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Diodes Incorporated SR505-T
- Part No.:
- SR505-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR505-T.pdf
- Description:
- DIODE SCHOTTKY 50V 5A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,559
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Product details
Overview
SR505-T from Diodes Incorporated is a high-current Schottky barrier rectifier in DO-201AD package, rated for 50 V maximum recurrent peak reverse voltage, 5.0 A average forward current at 90°C, and 150 A non-repetitive surge current (8.3 ms half-sine). It delivers low forward voltage drop (0.67 V @ 5.0 A), low thermal resistance (10 K/W), and junction capacitance of 400 pF - optimized for DC-DC output rectification in industrial power supplies.
For engineers reviewing the SR505-T datasheet, SR505-T pinout, SR505-T application, or SR505-T equivalent, key selection criteria include verified VF vs. temperature behavior, lead-to-junction thermal performance under sustained 5 A load, surge robustness in 60 Hz line-fed rectifiers, and compatibility with axial-lead PCB mounting in high-density power stages.
Technical Context
This Schottky rectifier uses a guard-ringed silicon die to enhance transient voltage immunity while maintaining low conduction loss. Its metal-semiconductor junction enables fast switching (no minority-carrier storage) and zero reverse recovery charge, eliminating switching losses in high-frequency secondary-side rectification.
The device operates across –65°C to +150°C, with thermal resistance measured at 10 K/W (junction-to-lead, vertical PC board mount, 9.5 mm lead length) and junction capacitance specified at 400 pF (1 MHz, 4.0 V reverse bias), directly supporting EMI filtering design in offline SMPS outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum blocking voltage in repetitive reverse-biased operation; defines safe operating range in 48 V nominal bus rectification. |
| I(AV) | 5.0 A @ TL = 90°C - Continuous DC output current capability with 9.5 mm lead length heatsinking; supports 24–48 V, ~60 W power stage designs. |
| VF | 0.67 V @ 5.0 A - Forward voltage drop at rated current; determines conduction loss (3.35 W) and thermal rise in linear-regulated or synchronous-FET-assisted topologies. |
| IFSM | 150 A (8.3 ms half-sine) - Surge withstand rating per JEDEC method; ensures reliability during cold-start inrush or output short-circuit events. |
| RθJL | 10 K/W - Junction-to-lead thermal resistance; enables direct estimation of junction temperature rise (ΔTJ = 10 × Pdiss) using lead temperature as proxy. |
| CJ | 400 pF @ 1 MHz, 4.0 V - Junction capacitance value used to calculate high-frequency reverse recovery displacement current and snubber sizing. |
Pinout & Package
Package: DO-201AD - axial-leaded, molded plastic case (UL 94V-0), cathode indicated by band, weight ≈1.20 g. Mounting position unrestricted; terminals solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Input current entry point | Connected to transformer secondary or switching node; must handle full forward current and surge without voltage derating. |
| Cathode (Lead 2, banded) | Output current exit point | Connects to output capacitor and load; polarity marking critical for correct orientation in series/parallel configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances transient voltage immunity without increasing VF - improves reliability in unfiltered AC line environments. |
| Low RθJL (10 K/W) | Enables accurate thermal modeling using lead temperature measurement - simplifies thermal validation in production testing. |
| High IFSM (150 A) | Supports single-event surge tolerance beyond typical 100 A requirements - reduces need for external parallel protection in cost-sensitive designs. |
| DO-201AD mechanical standardization | Ensures compatibility with legacy axial-lead automated insertion equipment and wave-solder fixtures. |
Applications
| Industrial AC-DC Power Supply | Telecom DC-DC Converter Output Stage |
|---|---|
Use Scenario: Secondary-side rectification in 48 V input, 12 V/5 A isolated flyback converter. IC Role / Device Role / Timing Role: Primary unidirectional current path converting transformer AC output to regulated DC; no timing function. Use Value: 0.67 V VF minimizes conduction loss (3.35 W), reducing heatsink size versus standard PN rectifiers with VF > 0.9 V. | Use Scenario: Output rectifier in telecom brick DC-DC module with 36–75 V input range and 3.3 V/5 A output. IC Role / Device Role / Timing Role: High-efficiency freewheeling diode in synchronous rectifier-assisted topology; zero Qrr eliminates switching loss contribution. Use Value: 400 pF CJ enables predictable snubber design at 500 kHz switching frequency; 150 A IFSM handles hot-swap transients. |
| LED Driver Secondary Rectification | Motor Drive Auxiliary Power Supply |
Use Scenario: Rectifying auxiliary winding output in constant-current LED driver with 24 V output. IC Role / Device Role / Timing Role: Low-loss DC generation for gate driver IC bias rail; operates continuously at 100% duty cycle. Use Value: 10 K/W RθJL allows direct thermal coupling to PCB copper pour - achieves <125°C junction temp at 5 A ambient 70°C. | Use Scenario: Input rectification for 24 V auxiliary supply powering MCU and gate drivers in 3-phase inverter. IC Role / Device Role / Timing Role: Unidirectional energy transfer from transformer to bulk capacitor; withstands repeated 150 A surges during motor stall events. Use Value: Guard ring prevents premature breakdown during voltage spikes induced by IGBT commutation ringing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB550-T | Same DO-201AD package; VF = 0.55 V @ 5 A (lower), VRRM = 50 V, IFSM = 120 A (lower) | Better efficiency at light loads; reduced surge margin in high-inrush systems | Select when conduction loss dominates thermal budget and surge events are infrequent. |
| SS5P5 | DO-214AC (SMA) package; VF = 0.63 V @ 5 A; IFSM = 150 A; surface-mount only | Requires rework of PCB layout; eliminates axial lead assembly but increases thermal resistance (RθJA ≈ 50 K/W) | Choose for automated SMT production where board space is constrained and thermal management uses copper slugs. |
Compared with SB550-T and SS5P5, SR505-T offers balanced trade-offs: higher VF than SB550-T but superior surge rating, and axial-leaded mechanical robustness versus SS5P5's SMT-only form factor - making it optimal for field-serviceable industrial power modules.
Availability
SR505-T is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, telecom DC-DC converters, and motor drive auxiliary power supplies requiring stable component supply and long-term manufacturability.
Supply support for SR505-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The SR-series Schottky rectifiers target cost-sensitive, high-reliability power conversion applications where axial-leaded packaging, surge resilience, and thermal predictability are prioritized over ultra-low VF or SMT footprint.
FAQ
What is the maximum allowable junction temperature for SR505-T?
The SR505-T has a specified storage and operating junction temperature range of –65°C to +150°C. Its absolute maximum junction temperature is +150°C; sustained operation above this limit risks irreversible degradation of the Schottky barrier interface and increased reverse leakage.
Can SR505-T be used in parallel configurations?
Yes, but only with matched VF devices and symmetrical PCB trace lengths. Due to positive temperature coefficient of VF, parallel operation requires thermal coupling between units and current-sharing resistors (typically 0.01 Ω) to prevent thermal runaway under uneven loading.
Is SR505-T RoHS compliant and halogen-free?
Yes - Diodes Incorporated confirms SR505-T meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The DO-201AD molding compound carries UL 94V-0 flammability rating and contains no brominated flame retardants.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
This advisory reflects Diodes Incorporated's migration toward newer Schottky families (e.g., SB5xx-T) with improved VF and surge specs. SR505-T remains fully qualified and supported for existing designs, with no announced obsolescence date or last-time-buy notice.
SR505-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 670 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SR505-T FAQ
1.How can I place an order for SR505-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SR505-T 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 SR505-T reliable?
The price and inventory of SR505-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR505-T is usually 5 days.
3.What payment methods are accepted for SR505-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR505-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR505-T?
SR505-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR505-T 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 SR505-T?
For technical support, including SR505-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR505-T requirements.
6.How does Aetrix verify that SR505-T is sourced from the original manufacturer or authorized distributors?
All SR505-T 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 SR505-T meets industry standards.
7.What is the process for return or replacement of SR505-T?
All SR505-T units undergo pre-shipment inspection (PSI). If there is an issue with SR505-T, 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 SR505-T part is unused and in its original packaging.
Return procedure for SR505-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR505-T Tags
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