My Inquiry
My Account
Diodes Incorporated SR504-T
- Part No.:
- SR504-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR504-T.pdf
- Description:
- DIODE SCHOTTKY 40V 5A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:6,983
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SR504-T from Diodes Incorporated is a high-current Schottky barrier rectifier in DO-201AD package, rated for 40 V maximum recurrent peak reverse voltage, 5.0 A average forward current at 90°C, and 0.67 V forward voltage at 5.0 A. It delivers low power loss and high efficiency in DC/DC converter output stages and AC adapter secondary-side rectification.
For engineers reviewing the SR504-T datasheet, SR504-T pinout, SR504-T application, or SR504-T equivalent, key selection criteria include its 150 A non-repetitive surge rating, 10 K/W junction-to-lead thermal resistance, 400 pF junction capacitance at 4.0 V, cathode-band polarity marking, and UL 94V-0 flammability compliance.
Technical Context
This axial-lead Schottky rectifier uses a guard-ringed die structure to enhance transient voltage immunity and improve reliability under repetitive surge conditions. Its low VF (0.67 V @ 5 A) and low RθJL (10 K/W) enable efficient operation in high-duty-cycle, thermally constrained power supplies.
The device operates across –65°C to +150°C junction temperature range and exhibits typical junction capacitance of 400 pF at 1 MHz and 4.0 V reverse bias-critical for EMI-sensitive switching applications where parasitic capacitance affects noise coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum sustained reverse voltage before breakdown; defines safe operating limit in 36 V nominal systems. |
| I(AV) | 5.0 A @ TL = 90°C - Continuous DC output current capability with 9.5 mm lead length; sets minimum heatsinking requirement. |
| VF | 0.67 V @ 5.0 A - Forward conduction loss directly impacts system efficiency; enables >92% efficiency in 5 V output converters. |
| IFSM | 150 A (8.3 ms half-sine) - Withstands inrush surges during hot-plug or capacitor charging without degradation. |
| RθJL | 10 K/W - Thermal resistance from junction to lead; determines temperature rise per watt dissipated in lead-mounted PCB layouts. |
| CJ | 400 pF @ 1 MHz, 4.0 V - Junction capacitance influences high-frequency switching noise and snubber design in flyback or LLC topologies. |
Pinout & Package
Package: DO-201AD molded plastic case with axial leads, UL 94V-0 rated, cathode identified by band. Mounting position unrestricted; weight ≈1.20 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point under forward bias | Connected to transformer secondary or switch node; must handle full load current and surge transients. |
| Cathode (banded end) | Current exit point under forward bias | Routes rectified output to filter capacitor; polarity marking prevents reverse installation in production. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances transient voltage immunity and improves long-term reliability under repetitive line surges. |
| Low forward voltage drop | 0.67 V @ 5 A reduces conduction loss by ~35% vs. comparable silicon rectifiers, lowering thermal stress. |
| High surge current rating | 150 A IFSM supports robust startup behavior in offline SMPS with large bulk capacitors. |
| UL 94V-0 plastic case | Meets flame-retardancy requirements for Class II AC/DC adapters and industrial power supplies. |
Applications
| AC-DC Adapter Output Rectification | DC/DC Converter Secondary Side |
|---|---|
Use Scenario: 12 V/5 A output stage in wall-mount AC/DC adapter with 60 Hz input and capacitive-input filter. IC Role / Device Role / Timing Role: Primary unidirectional current path converting transformer AC to regulated DC; conducts only during positive half-cycles. Use Value: 0.67 V VF minimizes heat generation in confined enclosures; 10 K/W RθJL allows adequate thermal relief via PCB copper pour. | Use Scenario: Synchronous rectifier replacement in isolated 5 V/3 A flyback converter for PoE-powered devices. IC Role / Device Role / Timing Role: Passive rectifier in secondary winding circuit; provides low-loss conduction without gate drive complexity. Use Value: 400 pF CJ limits high-frequency ringing; 150 A IFSM accommodates output capacitor inrush during power-up sequences. |
| Industrial Power Supply Input Stage | LED Driver Constant-Current Output |
Use Scenario: Input rectification in 24 V/10 A industrial DIN-rail power supply with wide ambient range (–25°C to +70°C). IC Role / Device Role / Timing Role: Half-wave rectifier feeding bulk capacitor; handles continuous 5 A load plus line transients. Use Value: –65°C to +150°C operating range ensures functionality in uncontrolled environments; guard ring suppresses ESD-induced latch-up. | Use Scenario: Output rectification in constant-current LED driver for street lighting (36 V string, 1.05 A). IC Role / Device Role / Timing Role: Freewheeling path for inductive current during PWM off-time; maintains current continuity through LED string. Use Value: Low VF preserves headroom for current regulation IC; 40 V VRRM provides 10 V margin above 36 V string voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB540 | Same DO-201AD package, 40 V VRRM, but lower VF (0.55 V @ 5 A) and higher IFSM (200 A); RθJL = 8 K/W. | Better efficiency in thermally limited designs; tighter layout tolerance due to lower thermal resistance. | Select SB540 when minimizing conduction loss or improving thermal margin is prioritized over legacy footprint compatibility. |
| SS54 | DO-214AC (SMA) package, 40 V VRRM, VF = 0.55 V @ 5 A, IFSM = 150 A, RθJA = 45 K/W (no lead heatsinking). | Surface-mount alternative requiring PCB rework; lacks axial-lead mechanical retention and lead-based thermal path. | Choose SS54 only for new SMT-only designs where board space and assembly automation outweigh thermal performance trade-offs. |
Compared with SR504-T, SB540 offers superior thermal and electrical performance in the same through-hole footprint, while SS54 trades mechanical robustness and lead-based cooling for SMT compatibility-neither is a drop-in replacement without layout or thermal validation.
Availability
SR504-T is available at Aetrix Electronics and suitable for AC/DC adapters, industrial power supplies, LED drivers, and DC/DC converter secondary-side rectification requiring stable component supply and long-lifecycle support.
Supply support for SR504-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, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The SR502–SR506 series targets cost-sensitive, high-volume power conversion applications where reliability, surge robustness, and thermal performance are critical-designed specifically for secondary-side rectification in off-line and isolated DC/DC systems.
FAQ
Is SR504-T suitable for synchronous rectification circuits?
No. SR504-T is a passive Schottky rectifier with fixed anode–cathode polarity and no control terminals. It cannot replace active MOSFET-based synchronous rectifiers that require gate drive signals and timing coordination with primary-side switching.
What is the maximum allowable lead temperature during soldering?
The SR504-T axial leads are rated for soldering at 260°C for up to 10 seconds per J-STD-020, consistent with MIL-STD-202 Method 208. Exceeding this risks internal bond wire damage and parameter shift, especially in VF and leakage.
Does SR504-T meet RoHS and REACH requirements?
Yes. Diodes Incorporated confirms SR504-T complies with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, including exemption 7a for lead in high-melting-temperature solder alloys used in internal construction.
Can SR504-T be used in place of SR503 or SR505?
Only with circuit-level verification. SR504-T has 40 V VRRM-lower than SR505 (50 V) and higher than SR503 (30 V). Substitution may cause overvoltage failure in 48 V systems or unnecessary derating in 24 V designs; forward voltage and thermal characteristics also differ.
SR504-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):
- 40 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SR504-T FAQ
1.How can I place an order for SR504-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SR504-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 SR504-T reliable?
The price and inventory of SR504-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR504-T is usually 5 days.
3.What payment methods are accepted for SR504-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR504-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR504-T?
SR504-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR504-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 SR504-T?
For technical support, including SR504-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR504-T requirements.
6.How does Aetrix verify that SR504-T is sourced from the original manufacturer or authorized distributors?
All SR504-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 SR504-T meets industry standards.
7.What is the process for return or replacement of SR504-T?
All SR504-T units undergo pre-shipment inspection (PSI). If there is an issue with SR504-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 SR504-T part is unused and in its original packaging.
Return procedure for SR504-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR504-T Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
