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Taiwan Semiconductor Corporation SS315ALH
- Part No.:
- SS315ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SS315ALH.pdf
- Description:
- 3A, 150V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:8,531
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Product details
Overview
SS315ALH from Taiwan Semiconductor is a 3A, 150V Schottky barrier surface-mount rectifier in Thin SMA package, featuring low forward voltage (0.82 V at 3.0A/25°C), 69 pF junction capacitance, and AEC-Q101 qualification for automotive-grade reliability. It delivers high efficiency in DC/DC conversion stages with 70 A surge capability and operates up to +150°C junction temperature.
For engineers reviewing the SS315ALH datasheet, SS315ALH pinout, SS315ALH application, or SS315ALH equivalent, key selection criteria include reverse voltage margin (150 V RRM), thermal resistance (19 °C/W junction-to-lead), low VF at elevated temperature (0.68 V at 3.0A/125°C), and moisture sensitivity level 1 compliance for automated assembly.
Technical Context
The SS315ALH uses a single-die Schottky structure optimized for fast switching and minimal conduction loss in high-frequency power supplies. Its 150 V repetitive peak reverse voltage and 1 mA reverse leakage at 125°C support stable operation in automotive on-board converters where thermal stress and voltage transients are common.
Thermal performance is defined by RθJL = 19 °C/W and RθJA = 81 °C/W on a 5 mm × 5 mm Cu pad, enabling reliable 3 A continuous current handling without forced cooling. The device's 69 pF junction capacitance at 1 MHz / 4 V reduces switching noise in SMPS flyback and buck topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 150 V - Withstands transient spikes up to 150 V in automotive 12 V/24 V systems without breakdown |
| IF | 3 A continuous - Supports full-load operation in compact 15–30 W DC/DC modules |
| VF @ 3.0A, 25°C | 0.82 V max - Minimizes conduction loss and self-heating in high-duty-cycle applications |
| IR @ 150 V, 125°C | 1 mA max - Ensures low standby power loss in thermally demanding environments |
| CJ @ 1 MHz, 4 V | 69 pF - Limits capacitive coupling and EMI generation during hard switching |
| RθJL | 19 °C/W - Enables direct PCB heat transfer to copper pour, reducing need for heatsinking |
| TJ max | +150 °C - Qualified for under-hood automotive use and industrial ambient conditions |
Pinout & Package
Package: Thin SMA (Surface Mount Assembly), JEDEC DO-214AC compliant; matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.028 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current terminal | Connected to source-side of switching node; must be routed with low-inductance trace for EMI control |
| Cathode | Output current terminal | Connected to output rail or ground return; cathode band marks this terminal for automated optical inspection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and HAST |
| Low VF at high temperature | 0.68 V at 3.0A/125°C - Maintains efficiency in hot engine compartments without derating |
| Moisture sensitivity level 1 | No bake required before reflow - compatible with standard SMT lines without dry-pack handling |
| High IFSM | 70 A (8.3 ms) - Survives inrush and load-dump events in vehicle power systems |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance for global OEMs |
Applications
| Automotive On-Board DC/DC Converter | Industrial LED Driver Power Stage |
|---|---|
Use Scenario: Step-down conversion from 24 V battery to 5 V/3.3 V for infotainment ECUs and ADAS sensors. IC Role / Device Role / Timing Role: Output rectifier in synchronous or asynchronous buck converter. Use Value: 150 V VRRM provides 2× margin over 24 V nominal with load dump tolerance; 0.68 V VF at 125°C sustains efficiency across under-hood thermal cycling. |
Use Scenario: Secondary-side rectification in constant-current LED drivers for street lighting and signage. IC Role / Device Role / Timing Role: Freewheeling diode in flyback or buck-boost topology. Use Value: 69 pF CJ minimizes switching noise coupled into analog current-sense paths; AEC-Q101 ensures long-term reliability in outdoor deployments. |
| USB-C PD Adapter Secondary Rectifier | Telecom DC Power Module |
Use Scenario: High-efficiency secondary-side rectification in 60 W USB-C power adapters operating at >100 kHz. IC Role / Device Role / Timing Role: Fast-recovery rectifier replacing conventional PN diodes to reduce losses. Use Value: 0.82 V VF at 3 A/25°C lowers conduction loss vs. silicon alternatives; Thin SMA footprint enables dense PCB layouts. |
Use Scenario: Input rectification and hold-up in -48 V telecom power shelves feeding distributed DC loads. IC Role / Device Role / Timing Role: AC/DC front-end or DC/DC isolation boundary rectifier. Use Value: 70 A IFSM handles telecom surge standards (IEC 61000-4-5); RθJL = 19 °C/W allows thermal coupling to chassis ground plane. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-3EWH01-M3/5AT | 100 V VRRM, 3 A, VF = 0.52 V @ 3 A/25°C, SMA package | Limited to ≤100 V systems; lower VF improves light-load efficiency but insufficient for 150 V automotive transients | Select when VRRM margin < 120 V is acceptable and lowest conduction loss at room temperature is prioritized |
| ON Semiconductor SB3150-TB | 150 V VRRM, 3 A, VF = 0.89 V @ 3 A/25°C, SMA package, no AEC-Q101 | Same voltage rating but higher VF increases thermal load; not qualified for automotive use | Use in cost-sensitive industrial or consumer power supplies where AEC-Q101 is not mandated |
Compared with VS-3EWH01-M3/5AT and SB3150-TB, the SS315ALH uniquely balances 150 V robustness, AEC-Q101 qualification, and mid-range VF (0.82 V) - making it optimal for automotive and industrial DC/DC where reliability and transient margin outweigh ultra-low VF trade-offs.
Availability
SS315ALH is available at Aetrix Electronics and suitable for automotive on-board converters, industrial LED drivers, and telecom DC power modules requiring stable component supply, extended temperature operation, and AEC-Q101 compliance.
Supply support for SS315ALH 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 SS315ALH belongs to TSC's AEC-Q101-qualified Thin SMA Schottky rectifier family, engineered for high-reliability power conversion in automotive and industrial environments where thermal stability and surge resilience are critical.
FAQ
What is the maximum junction temperature rating for SS315ALH?
The SS315ALH has a maximum junction temperature (TJ) of +150°C, verified per AEC-Q101 stress testing. This rating allows sustained operation in under-hood automotive locations and high-ambient industrial enclosures. Derating curves in the SS315ALH datasheet show usable current drops linearly above 100°C ambient, with full 3 A rated up to ~70°C on a standard 5 mm × 5 mm Cu pad.
Is SS315ALH pin-compatible with other parts in the SS3xALH series?
Yes, all SS3xALH devices-including SS34ALH, SS36ALH, SS310ALH, SS315ALH, and SS320ALH-share identical Thin SMA package dimensions, lead pitch, and cathode-band polarity marking. Mechanical compatibility enables drop-in voltage-scaling substitutions on existing PCBs, provided layout thermal relief and voltage margin requirements are re-verified for each variant.
Does SS315ALH require special handling for moisture sensitivity?
No. The SS315ALH is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and placed directly into reflow without baking. This eliminates dry-pack requirements and simplifies SMT line integration versus MS L2+ components.
What is the reverse leakage current of SS315ALH at elevated temperature?
At rated 150 V reverse voltage and +125°C junction temperature, the SS315ALH exhibits a maximum reverse leakage current (IR) of 1 mA. This value is confirmed in the electrical specifications table and supports low standby power in always-on automotive modules where leakage directly impacts battery drain.
How does the forward voltage of SS315ALH compare at 25°C versus 125°C?
The SS315ALH forward voltage decreases with rising temperature: typical VF is 0.76 V at 1.5 A/25°C and 0.62 V at 1.5 A/125°C; at 3.0 A, it is 0.82 V (25°C) and 0.68 V (125°C). This negative temperature coefficient helps stabilize current sharing in parallel configurations and reduces thermal runaway risk.
SS315ALH 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):
- 150 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 950 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 150 V
- Capacitance @ Vr, F:
- 54pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
SS315ALH FAQ
1.How can I place an order for SS315ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS315ALH 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 SS315ALH reliable?
The price and inventory of SS315ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS315ALH is usually 5 days.
3.What payment methods are accepted for SS315ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS315ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS315ALH?
SS315ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS315ALH 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 SS315ALH?
For technical support, including SS315ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS315ALH requirements.
6.How does Aetrix verify that SS315ALH is sourced from the original manufacturer or authorized distributors?
All SS315ALH 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 SS315ALH meets industry standards.
7.What is the process for return or replacement of SS315ALH?
All SS315ALH units undergo pre-shipment inspection (PSI). If there is an issue with SS315ALH, 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 SS315ALH part is unused and in its original packaging.
Return procedure for SS315ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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