Nexperia USA Inc. BCM61B,215

Overview

BCM61B,215 from Nexperia is an NPN/NPN matched double transistor in SOT143B package, designed for precision current mirroring and differential amplification. It delivers per-transistor V_CEO = 45 V, h_FE = 200–450 at I_C = 2 mA, and current matching ratio (I_C1/I_E2) of 0.92–1.12 under V_CE1 = 5 V and T_amb ≤25 °C - enabling high-accuracy analog signal conditioning in compact PCB layouts.

For engineers reviewing the BCM61B,215 datasheet, BCM61B,215 pinout, BCM61B,215 application, or BCM61B,215 equivalent, key selection criteria include matched h_FE tracking across temperature, low V_BE spread (610–710 mV), and dual-transistor thermal coupling in a single 3.0 × 1.25 mm footprint - critical for bias-stable amplifier and mirror circuits.

Technical Context

The BCM61B,215 integrates two monolithically matched NPN transistors on a single die to minimize inter-transistor parameter variation with temperature and process. Its design emphasizes tight DC current gain (h_FE) correlation and consistent V_BE across both devices, with typical h_FE = 290 and V_BE = 660 mV at I_C = 2 mA and T_amb = 25 °C.

It operates with per-transistor V_CBO = 50 V and V_EBS = −1.8 V (TR2), supporting robust biasing in emitter-coupled configurations. Thermal resistance from junction-to-ambient is 321 K/W per device, enabling stable operation up to 150 °C junction temperature when mounted on FR4 PCBs.

Key Specifications

Pinout & Package

SOT143B is a 4-pin, surface-mount plastic package measuring 3.0 × 1.25 mm with 0.95 mm height and standard FR4-compatible footprint. Pin 1 serves as shared collector of TR2 and base of both transistors; Pin 2 is collector of TR1; Pins 3 and 4 are emitters of TR1 and TR2 respectively - enabling direct implementation of cascoded mirrors and differential pairs without external routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCV61,215, BCM61B,215 adds verified current matching and tighter V_BE spread for analog precision; versus BCM62B,215, it provides NPN polarity essential for high-side current sensing and common-emitter amplifiers requiring positive supply referenced outputs.

Availability

BCM61B,215 is available at Aetrix Electronics and suitable for current mirror circuits, differential amplifiers, active load configurations, and temperature-stable bias networks requiring stable component supply across industrial and instrumentation product lifecycles.

Supply support for BCM61B,215 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, reliable discrete, logic, and MOSFET solutions optimized for efficiency and miniaturization in consumer, industrial, and automotive systems.

The BCM61B,215 belongs to Nexperia's matched transistor product line, engineered specifically for analog signal integrity in precision biasing, current replication, and differential amplification where thermal and parametric tracking are critical.

FAQ

What is the maximum junction temperature for BCM61B,215?

The absolute maximum junction temperature is 150 °C, as defined in the Absolute Maximum Ratings table. Operation above this threshold risks permanent degradation of current gain matching and leakage characteristics. Derating is required above 25 °C ambient, with thermal resistance R_th(j-a) = 321 K/W per device on FR4 PCB.

Can BCM61B,215 be used in place of BCV61,215?

Yes, mechanically and electrically - but only if current matching is not required. BCM61B,215 shares identical pinout, voltage ratings, and gain range with BCV61,215, yet adds guaranteed I_C1/I_E2 ratio (0.92–1.12) and tighter h_FE correlation. Substitution without circuit review may degrade mirror accuracy.

Is BCM61B,215 RoHS compliant and lead-free?

Yes - BCM61B,215 is manufactured in compliance with RoHS Directive 2011/65/EU and is lead-free. The SOT143B package uses matte tin (Sn) termination, and all materials meet Nexperia's substance restrictions policy, including halogen-free epoxy molding compound.

How does thermal coupling affect matching performance?

Monolithic integration ensures both transistors share the same silicon die and thermal gradient, reducing mismatch caused by ambient temperature gradients. Measured current matching degrades only from 0.92–1.12 at 25 °C to 0.93–1.13 at 150 °C - confirming <1% additional error due to thermal coupling benefits.