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Taiwan Semiconductor Corporation S4AH
- Part No.:
- S4AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
S4AH.pdf
- Description:
- 4A, 50V, STANDARD RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:8,480
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Product details
Overview
S4AH from Taiwan Semiconductor is a 4A, 50V surface-mount silicon rectifier diode in DO-214AB (SMC) package, featuring AEC-Q101 qualification, 100A peak surge current capability, 1.15V max forward voltage at 4A, and 10µA max reverse leakage at 25°C - used in automotive DC-DC converters and snubber circuits.
For engineers reviewing the S4AH datasheet, S4AH pinout, S4AH application, or S4AH equivalent, key selection criteria include repetitive peak reverse voltage (50V), junction-to-lead thermal resistance (13°C/W), glass-passivated junction, moisture sensitivity level 1, and RoHS/halogen-free compliance per IEC 61249-2-21.
Technical Context
The S4AH is a single-die, standard recovery rectifier with 1500ns reverse recovery time under IF = 0.5A / IR = 1.0A / Irr = 0.25A conditions and 60pF junction capacitance at 1MHz and 4V reverse bias. Its glass-passivated chip junction ensures stable operation in harsh environments.
Designed for surface-mount automated assembly, the S4AH supports continuous forward current up to 4A at 150°C junction temperature and withstands 100A non-repetitive surge current (8.3ms half-sine). Polarity is indicated by cathode band on the DO-214AB molded case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse voltage before breakdown; defines safe operating range in DC-DC input stages |
| IF | 4 A - continuous average forward current rating at TA = 25°C; determines steady-state power handling |
| IFSM | 100 A - peak non-repetitive surge current (8.3ms); enables robustness against transient overloads |
| VF (max) | 1.15 V @ 4A, 25°C - limits conduction loss and self-heating in high-current rectification paths |
| IR (max) | 10 µA @ 50V, 25°C - low leakage preserves efficiency in high-impedance hold-up or sensing circuits |
| trr | 1500 ns - standard recovery speed suitable for <100kHz switching; not optimized for high-frequency SMPS |
| RθJL | 13 °C/W - enables direct thermal coupling to PCB copper; critical for thermal management without heatsinks |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity marked by cathode band, weight ≈ 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of AC source or switch node; must handle full 4A continuous current |
| Cathode | Forward current exit point | Connected to output rail or energy storage; marked by visible band; carries same current as anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass-passivated junction | Prevents moisture ingress and surface contamination, enabling stable long-term performance in humid environments |
| Moisture sensitivity level 1 | No baking required prior to reflow; compatible with standard J-STD-020 profile and automated SMT lines |
| RoHS & halogen-free | Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21; supports green manufacturing requirements |
| UL 94V-0 molding compound | Self-extinguishing encapsulant meets safety standards for industrial and automotive end equipment |
Applications
| Automotive DC-DC Converters | Car Lighting Systems |
|---|---|
Use Scenario: Step-down conversion in 12V–48V bidirectional converters for ADAS power domains. IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck topology. Use Value: Low VF (≤1.15V) reduces conduction loss; AEC-Q101 qualification ensures operation across -40°C to +150°C ambient. | Use Scenario: LED driver front-end rectification in headlamp modules with PWM dimming. IC Role / Device Role / Timing Role: Input AC/DC rectifier feeding constant-current LED controller ICs. Use Value: 100A IFSM withstands inrush during cold start; glass passivation prevents corrosion in sealed lamp housings. |
| Snubber Networks | Industrial Power Supplies |
Use Scenario: RCD snubber across MOSFETs in flyback or forward converters operating at ≤100kHz. IC Role / Device Role / Timing Role: Clamp diode that conducts transient energy into RC network during switch turn-off. Use Value: 1500ns trr aligns with typical snubber timing; 50V VRRM suffices for clamp voltages below 40V. | Use Scenario: Auxiliary supply rectification in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Primary-side rectifier converting transformer secondary AC to DC for control circuitry. Use Value: DO-214AB footprint allows high-density layout; RθJL = 13°C/W enables natural convection cooling without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH4L06S | 600V VRRM, 4A IF, 1.7V VF (max), 50ns trr - faster but higher VF and voltage rating | Better suited for 400–600V PFC or boost stages; over-spec'd for 50V S4AH use cases | Select only if system requires >100V reverse blocking or <100ns recovery; not drop-in for S4AH footprint |
| ON Semi MUR420 | 200V VRRM, 4A IF, 1.25V VF (max), 75ns trr - ultrafast, higher VF, same package | Preferred in high-frequency SMPS where fast recovery minimizes switching loss | Compatible DO-214AB footprint but higher VF increases conduction loss; verify thermal margin at 4A |
Compared with STTH4L06S and MUR420, the S4AH offers optimal balance of low VF (1.15V), 50V rating, and AEC-Q101 qualification - making it uniquely suited for cost-sensitive, thermally constrained 12V automotive auxiliary rails where ultrafast recovery is unnecessary.
Availability
S4AH is available at Aetrix Electronics and suitable for automotive DC-DC converters, car lighting systems, and snubber networks requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for S4AH 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 S4AH belongs to TSC's AEC-Q101-qualified S4xH rectifier family, engineered specifically for surface-mount automotive power conversion where reliability, thermal efficiency, and process compatibility are prioritized over ultrafast switching.
FAQ
What is the maximum junction temperature rating for the S4AH?
The S4AH has a maximum junction temperature (TJ MAX) of +150°C, verified per absolute maximum ratings in the official TSC datasheet revision A2102. This rating applies under continuous forward current conditions and supports operation in under-hood automotive environments. Derating curves confirm usable current capacity down to 0A at 150°C ambient when mounted on standard FR-4 PCB. The S4AH must not exceed this limit to maintain reliability and AEC-Q101 qualification integrity.
Is the S4AH pin-compatible with other devices in the S4xH series?
No - while all S4xH devices share the DO-214AB (SMC) package and anode/cathode terminal configuration, the S4AH is not pin-compatible with higher-voltage variants like S4MH in functional circuits due to differing VRRM (50V vs. 1000V) and associated safe operating area constraints. The S4AH marking code "S4A" is unique to its 50V rating; substituting other S4xH parts requires full electrical validation. The S4AH itself maintains consistent pinout across all production lots.
Does the S4AH require pre-baking before reflow soldering?
No - the S4AH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and placed directly into standard lead-free reflow profiles without baking. This eliminates moisture-related popcorning risk and simplifies SMT line integration. The S4AH's DO-214AB molding compound and glass-passivated die structure contribute to this robust moisture resistance, confirmed in TSC's qualification report A2102.
What is the reverse recovery time (trr) specification for the S4AH?
The S4AH has a reverse recovery time (trr) of 1500 ns, measured under IF = 0.5A, IR = 1.0A, and Irr = 0.25A per the TSC datasheet. This value reflects standard recovery behavior suitable for line-frequency and low-to-mid frequency (<100 kHz) applications such as snubbers and automotive auxiliary supplies. It is not characterized for high-frequency SMPS use. The S4AH's trr is consistent across production lots and validated during AEC-Q101 stress testing.
How does the S4AH's forward voltage compare to similar 4A rectifiers?
The S4AH specifies a maximum forward voltage (VF) of 1.15 V at 4A and 25°C - lower than many competing 4A rectifiers such as the MUR420 (1.25 V) and significantly lower than ultrafast types like STTH4L06S (1.7 V). This lower VF reduces conduction losses and self-heating in high-duty-cycle applications. The S4AH achieves this via optimized silicon doping and glass passivation, as documented in TSC's A2102 datasheet electrical specifications table.
S4AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 4A
- Voltage - Forward (Vf) (Max) @ If:
- 1.15 V @ 4 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 1.5 µs
- Current - Reverse Leakage @ Vr:
- 10 µA @ 50 V
- Capacitance @ Vr, F:
- 60pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
- Operating Temperature - Junction:
- -55°C ~ 150°C
S4AH FAQ
1.How can I place an order for S4AH through Aetrix?
Please submit a Request for Quotation (RFQ) for S4AH 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 S4AH reliable?
The price and inventory of S4AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S4AH is usually 5 days.
3.What payment methods are accepted for S4AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S4AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S4AH?
S4AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S4AH 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 S4AH?
For technical support, including S4AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S4AH requirements.
6.How does Aetrix verify that S4AH is sourced from the original manufacturer or authorized distributors?
All S4AH 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 S4AH meets industry standards.
7.What is the process for return or replacement of S4AH?
All S4AH units undergo pre-shipment inspection (PSI). If there is an issue with S4AH, 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 S4AH part is unused and in its original packaging.
Return procedure for S4AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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