onsemi NST856MTWFTBG

Overview

NST856MTWFTBG from onsemi is a PNP bipolar junction transistor rated for −65 V V_CEO, −100 mA continuous collector current, and 100 MHz transition frequency, housed in an ultra-compact XDFNW3 (DFN1010−3) wettable flanks package. It serves as a general-purpose amplifier in low-power surface-mount applications where board space, optical inspection compatibility, and automotive-grade reliability are critical - such as in automotive body control modules and sensor signal conditioning circuits.

For engineers reviewing the NST856MTWFTBG datasheet, pinout, applications, or equivalent options, key selection considerations include its AEC−Q101 qualification, wettable flank geometry for AOI, −65 V breakdown rating, 220–450 h_FE range at −10 mA, and thermal resistance of 191 °C/W under standard PCB conditions.

Technical Context

This PNP transistor operates with emitter-grounded configuration in linear amplification and switching roles. Its DC current gain (h_FE) ranges from 220 to 450 at −10 mA I_C, and saturation voltage remains ≤ −0.25 V at −10 mA I_C/−0.5 mA I_B, supporting efficient low-voltage switching.

Designed for automotive optical inspection, it uses a 1.00 mm × 1.00 mm × 0.38 mm XDFNW3 package with wettable flanks and a 0.65 mm pitch. Thermal performance is characterized per JESD51−7 on FR4 with 2 oz Cu and 100 mm² pad area, yielding R_JA = 191 °C/W and P_D = 650 mW at T_A = 25°C.

Key Specifications

Pinout & Package

The NST856MTWFTBG is packaged in XDFNW3 (Case 521AC), a 3-terminal DFN1010−3 with wettable flanks, measuring 1.00 mm × 1.00 mm × 0.38 mm and 0.65 mm lead pitch. The exposed die pad is electrically connected to the collector terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT856LT1G and PN2907A, the NST856MTWFTBG delivers superior board-area efficiency, AOI-ready solder joint verification, and guaranteed automotive reliability - making it the preferred choice for new SMT designs targeting ISO/TS 16949 production environments.

Availability

NST856MTWFTBG is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, consumer appliance power sequencing, and medical diagnostic equipment requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for NST856MTWFTBG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.

The NST856MTWFTBG belongs to onsemi's NSV-qualified general-purpose transistor family, engineered specifically for automotive electronics requiring AEC−Q101 compliance, wettable flank packaging, and robust parametric performance across extended temperature ranges.

FAQ

What is the maximum operating temperature for the NST856MTWFTBG?

The NST856MTWFTBG has a specified junction and storage temperature range of −65°C to +150°C. Its thermal resistance (R_JA = 191 °C/W) means that at 650 mW power dissipation and 25°C ambient, junction temperature reaches approximately 158°C - thus derating is required above 25°C ambient to stay within the +150°C limit. Full thermal design must follow JESD51−7 test conditions using a 100 mm² 2 oz Cu pad.

Is the NST856MTWFTBG pin-compatible with the MMBT856LT1G?

No, the NST856MTWFTBG is not pin-compatible with the MMBT856LT1G. While both are PNP transistors with identical electrical specifications, the NST856MTWFTBG uses a 3-pin XDFNW3 package with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector, whereas the MMBT856LT1G uses SOT-23 with pin 1 = Emitter, pin 2 = Base, pin 3 = Collector. PCB layout redesign is required for substitution.

Does the NST856MTWFTBG require a heatsink in typical operation?

In most applications drawing ≤100 mA at ≤5 V V_CE, the NST856MTWFTBG does not require an external heatsink. Its 650 mW power dissipation rating and 191 °C/W R_JA allow safe operation up to ~85°C ambient when mounted on a standard 100 mm² 2 oz Cu pad. For sustained >300 mW dissipation or ambient >70°C, thermal simulation and optional copper pour enhancement are recommended.

What does the "TWFT" suffix indicate in NST856MTWFTBG?

The "TWFT" suffix in NST856MTWFTBG denotes onsemi's wettable flank tape-and-reel packaging format: "T" = tape-and-reel, "W" = wettable flanks, "F" = Pb-free, "T" = standard temperature grade. The final "BG" indicates the specific marking code and packaging variant per onsemi's ordering nomenclature, confirming compliance with automotive AOI requirements.

Can the NST856MTWFTBG be used in linear amplifier configurations?

Yes, the NST856MTWFTBG is explicitly designed for general-purpose amplifier applications. Its h_FE of 220–450 at −10 mA I_C, low noise figure (1.0 dB typical), and stable f_T of 100 MHz support Class-A and Class-AB linear amplification in sensor interface and audio preamp stages - provided proper biasing, thermal management, and stability compensation are implemented per the device's safe operating area curves.