Diodes Incorporated MMBTA42-7-F

Overview

MMBTA42-7-F from Diodes Incorporated is an NPN small-signal surface-mount transistor with 300 V VCBO, 300 V VCEO, and 500 mA IC rating, built using epitaxial planar die construction for medium-power amplification and switching in high-voltage interface stages.

For engineers reviewing the MMBTA42-7-F datasheet, MMBTA42-7-F pinout, MMBTA42-7-F application, or MMBTA42-7-F equivalent, key selection criteria include breakdown voltage margin, DC current gain at 10–30 mA, saturation voltage under 20 mA drive, thermal resistance (417 K/W), and SOT-23 lead-free terminal plating compliance.

Technical Context

This NPN bipolar junction transistor operates in linear amplification and hard-switching modes, supporting collector-emitter voltages up to 300 V while maintaining stable hFE (25–40) across 1–30 mA IC. Its 50 MHz fT enables RF preamplifier use up to low-VHF bands.

The device uses a planar epitaxial structure with isolated base-collector junctions, enabling reliable operation from –55 °C to +150 °C. Thermal derating begins at 25 °C per the 417 K/W RJA rating on FR-4 PCB with AP02001 pad layout.

Key Specifications

Pinout & Package

Package: SOT-23 (JEDEC TO-236AB), molded plastic, UL 94V-0 rated, matte tin lead-free plating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-voltage switching applications.

Compared with PN2222A-AP and BC846B,215, the MMBTA42-7-F uniquely supports 300 V operation while retaining SOT-23 compatibility-critical for space-constrained industrial power interface designs where voltage margin cannot be compromised.

Availability

MMBTA42-7-F is available at Aetrix Electronics and suitable for industrial relay drivers, AC line sensing, SMPS feedback paths, and high-voltage logic translation requiring stable component supply across extended temperature ranges.

Supply support for MMBTA42-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.

The MMBTA42-7-F belongs to Diodes' small-signal transistor product line, engineered specifically for high-voltage interface and switching applications in industrial controls, power supplies, and metering equipment.

FAQ

Is MMBTA42-7-F compatible with lead-free reflow profiles?

Yes. The MMBTA42-7-F features matte tin lead-free plating and is qualified for standard Pb-free reflow per JEDEC J-STD-020D Level 1. Peak temperature tolerance is 260 °C for 10 seconds, with no moisture preconditioning required due to its Level 1 classification.

What is the maximum continuous collector current at 100 °C ambient?

At TA = 100 °C, the maximum continuous IC is 225 mA. This is derived from the 300 mW Pd rating and 417 K/W RJA: Pd(100°C) = 300 mW × (1 − (100 − 25)/417) ≈ 225 mW, supporting ≤225 mA at VCE(SAT) ≈ 0.5 V.

Does MMBTA42-7-F have a SPICE model available?

Yes. Diodes Incorporated provides a verified SPICE model for MMBTA42 in the DS30062 datasheet (Rev. 6). It includes accurate Gummel-Poon parameters for DC transfer, switching transients, and small-signal AC response up to 50 MHz.

Can MMBTA42-7-F replace MMBTA42-7 in existing designs?

Yes-MMBTA42-7-F is a direct lead-free replacement for MMBTA42-7. Both share identical electrical specifications, SOT-23 mechanical dimensions, and thermal performance. The "-F" suffix denotes matte tin plating; no layout or firmware changes are needed for migration.