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Taiwan Semiconductor Corporation SS14LH
- Part No.:
- SS14LH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
SS14LH.pdf
- Description:
- 1A, 40V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:8,594
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Product details
Overview
SS14LH from Taiwan Semiconductor is a 1A, 40V Schottky barrier surface-mount rectifier in Sub SMA package, featuring 0.510V forward voltage at 0.5A/25°C, 30A peak surge current, and AEC-Q101 qualification for automotive-grade reliability. It serves as a freewheeling or reverse-battery protection diode in DC/DC converters and car lighting systems.
For engineers reviewing the SS14LH datasheet, SS14LH pinout, SS14LH application, or SS14LH equivalent, key selection criteria include its 40V VRRM, low VF at high temperature, moisture sensitivity level 1 rating, and Sub SMA thermal performance (RθJL = 45°C/W).
Technical Context
The SS14LH is a single-die Schottky rectifier optimized for low-loss operation in high-frequency switching applications. Its guard ring structure provides overvoltage protection, and it supports automated placement with matte tin-plated leads compliant to J-STD-002.
Rated for junction temperatures up to +125°C (with storage to +150°C), it delivers 400µA max reverse leakage at 25°C and 6mA at 100°C under rated reverse voltage - critical for thermal-stable power rail clamping and flyback recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 12–24V automotive and industrial DC/DC topologies. |
| IF | 1 A continuous - Rated average forward current; supports sustained conduction in compact power stages without forced cooling. |
| VF @ 0.5A, 25°C | 0.510 V - Low conduction loss enabling >92% efficiency in 5–12V buck converters at light-to-moderate loads. |
| IFSM | 30 A - Peak non-repetitive surge capability; handles inrush and transient overloads in battery-connected circuits. |
| RθJL | 45 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pour heat sinking without heatsink requirement. |
| TJ max | +125 °C - Maximum operating junction temperature; validated for under-hood automotive environments per AEC-Q101. |
| MSL | Level 1 - No floor life limitation; allows indefinite dry pack storage and standard reflow without baking. |
Pinout & Package
Package: Sub SMA - Surface-mount plastic package with cathode band marking, UL 94V-0 molding compound, and matte tin-plated leads. Dimensions conform to JEDEC DO-214AC outline with 2.7mm x 4.2mm body and 2.3mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to lower-potential node (e.g., switch node in synchronous buck); requires low-inductance trace routing. |
| Cathode | Forward current exit / reverse voltage reference | Marked by band; ties to output rail or ground return path; must maintain clean reference for reverse leakage control. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and ESD - suitable for engine control, lighting, and ADAS subsystems. |
| Guard ring structure | Enhances ruggedness against transient overvoltage events (e.g., load dump) without external TVS, reducing BOM count in 12V battery interfaces. |
| Low VF at elevated TJ | 0.550 V @ 1.0A/25°C and stable VF slope up to 125°C - maintains efficiency during thermal transients in enclosed enclosures. |
| High dV/dt immunity | 10,000 V/µs - suppresses false turn-on in fast-switching SMPS layouts, minimizing shoot-through risk in half-bridge freewheel paths. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance for global OEM production programs. |
Applications
| DC/DC Converter Output Rectification | Reverse Battery Protection |
|---|---|
Use Scenario: Used on the secondary side of isolated or non-isolated buck converters supplying 3.3V–12V rails to microcontrollers and sensors. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during high-side switch off-time. Use Value: 0.510V VF minimizes conduction loss, improving converter efficiency by ~1.8% vs. standard PN diodes at 0.5A load. | Use Scenario: Placed in series with vehicle battery input to prevent damage from accidental reverse polarity connection. IC Role / Device Role / Timing Role: Unidirectional current gate blocking reverse current flow while passing forward current with minimal drop. Use Value: 40V VRRM and 30A IFSM withstand jump-start surges and clamp reverse voltage without latch-up. |
| Automotive LED Lighting Driver | Freewheeling Diode in Relay/Actuator Circuits |
Use Scenario: Integrated into constant-current LED driver modules for headlamps and DRLs in 12V/24V platforms. IC Role / Device Role / Timing Role: Output rectifier and voltage clamp during PWM dimming transitions. Use Value: AEC-Q101 qualification and +125°C TJ rating ensure reliability in thermally constrained headlamp housings. | Use Scenario: Parallel to relay coil or solenoid to absorb inductive kickback energy during de-energization. IC Role / Device Role / Timing Role: Energy recirculation path preventing voltage spikes >100V across driver ICs. Use Value: 10,000 V/µs dV/dt rating ensures stable operation during rapid coil discharge without oscillation or failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS14 (DO-214AC) | Same VRRM (40V), IF (1A), but not AEC-Q101 qualified; RθJL = 50°C/W vs. 45°C/W. | Lacks automotive qualification; unsuitable for under-hood or safety-critical modules. | Select SS14LH when AEC-Q101 compliance and tighter thermal resistance are required. |
| SB140 (DO-41) | Through-hole package; identical electrical specs but higher RθJA (120°C/W); no MSL Level 1 rating. | Not compatible with SMT assembly lines; limited to prototyping or legacy through-hole designs. | Choose SS14LH for automated manufacturing, moisture-insensitive handling, and superior thermal performance in dense layouts. |
Compared with SS14 and SB140, the SS14LH offers verified automotive qualification, lower thermal resistance, and surface-mount compatibility - making it the preferred choice for volume production of automotive and industrial power supplies where reliability, manufacturability, and thermal margin are prioritized.
Availability
SS14LH is available at Aetrix Electronics and suitable for DC/DC converters, reverse battery protection circuits, and automotive LED lighting systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SS14LH 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 rectifiers, TVS devices, and automotive-qualified components.
The SS14LH belongs to TSC's AEC-Q101-qualified Sub SMA Schottky rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in automotive and industrial environments.
FAQ
What is the maximum junction temperature rating for SS14LH?
The SS14LH has a maximum junction temperature (TJ) rating of +125°C, validated per AEC-Q101 stress testing. This rating applies under continuous forward conduction at rated current and ambient conditions defined in the thermal derating curve. The SS14LH datasheet confirms this limit is maintained across its full voltage range (20–150V variants), and the device remains functional up to +150°C storage temperature. Always verify PCB copper area and airflow to sustain this rating in actual SS14LH deployments.
Is SS14LH pin-compatible with SS14 in the same Sub SMA package?
Yes, SS14LH and SS14 share identical Sub SMA mechanical dimensions, anode/cathode terminal layout, and polarity marking (cathode band). Both comply with DO-214AC footprint standards. However, SS14LH adds AEC-Q101 qualification, tighter thermal resistance (45°C/W vs. 50°C/W), and enhanced process controls - meaning SS14LH can directly replace SS14 in automotive designs, but SS14 lacks the qualification required for SS14LH's target applications.
What is the reverse leakage current specification for SS14LH at 100°C?
At TJ = 100°C and rated VR = 40V, the SS14LH exhibits a maximum reverse leakage current (IR) of 6 mA, as specified in the Electrical Specifications table. This value is confirmed for all SS12LH–SS14LH variants. At 25°C, leakage is ≤400 µA. These values are measured using a 30ms pulse per Note 2 in the datasheet and reflect real-world behavior in thermally demanding DC/DC and lighting applications.
Does SS14LH require special handling due to moisture sensitivity?
No - the SS14LH is rated Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has unlimited floor life and does not require dry pack storage or baking prior to reflow. Its Sub SMA package uses moisture-resistant molding compound, and the matte tin-plated leads meet J-STD-002 solderability requirements. This simplifies inventory management and eliminates reflow yield risks associated with MSL 3+ components like many QFN or BGA ICs.
Can SS14LH be used in place of SS16LH for 60V applications?
No - the SS14LH is rated for 40V VRRM, while SS16LH is rated for 60V. Using SS14LH in a 60V circuit risks reverse breakdown, catastrophic failure, and system instability. The "x" in SS1xLH explicitly denotes voltage grade: "4" = 40V, "6" = 60V. Always match the SS14LH to 40V or lower reverse voltage applications; for 60V systems, SS16LH or higher-voltage variants must be selected to ensure design margin and long-term reliability.
SS14LH 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:
- 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:
- 400 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 125°C
SS14LH FAQ
1.How can I place an order for SS14LH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS14LH 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 SS14LH reliable?
The price and inventory of SS14LH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS14LH is usually 5 days.
3.What payment methods are accepted for SS14LH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS14LH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS14LH?
SS14LH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS14LH 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 SS14LH?
For technical support, including SS14LH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS14LH requirements.
6.How does Aetrix verify that SS14LH is sourced from the original manufacturer or authorized distributors?
All SS14LH 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 SS14LH meets industry standards.
7.What is the process for return or replacement of SS14LH?
All SS14LH units undergo pre-shipment inspection (PSI). If there is an issue with SS14LH, 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 SS14LH part is unused and in its original packaging.
Return procedure for SS14LH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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