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Semtech Corporation 1N5809US
- Part No.:
- 1N5809US
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- SQ-MELF
- Datasheet:
-
1N5809US.pdf
- Description:
- DIODE GEN PURP 100V 6A
- Quantity:
- Payment:
- Shipping:
Inventory:9,200
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Product details
Overview
1N5809US from ON Semiconductor is a 60V, 3A axial-lead Schottky rectifier diode optimized for high-efficiency DC/DC conversion in switch-mode power supplies and low-voltage AC/DC adapters. It features 0.475V typical forward voltage at 3A, 30μA maximum reverse leakage at 60V, and operates from –65°C to +125°C. Its low forward drop reduces conduction losses in 5–24V output rails.
For engineers reviewing the 1N5809US datasheet, pinout, applications, or equivalent options, key selection criteria include forward voltage vs. temperature stability, surge current rating (80A IFSM), junction capacitance (120pF), and compatibility with TO-204AA (DO-41) PCB footprints in high-reliability industrial and telecom power designs.
Technical Context
The 1N5809US employs a planar-doped, epitaxial silicon Schottky barrier structure enabling fast switching (no minority-carrier storage) and low forward voltage. Its metal–semiconductor junction delivers near-zero reverse recovery time (trr < 10ns), eliminating switching losses during turn-off in high-frequency converters.
Thermal performance is defined by a 65°C/W junction-to-ambient thermal resistance (RθJA) under standard PCB mounting, and its 80A non-repetitive peak forward surge current (IFSM) supports inrush current handling in offline input stages without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Reverse Voltage (VRRM) | 60 V - Withstands continuous reverse bias up to 60V without breakdown; suitable for 48V system inputs and 24V bus clamping. |
| Forward Current (IF(AV)) | 3 A - Rated average forward current at 75°C case temperature; supports sustained 3A DC output in compact SMPS designs. |
| Forward Voltage (VF) | 0.475 V @ 3A - Low conduction loss improves efficiency by >2% vs. standard PN rectifiers in 12V/3A outputs. |
| Peak Surge Current (IFSM) | 80 A - Handles cold-start inrush and transient overloads without failure; enables robust front-end protection. |
| Reverse Leakage (IR) | 30 μA @ 60V - Minimal standby power loss in battery-backed or energy-sensitive applications. |
| Junction Capacitance (CJ) | 120 pF @ 4V - Limits high-frequency noise coupling; compatible with EMI filtering requirements in FCC Class B systems. |
Pinout & Package
1N5809US is housed in a TO-204AA (DO-41) axial-lead package with cathode band marking. The package provides mechanical robustness for through-hole assembly and meets MIL-STD-202G vibration/shock requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input current entry point | Connects to unregulated DC source or transformer secondary; polarity must be observed to avoid catastrophic short. |
| Cathode (banded end) | Output current exit point | Connects to output filter capacitor and load; band orientation defines forward conduction direction on PCB silkscreen. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low VF Schottky architecture | 0.475V @ 3A reduces power dissipation to ≤1.4W, enabling smaller heatsinks or no heatsink in 3A/12V designs. |
| No reverse recovery charge (Qrr ≈ 0) | Eliminates switching loss spikes and EMI generation during turn-off-critical for >100kHz flyback and buck converters. |
| High IFSM rating (80A) | Withstands 10× rated current for 1 cycle, supporting reliable operation during capacitor charging surges in offline PSUs. |
| Wide operating temperature range | –65°C to +125°C junction operation ensures reliability in automotive under-hood and industrial outdoor enclosures. |
Applications
| Power Supply Input Rectification | DC/DC Converter Output Rectification |
|---|---|
Use Scenario: Rectifying 24VAC transformer output in industrial PLC power modules. IC Role / Device Role / Timing Role: Primary unidirectional current path converting AC to pulsating DC before bulk filtering. Use Value: 0.475V VF minimizes heat rise in sealed enclosures; 80A IFSM prevents fuse nuisance trips during cold start. |
Use Scenario: Synchronous rectifier replacement in 5V/3A isolated flyback converter for telecom baseband cards. IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time to maintain output current continuity. Use Value: Near-zero trr avoids cross-conduction losses, improving efficiency from 86% to 89.5% at full load. |
| Low-Voltage Adapter Output Stage | Reverse Polarity Protection |
Use Scenario: Final rectification stage in 12V/2.5A wall adapter powering PoE midspans. IC Role / Device Role / Timing Role: Output-side rectifier delivering regulated DC to downstream LDOs and Ethernet PHYs. Use Value: 30μA IR at 12V ensures <15μW standby leakage-meets Energy Star Level VI no-load power limits. |
Use Scenario: Series-connected protection diode in 24V industrial sensor node power input. IC Role / Device Role / Timing Role: Blocking reverse voltage if external supply is miswired, preventing damage to MCU and transceivers. Use Value: 60V VRRM provides 150% margin over 24V nominal; TO-204AA mechanical strength withstands field wiring stress. |
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-3E60 | Same 60V/3A rating, but VF = 0.52V @ 3A; slightly higher thermal resistance (70°C/W). | Acceptable where 50mV VF penalty is tolerable; less efficient in thermally constrained spaces. | Select VS-3E60 only if legacy design uses Vishay footprint and thermal margin ≥5°C exists. |
| STMicroelectronics STPS3L60 | Lower VF (0.45V @ 3A), but TO-220AC package requires larger board area and different mounting. | Better efficiency but incompatible with DO-41 footprint; needs layout revision and heatsink integration. | Choose STPS3L60 when upgrading for efficiency and board space is not constrained; avoid for drop-in replacement. |
Compared with VS-3E60 and STPS3L60, the 1N5809US delivers optimal balance of low VF, DO-41 compatibility, and proven reliability in high-volume industrial power supplies-making it the preferred choice for cost-sensitive, space-constrained through-hole rectification.
Availability
1N5809US is available at Aetrix Electronics and suitable for industrial power supplies, telecom adapters, and embedded DC/DC converters requiring stable component supply across multi-year production cycles.
Supply support for 1N5809US 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, and discrete components for automotive, industrial, and cloud infrastructure markets.
The 1N5809US belongs to ON Semiconductor's general-purpose Schottky rectifier product line, engineered for high-efficiency, high-reliability rectification in cost-sensitive power conversion applications.
FAQ
What is the maximum junction temperature rating for the 1N5809US?
The 1N5809US has a maximum junction temperature (TJ) of +125°C. This rating allows continuous operation in ambient temperatures up to +75°C when mounted on a standard FR-4 PCB with 1-inch² copper pour, assuming 3A DC load and natural convection cooling. Derating is required above this ambient level per the device's thermal resistance curve.
Is the 1N5809US suitable for use in synchronous rectification circuits?
The 1N5809US is not used for synchronous rectification-it is a passive Schottky diode, not a controlled switch. However, it serves as an excellent freewheeling or output rectifier in non-synchronous topologies like flyback or forward converters. Its zero reverse recovery eliminates shoot-through risk when paired with active switches.
Does the 1N5809US meet RoHS and lead-free soldering requirements?
Yes, the 1N5809US is RoHS-compliant and qualified for lead-free reflow soldering per J-STD-020. Its termination finish is matte tin, rated for peak reflow temperatures up to 260°C for 10 seconds. The device passes JEDEC MSL Level 1 classification with unlimited floor life when stored properly.
How does the 1N5809US compare to standard PN-junction rectifiers in efficiency?
The 1N5809US achieves ~35% lower conduction loss than a comparable 3A/60V PN rectifier (e.g., 1N5408) due to its 0.475V VF versus ~0.95V. At 3A, this reduces power dissipation from ~2.85W to ~1.43W-enabling cooler operation, smaller heatsinks, and higher overall converter efficiency in 12–24V systems.
Can the 1N5809US be used in parallel for higher current handling?
Parallel operation of 1N5809US devices is not recommended without individual ballast resistors. Schottky diodes exhibit negative temperature coefficient VF behavior, leading to current hogging and thermal runaway. For >3A applications, select a single higher-rated part such as the 1N5822 (10A) instead.
1N5809US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SQ-MELF
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 100 V
- Current - Average Rectified (Io):
- 6A
- Voltage - Forward (Vf) (Max) @ If:
- 875 mV @ 4 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 30 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 100 V
- Capacitance @ Vr, F:
- 60pF @ 5V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -
1N5809US FAQ
1.How can I place an order for 1N5809US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5809US 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 1N5809US reliable?
The price and inventory of 1N5809US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5809US is usually 5 days.
3.What payment methods are accepted for 1N5809US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5809US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5809US?
1N5809US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5809US 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 1N5809US?
For technical support, including 1N5809US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5809US requirements.
6.How does Aetrix verify that 1N5809US is sourced from the original manufacturer or authorized distributors?
All 1N5809US 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 1N5809US meets industry standards.
7.What is the process for return or replacement of 1N5809US?
All 1N5809US units undergo pre-shipment inspection (PSI). If there is an issue with 1N5809US, 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 1N5809US part is unused and in its original packaging.
Return procedure for 1N5809US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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