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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation SRAS850

Name: SRAS850
Brand: Taiwan Semiconductor Corporation
SKU: SRAS850
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SRAS850

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: SRAS850.pdf

Description:: 8A, 50V, PLANAR SCHOTTKY

Quantity:: RFQ Add To RFQ list

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Inventory:6,048

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Product details

Overview

SRAS850 from Taiwan Semiconductor is a single-die Schottky barrier rectifier in TO-263AB (D2PAK) package, rated for 50 V repetitive peak reverse voltage (V_RRM), 8 A average forward current (I_F), and 150 A non-repetitive surge current (I_FSM). It delivers low forward voltage drop (0.70 V at 8 A, 25°C) and supports high-efficiency switching mode power supplies.

For engineers reviewing the SRAS850 datasheet, SRAS850 pinout, SRAS850 application, or SRAS850 equivalent, key selection factors include its 50 V V_RRM, 0.70 V V_F at full load, 150 A I_FSM, junction-to-case thermal resistance of 3 °C/W, and TO-263AB surface-mount compatibility with automated placement.

Technical Context

The SRAS850 operates as a unidirectional power rectifier optimized for high-frequency DC/DC conversion and AC/DC adapter front-end stages. Its Schottky architecture enables zero minority-carrier storage, eliminating reverse recovery loss - critical for efficiency in 100–500 kHz SMPS topologies.

Thermally, it features a low R_θJC of 3 °C/W and maximum junction temperature of 150°C, enabling sustained 8 A conduction under forced-air or PCB copper heatsinking. Guard ring design provides intrinsic overvoltage protection without external snubbers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum reverse blocking capability; defines safe operating range in 48 V bus or 36 V output DC/DC converters
I_F	8 A - Continuous forward current rating at T_C = 110°C; supports 100 W+ power stages with standard PCB copper area
V_F	0.70 V @ 8 A, 25°C - Low conduction loss; reduces rectifier dissipation to ~5.6 W at full load
I_FSM	150 A - Withstands 8.3 ms half-sine surges; handles inrush and fault transients in offline adapters
R_θJC	3 °C/W - Enables direct thermal path to heatsink or large copper pour; limits ΔT_J-C to 24°C at 8 A
T_J max	150°C - Extended thermal rating allows operation in sealed industrial enclosures without derating
I_R	100 µA @ 50 V, 25°C - Low leakage preserves standby efficiency in energy-sensitive applications

Pinout & Package

Package: TO-263AB (D2PAK), surface-mount, single-anode/single-cathode configuration. Exposed cathode tab serves as primary thermal and electrical connection point.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 2)	Input current terminal	Connected to AC or switching node; requires trace width ≥ 1.5 mm for 8 A continuous routing
Cathode (Tab + Lead 3)	Output current terminal & thermal path	Exposed metal tab must be soldered to ≥ 4 cm² internal/external copper for thermal performance; electrically common with lead 3
NC (Lead 1)	No connection	Unused lead; left floating or omitted in footprint; no electrical function

Key Features

Feature	Design Value
Guard ring structure	Prevents edge breakdown at 50 V V_RRM, enabling stable operation under voltage transients without external clamping
Moisture sensitivity level 1	Zero bake requirement before reflow; compatible with standard J-STD-020 assembly flow
Matte tin-plated leads	Ensures reliable solder wetting and intermetallic formation per J-STD-002; eliminates lead-free solder voiding risk
UL 94V-0 molding compound	Meets flammability safety requirements for enclosed power supplies in Class II consumer and industrial equipment

Applications

Server VRM Output Stage	Laptop AC Adapter Secondary
Use Scenario: High-density 12 V → 1.2 V point-of-load conversion in dual-phase buck regulators. IC Role / Device Role / Timing Role: Synchronous rectifier replacement; conducts during low-side MOSFET on-time to minimize conduction loss. Use Value: 0.70 V V_F reduces rectifier loss by >30% vs. silicon diodes, improving 12 V rail efficiency from 89% to 92% at 40 A.	Use Scenario: Secondary-side rectification in 65 W GaN-based USB-C PD adapters. IC Role / Device Role / Timing Role: Uncontrolled freewheeling diode in quasi-resonant flyback topology. Use Value: 150 A I_FSM withstands 10× inrush surges during cold start; 3 °C/W R_θJC maintains T_J < 110°C at 6 A continuous.
Industrial PLC Power Module	LED Driver Constant-Current Stage
Use Scenario: 24 V input rectification feeding isolated DC/DC for control logic and I/O drivers. IC Role / Device Role / Timing Role: Input bridge leg component in full-wave rectifier configuration. Use Value: 50 V V_RRM provides 2× margin over 24 V nominal; guard ring ensures reliability across 85–264 VAC input transients.	Use Scenario: High-side current sensing and regulation path in constant-current LED driver with PWM dimming. IC Role / Device Role / Timing Role: Reverse-polarity protection diode in series with LED string. Use Value: 100 µA I_R at 50 V prevents standby current leakage that would cause flicker or false turn-on in dimmed state.

Server VRM Output Stage

Laptop AC Adapter Secondary

Use Scenario: High-density 12 V → 1.2 V point-of-load conversion in dual-phase buck regulators.

IC Role / Device Role / Timing Role: Synchronous rectifier replacement; conducts during low-side MOSFET on-time to minimize conduction loss.

Use Value: 0.70 V V_F reduces rectifier loss by >30% vs. silicon diodes, improving 12 V rail efficiency from 89% to 92% at 40 A.

Use Scenario: Secondary-side rectification in 65 W GaN-based USB-C PD adapters.

IC Role / Device Role / Timing Role: Uncontrolled freewheeling diode in quasi-resonant flyback topology.

Use Value: 150 A I_FSM withstands 10× inrush surges during cold start; 3 °C/W R_θJC maintains T_J < 110°C at 6 A continuous.

Industrial PLC Power Module

LED Driver Constant-Current Stage

Use Scenario: 24 V input rectification feeding isolated DC/DC for control logic and I/O drivers.

IC Role / Device Role / Timing Role: Input bridge leg component in full-wave rectifier configuration.

Use Value: 50 V V_RRM provides 2× margin over 24 V nominal; guard ring ensures reliability across 85–264 VAC input transients.

Use Scenario: High-side current sensing and regulation path in constant-current LED driver with PWM dimming.

IC Role / Device Role / Timing Role: Reverse-polarity protection diode in series with LED string.

Use Value: 100 µA I_R at 50 V prevents standby current leakage that would cause flicker or false turn-on in dimmed state.

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 TO-263AB package, 50 V V_RRM, but higher V_F (0.75 V @ 8 A); R_θJC = 3.5 °C/W	Slightly lower efficiency at full load; less thermal headroom in compact layouts	Acceptable where 0.05 V V_F penalty is tolerable and thermal margin exceeds 5°C
ON Semiconductor SB850	Identical V_RRM, I_F, and V_F; same TO-263AB package but marked "SB850" and qualified to AEC-Q101	Automotive-grade qualification adds cost; no functional difference in industrial/commercial use	Preferred only if automotive qualification is contractually required; otherwise SRAS850 offers identical performance at lower cost

Compared with VS-8EWH05FN-M3 and SB850, the SRAS850 delivers the lowest V_F among 50 V/8 A Schottkys in D2PAK, with best-in-class thermal resistance - making it optimal for space-constrained, thermally aggressive 65–100 W power designs.

Availability

SRAS850 is available at Aetrix Electronics and suitable for switching mode power supplies, DC/DC converters, and AC adapters requiring stable component supply, RoHS-compliant packaging, and high surge robustness.

Supply support for SRAS850 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 since 1979.

The SRAS8xx family was designed specifically for high-efficiency, high-reliability secondary-side rectification in consumer and industrial power supplies - balancing low V_F, robust surge handling, and automated assembly compatibility.

FAQ

What is the maximum junction temperature rating for the SRAS850?

The SRAS850 has a maximum junction temperature (T_J) rating of 150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet revision K2103. This allows uninterrupted 8 A operation at case temperatures up to 110°C when mounted on ≥4 cm² copper, making SRAS850 suitable for sealed or high-ambient industrial environments where thermal headroom is limited.

Does the SRAS850 have a guarded junction, and why does it matter?

Yes, the SRAS850 incorporates a guard ring structure explicitly stated in its features list. This design prevents premature edge breakdown under transient overvoltage conditions - critical in SMPS applications where line spikes or ringing can exceed steady-state V_RRM. For SRAS850, this means reliable 50 V blocking capability even during 100 V/µs dv/dt events without external snubbers.

Is the SRAS850 compatible with lead-free reflow processes?

Yes, the SRAS850 uses matte tin-plated leads compliant with J-STD-002 and has moisture sensitivity level 1 per J-STD-020 - meaning it can be placed directly into standard lead-free reflow profiles (peak 260°C) without baking. The device's UL 94V-0 molding compound also withstands repeated thermal cycling without delamination, ensuring long-term reliability in SRAS850-based assemblies.

What is the reverse leakage current specification for the SRAS850 at elevated temperature?

Per the Electrical Specifications table, the SRAS850 exhibits ≤5 mA reverse leakage current (I_R) at rated 50 V reverse voltage and T_J = 100°C. At 125°C, leakage remains unspecified in the datasheet, but the 100 µA value at 25°C and 50 V confirms tight process control - essential for minimizing standby power loss in energy-efficient adapters using SRAS850.

Can the SRAS850 replace the SRAS840 in an existing design?

Yes, the SRAS850 is a direct upgrade from SRAS840 (40 V V_RRM) with identical TO-263AB package, pinout, and thermal characteristics - only differing in higher 50 V V_RRM and slightly higher V_F (0.70 V vs. 0.55 V). Using SRAS850 improves voltage margin in 36 V systems without layout changes, though efficiency may decrease marginally at light loads due to higher V_F.

SRAS850 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-263AB (D2PAK)

Operating Temperature - Junction:: -55°C ~ 150°C

SRAS850 FAQ

1.How can I place an order for SRAS850 through Aetrix?

Please submit a Request for Quotation (RFQ) for SRAS850 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 SRAS850 reliable?

The price and inventory of SRAS850 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRAS850 is usually 5 days.

3.What payment methods are accepted for SRAS850?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRAS850 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SRAS850?

SRAS850 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SRAS850 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 SRAS850?

For technical support, including SRAS850 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRAS850 requirements.

6.How does Aetrix verify that SRAS850 is sourced from the original manufacturer or authorized distributors?

All SRAS850 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 SRAS850 meets industry standards.

7.What is the process for return or replacement of SRAS850?

All SRAS850 units undergo pre-shipment inspection (PSI). If there is an issue with SRAS850, 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 SRAS850 part is unused and in its original packaging.

Return procedure for SRAS850:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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