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Taiwan Semiconductor Corporation SRAS850H
- Part No.:
- SRAS850H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
SRAS850H.pdf
- Description:
- 8A, 50V, PLANAR SCHOTTKY
- Quantity:
- Payment:
- Shipping:
Inventory:5,728
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Product details
Overview
SRAS850H from Taiwan Semiconductor is an AEC-Q101-qualified 8A, 50V Schottky barrier rectifier in TO-263AB (D2PAK) package, featuring 0.70V forward voltage at 8A/25°C, 150A surge capability, and junction temperature up to +150°C. It serves as a low-loss freewheeling or reverse-battery protection diode in automotive DC/DC converters and LED lighting systems.
For engineers reviewing the SRAS850H datasheet, SRAS850H pinout, SRAS850H application, or SRAS850H equivalent, key selection factors include its 50V VRRM, 3°C/W RθJC, AEC-Q101 qualification, moisture sensitivity level 1 rating, and TO-263AB thermal performance for high-reliability 12V/24V automotive power rails.
Technical Context
This Schottky rectifier uses a single-die construction with guard ring overvoltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its 10,000 V/μs dv/dt rating supports fast-switching topologies without parasitic turn-on.
Thermal design is enabled by a low 3°C/W junction-to-case resistance and UL 94V-0 molding compound. The device operates across –55°C to +150°C junction range, with IR ≤ 100 µA at 25°C and ≤ 5 mA at 100°C under rated reverse voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage for 12V/24V automotive system compatibility |
| IF | 8 A - Continuous forward current rating at case temperature ≤ 110°C |
| IFSM | 150 A - Non-repetitive surge current handling for load dump or inrush events |
| VF | 0.70 V @ 8A, 25°C - Low conduction loss enabling >92% efficiency in 500kHz DC/DC stages |
| RθJC | 3 °C/W - Enables direct heatsinking to PCB copper or external heatsink for thermal management |
| TJ max | +150 °C - Extended junction temperature rating for under-hood automotive environments |
| MSL | Level 1 - No floor life limitation; suitable for standard SMT reflow without dry pack |
Pinout & Package
TO-263AB (D2PAK) package with 3 terminals: Anode, Cathode, and exposed thermal pad (electrically connected to cathode). Case outline conforms to JEDEC MO-211 variation AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input | Connected to input rail (e.g., battery+ or switch node); polarity marked on device body |
| Cathode | Forward current output / reverse blocking terminal | Connected to load or ground return; electrically tied to exposed thermal pad |
| Exposed pad | Thermal path & cathode extension | Must be soldered to ≥200 mm² copper pour for optimal RθJC and reliability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics per stress test requirements |
| Guard ring structure | Prevents edge breakdown at 50V VRRM, improving long-term reliability under transient overvoltage |
| Moisture sensitivity level 1 | Eliminates bake requirement before SMT assembly; reduces manufacturing cost and risk |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for eco-compliant vehicle production |
| High dv/dt immunity | 10,000 V/μs rating prevents false triggering in high-speed synchronous rectifier circuits |
Applications
| Automotive DC/DC Converters | LED Headlamp Drivers |
|---|---|
Use Scenario: Step-down conversion from 12V/48V battery to 5–12V for ECU power rails. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous buck converter secondary side. Use Value: 0.70V VF reduces conduction loss by ~35% vs. silicon diodes, lowering thermal load in confined headlamp modules. | Use Scenario: Constant-current LED string control with reverse-polarity protection. IC Role / Device Role / Timing Role: Reverse battery protection diode placed between battery input and LED driver IC. Use Value: AEC-Q101 qualification ensures operation over –40°C to +125°C ambient, meeting ISO 16750-4 requirements. |
| Start-Stop System Rectification | Industrial 24V Power Supplies |
Use Scenario: Input rectification in alternator-output conditioning modules during engine restart. IC Role / Device Role / Timing Role: Output rectifier handling high di/dt transients during cranking pulses. Use Value: 150A IFSM withstands 100ms load-dump surges without degradation, extending module lifetime. | Use Scenario: Secondary-side rectification in isolated 24V industrial SMPS units. IC Role / Device Role / Timing Role: High-efficiency output diode replacing fast recovery diodes in flyback or forward converters. Use Value: TO-263AB package with 3°C/W RθJC enables >10W dissipation on 4-layer PCB without heatsink. |
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-8EWH05FN-M3 | Same 50V VRRM, 8A IF, but TO-252AA (DPAK); RθJC = 4.5°C/W | Limited thermal performance in high-power density layouts | Prefer SRAS850H where board space allows TO-263AB and thermal margin is critical |
| ON Semiconductor SB850 | 50V VRRM, 8A IF, TO-263AB, but AEC-Q101 not claimed; VF = 0.72V typ | Not qualified for automotive safety-critical subsystems | Select SRAS850H for AEC-Q101–mandated applications like ADAS power supplies |
Compared with VS-8EWH05FN-M3 and SB850, the SRAS850H delivers superior thermal resistance (3°C/W), guaranteed AEC-Q101 compliance, and tighter VF distribution-making it the preferred choice for thermally constrained, automotive-grade 50V rectification.
Availability
SRAS850H is available at Aetrix Electronics and suitable for automotive DC/DC converters, LED lighting systems, and start-stop power modules requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SRAS850H 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 global automotive, industrial, and consumer markets since 1979.
The SRAS8xxH series targets high-reliability automotive power conversion, engineered specifically for AEC-Q101 compliance, low VF stability over temperature, and robust surge immunity in 12V/24V/48V vehicle electrical architectures.
FAQ
What is the maximum junction temperature rating for SRAS850H?
The SRAS850H has a maximum junction temperature (TJ) rating of +150°C, validated per AEC-Q101 stress testing. This allows reliable operation in under-hood automotive environments where case temperatures may exceed +100°C. Derating curves in the SRAS850H datasheet define usable IF versus TC up to this limit.
Is SRAS850H pin-compatible with other devices in the SRAS8xxH family?
Yes, all SRAS8xxH variants-including SRAS850H-share identical TO-263AB (D2PAK) packaging, pinout, and thermal pad configuration. Only VRRM and VF differ across the series; mechanical layout and solder footprint remain fully interchangeable.
Does SRAS850H require special handling for moisture sensitivity?
No. SRAS850H is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be processed using standard SMT reflow profiles without baking or dry-pack requirements-reducing manufacturing complexity and cost.
What is the reverse leakage current specification for SRAS850H at elevated temperature?
At TJ = 100°C and rated VR, the SRAS850H exhibits a maximum reverse current (IR) of 5 mA. At 25°C, IR is limited to 100 µA, ensuring minimal standby power loss in always-on automotive modules.
How does the guard ring feature improve reliability of SRAS850H?
The guard ring in SRAS850H mitigates edge breakdown under transient overvoltage conditions-such as load dump or ISO 7637-2 pulses-by distributing electric field stress away from the active junction periphery. This extends operational lifetime in automotive power rails where voltage spikes up to 100V can occur.
SRAS850H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 700 mV @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263AB (D2PAK)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SRAS850H FAQ
1.How can I place an order for SRAS850H through Aetrix?
Please submit a Request for Quotation (RFQ) for SRAS850H 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 SRAS850H reliable?
The price and inventory of SRAS850H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRAS850H is usually 5 days.
3.What payment methods are accepted for SRAS850H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRAS850H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRAS850H?
SRAS850H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRAS850H 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 SRAS850H?
For technical support, including SRAS850H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRAS850H requirements.
6.How does Aetrix verify that SRAS850H is sourced from the original manufacturer or authorized distributors?
All SRAS850H 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 SRAS850H meets industry standards.
7.What is the process for return or replacement of SRAS850H?
All SRAS850H units undergo pre-shipment inspection (PSI). If there is an issue with SRAS850H, 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 SRAS850H part is unused and in its original packaging.
Return procedure for SRAS850H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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