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Microchip Technology DSB3A20
- Part No.:
- DSB3A20
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
DSB3A20.pdf
- Description:
- DIODE SCHOTTKY 20V 3A DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:8,989
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Product details
Overview
DSB3A20 from Microsemi is a hermetically sealed 3 A Schottky barrier rectifier with 20 V reverse voltage rating, 0.40 V forward voltage at 1.0 A, 0.50 V at 3.0 A, and 0.70 V at 9.4 A, designed for high-efficiency DC/DC conversion in military-grade power supplies.
For engineers reviewing the DSB3A20 datasheet, DSB3A20 pinout, DSB3A20 application, or DSB3A20 equivalent, key selection criteria include its MIL-PRF-19500/620 compliance, -65°C to +125°C operating temperature range, 30°C/W junction-to-ambient thermal resistance at 3/8″ lead length, and cathode-banded polarity marking.
Technical Context
The DSB3A20 implements a metallurgically bonded Schottky junction in a hermetically sealed "B" body package per MIL-PRF-19500/620 Class JX, enabling operation up to +125°C junction temperature with no thermal runaway risk. Its low forward voltage minimizes conduction loss in high-frequency switching topologies.
Rated for 3.0 A average rectified forward current at TL = +55°C with 3/8″ lead length, the DSB3A20 derates linearly at 43 mA/°C above that temperature. Reverse leakage remains ≤0.10 mA at +25°C and ≤12.5 mA at +100°C under rated VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VRWM) | 20 V - Maximum continuous reverse blocking capability without breakdown |
| Forward Voltage (VF @ 1.0 A) | 0.40 V - Low conduction loss enabling >92% efficiency in 5 V output converters |
| Forward Voltage (VF @ 3.0 A) | 0.50 V - Maintains low loss at full rated DC current |
| Average Forward Current (IF(AV)) | 3.0 A @ TL = +55°C, L = 3/8″ - Sustained DC output capability with defined thermal mounting condition |
| Reverse Leakage (IR @ +25°C) | ≤0.10 mA - Minimal standby power loss in hold-up or standby circuits |
| Junction-to-Ambient RθJA | 30°C/W max @ L = 0.375″ - Enables thermal design with standard PCB copper pour and lead length |
| Operating Temperature Range | -65°C to +125°C - Qualified for extended-range military and aerospace environments |
Pinout & Package
Package: Hermetically sealed "B" body per MIL-PRF-19500/620, copper-clad steel leads with tin/lead finish, cathode end marked by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction | Connected to unregulated input rail; accepts pulsed or DC current up to 9.4 A peak |
| Cathode | Output terminal for forward conduction | Banded end; delivers regulated DC output; must be routed with low-inductance path to minimize switching noise |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/620 qualification | Meets JX-level reliability and screening for defense electronics with traceable lot history |
| Hermetic sealing | Prevents moisture ingress and long-term parameter drift in humid or vacuum environments |
| Metallurgical bonding | Eliminates wirebond fatigue failure modes common in high-thermal-cycle applications |
| Low VF across load range | 0.40–0.70 V span from 1 A to 9.4 A enables stable efficiency across light-to-full load |
| Cathode band polarity marking | Unambiguous orientation identification during manual or automated assembly |
Applications
| Avionics Power Supply | Tactical Radio DC/DC Converter |
|---|---|
Use Scenario: Primary output rectification in 28 V input, 5 V/3 A regulated supply for flight control computers. IC Role / Device Role / Timing Role: Schottky rectifier handling continuous 3 A DC output with minimal voltage drop and thermal rise. Use Value: 0.50 V VF at 3.0 A reduces power dissipation to 1.5 W, easing heatsinking in constrained avionics enclosures. | Use Scenario: Output stage rectifier in portable HF/VHF transceiver power module operating from 12–16 V battery input. IC Role / Device Role / Timing Role: High-reliability rectifier delivering clean 3.3 V logic rail with low EMI due to soft recovery. Use Value: Hermetic seal ensures stable IR < 0.1 mA at +25°C, preserving battery life during multi-week standby. |
| Missile Seeker Power Module | Ground Vehicle Control Unit |
Use Scenario: Input rectification in shock/vibration-prone seeker electronics powered from vehicle bus with wide transient excursions. IC Role / Device Role / Timing Role: Robust Schottky diode surviving MIL-STD-810H mechanical stress while maintaining 20 V PIV margin. Use Value: -65°C to +125°C rating allows uninterrupted operation during rapid ambient shifts from arctic launch to desert flight. | Use Scenario: Auxiliary 24 V to 5 V converter in armored vehicle engine control unit exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Main rectifier in synchronous buck secondary side, leveraging low VF to reduce thermal load on shared heatsink. Use Value: 30°C/W RθJA enables direct lead-mounting without additional thermal interface material in space-constrained chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5822 | Same 20 V VRWM, 3 A IF(AV), identical VF and IR specs; non-hermetic epoxy package, commercial temperature range (-65°C to +125°C not guaranteed) | Lacks MIL-PRF-19500/620 qualification and hermetic seal; unsuitable for sealed modules or high-humidity deployments | Select 1N5822 only for cost-sensitive industrial prototypes where environmental ruggedness is secondary |
| DSB5820 | Identical electrical specs and hermetic "B" package; differs only in JAN/JANTXV screening level and lot traceability documentation | Qualified to higher reliability grades (JAN/JANTXV) with extended burn-in and radiation testing data available | Choose DSB5820 when full MIL-PRF-19500/620 JANTXV documentation and radiation tolerance evidence are contractually required |
Compared with 1N5822 and DSB5820, the DSB3A20 provides verified hermetic reliability at JX-level screening with full MIL-PRF-19500/620 compliance-making it optimal for deployed systems where field failure risk must be minimized without paying for JANTXV-level test overhead.
Availability
DSB3A20 is available at Aetrix Electronics and suitable for avionics power supplies, tactical radio converters, missile seeker modules, and ground vehicle control units requiring stable component supply with full military specification traceability.
Supply support for DSB3A20 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
Microsemi (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The DSB3A20 belongs to Microsemi's MIL-qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability DC/DC conversion in mission-critical power systems where hermetic integrity and temperature resilience are mandatory.
FAQ
What is the maximum junction temperature rating for the DSB3A20?
DSB3A20 is rated for a maximum junction temperature of +125°C, consistent with its MIL-PRF-19500/620 Class JX qualification. This rating is supported by its 30°C/W thermal resistance and validated through high-temperature life testing. The DSB3A20 maintains specified VF and IR performance within this limit, making it suitable for enclosed or high-ambient environments where thermal management is constrained.
Is the DSB3A20 pin-compatible with the 1N5822?
No-the DSB3A20 and 1N5822 share identical electrical specifications and anode/cathode terminal configuration, but they differ in package construction: DSB3A20 uses a hermetically sealed "B" body per MIL-PRF-19500/620, while 1N5822 uses a commercial epoxy package. Physical dimensions and lead finish (tin/lead vs. matte tin) are not interchangeable without requalification. DSB3A20 is not a drop-in replacement for 1N5822 in hermetic or screened applications.
Does the DSB3A20 require derating above +55°C ambient?
Yes-DSB3A20 must be derated at 43 mA/°C above TL = +55°C when mounted with 3/8″ lead length, per its Absolute Maximum Ratings table. At +85°C ambient, its usable average forward current reduces to approximately 2.3 A. This derating reflects measured thermal impedance (ZOJX = 3°C/W) and ensures junction temperature remains ≤+125°C under sustained load.
What does the cathode band indicate on the DSB3A20?
The cathode band on the DSB3A20 marks the cathode terminal, confirming polarity for correct installation in forward-biased rectification circuits. This marking is standardized per MIL-PRF-19500/620 and is visible as a distinct circumferential band near one end of the hermetically sealed "B" body. Misalignment risks reverse bias failure or circuit malfunction, so orientation must be verified before soldering the DSB3A20 into any board.
Can the DSB3A20 be used in surface-mount assemblies?
No-the DSB3A20 is a through-hole axial-leaded device in a hermetically sealed "B" metal-glass package, designed for lead-mounted or chassis-mounted installation with 3/8″ lead length. It lacks surface-mount terminations, footprint compatibility, or reflow profile qualification. Using DSB3A20 in SMT processes would compromise hermeticity and void MIL-PRF-19500/620 compliance. For SMT alternatives, consult Microsemi's surface-mount Schottky families separately.
DSB3A20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 30 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
- Operating Temperature - Junction:
- -65°C ~ 125°C
DSB3A20 FAQ
1.How can I place an order for DSB3A20 through Aetrix?
Please submit a Request for Quotation (RFQ) for DSB3A20 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 DSB3A20 reliable?
The price and inventory of DSB3A20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DSB3A20 is usually 5 days.
3.What payment methods are accepted for DSB3A20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DSB3A20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DSB3A20?
DSB3A20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DSB3A20 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 DSB3A20?
For technical support, including DSB3A20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DSB3A20 requirements.
6.How does Aetrix verify that DSB3A20 is sourced from the original manufacturer or authorized distributors?
All DSB3A20 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 DSB3A20 meets industry standards.
7.What is the process for return or replacement of DSB3A20?
All DSB3A20 units undergo pre-shipment inspection (PSI). If there is an issue with DSB3A20, 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 DSB3A20 part is unused and in its original packaging.
Return procedure for DSB3A20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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