Nexperia USA Inc. BCV61B,235

Overview

BCV61B,235 from Nexperia is an NPN general-purpose double transistor in SOT143B package, configured as a matched pair of monolithic NPN transistors (TR1 and TR2) for precision current mirroring and temperature-stable biasing. It supports V_CEO = 30 V, I_C = 100 mA per transistor, h_FE = 200–450 at I_C = 2 mA, and exhibits <0.3× thermal drift in V_BE matching across −55 °C to +150 °C. Used in analog front-ends of industrial sensor signal conditioning circuits.

For engineers reviewing the BCV61B,235 datasheet, BCV61B,235 pinout, BCV61B,235 application, or BCV61B,235 equivalent, this device is selected for dual-transistor functions requiring matched h_FE, low V_CE(sat) (<250 mV at 10 mA), tight IC1/IE2 current ratio (0.7–1.3), and SMT-compatible thermal performance on FR4 PCBs.

Technical Context

The BCV61B integrates two electrically isolated NPN transistors on a single die with shared thermal mass, enabling intrinsic matching of DC current gain (h_FE = 200–450), base-emitter voltage (ΔV_BE < 2 mV over temperature), and saturation characteristics. Its pinning separates collector (Pin 1 for TR2, Pin 2 for TR1), emitter (Pin 3 for TR1, Pin 4 for TR2), and shares base connection (Pin 1 also serves as base for both transistors).

This configuration supports direct implementation of current mirrors without external resistor balancing, with guaranteed current matching (IC1/IE2 = 0.7–1.3) at I_E2 = −0.5 mA and V_CE1 = 5 V. Thermal resistance R_th(j-a) = 500 K/W enables stable operation up to T_j = 150 °C on standard FR4 boards.

Key Specifications

Pinout & Package

SOT143B is a 4-pin surface-mount plastic package measuring 3.0 × 1.4 × 1.1 mm (L × W × H), with gull-wing leads optimized for reflow soldering on FR4 PCBs. Pin pitch is 0.95 mm; lead coplanarity ≤0.1 mm ensures reliable solder joint formation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCV61A and BCV61C, the BCV61B offers mid-range h_FE (200–450) that balances noise, bandwidth, and drive capability-ideal for general-purpose current mirrors where moderate gain and wide operating margin are prioritized over extremes.

Availability

BCV61B,235 is available at Aetrix Electronics and suitable for current mirror circuits, temperature-stable bias networks, and active load implementations requiring stable component supply and consistent parametric matching across production lots.

Supply support for BCV61B,235 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 delivering high-performance logic, discrete, and MOSFET devices with focus on efficiency, reliability, and miniaturization for industrial and automotive markets.

The BCV61 series belongs to Nexperia's general-purpose bipolar transistor product line, engineered specifically for matched-pair analog functions including current mirroring, bias stabilization, and active load applications in space-constrained SMT designs.

FAQ

What is the maximum junction temperature for BCV61B,235?

The absolute maximum junction temperature is 150 °C, verified per IEC 60134 limiting values. Operation at this temperature requires derating total power dissipation to ≤125 mW on FR4 PCBs, based on R_th(j-a) = 500 K/W. Thermal simulation or board-level testing is recommended for sustained 150 °C junction operation.

Can BCV61B,235 be used in a Widlar current source configuration?

Yes-its matched V_BE and h_FE enable accurate Widlar implementation using external emitter degeneration resistors on Pin 3 (TR1 emitter) and Pin 4 (TR2 emitter). The monolithic structure ensures <1% relative change in ΔV_BE across temperature, preserving output current accuracy better than discrete solutions.

Is the base connection truly shared between both transistors?

Yes-Pin 1 serves as the base terminal for both TR1 and TR2, confirmed in Table 2 "Pinning" and Figure 15 of the datasheet. This shared base architecture is fundamental to its use in current mirrors and eliminates inter-transistor base wiring, reducing parasitic inductance and layout sensitivity.

How does BCV61B,235 handle reverse voltage on the emitter terminals?

TR2's emitter (Pin 4) is rated for V_EBS = −1.8 V at I_E2 = −250 mA, meaning it tolerates up to 1.8 V reverse bias before breakdown. TR1's emitter (Pin 3) has no specified reverse rating beyond standard V_EBO = 6 V, so reverse operation should be avoided unless externally clamped.