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Taiwan Semiconductor Corporation SS29LH
- Part No.:
- SS29LH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
SS29LH.pdf
- Description:
- 2A, 90V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:3,218
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Product details
Overview
SS29LH from Taiwan Semiconductor is a 2 A, 90 V Schottky barrier surface-mount rectifier in Sub SMA package, featuring 0.85 V forward voltage at 2 A and 100 µA reverse leakage at rated VR and 25°C, designed for high-frequency DC/DC converters and freewheeling applications in automotive lighting and power supplies.
For engineers reviewing the SS29LH datasheet, SS29LH pinout, SS29LH application, or SS29LH equivalent, key selection criteria include its AEC-Q101 qualification, 50 A surge rating, 17 °C/W junction-to-lead thermal resistance, and low VF–IR trade-off optimized for efficiency-critical 90 V-class Schottky rectification.
Technical Context
The SS29LH implements a single-die Schottky junction with guard ring overvoltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its 90 V repetitive peak reverse voltage (VRRM) and 63 V RMS reverse voltage define its use in mid-voltage DC bus clamping and flyback snubbing.
Thermally, it delivers 17 °C/W junction-to-lead resistance and operates up to +150°C junction temperature, enabling sustained 2 A conduction in compact layouts where lead-frame conduction dominates heat dissipation over ambient convection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - supports DC bus voltages up to 63 V RMS in switching power supplies |
| IF | 2 A continuous - rated for steady-state output rectification in 12–48 V DC/DC stages |
| VF @ 2 A, 25°C | 0.85 V - reduces conduction loss to ~1.7 W per device at full load |
| IR @ 90 V, 25°C | 100 µA - minimizes standby leakage in reverse-battery protection circuits |
| IFSM | 50 A - withstands inrush and transient surges in automotive load-dump conditions |
| TJ max | +150°C - enables operation in under-hood automotive environments without derating |
| RθJL | 17 °C/W - allows direct PCB copper pour thermal coupling to improve power density |
Pinout & Package
Package: Sub SMA - surface-mount, single-anode/single-cathode configuration with cathode band polarity marking; moisture sensitivity level 1 (J-STD-020), UL 94V-0 molding compound, 0.019 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node (e.g., switch node in buck converter) |
| Cathode | Current exit point during forward conduction; marked by band | Connected to output rail or ground return path; defines polarity-sensitive placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Guard ring structure | Enhances ruggedness against transient overvoltage events without external TVS |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking preconditioning |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU requirements |
| Junction-to-lead thermal resistance | 17 °C/W - prioritizes heat transfer through PCB copper rather than air convection |
Applications
| Automotive LED Headlamp Driver | Industrial DC/DC Buck Converter |
|---|---|
Use Scenario: High-efficiency rectification in constant-current LED driver stage with 48 V input and PWM dimming. IC Role / Device Role / Timing Role: Freewheeling diode across buck inductor, conducting during low-side switch off-time. Use Value: 0.85 V VF minimizes power loss at 2 A peak current, extending thermal margin in sealed headlamp housings. | Use Scenario: Output rectification in isolated 24 V to 5 V flyback converter powering PLC I/O modules. IC Role / Device Role / Timing Role: Secondary-side synchronous rectification replacement, operating in discontinuous conduction mode. Use Value: 90 V VRRM safely clamps reflected flyback spikes; 100 µA IR ensures low standby consumption. |
| Reverse Battery Protection Circuit | Low-Voltage Inverter Auxiliary Supply |
Use Scenario: Polarity protection between vehicle battery and 12 V infotainment system main board. IC Role / Device Role / Timing Role: Series-connected anode-in configuration blocking reverse current during accidental battery reversal. Use Value: AEC-Q101 qualification guarantees survivability across -40°C to +125°C ambient; 50 A IFSM handles jump-start transients. | Use Scenario: Auxiliary 12 V supply rectification in 3-phase motor drive inverters with regenerative braking. IC Role / Device Role / Timing Role: Freewheeling path for inductive energy recovery during IGBT turn-off. Use Value: 17 °C/W RθJL enables direct thermal coupling to heatsinked PCB layers, sustaining 2 A average current during burst-mode operation. |
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-2EY90-M3/57T | Same Sub SMA package, 2 A/90 V, VF = 0.82 V @ 2 A, IR = 120 µA @ 90 V | Slightly higher IR may increase standby loss in always-on systems | Preferred where marginally lower VF justifies tighter IR tolerance |
| ON Semiconductor SB290 | DO-214AA package (SMA), 2 A/90 V, VF = 0.87 V @ 2 A, IR = 100 µA @ 90 V, non-AEC-Q101 | Lacks automotive qualification; larger footprint increases layout area | Acceptable for industrial DC/DC where AEC-Q101 is not mandated |
Compared with VS-2EY90-M3/57T and SB290, the SS29LH offers AEC-Q101 compliance in Sub SMA with balanced VF–IR performance and superior thermal resistance-making it optimal for space-constrained, thermally demanding automotive power stages requiring long-term reliability validation.
Availability
SS29LH is available at Aetrix Electronics and suitable for automotive LED lighting, industrial DC/DC converters, reverse battery protection, and low-voltage inverter auxiliary supplies requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SS29LH 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 MOSFETs for automotive and industrial markets.
The SS29LH belongs to TSC's SSxLH Schottky rectifier family, engineered specifically for AEC-Q101-compliant, high-efficiency mid-voltage rectification in space-constrained automotive and industrial power conversion systems.
FAQ
What is the maximum junction temperature rating for the SS29LH?
The SS29LH has a maximum junction temperature (TJ max) of +150°C, validated per AEC-Q101 stress testing. This rating allows uninterrupted 2 A operation in high-ambient environments such as automotive engine compartments when mounted on adequately sized copper pours. The SS29LH datasheet specifies derating curves beginning at +125°C ambient, and thermal design must account for its 17 °C/W junction-to-lead resistance to avoid exceeding +150°C under worst-case load.
Is the SS29LH pin-compatible with other SSxLH series devices?
Yes, all SSxLH devices-including SS29LH-share identical Sub SMA package dimensions, pinout (anode/cathode), and mounting footprint. Voltage variants (e.g., SS25LH, SS210LH) differ only in VRRM and VF/IR trade-offs; mechanical integration remains consistent across the family. No PCB redesign is needed when substituting within the SSxLH series, provided thermal and electrical margins are verified for the specific voltage/current requirements of the SS29LH.
Does the SS29LH meet automotive reliability standards?
Yes, the SS29LH is explicitly qualified to AEC-Q101 Rev D for discrete semiconductors, covering stress tests including HTGB, HTRB, temperature cycling, and ESD (HBM ≥ 2 kV). This qualification confirms suitability for automotive powertrain, body control, and lighting modules. The SS29LH datasheet revision A2103 documents full test reports and failure analysis methodology used in certification.
What is the forward voltage specification for the SS29LH at elevated temperature?
The SS29LH forward voltage (VF) increases with junction temperature: typical VF is 0.85 V at 25°C and rises to approximately 0.92 V at 125°C (IF = 2 A). This positive temperature coefficient improves current sharing in parallel configurations. The SS29LH datasheet provides Fig.4 (Typical Forward Characteristics) showing VF vs. IF curves across -55°C to +150°C, confirming stable conduction behavior throughout its rated operating range.
How does the SS29LH compare to standard SMA Schottky diodes in thermal performance?
The SS29LH uses Sub SMA packaging-smaller than standard SMA-with optimized leadframe geometry yielding 17 °C/W junction-to-lead thermal resistance, versus ~25–30 °C/W for conventional SMA-packaged Schottkys. This 30–40% improvement allows higher power density in constrained layouts. The SS29LH achieves this while maintaining J-STD-002 solderability and moisture sensitivity level 1, unlike many competing Sub SMA diodes that require baking before reflow.
SS29LH 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):
- 90 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 850 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 90 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
SS29LH FAQ
1.How can I place an order for SS29LH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS29LH 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 SS29LH reliable?
The price and inventory of SS29LH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS29LH is usually 5 days.
3.What payment methods are accepted for SS29LH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS29LH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS29LH?
SS29LH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS29LH 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 SS29LH?
For technical support, including SS29LH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS29LH requirements.
6.How does Aetrix verify that SS29LH is sourced from the original manufacturer or authorized distributors?
All SS29LH 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 SS29LH meets industry standards.
7.What is the process for return or replacement of SS29LH?
All SS29LH units undergo pre-shipment inspection (PSI). If there is an issue with SS29LH, 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 SS29LH part is unused and in its original packaging.
Return procedure for SS29LH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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