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Taiwan Semiconductor Corporation SS14ALH
- Part No.:
- SS14ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SS14ALH.pdf
- Description:
- 1A, 40V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:6,810
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Product details
Overview
SS14ALH from Taiwan Semiconductor is a 1A, 40V Schottky barrier surface-mount rectifier in Thin SMA package, featuring low forward voltage (0.44 V at 1.0 A, 25°C), high surge capability (30 A IFSM), AEC-Q101 qualification, and junction temperature rating up to +150°C. It serves as a primary output rectifier in compact DC/DC converters and AC/DC adapters.
For engineers reviewing the SS14ALH datasheet, SS14ALH pinout, SS14ALH application, or SS14ALH equivalent, key selection criteria include forward voltage at operating current and temperature, reverse leakage at 125°C, thermal resistance (RθJL = 24°C/W), and AEC-Q101 compliance for automotive-grade power conversion designs.
Technical Context
The SS14ALH implements a single-die Schottky junction optimized for low conduction loss in high-frequency switching topologies. Its 40 V VRRM, 1 A continuous forward current, and 30 A non-repetitive surge rating support robust operation in flyback and buck-derived secondary-side rectification.
Thermal performance is defined by RθJL = 24°C/W and RθJA = 78°C/W on a 5 mm × 5 mm Cu pad, enabling reliable power dissipation in space-constrained layouts. The device uses matte tin-plated leads compliant with J-STD-002 and meets JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage; sets upper limit for output capacitor voltage rating in SMPS designs |
| IF | 1 A - Continuous forward current rating; defines maximum steady-state load current without derating |
| VF @ 1.0 A, 25°C | 0.44 V (max) - Directly determines conduction loss (0.44 W at 1 A), critical for efficiency in low-voltage outputs |
| IFSM (8.3 ms) | 30 A - Peak surge withstand capability; supports startup inrush and transient overload conditions |
| TJ max | +150°C - Enables operation in high-ambient environments such as under-hood automotive modules |
| RθJL | 24°C/W - Junction-to-lead thermal resistance; informs heatsinking strategy when mounted on PCB copper |
| IR @ 40 V, 125°C | 40 mA - Reverse leakage at elevated temperature; impacts standby power in always-on systems |
Pinout & Package
Package: Thin SMA (Surface Mount Assembly), molded in UL 94V-0 compound, cathode indicated by band, weight ≈ 0.028 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction | Connected to transformer secondary or switch node; must handle peak forward current and thermal stress |
| Cathode | Output terminal for forward conduction | Connected to output filter capacitor and load; polarity marking ensures correct PCB placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power electronics per stress test requirements (HTOL, TC, HAST, etc.) |
| Low VF at 125°C | 0.37 V (max) - Maintains efficiency during thermal transients in enclosed enclosures |
| Junction capacitance (CJ) | 69 pF @ 1 MHz, 4 V - Minimizes switching loss and EMI in >100 kHz converters |
| Moisture sensitivity level | MSL Level 1 - No bake required before reflow; simplifies SMT manufacturing flow |
| Halogen-free construction | Complies with IEC 61249-2-21 - Meets environmental compliance for RoHS and green procurement programs |
Applications
| SMPS Output Rectification | Automotive DC/DC Converters |
|---|---|
Use Scenario: Secondary-side rectification in 12 V → 5 V/3.3 V isolated flyback or forward converters. IC Role / Device Role / Timing Role: Unidirectional power switch converting high-frequency AC from transformer to regulated DC output. Use Value: Low VF reduces conduction loss by ~30% vs. standard PN diodes, improving full-load efficiency above 85%. | Use Scenario: On-board 48 V → 12 V or 12 V → 5 V DC/DC conversion in ADAS ECUs and infotainment modules. IC Role / Device Role / Timing Role: High-reliability rectifier in thermally demanding under-dash environments. Use Value: AEC-Q101 qualification and +150°C TJ rating ensure functional safety compliance without derating. |
| USB-C Power Adapters | LED Driver Secondary Side |
Use Scenario: Synchronous rectification replacement in compact 30–65 W GaN-based USB-C PD adapters. IC Role / Device Role / Timing Role: Fast-recovery, low-loss output diode enabling high-density, fanless adapter designs. Use Value: Thin SMA footprint and MSL Level 1 enable automated placement and reflow without moisture concerns. | Use Scenario: Constant-current output rectification in isolated LED drivers for street lighting and commercial fixtures. IC Role / Device Role / Timing Role: High-surge-capable rectifier handling lamp ignition transients and line surges. Use Value: 30 A IFSM withstands 10× rated current pulses during cold-start LED string turn-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS14-E3/5AT (Vishay) | VRRM = 40 V, IF = 1 A, VF = 0.55 V (max) @ 1 A, 25°C; RθJA = 110°C/W | Higher VF and worse thermal resistance reduce efficiency in high-power-density designs | Preferred where cost is prioritized over thermal performance and automotive qualification is not required |
| SB140 (ON Semiconductor) | VRRM = 40 V, IF = 1 A, VF = 0.52 V (max) @ 1 A, 25°C; not AEC-Q101 qualified | Lacks automotive qualification and has higher leakage at 125°C (50 mA vs. 40 mA) | Suitable for industrial adapters but not for automotive-grade reliability-critical systems |
Compared with SS14-E3/5AT and SB140, the SS14ALH delivers lower conduction loss, superior thermal performance, and AEC-Q101 validation-making it the preferred choice for automotive and high-efficiency SMPS where junction temperature control and long-term reliability are design-critical.
Availability
SS14ALH is available at Aetrix Electronics and suitable for switching mode power supplies, automotive DC/DC converters, and LED lighting applications requiring stable component supply and consistent AEC-Q101-compliant sourcing.
Supply support for SS14ALH 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 semiconductor manufacturer specializing in discrete power devices, including Schottky rectifiers, MOSFETs, and TVS diodes, with global distribution and automotive qualification capabilities.
The SS14ALH belongs to TSC's ALH-series Schottky rectifier product line, engineered for high-efficiency, surface-mount power conversion in automotive, industrial, and consumer power supplies where low VF, thermal robustness, and AEC-Q101 compliance are essential.
FAQ
What is the maximum junction temperature rating for SS14ALH?
The SS14ALH has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings in the official datasheet. This allows the SS14ALH to operate reliably in high-ambient environments such as automotive engine compartments or enclosed LED driver housings without thermal shutdown. Derating begins above 125°C ambient depending on PCB copper area and airflow.
Is SS14ALH AEC-Q101 qualified?
Yes, the SS14ALH is explicitly AEC-Q101 qualified as stated in the "FEATURES" section of the Taiwan Semiconductor datasheet (Version B2103). This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing-confirming suitability for automotive power electronics applications where reliability is mission-critical.
What is the forward voltage of SS14ALH at 1.0 A and 125°C?
The SS14ALH exhibits a maximum forward voltage of 0.46 V at 1.0 A and 125°C, per the Electrical Specifications table. At typical operating conditions (1.0 A, 125°C), the typical VF is 0.37 V. This low, temperature-stable VF directly reduces conduction losses in thermally stressed systems, making the SS14ALH especially valuable in high-temperature DC/DC converter designs.
What package type does SS14ALH use, and is it lead-free?
The SS14ALH uses the Thin SMA surface-mount package with matte tin-plated leads, fully compliant with J-STD-002 solderability standards. It is RoHS-compliant and halogen-free per IEC 61249-2-21. The package weighs approximately 0.028 g and features a cathode band for polarity identification-critical for automated optical inspection and placement accuracy in high-volume SMT lines.
What is the reverse leakage current of SS14ALH at 40 V and 125°C?
The SS14ALH has a maximum reverse leakage current (IR) of 40 mA at rated VR = 40 V and junction temperature of 125°C, as specified in the Electrical Specifications table. This value is measured using a 30 ms pulse test. At 25°C, leakage is limited to 100 µA-enabling low standby power in always-on systems such as USB-C PD controllers and smart lighting platforms.
SS14ALH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 40 V
- Capacitance @ Vr, F:
- 69pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
SS14ALH FAQ
1.How can I place an order for SS14ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS14ALH 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 SS14ALH reliable?
The price and inventory of SS14ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS14ALH is usually 5 days.
3.What payment methods are accepted for SS14ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS14ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS14ALH?
SS14ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS14ALH 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 SS14ALH?
For technical support, including SS14ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS14ALH requirements.
6.How does Aetrix verify that SS14ALH is sourced from the original manufacturer or authorized distributors?
All SS14ALH 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 SS14ALH meets industry standards.
7.What is the process for return or replacement of SS14ALH?
All SS14ALH units undergo pre-shipment inspection (PSI). If there is an issue with SS14ALH, 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 SS14ALH part is unused and in its original packaging.
Return procedure for SS14ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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