Diodes Incorporated BCV46TC

Overview

BCV46TC from Nexperia 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 BCV46TC datasheet, BCV46TC pinout, BCV46TC application, or BCV46TC equivalent, key selection criteria include verified Darlington configuration, guaranteed V_CEO derating to −60 V, SOT23 thermal performance under pulsed I_C conditions, and complementary pairing with BCV47 for push-pull output stages.

Technical Context

The BCV46TC implements a monolithic PNP Darlington pair with integrated base-emitter resistor network absent - requiring external base drive control. Its structure enables high h_FE (up to 10,000 at low I_C) while maintaining V_CE(sat) ≤ −1.0 V under moderate load, supporting fast turn-off via active base pull-down.

Rated for operation from −55 °C to +150 °C, it sustains I_CM = −800 mA peak pulse current (300 µs, ≤2% duty), with C_obo = 4.5 pF at V_CB = −10 V enabling stable RF-adjacent switching up to 200 MHz f_T.

Key Specifications

Pinout & Package

SOT23 plastic surface-mount package (3-pin, standard lead pitch 0.95 mm), compact footprint (2.9 × 1.3 × 1.0 mm), rated 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 BCV47, BCV46TC provides matched high-side switching capability in complementary designs; versus MMDT3906, it delivers >10× higher h_FE and 5× higher I_C, making it essential for robust 500 mA load control where base drive current must be minimized.

Availability

BCV46TC is available at Aetrix Electronics and suitable for relay drivers, LED current sinks, industrial sensor interfaces, and power supply enable switches requiring stable component supply across automotive, industrial automation, and building control programs.

Supply support for BCV46TC 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 standard logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The BCV46TC belongs to Nexperia's general-purpose bipolar transistor family, engineered for cost-sensitive, high-reliability switching applications demanding proven Darlington performance in miniature SOT23 packaging.

FAQ

What is the maximum pulsed collector current for BCV46TC?

The BCV46TC supports I_CM = −800 mA peak pulse current under pulsed conditions (pulse width = 300 µs, duty cycle ≤ 2%). This rating enables brief inrush current handling in relay and solenoid drive applications without thermal runaway, provided average power remains within the 330 mW P_tot limit at ambient temperature.

Does BCV46TC include an integrated base resistor?

No, BCV46TC has no internal base resistor. It is a bare Darlington transistor requiring external base current limiting or active drive circuitry. This design allows flexible biasing - such as using a microcontroller GPIO with series resistor or dedicated base driver IC - but mandates careful calculation of I_B to ensure saturation across temperature and process variation.

Can BCV46TC replace BCV26 in existing designs?

No - BCV46TC is not a drop-in replacement for BCV26. While both are PNP Darlington transistors in SOT23, BCV26 has V_CEO = −30 V and V_CB0 = −40 V, whereas BCV46TC is rated for −60 V and −80 V respectively. Substituting BCV46TC into a BCV26 design may cause over-spec operation but risks instability if layout parasitics exceed original validation scope.

What is the typical transition frequency (f_T) of BCV46TC and its design implication?

The BCV46TC has f_T = 200 MHz typical at I_C = −50 mA and V_CE = −5 V. This indicates usable bandwidth for switching frequencies up to ~10 MHz in well-designed layouts, supporting fast PWM dimming and digital signal buffering - though actual edge speed is limited by package inductance and external base drive strength, not intrinsic f_T.