Taiwan Semiconductor Corporation S3ABHM4G

Overview

S3ABHM4G from Taiwan Semiconductor is a 3A, 50V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, 1.15V max forward voltage at 3A, 80A surge capability, and 150°C max junction temperature-used in AC/DC front-end rectification for compact SMPS and LED drivers.

For engineers reviewing the S3ABHM4G datasheet, S3ABHM4G pinout, S3ABHM4G application, or S3ABHM4G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (10°C/W), moisture sensitivity level (J-STD-020 Level 1), RoHS/halogen-free compliance, and SMB footprint compatibility with automated placement.

Technical Context

This single-die standard rectifier operates in unidirectional conduction mode with cathode-band polarity marking and exhibits 1500 ns reverse recovery time under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A test conditions. Its junction-to-lead thermal resistance of 10°C/W supports sustained 3A average forward current at lead temperatures ≤100°C.

The device delivers 10 µA max reverse leakage at 25°C and 250 µA at 125°C under rated VR, with 40 pF typical junction capacitance at 1 MHz and 4.0 V reverse bias-enabling predictable switching behavior in low-to-medium frequency (<100 kHz) power conversion stages.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with molded epoxy body (UL 94V-0), matte tin-plated leads, cathode band polarity indicator, and 0.090 g mass. Lead finish complies with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar standard rectifier applications.

Compared with MUR350 and VS-3A50, the S3ABHM4G balances lowest conduction loss, industry-standard recovery speed, and enhanced manufacturability (Level 1 moisture sensitivity), making it optimal for cost-driven, thermally constrained 50–100 kHz power supplies where ultrafast switching is unnecessary.

Availability

S3ABHM4G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and USB-C adapter designs requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for S3ABHM4G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and consumer markets.

The S3AB–S3MB series was designed specifically for cost-effective, high-reliability AC/DC front-end rectification in space-constrained power supplies-emphasizing robust surge handling, low VF, and seamless SMT integration.

FAQ

What is the maximum repetitive peak reverse voltage rating for S3ABHM4G?

The S3ABHM4G has a maximum repetitive peak reverse voltage (VRRM) rating of 50 V. This value defines the highest reverse-biased voltage the device can block repeatedly without breakdown under normal operating conditions. It is verified per the Taiwan Semiconductor datasheet Version M2102 and applies across the full operating temperature range of –55°C to +150°C. Designers must ensure circuit peak reverse voltage stays below this limit with appropriate safety margin.

Does S3ABHM4G support lead-free reflow soldering processes?

Yes, the S3ABHM4G features matte tin-plated leads compliant with J-STD-002 solderability requirements and is qualified for lead-free reflow profiles up to 260°C peak temperature. Its DO-214AA (SMB) package meets J-STD-020 Level 1 moisture sensitivity, eliminating pre-bake requirements. The device's UL 94V-0 molding compound and halogen-free construction further ensure compatibility with modern RoHS-compliant manufacturing lines.

What is the typical junction capacitance of S3ABHM4G and how does it affect circuit performance?

The S3ABHM4G exhibits a typical junction capacitance (CJ) of 40 pF measured at 1 MHz and 4.0 V reverse bias. This capacitance influences high-frequency switching behavior-particularly in snubber networks and EMI filter design-and contributes to reverse recovery charge. At 50–100 kHz operation, CJ has negligible impact on efficiency, but becomes relevant in >500 kHz topologies where lower-CJ alternatives would be preferred.

Can S3ABHM4G replace older SMB-packaged rectifiers like 1N540x in new designs?

Yes, the S3ABHM4G is a direct form-fit-function replacement for legacy through-hole rectifiers such as the 1N5408 when used in surface-mount layouts, provided the PCB pad design matches DO-214AA (SMB). It offers superior surge rating (80 A vs. 30 A), lower VF (1.15 V vs. ~1.2 V), and J-STD-020 Level 1 handling-making it ideal for upgrading existing designs to automated assembly without compromising reliability or thermal performance.

How is polarity indicated on the S3ABHM4G package?

Polarity on the S3ABHM4G is indicated by a visible cathode band printed on the molded epoxy body of the DO-214AA (SMB) package. This band aligns with the cathode terminal, which serves as the forward current exit and reverse voltage blocking node. Correct orientation is essential during placement to prevent catastrophic short-circuit failure; the band must face the positive side of the bulk capacitor or downstream switching node in standard half-wave or full-wave rectifier configurations.