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

Taiwan Semiconductor Corporation S2AH

Name: S2AH
Brand: Taiwan Semiconductor Corporation
SKU: S2AH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S2AH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: S2AH.pdf

Description:: DIODE GEN PURP 50V 2A DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:8,419

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Product details

Overview

S2AH from Taiwan Semiconductor is a 2 A, 50 V surface-mount general-purpose rectifier diode in DO-214AA (SMB) package, featuring 1.15 V max forward voltage at 2 A, 50 A surge capability, and AEC-Q101 qualification for automotive-grade reliability in DC-DC converters and freewheeling circuits.

For engineers reviewing the S2AH datasheet, S2AH pinout, S2AH application, or S2AH equivalent, key selection criteria include repetitive peak reverse voltage (50 V), forward current rating (2 A), junction-to-lead thermal resistance (16 °C/W), and AEC-Q101 qualification for under-hood automotive use.

Technical Context

The S2AH is a single-die, glass-passivated silicon rectifier optimized for high-reliability surface-mount applications. Its 50 V V_RRM, 2 A continuous forward current, and 50 A non-repetitive surge rating support robust operation in transient-prone power paths.

Thermally, it delivers R_θJL = 16 °C/W and R_θJA = 53 °C/W, enabling stable performance up to 150 °C junction temperature. Reverse recovery time is 1500 ns at I_F = 0.5 A, I_R = 1.0 A, with I_rr = 0.25 A - suitable for moderate-speed switching and snubber networks.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - maximum repetitive reverse voltage before breakdown; defines safe operating range in DC-DC output rectification
I_F	2 A - continuous average forward current; determines steady-state power handling in freewheeling diodes
I_FSM	50 A - 8.3 ms half-sine surge rating; supports inrush and fault-current resilience in automotive lighting drivers
V_F	≤1.15 V @ 2 A, 25°C - low conduction loss improves efficiency in 12 V system rectifiers
T_J max	+150°C - enables operation in engine bay environments without derating below ambient 105°C
C_J	30 pF @ 1 MHz, 4 V - limits capacitive coupling in high-frequency snubber circuits
t_rr	1500 ns - defines switching speed limit; compatible with ≤100 kHz PWM topologies

Pinout & Package

Package: DO-214AA (SMB), surface-mount, matte tin-plated leads, polarity indicated by cathode band, UL 94V-0 molding compound, weight ≈ 0.090 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); accepts 2 A continuous, 50 A surge
Cathode (K)	Forward current exit / reverse blocking terminal	Connected to higher-potential rail (e.g., output capacitor positive); blocks 50 V reverse bias with ≤1 µA leakage at 25°C

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive temperature cycling, humidity, and mechanical stress - required for under-hood ECU and lighting modules
Glass passivated junction	Enhances moisture resistance and long-term reliability in humid environments without hermetic sealing
Low V_F (≤1.15 V)	Reduces conduction loss by ~15% vs. standard 1N400x diodes at 2 A, improving thermal margin in compact SMB layouts
Junction-to-lead R_θJL = 16 °C/W	Enables direct heat transfer to PCB copper pour, supporting >1.5 W dissipation without heatsink in 2-layer boards
Moisture sensitivity level 1	No baking required prior to reflow - simplifies SMT line integration and reduces manufacturing cost

Applications

DC-DC Converter Output Rectification	Automotive LED Lighting Driver
Use Scenario: Used as output rectifier in 12 V input, 5–24 V output buck converters powering vehicle infotainment displays. IC Role / Device Role / Timing Role: Unidirectional current valve converting switched AC-like node voltage into regulated DC output. Use Value: 50 V V_RRM provides 2× safety margin over 12 V nominal bus; 2 A rating matches typical display backlight current requirements.	Use Scenario: Freewheeling path for inductive current in PWM-driven headlamp LED drivers. IC Role / Device Role / Timing Role: Clamp inductive kickback during MOSFET turn-off to protect switching FET and reduce EMI. Use Value: 50 A I_FSM withstands lamp cold-resistance surges; 1500 ns t_rr avoids cross-conduction in 10–50 kHz PWM dimming.
Snubber Network Diode	Automotive HVAC Blower Motor Freewheeling
Use Scenario: Fast-recovery diode in RCD snubber across flyback transformer primary in 12 V auxiliary power supply. IC Role / Device Role / Timing Role: Provides controlled discharge path for snubber capacitor during MOSFET off-time. Use Value: 30 pF C_J minimizes parasitic capacitance impact on snubber timing; 1.15 V V_F ensures low energy loss per cycle.	Use Scenario: Freewheeling diode across brushed DC blower motor coil in climate control systems. IC Role / Device Role / Timing Role: Provides return path for stored inductive energy when motor driver H-bridge disables. Use Value: AEC-Q101 qualification ensures survival under repeated thermal cycling (-40°C to +125°C ambient); DO-214AA footprint fits tight motor control PCB space.

DC-DC Converter Output Rectification

Automotive LED Lighting Driver

Use Scenario: Used as output rectifier in 12 V input, 5–24 V output buck converters powering vehicle infotainment displays.

IC Role / Device Role / Timing Role: Unidirectional current valve converting switched AC-like node voltage into regulated DC output.

Use Value: 50 V V_RRM provides 2× safety margin over 12 V nominal bus; 2 A rating matches typical display backlight current requirements.

Use Scenario: Freewheeling path for inductive current in PWM-driven headlamp LED drivers.

IC Role / Device Role / Timing Role: Clamp inductive kickback during MOSFET turn-off to protect switching FET and reduce EMI.

Use Value: 50 A I_FSM withstands lamp cold-resistance surges; 1500 ns t_rr avoids cross-conduction in 10–50 kHz PWM dimming.

Snubber Network Diode

Automotive HVAC Blower Motor Freewheeling

Use Scenario: Fast-recovery diode in RCD snubber across flyback transformer primary in 12 V auxiliary power supply.

IC Role / Device Role / Timing Role: Provides controlled discharge path for snubber capacitor during MOSFET off-time.

Use Value: 30 pF C_J minimizes parasitic capacitance impact on snubber timing; 1.15 V V_F ensures low energy loss per cycle.

Use Scenario: Freewheeling diode across brushed DC blower motor coil in climate control systems.

IC Role / Device Role / Timing Role: Provides return path for stored inductive energy when motor driver H-bridge disables.

Use Value: AEC-Q101 qualification ensures survival under repeated thermal cycling (-40°C to +125°C ambient); DO-214AA footprint fits tight motor control PCB space.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR220	200 V V_RRM, 1.3 V V_F max, 75 A I_FSM, same DO-214AA package	Higher voltage rating suits 24/48 V systems; higher V_F increases conduction loss in 12 V designs	Select when >50 V reverse margin needed; not drop-in for S2AH's 50 V rating
Vishay VS-2EYH01-M3	100 V V_RRM, 1.1 V V_F max, 50 A I_FSM, AEC-Q101 qualified, same package	Higher V_RRM allows use in dual-battery (24 V) vehicles; identical thermal and surge specs	Preferred for 24 V automotive platforms requiring same footprint and qualification

Compared with MUR220 and VS-2EYH01-M3, the S2AH offers optimal voltage matching (50 V) and lowest V_F among AEC-Q101 SMB rectifiers for 12 V automotive subsystems - reducing heat generation where board space and airflow are constrained.

Availability

S2AH is available at Aetrix Electronics and suitable for automotive LED lighting, DC-DC converter output rectification, and snubber network design requiring stable component supply and AEC-Q101 compliance.

Supply support for S2AH 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 devices, rectifiers, and protection components.

The S2AH belongs to TSC's AEC-Q101-qualified S2xH rectifier family, engineered specifically for automotive power conversion and inductive load control where reliability, thermal robustness, and surface-mount compatibility are critical.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) of the S2AH?

The S2AH has a V_RRM of 50 V, meaning it can reliably block up to 50 V of reverse voltage in repetitive operation. This rating is confirmed in the Absolute Maximum Ratings table of the official TSC datasheet (Version A2102). Exceeding this voltage risks avalanche breakdown and permanent damage. The S2AH is therefore suited for 12 V automotive systems with appropriate safety margins but not for 24 V or higher nominal rails without derating.

Is the S2AH qualified for automotive applications?

Yes, the S2AH is explicitly AEC-Q101 qualified per its datasheet, confirming compliance with stress tests for temperature cycling, humidity, mechanical shock, and solderability required for automotive under-hood and cabin electronics. This qualification applies directly to the S2AH variant - not just the broader S2xH family - and supports use in lighting, HVAC, and body control modules where reliability is mandated.

What is the forward voltage drop (V_F) of the S2AH at rated current?

The S2AH exhibits a maximum forward voltage drop of 1.15 V at 2 A forward current and 25°C junction temperature, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating. At higher temperatures or continuous DC, V_F decreases slightly due to negative temperature coefficient, but design should conservatively use 1.15 V for worst-case power loss calculation in the S2AH.

Does the S2AH have a defined reverse recovery time (t_rr)?

Yes, the S2AH has a typical reverse recovery time of 1500 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter is documented in the Electrical Specifications section and confirms the S2AH is a standard recovery (not ultrafast) rectifier - appropriate for switching frequencies up to ~100 kHz but not recommended for MHz-range SMPS topologies where faster t_rr is required.

What package does the S2AH use, and is it RoHS compliant?

The S2AH uses the DO-214AA (SMB) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity marking. It is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the Features section of the TSC datasheet. Moisture sensitivity level is rated at Level 1 (J-STD-020), eliminating bake requirements before reflow soldering.

S2AH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 1.15 V @ 2 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:: 30pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMB)

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

S2AH FAQ

1.How can I place an order for S2AH through Aetrix?

Please submit a Request for Quotation (RFQ) for S2AH 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 S2AH reliable?

The price and inventory of S2AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2AH is usually 5 days.

3.What payment methods are accepted for S2AH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2AH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S2AH?

S2AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S2AH 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 S2AH?

For technical support, including S2AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2AH requirements.

6.How does Aetrix verify that S2AH is sourced from the original manufacturer or authorized distributors?

All S2AH 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 S2AH meets industry standards.

7.What is the process for return or replacement of S2AH?

All S2AH units undergo pre-shipment inspection (PSI). If there is an issue with S2AH, 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 S2AH part is unused and in its original packaging.

Return procedure for S2AH:

1.Submit a request within 90 days.

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

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