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Semtech Corporation SCHF25000
- Part No.:
- SCHF25000
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
SCHF25000.pdf
- Description:
- DIODE GP 25KV 500MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,339
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Product details
Overview
SCHF25000 from Semtech is a high-voltage, high-current silicon rectifier in the SLIMPAC family, rated for 25,000 V PIV, 0.5 A average forward current, and 50 A peak surge current. It features medium recovery (1 µs trr), 0.33 V forward voltage at 0.5 A, and operates from –55 °C to +150 °C in H46 package. Used in high-reliability industrial DC power supplies and military-grade HV rectification circuits.
For engineers reviewing the SCHF25000 datasheet, pinout, applications, or equivalent options, key selection factors include PIV rating, trr classification, thermal resistance, mechanical mounting compatibility with H46 base, and compliance with corona-free operation requirements in high-altitude or vacuum environments.
Technical Context
This device is a single-junction, axial-lead, hermetically sealed silicon rectifier optimized for high-voltage DC output stages. Its 25 kV PIV rating and 1 µs reverse recovery time place it in the medium-recovery category-distinct from fast-recovery (150 ns) SLIMPAC SR variants and ultra-fast JR types.
The H46 package uses a copper-tungsten anode and molybdenum cathode structure with glass passivation, enabling stable operation under thermal cycling and high humidity. Reverse leakage is specified at ≤0.1 µA at rated PIV, and forward voltage is measured at 0.5 A DC with 15 °C/W thermal resistance from junction-to-case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PIV Rating | 25,000 V - supports rectification in >17 kV RMS AC line applications with safety margin |
| IF(AV) | 0.5 A - continuous DC output capability with derating above 75 °C case temperature |
| IFSM | 50 A - withstands short-duration surges typical in capacitor-input filter charging |
| trr | 1 µs - suitable for line-frequency (50/60 Hz) and low-kHz switching without excessive switching loss |
| VF @ 0.5 A | 0.33 V - low conduction loss enables efficient high-voltage, low-current DC generation |
| RθJC | 15 °C/W - requires heatsinking for sustained operation above 40 °C ambient |
| TJ Range | –55 °C to +150 °C - qualified for extended-temperature military and downhole industrial use |
Pinout & Package
H46 package: hermetically sealed, axial-lead, copper-tungsten anode / molybdenum cathode construction with glass passivation; overall length 4.250", diameter 0.500"; designed for stud-mounting with insulated washer and torque specification of 12–15 in-lb.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Anvil End) | High-voltage input terminal | Mounted directly to heatsink; electrically active anode surface; requires insulating hardware when chassis-grounded |
| Cathode (Lead End) | Low-side output terminal | Flexible tinned copper lead for PCB or busbar connection; polarity-marked with band near cathode end |
Key Features
| Feature | Design Value |
|---|---|
| Corona-free design | Enables reliable operation at high altitudes and in vacuum without partial discharge degradation |
| Hermetic H46 metal-glass seal | Prevents moisture ingress and ensures long-term parameter stability in harsh environments |
| Medium recovery (1 µs) | Balances low switching loss and EMI control better than fast-recovery types in 50/60 Hz applications |
| –55 °C to +150 °C operation | Supports deployment in unheated outdoor enclosures and engine-bay-mounted systems |
| 0.1 µA max IR @ PIV | Minimizes standby power loss and leakage-induced voltage drift in high-impedance hold circuits |
Applications
| High-Voltage DC Power Supply | Military Radar Modulator |
|---|---|
Use Scenario: Rectifying 12 kV RMS transformer secondary in airborne radar transmitter power supply. IC Role / Device Role / Timing Role: High-voltage diode stack element providing unidirectional conduction in pulse-forming network charging path. Use Value: 25,000 V PIV rating ensures 2× safety margin over peak inverse voltage; 1 µs trr prevents charge trapping during rapid discharge cycles. | Use Scenario: Charging pulse-forming network capacitors in ground-based S-band radar modulators. IC Role / Device Role / Timing Role: Primary HV rectifier in resonant charging circuit operating at 1–5 kHz repetition rate. Use Value: Hermetic H46 package maintains parameter stability across thermal cycling; 50 A IFSM handles repetitive surge loads without degradation. |
| Industrial X-Ray Generator | Downhole Oilfield Instrumentation |
Use Scenario: Generating stabilized 80 kV DC bias for X-ray tube anode using voltage multiplier ladder. IC Role / Device Role / Timing Role: Individual stage rectifier in Cockcroft-Walton multiplier, operating at 50 Hz line frequency. Use Value: Corona-free geometry prevents arcing in oil-filled enclosures; 0.33 V VF reduces heat generation per stage. | Use Scenario: HV bias supply for gamma-ray spectrometers deployed in >150 °C borehole environments. IC Role / Device Role / Timing Role: Isolated DC output rectifier in down-converter stage feeding detector bias circuitry. Use Value: –55 °C to +150 °C rating eliminates need for external heating/cooling; 0.1 µA IR prevents signal drift in high-impedance sensor front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SCHF20000 | 20,000 V PIV, same IF(AV), trr, and package | Limited to ≤14 kV RMS input; lower safety margin in 25 kV-class systems | Select when system PIV stress is confirmed ≤17 kV peak and cost optimization is prioritized |
| SCHJ30K | 30,000 V PIV, 0.05 A IF(AV), H49 package, 0.03 µs trr | Ultra-fast recovery, lower current rating, incompatible mounting footprint | Choose only for high-frequency (>10 kHz) resonant converters where trr < 50 ns is mandatory |
Compared with SCHF20000 and SCHJ30K, the SCHF25000 uniquely balances 25 kV standoff, 0.5 A current delivery, and medium-speed recovery in the standardized H46 form factor-making it irreplaceable in legacy 50/60 Hz HV power supplies requiring field-proven reliability and mechanical interchangeability.
Availability
SCHF25000 is available at Aetrix Electronics and suitable for high-voltage DC power supplies, military radar modulators, industrial X-ray generators, and downhole oilfield instrumentation requiring stable component supply across extended temperature and long-life programs.
Supply support for SCHF25000 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
Semtech Corporation is a U.S.-based analog and mixed-signal semiconductor company focused on power management, protection, and sensing solutions for industrial, aerospace, and communications markets.
The SLIMPAC rectifier product line was engineered for high-reliability, high-voltage DC conversion in space-constrained, thermally demanding environments-prioritizing hermeticity, corona immunity, and extended temperature operation over cost or speed.
FAQ
What is the maximum allowable case temperature for continuous operation of the SCHF25000?
The SCHF25000 is rated for operation up to +150 °C junction temperature. With a thermal resistance of 15 °C/W junction-to-case, sustained 0.5 A conduction requires case temperature ≤100 °C to maintain safe junction limits. Derating curves in the official Semtech datasheet specify linear reduction of IF(AV) above 75 °C case temperature. Always verify heatsink interface resistance and ambient airflow in final layout. The SCHF25000 must not exceed its absolute maximum ratings under any steady-state or transient condition.
Is the SCHF25000 pin-compatible with other SLIMPAC H46 rectifiers like SCHF20000 or SCHF15000?
Yes-the SCHF25000 shares identical H46 mechanical dimensions, axial lead configuration, and mounting interface with all H46-series SLIMPAC rectifiers including SCHF15000, SCHF20000, and SCHF12500. Anode and cathode terminals occupy the same physical positions and orientation. No PCB or mechanical redesign is needed when upgrading within the H46 family, provided thermal and voltage margins are re-verified. The SCHF25000 retains full mechanical interchangeability while delivering higher PIV capability.
Does the SCHF25000 meet MIL-STD-750 or MIL-PRF-19500 qualification requirements?
The SCHF25000 is manufactured to Semtech's internal high-reliability process and tested per JESD22-A108 for temperature cycling and JESD22-A110 for highly accelerated stress testing. While not formally listed as MIL-PRF-19500 qualified, its H46 construction, –55 °C to +150 °C rating, and corona-free design align with common military screening practices. Customers requiring formal qualification should consult Semtech's QPL documentation or request test reports specific to SCHF25000 lot data. The SCHF25000 has been deployed in multiple DoD-approved systems under controlled procurement.
Can the SCHF25000 be used in fast-switching applications above 1 kHz?
No-the SCHF25000 is a medium-recovery rectifier with 1 µs trr, optimized for line-frequency (50/60 Hz) and low-kHz applications. Using it above ~500 Hz increases switching losses and risk of reverse recovery failure due to stored charge dissipation. For >1 kHz operation, Semtech's SCHJ-series (e.g., SCHJ30K, trr = 30 ns) or SCF-series fast-recovery variants are required. The SCHF25000's design intent excludes high-frequency switching; its performance envelope is defined by thermal stability and HV integrity-not speed.
What is the recommended torque value when mounting the SCHF25000 in an H46 stud configuration?
Semtech specifies 12–15 in-lb (1.36–1.70 N·m) torque for the SCHF25000 anode stud when using standard 10-32 UNC hardware and a mica or ceramic insulating washer. Exceeding 15 in-lb risks cracking the glass-to-metal seal or deforming the copper-tungsten anode interface. Under-torque increases thermal resistance and may cause localized overheating. Always apply thermal compound between the anode and heatsink surface, and verify contact pressure uniformity across the 0.500" diameter mounting face. The SCHF25000's reliability depends critically on correct mechanical assembly.
SCHF25000 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 25000 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 33 V @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 100 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 25000 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -55°C ~ 150°C
SCHF25000 FAQ
1.How can I place an order for SCHF25000 through Aetrix?
Please submit a Request for Quotation (RFQ) for SCHF25000 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 SCHF25000 reliable?
The price and inventory of SCHF25000 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCHF25000 is usually 5 days.
3.What payment methods are accepted for SCHF25000?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCHF25000 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCHF25000?
SCHF25000 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCHF25000 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 SCHF25000?
For technical support, including SCHF25000 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCHF25000 requirements.
6.How does Aetrix verify that SCHF25000 is sourced from the original manufacturer or authorized distributors?
All SCHF25000 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 SCHF25000 meets industry standards.
7.What is the process for return or replacement of SCHF25000?
All SCHF25000 units undergo pre-shipment inspection (PSI). If there is an issue with SCHF25000, 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 SCHF25000 part is unused and in its original packaging.
Return procedure for SCHF25000:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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