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Taiwan Semiconductor Corporation RS1ALH
- Part No.:
- RS1ALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
RS1ALH.pdf
- Description:
- 150NS, 0.8A, 50V, FAST RECOVERY
- Quantity:
- Payment:
- Shipping:
Inventory:2,307
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Product details
Overview
RS1ALH from Taiwan Semiconductor is a fast recovery surface-mount rectifier diode with 50 V repetitive peak reverse voltage (VRRM), 0.8 A average forward current (IF), and 150 ns reverse recovery time (trr), designed for DC-DC converters and automotive freewheeling paths where low conduction loss and rapid switching are required.
For engineers reviewing the RS1ALH datasheet, RS1ALH pinout, RS1ALH application, or RS1ALH equivalent, key selection criteria include its Sub SMA package compatibility with automated placement, AEC-Q101 qualification for automotive use, glass-passivated junction for reliability, and 1.3 V max forward voltage at 0.8 A.
Technical Context
The RS1ALH is a single-die, unidirectional fast recovery rectifier optimized for high-frequency switching in power conversion circuits. Its 150 ns trr and 10 pF junction capacitance enable efficient operation in 100–500 kHz DC-DC topologies while minimizing switching losses and EMI generation.
Thermally, it features a junction-to-lead thermal resistance of 32 °C/W and operates across –55 °C to +150 °C junction temperature range. The device uses a glass-passivated chip junction and matte tin-plated leads compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling configurations |
| IF | 0.8 A - Continuous average forward current; sets maximum steady-state power handling capability |
| trr | 150 ns - Reverse recovery time; determines minimum off-time and switching frequency ceiling in SMPS |
| VF (max) | 1.3 V @ 0.8 A - Forward voltage drop; directly impacts conduction loss and thermal design in high-duty-cycle applications |
| RθJL | 32 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pour thermal management without heatsink |
| IR (max) | 5 µA @ 25°C - Reverse leakage current; critical for low-power standby and snubber circuit stability |
Pinout & Package
Package: Sub SMA - Surface-mount plastic package with cathode band marking, UL 94V-0 rated molding compound, and matte tin-plated leads for reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node in buck converter); polarity must match layout marking |
| Cathode | Forward current exit / reverse blocking terminal | Marked by visible band; ties to higher-potential rail (e.g., output capacitor positive) in rectification path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per stress test requirements |
| Glass passivated junction | Provides hermetic protection against moisture and contaminants, extending lifetime in humid or under-hood environments |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly lines without dry pack handling |
| Fast switching (150 ns trr) | Reduces turn-off energy loss and enables >200 kHz operation in compact DC-DC designs |
Applications
| DC-DC Converter | Automotive Lighting |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters powering infotainment systems. IC Role / Device Role / Timing Role: Fast recovery rectifier conducting during transformer reset phase; replaces slower general-purpose diodes to reduce losses. Use Value: 150 ns trr and 1.3 V VF minimize conduction and switching losses, improving efficiency by ~2–3% over 1N4007-class devices. | Use Scenario: LED driver output stage in headlamp or DRL modules requiring transient robustness and thermal stability. IC Role / Device Role / Timing Role: Freewheeling diode across inductive LED current regulators to clamp back-EMF during PWM dimming. Use Value: AEC-Q101 qualification and 150°C TJ max ensure reliable operation under hood temperatures up to 125°C ambient. |
| Snubber Network | Freewheeling Path |
Use Scenario: RCD snubber across MOSFETs in boost PFC stages to suppress voltage spikes during turn-off. IC Role / Device Role / Timing Role: Fast-recovery diode clamping transient energy into RC network; requires low trr to avoid delayed conduction. Use Value: 150 ns trr ensures timely clamping within <200 ns of MOSFET turn-off, preventing overshoot beyond 60 V rating. | Use Scenario: Inductive load flyback path in automotive body control modules (e.g., window lift motors, solenoid valves). IC Role / Device Role / Timing Role: Unidirectional freewheeling diode providing continuous current path when driving transistor turns off. Use Value: Glass passivation and JESD201 Class 2 whisker resistance prevent field failures due to vibration-induced metallurgical degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR105 | VRRM = 50 V, IF = 1.0 A, trr = 75 ns, DO-41 package | Through-hole mounting; higher IF but larger footprint and no AEC-Q101 qualification | Preferred for prototyping or non-automotive cost-sensitive designs where board space allows through-hole |
| Vishay VS-1EQH05-M3/5AT | VRRM = 50 V, IF = 1.0 A, trr = 100 ns, SMA package, AEC-Q101 qualified | Slightly faster trr and higher IF, but 10% higher VF (1.45 V max) and tighter IR spec (1 µA max) | Better for high-efficiency, high-reliability automotive applications where 100 ns trr and lower leakage justify premium cost |
Compared with RS1ALH, MUR105 offers higher current and faster recovery but lacks automotive qualification and surface-mount compatibility, while VS-1EQH05-M3/5AT matches AEC-Q101 compliance and SMA packaging but trades higher forward voltage for improved speed and leakage performance.
Availability
RS1ALH is available at Aetrix Electronics and suitable for DC-DC converters, automotive lighting systems, and snubber networks requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for RS1ALH 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 diodes, and MOSFETs for industrial and automotive markets.
The RS1ALH belongs to TSC's RS1xLH fast recovery rectifier family, engineered specifically for high-frequency, high-reliability power conversion in automotive and industrial environments where thermal robustness and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum junction temperature rating for RS1ALH?
The RS1ALH has a maximum junction temperature (TJ max) of +150 °C, enabling operation in under-hood automotive environments and high-density power supplies. This rating is validated per AEC-Q101 stress testing and supported by its 32 °C/W junction-to-lead thermal resistance. Derating curves in the RS1ALH datasheet confirm sustained 0.8 A operation up to 125 °C ambient with adequate PCB copper area.
Is RS1ALH suitable for automotive applications?
Yes, RS1ALH is AEC-Q101 qualified and explicitly listed for automotive applications including car lighting and DC-DC converters. Its glass-passivated junction, JESD201 Class 2 whisker resistance, and –55 °C to +150 °C operating range meet automotive reliability requirements. The RS1ALH marking code "RAL" and Sub SMA package are designated for automotive-grade production per TSC's A2103 revision documentation.
What does the "ALH" suffix indicate in RS1ALH?
The "ALH" suffix in RS1ALH specifies the 50 V VRRM variant within the RS1xLH family, where "A" denotes 50 V, "L" indicates Sub SMA package, and "H" signifies halogen-free construction per IEC 61249-2-21. This coding is consistent across TSC's ordering matrix and distinguishes RS1ALH from RS1BLH (100 V), RS1DLH (200 V), and other voltage grades.
What is the reverse recovery time (trr) of RS1ALH and how is it measured?
The RS1ALH has a maximum reverse recovery time (trr) of 150 ns, measured under conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per JEDEC standard test circuit. This value is confirmed in the "ELECTRICAL SPECIFICATIONS" table on page 2 of the RS1ALH datasheet (Version A2103) and applies specifically to the RS1ALH variant-not higher-voltage members of the family.
Does RS1ALH have RoHS and halogen-free compliance?
Yes, RS1ALH is RoHS compliant and halogen-free per IEC 61249-2-21, as stated in the official TSC product brief and datasheet (Version A2103). The Sub SMA molding compound contains no brominated flame retardants, and the matte tin-plated leads meet RoHS Annex II substance restrictions. Compliance is verified via material declarations and third-party lab testing.
RS1ALH 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:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 800 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 150 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 10pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS1ALH FAQ
1.How can I place an order for RS1ALH through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1ALH 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 RS1ALH reliable?
The price and inventory of RS1ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1ALH is usually 5 days.
3.What payment methods are accepted for RS1ALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1ALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1ALH?
RS1ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1ALH 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 RS1ALH?
For technical support, including RS1ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1ALH requirements.
6.How does Aetrix verify that RS1ALH is sourced from the original manufacturer or authorized distributors?
All RS1ALH 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 RS1ALH meets industry standards.
7.What is the process for return or replacement of RS1ALH?
All RS1ALH units undergo pre-shipment inspection (PSI). If there is an issue with RS1ALH, 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 RS1ALH part is unused and in its original packaging.
Return procedure for RS1ALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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