Toshiba Semiconductor and Storage HN1C03FU-B,LF

Overview

HN1C03FU-B,LF from Toshiba is a dual NPN epitaxial silicon transistor in US6 package, designed for audio muting and signal switching applications. It features VEBO = 25 V (min), RON = 1 Ω (typ. at IB = 5 mA), and reverse hFE = 150 (typ. at VCE = −2 V, IC = −4 mA), enabling low-loss analog switching in compact consumer audio systems.

For engineers reviewing the HN1C03FU-B,LF datasheet, HN1C03FU-B,LF pinout, HN1C03FU-B,LF application, or HN1C03FU-B,LF equivalent, key selection criteria include dual-transistor integration in US6, guaranteed reverse hFE performance, low VCE(sat) of 0.042 V (typ.), high fT of 30 MHz, and muting-specific reliability under repetitive bias stress.

Technical Context

This device integrates two identical NPN transistors in a single US6 (6-pin ultra-super-mini) package with common emitter-base isolation. Its PCT process ensures stable hFE classification (A: 200–700 / B: 350–1200) and low Cob = 4.8 pF (typ.) for minimal capacitive loading in audio paths.

Designed for bidirectional analog switching, it supports both forward-active (hFE = 200–1200) and reverse-active operation (reverse hFE = 150 typ.), with fast switching times: ton = 160 ns, tf = 130 ns, and tstg = 500 ns - critical for clean mute/unmute transitions without pop noise.

Key Specifications

Pinout & Package

HN1C03FU-B,LF is housed in a 6-pin US6 (ultra super mini) surface-mount package, measuring 1.6 × 1.6 × 0.7 mm, with 6.8 mg typical weight. Pin numbering follows top-view marking as shown in Toshiba's official datasheet (Rev. 2014-03-01, Page 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HN1C03FU-B,LF, HN1C01FU-B,LF trades bandwidth and reverse-mode assurance for lower cost, while UMX2N offers speed at the expense of muting-grade reverse-voltage capability-making HN1C03FU-B,LF uniquely balanced for reliable, low-noise analog switching in space-constrained consumer audio.

Availability

HN1C03FU-B,LF is available at Aetrix Electronics and suitable for audio muting, headphone detection, and line-level signal routing applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for HN1C03FU-B,LF 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs for consumer, industrial, and automotive applications.

HN1C03FU-B,LF belongs to Toshiba's legacy PCT-process dual-transistor family, engineered specifically for low-distortion, low-pop analog switching in compact portable audio systems since 1990.

FAQ

What is the primary function of the HN1C03FU-B,LF in audio systems?

The HN1C03FU-B,LF serves as a dual NPN analog switch optimized for silent audio muting and signal routing. Its low VCE(sat) of 0.042 V (typ.) and fast fall time of 130 ns enable clean, pop-free transitions in speaker and headphone paths. The device is explicitly rated for muting applications in Toshiba's datasheet, and its reverse hFE = 150 (typ.) supports reliable bidirectional conduction-key for minimizing distortion in AC-coupled audio lines.

Does the HN1C03FU-B,LF support reverse-active operation, and how is it validated?

Yes, the HN1C03FU-B,LF supports reverse-active operation with a specified reverse hFE = 150 (typ.) at VCE = −2 V and IC = −4 mA. This parameter is measured and published in Toshiba's official Electrical Characteristics table (Page 2, Rev. 2014-03-01). It is not inferred-it is a tested, guaranteed specification enabling predictable gain when the collector and emitter roles are swapped in muting configurations.

What is the package type and pin compatibility of the HN1C03FU-B,LF?

HN1C03FU-B,LF uses the US6 (ultra super mini) 6-pin surface-mount package, measuring 1.6 × 1.6 × 0.7 mm. Its pinout is fixed and documented in Toshiba's marking diagram (Page 3, Rev. 2014-03-01): Pins 1/2/3 serve Q1 (E/B/C), and Pins 4/5/6 serve Q2 (C/B/E). No alternate pinouts or variants exist for this part number-pin compatibility is absolute within the HN1CxxFU series sharing the US6 footprint.

Can the HN1C03FU-B,LF be used in place of a single-transistor switch?

Yes, but only one half (Q1 or Q2) should be used if a single switch is needed-Pins 1–3 or Pins 4–6 form fully independent NPN pairs. Unused pins must remain unconnected or grounded per design; floating bases are prohibited. The HN1C03FU-B,LF is not a drop-in replacement for single-transistor SOT-363 parts due to different internal connectivity (e.g., shared thermal mass, matched hFE binning), so layout reuse requires verification of signal routing and thermal constraints.

Is the HN1C03FU-B,LF RoHS compliant and lead-free?

Yes, the "-B,LF" suffix explicitly denotes lead-free (Pb-free) and RoHS-compliant construction per Toshiba's product nomenclature. The device meets EU RoHS Directive 2011/65/EU requirements, with homogeneous material analysis confirming cadmium, lead, mercury, hexavalent chromium, PBB, and PBDE levels below threshold limits. Full compliance documentation is available upon request from Aetrix Electronics or Toshiba's environmental portal.