Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation S1GALH

Name: S1GALH
Brand: Taiwan Semiconductor Corporation
SKU: S1GALH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: S1GALH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: S1GALH.pdf

Description:: DIODE GEN PURP 400V 1A THIN SMA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,890

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

S1GALH from Taiwan Semiconductor is a 1 A, 400 V repetitive peak reverse voltage (V_RRM) glass-passivated standard surface-mount rectifier in a Thin SMA package, featuring 30 A surge current capability, 150 °C maximum junction temperature, and AEC-Q101 qualification for automotive-grade reliability in freewheeling and snubber circuits.

For engineers reviewing the S1GALH datasheet, S1GALH pinout, S1GALH application, or S1GALH equivalent, this device is selected for DC/DC converter output rectification, automotive power supply clamping, and high-reliability industrial flyback diode roles where low forward voltage (0.96 V @ 1 A, 25 °C), low leakage (<1 µA @ 25 °C), and moisture-insensitive level-1 MSL packaging are critical.

Technical Context

The S1GALH is a single-die, unidirectional silicon PN junction rectifier optimized for fast recovery in medium-voltage switching applications. Its glass-passivated junction ensures stable reverse leakage across -55 °C to +150 °C operating range and supports automated SMT placement due to its low-profile Thin SMA outline and matte tin-plated leads compliant with J-STD-002.

Thermal performance is characterized by R_θJL = 29 °C/W and R_θJA = 82 °C/W on a 5 mm × 5 mm Cu pad PCB, enabling sustained 1 A average forward current under natural convection. The device exhibits C_J = 8 pF at 1 MHz / 4 V, supporting moderate-frequency switching without excessive capacitive loading.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive reverse blocking voltage; defines safe DC/DC output clamp level and snubber voltage rating.
I_F	1 A - Continuous average forward current; supports compact layout in space-constrained automotive modules.
I_FSM (8.3 ms)	30 A - Non-repetitive surge rating; handles inrush and transient overloads in power supply startup.
V_F @ 1 A, 25 °C	0.96 V (max) - Low conduction loss; reduces thermal stress and improves efficiency in 12 V–48 V systems.
I_R @ 400 V, 25 °C	<1 µA - Minimal leakage; preserves energy in hold-up and standby circuits.
T_J max	+150 °C - High-temperature operation enables under-hood automotive use without derating.
MSL Level	Level 1 (per J-STD-020) - No floor life limitation; simplifies SMT line logistics and inventory management.

Pinout & Package

Thin SMA package: surface-mount, single-anode/single-cathode configuration with cathode indicated by band; dimensions per TSC package drawing; matte tin-plated leads, UL 94V-0 molding compound, 0.029 g weight.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); must withstand 30 A surge pulses.
Cathode	Forward current exit / reverse blocking terminal	Connected to output rail or clamp reference; marked by visible band; carries full load current and blocks 400 V reverse.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive power electronics including engine control units and body controllers.
Glass-passivated junction	Ensures long-term stability of reverse leakage and breakdown voltage under thermal cycling and humidity exposure.
Thin SMA package	0.95 mm profile enables ultra-thin power modules and compatibility with fine-pitch automated placement equipment.
Level 1 moisture sensitivity	Eliminates bake requirements before reflow, reducing manufacturing cost and handling risk.
Halogen-free (IEC 61249-2-21)	Meets automotive OEM environmental compliance mandates without compromising flame retardancy (UL 94V-0).

Applications

Automotive DC/DC Converter Output Rectification	Industrial Snubber Network
Use Scenario: Rectifying switched output in 12 V → 5 V/3.3 V buck converters within ADAS camera modules. IC Role / Device Role / Timing Role: Freewheeling diode providing current path during high-side MOSFET off-time; operates at ~200–500 kHz. Use Value: 0.96 V V_F minimizes conduction loss; 150 °C T_J rating sustains operation near heat-generating image sensors.	Use Scenario: Suppressing voltage spikes across IGBTs in motor drive inverters for HVAC blowers. IC Role / Device Role / Timing Role: Snubber diode clamping inductive kickback; absorbs energy during turn-off transitions. Use Value: 30 A I_FSM handles repetitive transients; 400 V V_RRM exceeds bus voltage margin for 24 V systems.
On-Board Charger (OBC) Auxiliary Supply	LED Driver Flyback Secondary
Use Scenario: Providing isolated auxiliary bias supply for gate drivers and controllers in EV on-board chargers. IC Role / Device Role / Timing Role: Output rectifier in flyback or forward converter; conducts continuously during each switching cycle. Use Value: Low IR (≤1 µA) prevents standby power drain; AEC-Q101 qualification ensures field reliability over 15-year vehicle life.	Use Scenario: Secondary-side rectification in constant-current LED drivers for commercial lighting. IC Role / Device Role / Timing Role: Unidirectional current path delivering regulated DC to LED string; operates at 60–100 kHz. Use Value: Thin SMA footprint saves board area in slim-profile luminaires; halogen-free construction meets RoHS and IEC 62474 requirements.

Automotive DC/DC Converter Output Rectification

Industrial Snubber Network

Use Scenario: Rectifying switched output in 12 V → 5 V/3.3 V buck converters within ADAS camera modules.

IC Role / Device Role / Timing Role: Freewheeling diode providing current path during high-side MOSFET off-time; operates at ~200–500 kHz.

Use Value: 0.96 V V_F minimizes conduction loss; 150 °C T_J rating sustains operation near heat-generating image sensors.

Use Scenario: Suppressing voltage spikes across IGBTs in motor drive inverters for HVAC blowers.

IC Role / Device Role / Timing Role: Snubber diode clamping inductive kickback; absorbs energy during turn-off transitions.

Use Value: 30 A I_FSM handles repetitive transients; 400 V V_RRM exceeds bus voltage margin for 24 V systems.

On-Board Charger (OBC) Auxiliary Supply

LED Driver Flyback Secondary

Use Scenario: Providing isolated auxiliary bias supply for gate drivers and controllers in EV on-board chargers.

IC Role / Device Role / Timing Role: Output rectifier in flyback or forward converter; conducts continuously during each switching cycle.

Use Value: Low IR (≤1 µA) prevents standby power drain; AEC-Q101 qualification ensures field reliability over 15-year vehicle life.

Use Scenario: Secondary-side rectification in constant-current LED drivers for commercial lighting.

IC Role / Device Role / Timing Role: Unidirectional current path delivering regulated DC to LED string; operates at 60–100 kHz.

Use Value: Thin SMA footprint saves board area in slim-profile luminaires; halogen-free construction meets RoHS and IEC 62474 requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semi MUR140	V_RRM = 400 V, I_F = 1 A, but faster recovery (t_rr ≈ 50 ns vs. S1GALH's ~500 ns); higher V_F (1.3 V typ @ 1 A).	Better suited for high-frequency PFC stages; less optimal for low-loss DC/DC outputs where conduction loss dominates.	Select MUR140 when switching >200 kHz and recovery speed is critical; choose S1GALH for cost-sensitive, thermally constrained 100–500 kHz designs.
Vishay VS-1EWH04-M3	V_RRM = 400 V, I_F = 1 A, same Thin SMA package, but not AEC-Q101 qualified; slightly higher V_F (0.99 V max @ 1 A).	Limited to industrial/commercial use; lacks automotive qualification documentation and stress test history.	Acceptable for non-automotive applications with identical footprint; avoid where AEC-Q101 traceability or automotive PPAP is required.

Compared with MUR140 and VS-1EWH04-M3, the S1GALH delivers superior thermal robustness (R_θJA = 82 °C/W), automotive-grade reliability via AEC-Q101, and lowest conduction loss in its class-making it the preferred choice for thermally dense, safety-critical automotive power rails.

Availability

S1GALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial snubber networks, and LED driver flyback secondaries requiring stable component supply, long-lifecycle assurance, and AEC-Q101-compliant sourcing.

Supply support for S1GALH 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 high-reliability rectifiers, TVS diodes, and power MOSFETs for automotive and industrial markets.

The S1GALH belongs to TSC's AEC-Q101-qualified Thin SMA rectifier family, engineered specifically for space-constrained, thermally demanding automotive power conversion and protection functions where long-term parametric stability is mandatory.

FAQ

What is the maximum junction temperature rating for S1GALH?

The S1GALH has a maximum junction temperature (T_J) of +150 °C, verified per absolute maximum ratings table in the official TSC datasheet revision B2103. This rating allows uninterrupted operation in under-hood automotive environments and high-ambient industrial enclosures. Derating begins above 75 °C ambient when mounted on a standard 5 mm × 5 mm copper pad, per thermal curves in the S1GALH datasheet.

Is S1GALH pin-compatible with other devices in the S1xALH series?

Yes, all S1xALH devices-including S1DALH, S1GALH, S1JALH, S1KALH, and S1MALH-share identical Thin SMA package dimensions, pinout, and solder pad layout. The only difference is V_RRM rating (200 V to 1000 V), so S1GALH can be substituted within the same footprint when 400 V blocking is sufficient and thermal design accommodates identical power dissipation.

Does S1GALH meet automotive qualification standards?

Yes, the S1GALH is explicitly qualified to AEC-Q101 Rev D for stress testing including HTGB, HTRB, TCT, and mechanical shock. This qualification is documented in TSC's product change notice and certified test reports referenced in datasheet section "Features". It is approved for use in automotive powertrain, chassis, and body electronics where reliability over 15 years is required.

What is the forward voltage of S1GALH at 1 A and 125 °C?

Per the electrical specifications table in the S1GALH datasheet, the forward voltage is 0.85 V (typical) and 0.98 V (maximum) at I_F = 1.0 A and T_J = 125 °C. This reduced V_F versus room temperature reflects positive temperature coefficient behavior typical of silicon rectifiers and supports stable thermal performance in high-temperature operation.

How is polarity marked on the S1GALH package?

The S1GALH uses a cathode band marking on the body of the Thin SMA package to indicate the cathode terminal. This band aligns with the cathode lead (shorter lead in through-hole variants; designated side in SMT orientation). Polarity is further confirmed by the device marking code "S1GAH" printed adjacent to the band, as shown in the "Marking Diagram" section of the official TSC datasheet.

S1GALH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-221AC, SMA Flat Leads

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 1 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 µA @ 400 V

Capacitance @ Vr, F:: 8pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: Thin SMA

Operating Temperature - Junction:: -55°C ~ 150°C

S1GALH FAQ

1.How can I place an order for S1GALH through Aetrix?

Please submit a Request for Quotation (RFQ) for S1GALH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for S1GALH reliable?

The price and inventory of S1GALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1GALH is usually 5 days.

3.What payment methods are accepted for S1GALH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1GALH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S1GALH?

S1GALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S1GALH order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for S1GALH?

For technical support, including S1GALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1GALH requirements.

6.How does Aetrix verify that S1GALH is sourced from the original manufacturer or authorized distributors?

All S1GALH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that S1GALH meets industry standards.

7.What is the process for return or replacement of S1GALH?

All S1GALH units undergo pre-shipment inspection (PSI). If there is an issue with S1GALH, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The S1GALH part is unused and in its original packaging.

Return procedure for S1GALH:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…