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Taiwan Semiconductor Corporation SS12LH
- Part No.:
- SS12LH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
SS12LH.pdf
- Description:
- 1A, 20V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:7,988
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Product details
Overview
SS12LH from Taiwan Semiconductor is a 1 A, 20 V Schottky barrier surface-mount rectifier in Sub SMA package, featuring 0.45 V forward voltage at 1.0 A and 25 °C, 30 A peak surge current, and AEC-Q101 qualification for automotive use in reverse battery protection and DC/DC converters.
For engineers reviewing the SS12LH datasheet, SS12LH pinout, SS12LH application, or SS12LH equivalent, key selection criteria include its 20 V repetitive peak reverse voltage, low 0.385 V typical forward voltage at 0.5 A, junction temperature range of –55 to +125 °C, and Sub SMA mechanical compatibility with automated placement.
Technical Context
The SS12LH operates as a single-die Schottky rectifier with guard ring overvoltage protection and J-STD-020 Level 1 moisture sensitivity. Its 45 °C/W junction-to-lead thermal resistance supports high-current operation in compact layouts.
Designed for high-frequency switching, it delivers low power loss via low forward voltage and exhibits 10,000 V/μs critical dV/dt rating, enabling stable performance in fast-switching DC/DC converters and freewheeling paths where reverse recovery time must be near-zero.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF | 1 A continuous forward current - supports sustained load handling in automotive lighting and converter outputs |
| VRRM | 20 V repetitive peak reverse voltage - defines maximum blocking capability in low-voltage reverse polarity protection circuits |
| VF @ 1.0 A | 0.45 V max at 25 °C - reduces conduction loss and heat generation compared to standard PN diodes |
| IFSM | 30 A non-repetitive surge current - withstands inrush and transient spikes in automotive power rails |
| TJ max | +125 °C maximum junction temperature - enables operation in under-hood environments without derating below rated current |
| RθJL | 45 °C/W junction-to-lead thermal resistance - allows efficient heat transfer to PCB copper in Sub SMA footprint |
Pinout & Package
Package: Sub SMA - surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, cathode band polarity marking, and 0.019 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal | Connected to lower-potential side (e.g., ground or return path) in reverse-battery protection |
| Cathode | Current exit terminal | Marked by band; connects to positive rail input to block reverse current flow |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Guard ring structure | Enhances ruggedness against transient overvoltage events without external snubbers in 12 V systems |
| Moisture sensitivity level 1 | Enables direct placement without baking, reducing manufacturing overhead in SMT lines |
| Low VF at 0.5 A | 0.385 V typical forward voltage minimizes conduction loss in high-duty-cycle DC/DC applications |
Applications
| Reverse Battery Protection | DC/DC Converter Output Rectification |
|---|---|
Use Scenario: Installed between vehicle battery and ECU to prevent damage during jump-start misconnection. IC Role / Device Role / Timing Role: Unidirectional current-blocking rectifier with fast response and no reverse recovery delay. Use Value: 20 V VRRM and 30 A IFSM ensure survival during 24 V double-battery transients while maintaining <0.45 V drop at full load. | Use Scenario: Used on secondary side of isolated buck-derived converters in LED drivers and infotainment supplies. IC Role / Device Role / Timing Role: High-frequency synchronous rectification replacement with zero Qrr and minimal switching loss. Use Value: Sub SMA footprint and 0.385 V VF at 0.5 A reduce board area and thermal load versus TO-220 alternatives. |
| Automotive Interior Lighting | Freewheeling Diode in Solenoid Drivers |
Use Scenario: Protects LED modules in door handles and ambient lighting from reverse polarity during service. IC Role / Device Role / Timing Role: Polarity enforcement diode placed upstream of constant-current LED driver ICs. Use Value: AEC-Q101 qualification and 125 °C TJ max support continuous operation in sealed lamp housings. | Use Scenario: Placed across 12 V solenoid coils in transmission control units to clamp inductive kickback. IC Role / Device Role / Timing Role: Fast-turn-off freewheeling path that suppresses voltage spikes above 20 V. Use Value: 10,000 V/μs dV/dt rating prevents false triggering during rapid coil de-energization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB120-E3/52 | 1 A, 20 V, DO-214AA package; VF = 0.5 V max @ 1 A; RθJA = 120 °C/W | Larger footprint, higher thermal resistance, not AEC-Q101 qualified | Acceptable for industrial DC/DC where automotive qualification is not required |
| SS22HE3_A/H | 2 A, 20 V, SMA package; VF = 0.5 V max @ 2 A; AEC-Q101 qualified | Higher current rating and same qualification, but larger die and higher VF at 1 A | Preferred when future current headroom or dual-source flexibility is needed |
Compared with SB120-E3/52 and SS22HE3_A/H, the SS12LH offers lower forward voltage at 1 A, tighter thermal resistance in Sub SMA, and automotive qualification in a smaller outline-making it optimal for space-constrained, high-reliability 12 V system nodes.
Availability
SS12LH is available at Aetrix Electronics and suitable for reverse battery protection, automotive interior lighting, and DC/DC converter output rectification requiring stable component supply across automotive Tier-1 production programs.
Supply support for SS12LH 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 SS12LH belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for low-loss, high-reliability power conversion and protection in 12 V automotive electrical systems.
FAQ
What is the maximum junction temperature rating for SS12LH?
The SS12LH has a maximum junction temperature (TJ max) of +125 °C, verified per AEC-Q101 stress testing. This rating allows uninterrupted operation in under-hood automotive environments when mounted on adequate copper area. The SS12LH datasheet specifies derating begins above this temperature, and thermal design must maintain junction temperature ≤125 °C under worst-case load and ambient conditions.
Is SS12LH pin-compatible with other parts in the SS1xLH series?
No, SS12LH is not pin-compatible with higher-voltage variants like SS13LH or SS14LH in terms of electrical behavior, though all share the Sub SMA package and two-terminal configuration. Forward voltage, reverse leakage, and thermal performance differ significantly across the series due to die optimization for each VRRM rating, so direct substitution requires validation of circuit-level stress margins.
Does SS12LH require special handling for moisture sensitivity?
No, SS12LH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/60% RH and placed directly onto PCBs without baking or dry-pack requirements. This simplifies SMT line integration and eliminates pre-reflow moisture mitigation steps common with higher-MSL discrete components.
What does the "LH" suffix indicate in SS12LH?
The "LH" suffix in SS12LH denotes Taiwan Semiconductor's standard Sub SMA package variant with matte tin-plated leads, green molding compound, and AEC-Q101 qualification. It distinguishes this automotive-grade version from legacy or industrial-grade equivalents that may share the same voltage/current ratings but lack qualification or material compliance.
Can SS12LH be used in place of a standard PN rectifier in a 12 V automotive circuit?
Yes, SS12LH can replace standard PN rectifiers in 12 V automotive circuits where low forward voltage and zero reverse recovery are critical-such as reverse battery protection and DC/DC output stages. Its 0.45 V VF at 1 A reduces conduction loss by ~40% versus typical 1 A PN diodes, lowering thermal stress and improving efficiency without changing layout or drive logic.
SS12LH 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):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 450 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 400 µA @ 20 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
SS12LH FAQ
1.How can I place an order for SS12LH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS12LH 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 SS12LH reliable?
The price and inventory of SS12LH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS12LH is usually 5 days.
3.What payment methods are accepted for SS12LH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS12LH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS12LH?
SS12LH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS12LH 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 SS12LH?
For technical support, including SS12LH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS12LH requirements.
6.How does Aetrix verify that SS12LH is sourced from the original manufacturer or authorized distributors?
All SS12LH 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 SS12LH meets industry standards.
7.What is the process for return or replacement of SS12LH?
All SS12LH units undergo pre-shipment inspection (PSI). If there is an issue with SS12LH, 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 SS12LH part is unused and in its original packaging.
Return procedure for SS12LH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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