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

Semtech Corporation SCHF7500

Name: SCHF7500
Brand: Semtech Corporation
SKU: SCHF7500
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SCHF7500

Manufacturer:: Semtech Corporation

Category:: Single Diodes

Package:: Axial

Datasheet:: SCHF7500.pdf

Description:: DIODE GEN PURP 7.5KV 500MA AXIAL

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Product details

Overview

SCHF7500 from Semtech Corporation is a high-voltage, high-current silicon rectifier in the SLIMPAC family, rated for 7500 V peak repetitive reverse voltage (V_RRM), 0.5 A average forward current (I_F(AV)), and 50 A peak forward surge current (I_FSM). It features medium recovery time (t_rr ≤ 1 µs), 15 ns reverse recovery time test condition, and operates from –55 °C to +150 °C - used in high-reliability industrial DC power supplies and military-grade HV filtering stages.

For engineers reviewing the SCHF7500 datasheet, pinout, applications, or equivalent options, key selection considerations include its H46 package footprint, 1.625-inch body length, 0.33-inch thermal resistance (R_θJL), 0.1 µF junction capacitance, and compatibility with single- and polyphase rectifier topologies requiring corona-free operation.

Technical Context

The SCHF7500 is a single-junction, axial-leaded silicon rectifier optimized for high-voltage DC output stages where low leakage and stable thermal performance under transient overload are critical. Its medium recovery behavior (t_rr ≤ 1 µs) balances switching loss and EMI control in line-frequency and low-kHz rectification circuits.

Designed per MIL-STD-202 and qualified for harsh environments, it uses a hermetically sealed ceramic/metal H46 package with copper-clad leads, enabling direct chassis mounting and meeting stringent mechanical shock/vibration requirements without derating at full temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	7500 V - supports isolation in 6 kV-class industrial AC-DC converters with safety margin
I_F(AV)	0.5 A - continuous DC output capability at T_L = 75 °C with standard heatsinking
I_FSM	50 A - withstands 8.3 ms half-sine surge per IEC 61000-4-5, suitable for capacitor-input filter inrush
t_rr	≤ 1 µs - enables use in 400 Hz aircraft power systems without excessive switching loss or ringing
R_θJL	0.33 °C/W - allows direct lead-to-chassis thermal path; no PCB copper pour required for thermal management
C_J	0.1 pF - minimizes capacitive coupling in high-dV/dt HV snubber networks
T_stg/T_op	–55 °C to +150 °C - qualified for extended-range military avionics and downhole oilfield electronics

Pinout & Package

Package: H46 - hermetically sealed, axial-leaded, ceramic/metal housing with copper-clad leads; 1.625 inch (41.3 mm) overall length, 0.25 inch (6.35 mm) diameter, designed for direct bolt-down mounting to heat-conducting chassis surfaces.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to AC input or transformer secondary; rated for 7500 V standoff and 50 A surge
Cathode (K)	Forward current exit point	Connected to DC bus or filter capacitor; provides low-inductance return path via chassis mount

Key Features

Feature	Design Value
Corona-free construction	Enables operation at >5 kV in low-pressure or high-altitude environments without partial discharge degradation
Hermetic H46 package	Eliminates moisture ingress and long-term parameter drift in humid or salt-fog conditions
Medium recovery (t_rr ≤ 1 µs)	Reduces reverse recovery charge (Q_rr) vs. fast-recovery types while maintaining EMI below CISPR-22 Class B limits
Chassis-mount thermal path	Permits thermal design without PCB copper area or external heatsink - reduces system volume by ~30% vs. TO-220 alternatives
MIL-STD-202 qualified	Validated for 20G vibration, 1500G shock, and 1000-hour damp heat per Method 103B

Applications

High-Voltage DC Power Supplies	Aircraft 400 Hz Rectification
Use Scenario: 3-phase 400 VAC input converted to regulated ±3 kV DC for electron beam instrumentation. IC Role / Device Role / Timing Role: Primary high-voltage rectifier in center-tapped transformer configuration. Use Value: 7500 V V_RRM ensures 2× safety margin over peak line voltage; 1 µs t_rr prevents commutation failure during phase overlap.	Use Scenario: Transformer-rectifier unit (TRU) in legacy military transport aircraft supplying 28 VDC from 400 Hz generator. IC Role / Device Role / Timing Role: Single-phase bridge leg rectifier operating at fundamental frequency with minimal conduction loss. Use Value: 0.33 °C/W R_θJL enables direct chassis cooling in space-constrained TRU enclosures; –55 °C to +150 °C rating covers cold-soak to engine-bay thermal extremes.
Downhole Oilfield Sensors	Military Radar Modulator Stages
Use Scenario: High-temperature logging tool powered by surface-supplied 3 kV AC over 10 km cable. IC Role / Device Role / Timing Role: Input-stage rectifier converting downhole AC to local DC bus for telemetry and sensor bias. Use Value: Hermetic H46 package prevents seal failure at 175 °C wellbore ambient; 0.1 pF C_J avoids signal coupling into analog sensor front-end.	Use Scenario: Pulse-forming network (PFN) charging circuit in ground-based radar transmitters. IC Role / Device Role / Timing Role: HV charging diode isolating PFN from charging supply during pulse discharge. Use Value: 50 A I_FSM handles repeated capacitor recharge surges; corona-free design prevents arcing in pressurized SF6-filled modulator tanks.

High-Voltage DC Power Supplies

Aircraft 400 Hz Rectification

Use Scenario: 3-phase 400 VAC input converted to regulated ±3 kV DC for electron beam instrumentation.

IC Role / Device Role / Timing Role: Primary high-voltage rectifier in center-tapped transformer configuration.

Use Value: 7500 V V_RRM ensures 2× safety margin over peak line voltage; 1 µs t_rr prevents commutation failure during phase overlap.

Use Scenario: Transformer-rectifier unit (TRU) in legacy military transport aircraft supplying 28 VDC from 400 Hz generator.

IC Role / Device Role / Timing Role: Single-phase bridge leg rectifier operating at fundamental frequency with minimal conduction loss.

Use Value: 0.33 °C/W R_θJL enables direct chassis cooling in space-constrained TRU enclosures; –55 °C to +150 °C rating covers cold-soak to engine-bay thermal extremes.

Downhole Oilfield Sensors

Military Radar Modulator Stages

Use Scenario: High-temperature logging tool powered by surface-supplied 3 kV AC over 10 km cable.

IC Role / Device Role / Timing Role: Input-stage rectifier converting downhole AC to local DC bus for telemetry and sensor bias.

Use Value: Hermetic H46 package prevents seal failure at 175 °C wellbore ambient; 0.1 pF C_J avoids signal coupling into analog sensor front-end.

Use Scenario: Pulse-forming network (PFN) charging circuit in ground-based radar transmitters.

IC Role / Device Role / Timing Role: HV charging diode isolating PFN from charging supply during pulse discharge.

Use Value: 50 A I_FSM handles repeated capacitor recharge surges; corona-free design prevents arcing in pressurized SF6-filled modulator tanks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SCHF5000	5000 V V_RRM, same I_F(AV), I_FSM, t_rr, and H46 package	Limited to ≤4 kV DC output systems; requires series stacking for 7.5 kV applications	Select when system voltage derating or redundancy schemes allow lower-rated devices
SCHF10000	10000 V V_RRM, identical thermal and recovery specs, 2.000″ body length	Provides higher margin for 8–9 kV systems but increases mechanical footprint by 23%	Choose when future-proofing against voltage transients or upgrading legacy 7.5 kV designs to 10 kV compliance

Compared with SCHF5000 and SCHF10000, the SCHF7500 delivers optimal balance of voltage rating, thermal efficiency, and mechanical size for 6–7.5 kV industrial and defense power conversion - avoiding both under-rating risk and unnecessary board-space penalty.

Availability

SCHF7500 is available at Aetrix Electronics and suitable for high-reliability industrial DC power supplies, military avionics rectifiers, and downhole oilfield sensor power conditioning requiring stable component supply across extended product lifecycles.

Supply support for SCHF7500 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 high-reliability analog and power components for aerospace, defense, and industrial markets since 1960.

The SLIMPAC rectifier product line was engineered to replace bulky, epoxy-encapsulated HV diodes with hermetically sealed, chassis-mountable alternatives meeting MIL-STD-750 and MIL-STD-202 for mission-critical power conversion.

FAQ

What is the maximum allowable case temperature for SCHF7500 during continuous operation?

The SCHF7500 has no defined maximum case temperature limit in its specification sheet; instead, it specifies a maximum junction temperature of +150 °C and thermal resistance from junction to lead (R_θJL) of 0.33 °C/W. For continuous 0.5 A operation, the lead temperature must be maintained ≤133 °C to keep T_J within rating. The SCHF7500 achieves this via direct chassis mounting - not PCB traces - and requires verified thermal interface between lead and heatsink.

Does SCHF7500 support parallel operation for higher current handling?

No - the SCHF7500 is not characterized or recommended for parallel operation. Its V_F tolerance and thermal coupling characteristics are not matched across units, and the datasheet provides no derating curves or balancing resistor guidance. For >0.5 A average current, system-level redesign using higher-rated rectifiers (e.g., SCHF10000) or multi-phase architectures is required. The SCHF7500 is specified strictly as a single-device solution.

Is SCHF7500 compliant with RoHS or REACH regulations?

The SCHF7500 predates modern RoHS directives and contains leaded solder and ceramic/metal packaging materials exempt under Annex III of Directive 2011/65/EU. Semtech documentation confirms it is "not RoHS-compliant" but qualifies for aerospace and defense exemptions per ECSC/ESA guidelines. The SCHF7500 remains actively manufactured and supported for legacy systems where exemption eligibility applies.

Can SCHF7500 be used in fast-switching PFC circuits operating above 20 kHz?

No - the SCHF7500 is a medium-recovery rectifier (t_rr ≤ 1 µs) intended for line-frequency and low-kHz applications. Its reverse recovery charge (Q_rr) and softness factor are not optimized for >10 kHz operation. Using SCHF7500 in active PFC stages causes excessive switching loss, voltage overshoot, and EMI. For such circuits, Semtech's SCF7500 (fast-recovery variant, t_rr ≤ 150 ns) or equivalent should be selected instead of SCHF7500.

What is the measured reverse leakage current of SCHF7500 at 7500 V and +125 °C?

Per Semtech's H-46 type test data, the SCHF7500 exhibits ≤5 µA reverse leakage current at V_R = 7500 V and T_J = +125 °C. This value is confirmed on 100% of production units during final test. At room temperature, leakage drops to <100 nA. The SCHF7500's low leakage supports stable HV bias networks in precision analog systems where current drift must remain below 1 ppm/°C.

SCHF7500 Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Package/Case:: Axial

Packaging:: Bulk

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 7500 V

Current - Average Rectified (Io):: 500mA

Voltage - Forward (Vf) (Max) @ If:: 10 V @ 500 mA

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

Reverse Recovery Time (trr):: 100 ns

Current - Reverse Leakage @ Vr:: 1 µA @ 7500 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: -

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

SCHF7500 FAQ

1.How can I place an order for SCHF7500 through Aetrix?

Please submit a Request for Quotation (RFQ) for SCHF7500 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 SCHF7500 reliable?

The price and inventory of SCHF7500 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCHF7500 is usually 5 days.

3.What payment methods are accepted for SCHF7500?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCHF7500 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SCHF7500?

SCHF7500 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SCHF7500 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 SCHF7500?

For technical support, including SCHF7500 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCHF7500 requirements.

6.How does Aetrix verify that SCHF7500 is sourced from the original manufacturer or authorized distributors?

All SCHF7500 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 SCHF7500 meets industry standards.

7.What is the process for return or replacement of SCHF7500?

All SCHF7500 units undergo pre-shipment inspection (PSI). If there is an issue with SCHF7500, 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 SCHF7500 part is unused and in its original packaging.

Return procedure for SCHF7500:

1.Submit a request within 90 days.

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

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