key Specifications

Pinout & Package

BCV46TA is housed in a standard SOT23 plastic surface-mount package with gull-wing leads, measuring 2.9 mm × 1.3 mm × 1.0 mm (L × W × H), and specified for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCV47TA, BCV46TA provides high-side sourcing capability essential for positive-rail switching; versus MMDT3906, it delivers 10× higher current gain and double the continuous current rating, making it irreplaceable in demanding industrial load control.

Availability

BCV46TA is available at Aetrix Electronics and suitable for industrial relay drivers, automotive door lock actuators, LED string current sinks, and power supply enable switches requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BCV46TA 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 and manufacturing operations across Asia and the Americas.

The BCV46TA belongs to Diodes' legacy bipolar transistor portfolio, engineered specifically for cost-sensitive, high-reliability DC switching applications in industrial and automotive subsystems.

FAQ

Is BCV46TA RoHS compliant and halogen-free?

Yes, BCV46TA meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The SOT23 package uses matte tin lead finish and green molding compound, with full compliance documentation available upon request.

Can BCV46TA be used in linear amplifier configurations?

No - BCV46TA is characterized and qualified exclusively for switching operation. Its Darlington structure introduces significant phase shift and nonlinearity; f_T is measured under small-signal conditions but not guaranteed for linear gain stability. Use dedicated amplifier transistors like BC847 for analog stages.

What is the maximum safe operating area (SOA) for BCV46TA at 100 °C ambient?

At T_amb = 100 °C, derated P_tot is 198 mW. The SOA boundary is defined by V_CE ≤ 60 V, I_C ≤ 500 mA, and V_CE × I_C ≤ 198 mW in DC mode. Pulse operation (≤2% duty, 300 µs width) extends I_C to −800 mA within V_CE ≤ 30 V.

Does BCV46TA require a base resistor when driven directly from a 3.3 V MCU GPIO?

Yes - a series base resistor is mandatory. With V_BE(sat) ≈ −1.5 V and typical GPIO sink capability of 20 mA, a 100 Ω resistor limits base current to ~18 mA, ensuring saturation at I_C up to −500 mA. Omitting it risks excessive base current and device failure.