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

Taiwan Semiconductor Corporation S1MH

Name: S1MH
Brand: Taiwan Semiconductor Corporation
SKU: S1MH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S1MH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: S1MH.pdf

Description:: DIODE GEN PURP 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:6,696

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Product details

Overview

S1MH from Taiwan Semiconductor is a surface-mount silicon rectifier diode rated for 1000 V repetitive peak reverse voltage (V_RRM), 1 A average forward current (I_F), and 40 A non-repetitive peak forward surge current (I_FSM); it features low forward voltage drop (1.1 V at 1 A, 25°C), glass passivated junction, and DO-214AC (SMA) package - used in automotive snubber circuits and DC-DC converters.

For engineers reviewing the S1MH datasheet, S1MH pinout, S1MH application, or S1MH equivalent, key selection considerations include its 1000 V V_RRM, AEC-Q101 qualification, 175°C maximum junction temperature, thermal resistance (R_θJA = 85°C/W), and DO-214AC mechanical compatibility with automated placement.

Technical Context

The S1MH is a single-die, standard recovery rectifier with 1500 ns reverse recovery time (t_rr) under defined test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A). Its junction capacitance is 12 pF at 1 MHz and 4.0 V reverse bias.

Thermally, it exhibits R_θJL = 30°C/W and R_θJA = 85°C/W - higher than lower-voltage variants (e.g., S1AH–S1JH) due to structural differences in die construction and thermal path design for high-voltage operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1000 V - supports primary-side rectification in offline SMPS and high-voltage snubbers without derating
I_F	1 A continuous - suitable for low-to-medium power DC-DC stages and auxiliary supplies
I_FSM	40 A (8.3 ms half-sine) - withstands inrush and transient surges in automotive lighting and ignition circuits
V_F	1.1 V max @ 1 A, 25°C - limits conduction loss and self-heating in thermally constrained layouts
t_rr	1500 ns - defines switching speed limitation; appropriate for line-frequency and low-frequency (<100 kHz) applications
T_J max	175°C - enables operation in under-hood automotive environments with minimal thermal margin loss
C_J	12 pF @ 1 MHz, 4 V - impacts high-frequency noise coupling and EMI filter design in snubber networks

Pinout & Package

Package: DO-214AC (SMA), surface-mount, molded epoxy case meeting UL 94V-0; cathode indicated by band; matte tin-plated leads compliant with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal	Connected to lower-potential side of AC source or switch node in snubber/clamp
Cathode	Current exit terminal	Connected to output rail or clamp capacitor; polarity band marks this terminal

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and UHAST - required for under-hood and lighting modules
Glass passivated junction	Enhances moisture resistance and long-term stability of reverse leakage (I_R ≤ 1 µA @ 25°C)
Low forward voltage	1.1 V max reduces power dissipation vs. legacy 1N4007 (1.3 V), improving efficiency in 12 V/24 V systems
Moisture sensitivity level 1	No floor life limitation or bake requirement before reflow - simplifies SMT manufacturing flow
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS Directive - supports green electronics compliance programs

Applications

Automotive LED Headlamp Driver	Industrial AC-DC Auxiliary Supply
Use Scenario: Rectifying 12–24 V AC from transformer secondary in constant-current LED driver for headlamps. IC Role / Device Role / Timing Role: Output rectifier in flyback or forward converter stage, handling 1 A load with 1000 V isolation margin. Use Value: AEC-Q101 qualification and 175°C T_J max ensure reliability in sealed, thermally isolated lamp housings.	Use Scenario: Providing isolated +15 V bias supply for gate drivers in motor control inverters. IC Role / Device Role / Timing Role: Secondary-side rectifier in low-power auxiliary flyback, operating at line frequency with minimal ripple. Use Value: 1000 V V_RRM allows safe operation across wide input transients (e.g., 600 VAC surge), reducing need for additional clamping.
Snubber Network in Ignition Coil Driver	DC-DC Converter Input Stage (24 V Input)
Use Scenario: Clamping voltage spikes across MOSFET drain during turn-off in inductive ignition coil switching. IC Role / Device Role / Timing Role: Fast-acting clamp diode in RCD snubber, absorbing energy from L_leak × di/dt. Use Value: 40 A I_FSM and 5 mJ E_RSM enable robust absorption of repetitive 10–20 A spike currents without degradation.	Use Scenario: Input rectification of 24 VAC from industrial control transformer feeding buck-derived 5 V logic supply. IC Role / Device Role / Timing Role: Full-wave bridge leg component (in discrete bridge configuration), conducting 1 A RMS at 50/60 Hz. Use Value: Low V_F (1.1 V) minimizes heat generation in confined DIN-rail mounted enclosures with limited airflow.

Automotive LED Headlamp Driver

Industrial AC-DC Auxiliary Supply

Use Scenario: Rectifying 12–24 V AC from transformer secondary in constant-current LED driver for headlamps.

IC Role / Device Role / Timing Role: Output rectifier in flyback or forward converter stage, handling 1 A load with 1000 V isolation margin.

Use Value: AEC-Q101 qualification and 175°C T_J max ensure reliability in sealed, thermally isolated lamp housings.

Use Scenario: Providing isolated +15 V bias supply for gate drivers in motor control inverters.

IC Role / Device Role / Timing Role: Secondary-side rectifier in low-power auxiliary flyback, operating at line frequency with minimal ripple.

Use Value: 1000 V V_RRM allows safe operation across wide input transients (e.g., 600 VAC surge), reducing need for additional clamping.

Snubber Network in Ignition Coil Driver

DC-DC Converter Input Stage (24 V Input)

Use Scenario: Clamping voltage spikes across MOSFET drain during turn-off in inductive ignition coil switching.

IC Role / Device Role / Timing Role: Fast-acting clamp diode in RCD snubber, absorbing energy from L_leak × di/dt.

Use Value: 40 A I_FSM and 5 mJ E_RSM enable robust absorption of repetitive 10–20 A spike currents without degradation.

Use Scenario: Input rectification of 24 VAC from industrial control transformer feeding buck-derived 5 V logic supply.

IC Role / Device Role / Timing Role: Full-wave bridge leg component (in discrete bridge configuration), conducting 1 A RMS at 50/60 Hz.

Use Value: Low V_F (1.1 V) minimizes heat generation in confined DIN-rail mounted enclosures with limited airflow.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06	600 V V_RRM, 1 A I_F, 150 ns t_rr, TO-220AC package	Higher-speed recovery but lower voltage rating; requires heatsink mounting	Select when faster switching and higher thermal mass are needed, not for direct 1000 V replacement
ON Semi MUR1100	1000 V V_RRM, 1 A I_F, 75 ns t_rr, DO-41 package	Ultrafast recovery but axial leaded; no AEC-Q101 qualification; higher V_F (1.3 V)	Use only in non-automotive, non-SMT designs where fast recovery outweighs packaging and qualification constraints

Compared with STTH1R06 and MUR1100, the S1MH uniquely combines 1000 V rating, AEC-Q101 qualification, surface-mount DO-214AC packaging, and automotive-grade thermal capability - making it the only option among the three qualified for under-hood SMT rectification without layout or qualification compromise.

Availability

S1MH is available at Aetrix Electronics and suitable for automotive lighting, DC-DC converter auxiliary supplies, and snubber networks requiring stable component supply across production lifecycles.

Supply support for S1MH 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 automotive markets.

The S1MH belongs to TSC's AEC-Q101-qualified S1xH rectifier family, designed specifically for high-reliability, surface-mount rectification in automotive power systems and industrial power supplies where voltage margin and thermal resilience are critical.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1MH?

The S1MH has a maximum repetitive peak reverse voltage (V_RRM) of 1000 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version A2102). This rating applies at T_A = 25°C and defines the highest reverse voltage the S1MH can block continuously without breakdown. Derating is required above 25°C ambient per the Forward Current Derating Curve.

Is the S1MH suitable for automotive applications?

Yes, the S1MH is AEC-Q101 qualified, explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. It meets stress tests including temperature cycling, high-temperature reverse bias (HTRB), and unbiased highly accelerated stress test (UHAST), making it suitable for under-hood automotive applications such as LED headlamp drivers and ignition coil snubbers where reliability at 175°C junction temperature is required.

What package type does the S1MH use, and is it compatible with automated assembly?

The S1MH uses the DO-214AC (SMA) surface-mount package, with matte tin-plated leads compliant with J-STD-002 solderability standards. The datasheet states it is "ideal for automated placement," and its moisture sensitivity level (MSL) is Level 1 - meaning no floor life limitation or pre-bake is required before reflow soldering, supporting high-yield SMT production.

What is the forward voltage (V_F) of the S1MH at rated current?

The forward voltage (V_F) of the S1MH is specified as a maximum of 1.1 V at I_F = 1 A and T_J = 25°C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to minimize self-heating. At higher junction temperatures or continuous DC operation, V_F decreases slightly due to negative temperature coefficient of silicon diodes.

Does the S1MH have a defined reverse recovery time (t_rr)?

Yes, the S1MH has a typical reverse recovery time (t_rr) of 1500 ns, measured under the conditions I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, as documented in the Electrical Specifications table. This confirms it is a standard recovery (not ultrafast or fast recovery) rectifier, appropriate for line-frequency and low-switching-frequency applications like snubbers and auxiliary supplies.

S1MH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1000 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):: 1.5 µs

Current - Reverse Leakage @ Vr:: 1 µA @ 1000 V

Capacitance @ Vr, F:: 12pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

Operating Temperature - Junction:: -55°C ~ 175°C

S1MH FAQ

1.How can I place an order for S1MH through Aetrix?

Please submit a Request for Quotation (RFQ) for S1MH 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 S1MH reliable?

The price and inventory of S1MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1MH is usually 5 days.

3.What payment methods are accepted for S1MH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1MH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S1MH?

S1MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S1MH 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 S1MH?

For technical support, including S1MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1MH requirements.

6.How does Aetrix verify that S1MH is sourced from the original manufacturer or authorized distributors?

All S1MH 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 S1MH meets industry standards.

7.What is the process for return or replacement of S1MH?

All S1MH units undergo pre-shipment inspection (PSI). If there is an issue with S1MH, 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 S1MH part is unused and in its original packaging.

Return procedure for S1MH:

1.Submit a request within 90 days.

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

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