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

Taiwan Semiconductor Corporation S1AH

Name: S1AH
Brand: Taiwan Semiconductor Corporation
SKU: S1AH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S1AH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: S1AH.pdf

Description:: DIODE GEN PURP 50V 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:5,529

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Product details

Overview

S1AH from Taiwan Semiconductor is a 1A, 50V surface-mount silicon rectifier diode in DO-214AC (SMA) package, featuring AEC-Q101 qualification, glass passivated junction, 1.1V max forward voltage at 1A/25°C, and 1µA max reverse leakage at 25°C - used in automotive lighting and DC-DC converter input stages.

For engineers reviewing the S1AH datasheet, S1AH pinout, S1AH application, or S1AH equivalent, key selection criteria include repetitive peak reverse voltage (50V), surge current rating (40A), thermal resistance (R_θJL = 27°C/W), junction temperature range (–55°C to +175°C), and RoHS/halogen-free compliance for automotive-grade reliability.

Technical Context

The S1AH is a single-die, standard recovery rectifier with non-repetitive avalanche energy rating of 5mJ (IAS = 1A, L = 10mH) and reverse recovery time of 1500ns under IF = 0.5A / IR = 1.0A / Irr = 0.25A conditions. Its DO-214AC (SMA) package supports automated placement and meets JESD201 Class 2 whisker resistance.

Thermal performance is characterized by junction-to-lead resistance of 27°C/W and junction-to-ambient resistance of 75°C/W at TA = 25°C. The device operates across –55°C to +175°C storage and junction temperature ranges, with cathode polarity indicated by a band on the molded case.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - maximum repetitive reverse blocking voltage; defines minimum system isolation margin in 12V/24V automotive circuits
I_F	1 A continuous - average forward current rating; sets thermal derating limit for PCB trace design and heatsinking
V_F (max)	1.1 V @ 1A, 25°C - forward conduction loss directly impacts efficiency in low-voltage DC-DC front-end rectification
I_R (max)	1 µA @ 25°C - low leakage ensures minimal standby power loss in battery-coupled systems like LED drivers
t_rr	1500 ns - standard recovery speed; suitable for <100kHz switching topologies but not high-frequency SMPS
R_θJL	27 °C/W - enables direct lead-to-PCB heat transfer; critical for thermal management without external heatsinks
T_J max	+175°C - extended junction temperature supports under-hood automotive environments without derating

Pinout & Package

DO-214AC (SMA) surface-mount package with axial leads formed into gull-wing configuration; cathode indicated by molded band; matte tin-plated terminals compliant with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., ground or return path) in rectifier configuration
Cathode	Forward current exit point	Marked by band; connects to positive output rail or switch node in flyback/snubber applications

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics per stress test requirements - enables use in engine control, lighting, and body modules
Glass passivated junction	Enhanced moisture and contamination resistance - improves long-term reliability in humid or chemically aggressive under-hood environments
Moisture sensitivity level 1	No floor life limitation before reflow - eliminates baking requirement and simplifies SMT line handling
UL 94V-0 molding compound	Self-extinguishing encapsulation - satisfies flammability safety requirements for automotive interior and power modules
JESD201 Class 2 whisker resistance	Prevents tin whisker growth under thermal cycling - mitigates risk of latent short circuits in 15+ year automotive service life

Applications

Automotive LED Lighting	DC-DC Converter Input Rectification
Use Scenario: Reverse polarity protection and AC/DC rectification in 12V/24V vehicle headlamp and DRL driver modules. IC Role / Device Role / Timing Role: Standard recovery rectifier providing unidirectional current flow and transient suppression via snubber integration. Use Value: 50V V_RRM matches nominal system voltage with margin; 175°C T_J max ensures operation near hot LED heatsinks.	Use Scenario: Input-stage rectification in isolated flyback or forward converters powering infotainment and ADAS subsystems. IC Role / Device Role / Timing Role: Primary-side rectifier converting transformer secondary AC to DC; handles 40A surge during cold-start load dump events. Use Value: 40A I_FSM withstands 8.3ms half-sine surges; R_θJL = 27°C/W allows direct PCB copper cooling without thermal vias.
Snubber Network Diode	General-Purpose Power Rectification
Use Scenario: Clamp diode in RCD snubber circuits across MOSFETs in automotive power supplies and motor drivers. IC Role / Device Role / Timing Role: Fast turn-off clamp element absorbing inductive kickback energy during switching transitions. Use Value: 5mJ E_RSM rating absorbs defined avalanche energy; 1500ns t_rr avoids oscillation in sub-100kHz snubbers.	Use Scenario: Low-cost, robust rectification in industrial control power supplies, HVAC fan drivers, and appliance auxiliary rails. IC Role / Device Role / Timing Role: General-purpose discrete rectifier replacing legacy DO-41 parts where surface-mount assembly and AEC-Q101 are required. Use Value: DO-214AC footprint enables drop-in replacement; halogen-free and RoHS compliance meets global manufacturing mandates.

Automotive LED Lighting

DC-DC Converter Input Rectification

Use Scenario: Reverse polarity protection and AC/DC rectification in 12V/24V vehicle headlamp and DRL driver modules.

IC Role / Device Role / Timing Role: Standard recovery rectifier providing unidirectional current flow and transient suppression via snubber integration.

Use Value: 50V V_RRM matches nominal system voltage with margin; 175°C T_J max ensures operation near hot LED heatsinks.

Use Scenario: Input-stage rectification in isolated flyback or forward converters powering infotainment and ADAS subsystems.

IC Role / Device Role / Timing Role: Primary-side rectifier converting transformer secondary AC to DC; handles 40A surge during cold-start load dump events.

Use Value: 40A I_FSM withstands 8.3ms half-sine surges; R_θJL = 27°C/W allows direct PCB copper cooling without thermal vias.

Snubber Network Diode

General-Purpose Power Rectification

Use Scenario: Clamp diode in RCD snubber circuits across MOSFETs in automotive power supplies and motor drivers.

IC Role / Device Role / Timing Role: Fast turn-off clamp element absorbing inductive kickback energy during switching transitions.

Use Value: 5mJ E_RSM rating absorbs defined avalanche energy; 1500ns t_rr avoids oscillation in sub-100kHz snubbers.

Use Scenario: Low-cost, robust rectification in industrial control power supplies, HVAC fan drivers, and appliance auxiliary rails.

IC Role / Device Role / Timing Role: General-purpose discrete rectifier replacing legacy DO-41 parts where surface-mount assembly and AEC-Q101 are required.

Use Value: DO-214AC footprint enables drop-in replacement; halogen-free and RoHS compliance meets global manufacturing mandates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR105	50V V_RRM, 1A I_F, 50ns t_rr, TO-220AC package	Ultrafast recovery; requires through-hole mounting and heatsink	Preferred where high-frequency switching (>100kHz) or higher surge tolerance (50A) is needed
Vishay VS-1A50	50V V_RRM, 1A I_F, 1.15V V_F, DO-214AC, no AEC-Q101	Same package and basic specs; lacks automotive qualification and JESD201 whisker testing	Acceptable for industrial/commercial use where automotive reliability is not mandated

Compared with MUR105 and VS-1A50, the S1AH uniquely combines AEC-Q101 qualification, DO-214AC SMT compatibility, and 175°C junction rating - making it the only option among the three validated for under-hood automotive deployment without layout or thermal redesign.

Availability

S1AH is available at Aetrix Electronics and suitable for automotive LED lighting, DC-DC converter input rectification, and snubber network applications requiring stable component supply, long-lifecycle support, and automotive-grade traceability.

Supply support for S1AH 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, serving automotive, industrial, and consumer markets since 1979.

The S1AH belongs to TSC's AEC-Q101-qualified SMA rectifier family designed specifically for cost-sensitive, thermally demanding automotive power conversion and protection functions - emphasizing reliability, manufacturability, and regulatory compliance.

FAQ

What is the maximum junction temperature rating for the S1AH?

The S1AH has a maximum junction temperature (T_J) of +175°C, verified per absolute maximum ratings in the official datasheet. This rating enables reliable operation in high-temperature automotive environments such as under-hood lighting modules and engine bay power supplies. The S1AH maintains full electrical specifications up to this limit when thermal design respects R_θJL = 27°C/W and proper PCB copper area is provided.

Is the S1AH pin-compatible with other devices in the S1xH series?

Yes - all S1xH devices including S1AH, S1BH, and S1MH share identical DO-214AC (SMA) package dimensions, pinout, and terminal configuration. The only difference is rated V_RRM (50V to 1000V); thus, S1AH can be substituted with higher-voltage variants if board layout and thermal constraints allow, but not vice versa without voltage margin verification.

Does the S1AH meet automotive qualification standards?

Yes, the S1AH is explicitly AEC-Q101 qualified per the manufacturer's documentation, covering stress tests for temperature cycling, humidity bias, high-temperature operating life, and mechanical shock. This qualification confirms suitability for automotive electronic control units, lighting systems, and powertrain-related modules where long-term reliability under vibration and thermal cycling is mandatory.

What is the forward voltage drop of the S1AH at rated current?

The S1AH exhibits a maximum forward voltage (V_F) of 1.1 V at I_F = 1 A and T_J = 25°C, as specified in the electrical characteristics table. At elevated temperatures (e.g., 125°C), V_F decreases slightly due to semiconductor physics, but system-level thermal design must ensure the S1AH stays within its 175°C T_J limit to maintain this performance.

Can the S1AH be used in snubber circuits?

Yes, the S1AH is specified for snubber applications with a non-repetitive avalanche energy rating (E_RSM) of 5 mJ at I_AS = 1 A and L = 10 mH. Its 1500 ns reverse recovery time and 50 V V_RRM make it suitable for clamp diodes in RCD snubbers operating below 100 kHz. The S1AH's glass passivation and AEC-Q101 qualification further enhance robustness in repetitive transient environments.

S1AH 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):: 50 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 @ 50 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

S1AH FAQ

1.How can I place an order for S1AH through Aetrix?

Please submit a Request for Quotation (RFQ) for S1AH 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 S1AH reliable?

The price and inventory of S1AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1AH is usually 5 days.

3.What payment methods are accepted for S1AH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1AH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S1AH?

S1AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S1AH 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 S1AH?

For technical support, including S1AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1AH requirements.

6.How does Aetrix verify that S1AH is sourced from the original manufacturer or authorized distributors?

All S1AH 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 S1AH meets industry standards.

7.What is the process for return or replacement of S1AH?

All S1AH units undergo pre-shipment inspection (PSI). If there is an issue with S1AH, 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 S1AH part is unused and in its original packaging.

Return procedure for S1AH:

1.Submit a request within 90 days.

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

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