Nexperia USA Inc. BC856W,115

Overview

BC856W from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 (SC-70) package, rated for −65 V V_CEO, −100 mA I_C, and DC current gain (h_FE) of 125–475 at V_CE = −5 V, I_C = −2 mA. It serves as a low-power switching or linear amplification device in compact consumer and industrial signal-path circuits.

For engineers reviewing the BC856W datasheet, BC856W pinout, BC856W application, or BC856W equivalent, key selection criteria include its PNP polarity, SOT323 footprint compatibility, −65 V breakdown rating, −100 mA continuous collector current capability, and h_FE range suitable for bias-stable low-current amplification stages.

Technical Context

The BC856W operates as a discrete silicon PNP BJT with base-emitter and base-collector junctions optimized for general-purpose analog and digital switching. Its structure supports operation up to 150 °C junction temperature and exhibits typical V_BE(sat) of −850 mV at I_C = −100 mA, I_B = −5 mA.

Thermal resistance R_th(j-a) is 625 K/W on FR4 PCB (single-sided, 35 µm Cu), and it delivers f_T ≥ 100 MHz at V_CE = −5 V, I_C = −10 mA, enabling use in low-frequency RF and fast-switching applications up to several tens of MHz.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package: 1.35 mm × 1.8 mm footprint, 0.4 mm pitch, 3-terminal configuration with gull-wing leads. Designed for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Compared with BC856W, BC857W offers higher h_FE but reduced voltage margin, while BC846W provides complementary NPN functionality in identical packaging-neither is pin-compatible without schematic revision, and both require validation against original bias and switching timing constraints.

Availability

BC856W is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, audio preamplifier stages, and power supply enable switches requiring stable component supply across high-mix, low-volume production runs.

Supply support for BC856W 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 discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.

The BC856W belongs to Nexperia's general-purpose transistor family designed for cost-effective, space-efficient signal switching and amplification in consumer, industrial, and computing applications.

FAQ

Is BC856W suitable for automotive applications?

No. The BC856W is not automotive-qualified per AEC-Q101. It lacks extended temperature validation, failure-in-time (FIT) data, and stress-test compliance required for automotive use. Nexperia explicitly states non-automotive qualification in its legal disclaimers, and no automotive grade variant exists for this part number.

What is the maximum safe operating temperature for BC856W?

The absolute maximum junction temperature (T_j) is 150 °C, and storage temperature ranges from −65 °C to +150 °C. Operation above 150 °C risks permanent parametric shift or catastrophic failure; derating is required above 25 °C ambient due to R_th(j-a) = 625 K/W on standard FR4 PCB.

Does BC856W have built-in ESD protection?

No. The BC856W datasheet does not specify on-chip ESD protection diodes or HBM/CDM ratings. External protection (e.g., series resistors, TVS diodes) is recommended when handling or routing in electrostatic-prone environments, especially during manual assembly or field service.

Can BC856W replace BC856B in SOT23 packages?

No. BC856W uses SOT323 (SC-70), while BC856B uses SOT23 - physically incompatible footprints with different lead pitch (0.4 mm vs. 0.95 mm) and pad layouts. Mechanical substitution would cause solder bridging or open circuits; electrical equivalence does not override mechanical non-interchangeability.