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Taiwan Semiconductor Corporation S1ALH
- Part No.:
- S1ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
S1ALH.pdf
- Description:
- 1A, 50V, STANDARD RECOVERY RECTI
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
S1ALH from Taiwan Semiconductor is a 1A, 50V standard surface-mount silicon rectifier diode in Sub SMA package, featuring glass-passivated junction, AEC-Q101 qualification, and 1.1V max forward voltage at 1A - used in automotive lighting and DC-DC converter input rectification.
For engineers reviewing the S1ALH datasheet, S1ALH pinout, S1ALH application, or S1ALH equivalent, key selection criteria include repetitive peak reverse voltage (50V), surge current rating (30A), thermal resistance (25°C/W junction-to-lead), and AEC-Q101 compliance for under-hood automotive use.
Technical Context
The S1ALH is a single-die, unidirectional standard recovery rectifier optimized for low-profile automated assembly. Its glass-passivated junction ensures stable reverse leakage (<5µA at 25°C) and robustness against moisture (J-STD-020 Level 1).
Thermal performance is defined by two RθJL values: 25°C/W applies to S1ALH–S1JLH variants, supporting high-power-density layouts where lead conduction dominates heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse voltage; sets safe operating limit in 12V automotive systems with transient clamping margin. |
| IF | 1 A continuous - average forward current rating; defines steady-state power handling in low-power DC-DC front-end rectifiers. |
| IFSM | 30 A - non-repetitive surge current (8.3ms half-sine); enables survival during load dump or cold-crank transients. |
| VF (max) | 1.1 V at IF = 1A, TJ = 25°C - directly determines conduction loss (1.1W) and thermal rise in compact layouts. |
| TJ(max) | +175°C - maximum junction temperature; supports operation in engine compartment environments without derating below 125°C ambient. |
| RθJL | 25 °C/W - junction-to-lead thermal resistance; enables accurate PCB copper pour sizing for thermal management via lead-frame conduction. |
Pinout & Package
Package: Sub SMA - low-profile, surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to lower-potential side (e.g., transformer secondary or switch node); requires adequate copper area for thermal conduction. |
| Cathode | Forward current exit / reverse blocking terminal | Marked by visible band; ties to output rail or filter capacitor; must maintain clearance from adjacent high-dV/dt nodes. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per stress test requirements. |
| Glass-passivated junction | Eliminates need for conformal coating in humid environments; maintains IR < 50µA at 125°C for long-term stability. |
| Sub SMA package | 0.019g weight and low height enable placement on dense, double-sided automotive PCBs with minimal Z-axis impact. |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT line logistics. |
Applications
| Automotive Lighting | DC-DC Converter Input Rectification |
|---|---|
Use Scenario: Rectifying 12V alternator output or LED driver supply in headlamp modules. IC Role / Device Role / Timing Role: Standard recovery rectifier providing unidirectional current path with low VF and high surge tolerance. Use Value: 30A IFSM withstands load dump spikes; AEC-Q101 ensures >15-year field life in vibration-prone locations. | Use Scenario: Input-stage AC/DC or flyback rectification in 5–24V industrial DC-DC modules. IC Role / Device Role / Timing Role: Primary-side rectifier converting transformer secondary AC to DC bus with minimal conduction loss. Use Value: 1.1V VF limits power loss to ≤1.1W at 1A; Sub SMA footprint allows high-density layout without thermal vias. |
| Snubber Circuit | General-Purpose Power Supply |
Use Scenario: Clamping voltage spikes across MOSFETs or relays in 12V/24V control circuits. IC Role / Device Role / Timing Role: Fast-recovery-capable standard rectifier absorbing inductive kick energy in RC snubbers. Use Value: 1800ns trr provides sufficient turn-off speed for 10–100kHz switching; 50V VRRM matches typical relay coil ratings. | Use Scenario: Output rectification in wall adapters, battery chargers, and embedded system auxiliary supplies. IC Role / Device Role / Timing Role: General-purpose discrete rectifier delivering reliable, cost-effective DC conversion. Use Value: RoHS/halogen-free compliance meets global regulatory requirements; J-STD-020 Level 1 enables direct use from tape-and-reel without moisture mitigation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor M1AL | Same 1A/50V rating, but rated for 20A IFSM (vs. 30A for S1ALH); RθJA = 75°C/W (vs. 85°C/W). | Limited surge margin in automotive load-dump scenarios; better suited for consumer-grade power supplies. | Select M1AL only when surge immunity is not critical and lower thermal resistance is prioritized. |
| Vishay VS-1A50 | Identical 1A/50V/30A specs; Sub SMA package; but not AEC-Q101 qualified and has higher VF (1.15V max). | Not approved for automotive under-hood use; acceptable for industrial or commercial DC-DC designs. | Choose VS-1A50 for cost-sensitive non-automotive applications where AEC-Q101 is not mandated. |
Compared with M1AL and VS-1A50, the S1ALH uniquely combines AEC-Q101 qualification, 30A surge rating, and 1.1V VF - making it the only option qualified for automotive lighting and engine-control rectification without design compromise.
Availability
S1ALH is available at Aetrix Electronics and suitable for automotive lighting, DC-DC converter input rectification, and snubber circuit applications requiring stable component supply across extended production lifecycles.
Supply support for S1ALH 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 Taiwanese manufacturer specializing in discrete power semiconductors, including rectifiers, TVS diodes, and MOSFETs.
The S1ALH belongs to TSC's S1xLH standard rectifier family, engineered for high-reliability automotive and industrial power conversion where AEC-Q101 compliance, surge robustness, and thermal efficiency are mandatory.
FAQ
What is the maximum junction temperature rating for the S1ALH?
The S1ALH has a maximum junction temperature (TJ(max)) of +175°C, enabling operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. This rating is validated per AEC-Q101 stress testing and allows full 1A current capability up to 125°C ambient when mounted on appropriate copper area. The S1ALH maintains electrical stability throughout this range without parameter drift or reliability degradation.
Is the S1ALH suitable for automotive applications?
Yes, the S1ALH is AEC-Q101 qualified and explicitly designed for automotive use, including lighting modules and engine-control subsystems. Its glass-passivated junction, J-STD-020 Level 1 moisture rating, and 30A surge capability meet stringent automotive reliability requirements. The S1ALH is referenced in TSC's automotive-grade rectifier documentation and carries full qualification test reports for temperature cycling, HTRB, and mechanical shock.
What does the "H" suffix in S1ALH indicate?
Per TSC's ordering nomenclature, the "H" suffix in S1ALH denotes the Sub SMA package variant with matte tin-plated leads and green molding compound. It distinguishes this version from through-hole or alternate surface-mount packages and confirms compliance with J-STD-002 solderability and JESD201 Class 2 whisker resistance. The S1ALH is supplied in 10,000-piece tape-and-reel format.
How does the S1ALH compare to fast recovery rectifiers in snubber circuits?
The S1ALH has a reverse recovery time (trr) of 1800ns - slower than dedicated fast recovery diodes but sufficient for snubbing 10–100kHz switching transients in relay or MOSFET gate drive circuits. Its 50V VRRM and 30A IFSM provide precise voltage clamping without oscillation risk. Unlike ultrafast diodes, the S1ALH avoids EMI concerns while delivering proven reliability in production automotive snubbers.
What is the forward voltage drop of the S1ALH at rated current?
The S1ALH exhibits a maximum forward voltage (VF) of 1.1V at IF = 1A and TJ = 25°C, measured under pulsed conditions (PW = 0.3ms). At elevated junction temperatures (e.g., 125°C), VF decreases slightly due to semiconductor physics, maintaining conduction loss below 1.1W. This value is confirmed in TSC's B2108 datasheet revision and verified across production lots.
S1ALH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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):
- 1.8 µs
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 9pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 175°C
S1ALH FAQ
1.How can I place an order for S1ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for S1ALH 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 S1ALH reliable?
The price and inventory of S1ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1ALH is usually 5 days.
3.What payment methods are accepted for S1ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1ALH?
S1ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1ALH 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 S1ALH?
For technical support, including S1ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1ALH requirements.
6.How does Aetrix verify that S1ALH is sourced from the original manufacturer or authorized distributors?
All S1ALH 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 S1ALH meets industry standards.
7.What is the process for return or replacement of S1ALH?
All S1ALH units undergo pre-shipment inspection (PSI). If there is an issue with S1ALH, 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 S1ALH part is unused and in its original packaging.
Return procedure for S1ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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