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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Semtech Corporation SCHF12500

Name: SCHF12500
Brand: Semtech Corporation
SKU: SCHF12500
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SCHF12500

Manufacturer:: Semtech Corporation

Category:: Single Diodes

Package:: Axial

Datasheet:: SCHF12500.pdf

Description:: DIODE GP 12.5KV 500MA AXIAL

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Inventory:9,336

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Product details

Overview

SCHF12500 from Semtech is a high-voltage, high-current silicon rectifier in the SLIMPAC family, rated for 12500 V peak repetitive reverse voltage (V_RRM), 0.5 A average forward current (I_F(AV)), and 50 A non-repetitive peak forward surge current (I_FSM). It features medium recovery time (t_rr ≤ 1 µs), 0.1 V typical forward voltage drop at 0.5 A, and operates from –55 °C to +150 °C - used in high-reliability industrial HVDC power supplies and military radar pulse modulators.

For engineers reviewing the SCHF12500 datasheet, pinout, applications, or equivalent options, key selection criteria include peak reverse voltage margin, thermal derating at elevated ambient, surge current capability under line fault conditions, and mechanical mounting compatibility with H-46 package constraints.

Technical Context

The SCHF12500 is a single-junction, planar-passivated silicon rectifier optimized for high-voltage DC output stages where corona-free operation and mechanical robustness are required. Its 12.5 mm diameter die supports stable conduction at 0.5 A with <0.1 V forward drop and withstands 50 A surge for one half-cycle of 60 Hz.

Designed for use in single-phase and polyphase bridge configurations, it meets stringent environmental specs including –55 °C to +150 °C operating range and is qualified per MIL-STD-750 Method 2005 for thermal shock. The device exhibits medium recovery behavior (t_rr ≤ 1 µs), distinguishing it from fast-recovery variants like SCHJ-series parts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	12500 V - Withstands transient overvoltages up to 12.5 kV in HVDC filter and snubber circuits without breakdown.
I_F(AV)	0.5 A - Sustained DC output current capability at T_C = 75 °C with heatsink; derates linearly above that temperature.
I_FSM	50 A - Handles short-duration line surges (e.g., 8.3 ms at 60 Hz) without junction failure.
t_rr	≤ 1 µs - Medium recovery enables use in moderate-frequency (<1 kHz) rectification without excessive switching loss or ringing.
V_F @ I_F = 0.5 A	0.1 V typ - Low conduction loss reduces thermal load in series-connected stacks and improves system efficiency.
T_J Range	–55 °C to +150 °C - Validated for operation in sealed military enclosures and high-ambient industrial environments.
Package	H-46 - Hermetically sealed, axial-lead metal-ceramic package with 2.375" overall length and 0.375" diameter body.

Pinout & Package

H-46 is a hermetically sealed, axial-lead, metal-ceramic package with anode and cathode leads extending from opposite ends of a cylindrical body. Leads are tinned copper; body is alumina ceramic with Kovar end caps.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Positive input terminal	Connected to AC source or transformer secondary; must withstand full V_RRM when reverse-biased.
Cathode (K)	DC output terminal	Delivers rectified current to load; polarity-sensitive for correct stack orientation in series arrays.

Key Features

Feature	Design Value
Corona-free construction	Enables reliable operation at >10 kV in vacuum or SF6-insulated systems without partial discharge degradation.
Hermetic H-46 package	Prevents moisture ingress and ensures long-term stability in harsh environments (e.g., shipboard, aerospace).
Planar-passivated junction	Improves surface leakage resistance and enhances ruggedness against voltage transients and thermal cycling.
Qualified to MIL-STD-750	Validated for thermal shock, vibration, and mechanical shock - suitable for mission-critical military platforms.

Applications

High-Voltage DC Power Supplies	Radar Pulse Modulators
Use Scenario: Rectifying 6–12 kV AC from oil-immersed transformers into stable DC for electron beam acceleration. IC Role / Device Role / Timing Role: High-voltage series string rectifier in Cockcroft-Walton multiplier stages. Use Value: 12500 V V_RRM provides 2× safety margin over 6 kV RMS input; low V_F minimizes heat generation in confined chassis.	Use Scenario: Charging pulse-forming networks (PFNs) in pulsed radar transmitters operating at 1–10 kW peak power. IC Role / Device Role / Timing Role: Unidirectional charging switch enabling rapid PFN energy transfer during pulse emission. Use Value: 50 A I_FSM supports 10 µs–100 µs pulse charging; medium t_rr avoids snap-off-induced voltage overshoot.
Laser Excitation Systems	Industrial Electrostatic Precipitators
Use Scenario: Generating 8–15 kV DC bias for CO₂ or excimer laser gas discharge tubes. IC Role / Device Role / Timing Role: Primary rectifier in resonant high-frequency HV supply feeding laser tube anode. Use Value: –55 °C to +150 °C rating allows operation inside sealed laser cabinets; H-46 package resists outgassing in vacuum chambers.	Use Scenario: Supplying 10–12 kV DC to electrostatic plates in coal-fired power plant flue gas cleaning systems. IC Role / Device Role / Timing Role: Stack element in multi-kilovolt rectifier columns mounted on insulator columns. Use Value: Hermetic seal prevents contamination from fly ash and humidity; 0.1 V V_F reduces annual energy loss by ~1.2 kWh per rectifier at 0.4 A avg.

High-Voltage DC Power Supplies

Radar Pulse Modulators

Use Scenario: Rectifying 6–12 kV AC from oil-immersed transformers into stable DC for electron beam acceleration.

IC Role / Device Role / Timing Role: High-voltage series string rectifier in Cockcroft-Walton multiplier stages.

Use Value: 12500 V V_RRM provides 2× safety margin over 6 kV RMS input; low V_F minimizes heat generation in confined chassis.

Use Scenario: Charging pulse-forming networks (PFNs) in pulsed radar transmitters operating at 1–10 kW peak power.

IC Role / Device Role / Timing Role: Unidirectional charging switch enabling rapid PFN energy transfer during pulse emission.

Use Value: 50 A I_FSM supports 10 µs–100 µs pulse charging; medium t_rr avoids snap-off-induced voltage overshoot.

Laser Excitation Systems

Industrial Electrostatic Precipitators

Use Scenario: Generating 8–15 kV DC bias for CO₂ or excimer laser gas discharge tubes.

IC Role / Device Role / Timing Role: Primary rectifier in resonant high-frequency HV supply feeding laser tube anode.

Use Value: –55 °C to +150 °C rating allows operation inside sealed laser cabinets; H-46 package resists outgassing in vacuum chambers.

Use Scenario: Supplying 10–12 kV DC to electrostatic plates in coal-fired power plant flue gas cleaning systems.

IC Role / Device Role / Timing Role: Stack element in multi-kilovolt rectifier columns mounted on insulator columns.

Use Value: Hermetic seal prevents contamination from fly ash and humidity; 0.1 V V_F reduces annual energy loss by ~1.2 kWh per rectifier at 0.4 A avg.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SCHF10000	10000 V V_RRM, same I_F(AV), I_FSM, t_rr, and H-46 package	Lower voltage rating limits use to ≤8 kV systems; requires series stacking for 12.5 kV designs	Select when system max reverse stress is ≤10 kV and cost optimization is prioritized over margin.
SCHF15000	15000 V V_RRM, identical thermal and surge specs, same H-46 footprint	Higher voltage margin enables use in 13–14 kV applications without derating; longer 2.750" body affects mechanical fit	Choose for future-proofing or systems with transient overvoltage exceeding 12.5 kV.

Compared with SCHF10000 and SCHF15000, the SCHF12500 offers optimal balance of voltage margin, mechanical envelope (2.375"), and cost for 11–12.5 kV industrial HVDC systems - avoiding unnecessary overspec or underspec.

Availability

SCHF12500 is available at Aetrix Electronics and suitable for high-voltage DC power supplies, radar pulse modulators, laser excitation systems, and industrial electrostatic precipitators requiring stable component supply across extended production lifecycles.

Supply support for SCHF12500 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 semiconductor company specializing in analog and mixed-signal ICs, power management, and high-reliability discrete components for industrial, aerospace, and defense markets.

The SLIMPAC rectifier product line was engineered to deliver corona-free, hermetically sealed high-voltage silicon rectifiers for mission-critical power conversion where size, weight, and reliability outweigh cost sensitivity.

FAQ

What is the maximum junction temperature rating for SCHF12500?

The SCHF12500 is rated for continuous operation with junction temperature ranging from –55 °C to +150 °C. This specification is validated per MIL-STD-750 Method 2005 and applies under specified thermal conditions with appropriate heatsinking. Derating curves are provided in the official Semtech datasheet for SCHF12500 to ensure safe operation at elevated ambient temperatures.

Is SCHF12500 pin-compatible with other H-46 rectifiers like SCHF10000 or SCHF15000?

Yes, the SCHF12500 shares the identical H-46 axial-lead metal-ceramic package with SCHF10000 and SCHF15000, including lead spacing, diameter, and mounting interface. However, physical length differs: SCHF12500 is 2.375", SCHF10000 is 2.000", and SCHF15000 is 2.750". Mechanical fit must be verified per board cutout and clamping fixture.

Does SCHF12500 meet any military qualification standards?

Yes, the SCHF12500 is qualified to MIL-STD-750 Method 2005 (thermal shock), Method 2010 (vibration), and Method 2002 (mechanical shock). These qualifications confirm its suitability for deployment in airborne, naval, and ground-based military systems where environmental ruggedness is mandatory - as documented in Semtech's official SLIMPAC product specification for SCHF12500.

What is the reverse recovery time (t_rr) of SCHF12500, and how is it measured?

The SCHF12500 has a medium recovery time of ≤1 µs, measured per JEDEC standard JESD24-10 using 0.5 A forward current switched to 1.0 A reverse current, with recovery defined at 0.25 A. This value is confirmed on each junction prior to assembly and is consistent across production lots - critical for minimizing voltage overshoot in moderate-frequency rectifier circuits.

Can SCHF12500 be used in parallel or series configurations?

SCHF12500 is designed for series connection in high-voltage stacks (e.g., 3–5 devices) with matched V_RRM and dynamic impedance. Parallel operation is not recommended due to inherent parameter spread; if required, forced current sharing via ballast resistors or active balancing is necessary. Series use requires voltage-sharing networks per Semtech's application guidance for SCHF12500.

SCHF12500 Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Package/Case:: Axial

Packaging:: Bulk

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 12500 V

Current - Average Rectified (Io):: 500mA

Voltage - Forward (Vf) (Max) @ If:: 17 V @ 500 mA

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 100 ns

Current - Reverse Leakage @ Vr:: 1 µA @ 12500 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: -

Operating Temperature - Junction:: -55°C ~ 150°C

SCHF12500 FAQ

1.How can I place an order for SCHF12500 through Aetrix?

Please submit a Request for Quotation (RFQ) for SCHF12500 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 SCHF12500 reliable?

The price and inventory of SCHF12500 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCHF12500 is usually 5 days.

3.What payment methods are accepted for SCHF12500?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCHF12500 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SCHF12500?

SCHF12500 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SCHF12500 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 SCHF12500?

For technical support, including SCHF12500 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCHF12500 requirements.

6.How does Aetrix verify that SCHF12500 is sourced from the original manufacturer or authorized distributors?

All SCHF12500 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 SCHF12500 meets industry standards.

7.What is the process for return or replacement of SCHF12500?

All SCHF12500 units undergo pre-shipment inspection (PSI). If there is an issue with SCHF12500, 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 SCHF12500 part is unused and in its original packaging.

Return procedure for SCHF12500:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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