1N6471 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 1N6471 is an axial-mounted Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose transient voltage protection applications. This unidirectional zener diode operates with a 12V reverse standoff voltage and provides peak pulse current handling of 374A at 8/20µs pulse duration. The component is classified as Active product status and is RoHS non-compliant. Substitute parts are identified when equivalent electrical performance parameters and through-hole mounting compatibility are maintained within the specified operating range.

Substiute Parts

1N6471

Microchip TechnologyIn Stock: 11201N6471 Datasheet

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LCE12A

LittelfuseIn Stock: 2277LCE12A Datasheet

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LCE14A

Littelfuse Inc.In Stock: 1645LCE14A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N6471 TVS diode is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 12V nominal operating point
• Voltage - Clamping (Max) @ Ipp: Range 19.9V to 23.2V acceptable
• Current - Peak Pulse: Minimum 65A required
• Power - Peak Pulse: 1500W (1.5kW) maintained
• Unidirectional Channels: 1 channel configuration
• Mounting Type: Through Hole axial or DO-201 package
• Operating Temperature Range: -55°C to 175°C (TJ)
• Type: Zener diode classification

Identified Substitute Parts:

The LCE12A (Littelfuse) maintains identical reverse standoff voltage (12V), clamping voltage (19.9V), and peak pulse power (1500W) with reduced peak pulse current (75A). This part is suitable for applications where the 374A peak pulse current of the 1N6471 exceeds system requirements.

The LCE14A (Littelfuse) operates at 14V reverse standoff voltage with 23.2V clamping voltage and 65A peak pulse current. This part is applicable in circuits where slightly elevated voltage protection thresholds are acceptable.

Both substitute parts feature through-hole mounting, active product status, and identical operating temperature range. Package differences (DO-201 vs. Axial G) require mechanical verification for PCB compatibility.

Parameter Comparison

Engineering Selection Recommendations

1N6471 (Microchip Technology) - Primary Selection

The 1N6471 remains the primary component choice when the specified 374A peak pulse current capacity is required for high-energy transient suppression. This part maintains Active product status and is suitable for applications where RoHS non-compliance is acceptable. The axial G package provides standard through-hole mounting compatibility.

LCE12A (Littelfuse) - Equivalent Voltage Protection

The LCE12A is selected when peak pulse current requirements are reduced to 75A or lower. This substitute maintains identical 12V reverse standoff voltage and 1500W peak pulse power rating. The LCE12A achieves ROHS3 compliance, providing environmental and regulatory advantages over the 1N6471. Package compatibility requires verification for DO-201 footprint acceptance on target PCBs.

LCE14A (Littelfuse) - Elevated Voltage Protection

The LCE14A is selected for circuits requiring 14V reverse standoff voltage protection with 65A peak pulse current capacity. This part is applicable when system voltage thresholds exceed the 12V specification of the 1N6471. ROHS3 compliance and Active product status align with modern manufacturing standards. DO-201 package compatibility must be confirmed for PCB integration.

Compliance Considerations

The 1N6471 is RoHS non-compliant, while both LCE12A and LCE14A achieve ROHS3 compliance. Selection between these alternatives depends on regulatory requirements and end-product environmental certifications. All three parts maintain identical operating temperature range (-55°C to 175°C TJ) and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can the LCE12A directly replace the 1N6471 in all applications?

A: The LCE12A maintains identical reverse standoff voltage (12V) and peak pulse power (1500W). However, peak pulse current is reduced from 374A to 75A. Direct substitution is valid only when circuit transient energy levels do not exceed 75A peak pulse current capacity. Package differences (DO-201 vs. Axial G) require mechanical verification for PCB footprint compatibility.

Q: What is the primary difference between the LCE12A and LCE14A substitutes?

A: The LCE12A operates at 12V reverse standoff voltage (matching the 1N6471), while the LCE14A operates at 14V. The LCE14A is selected for circuits requiring elevated voltage protection thresholds. Both parts share identical peak pulse power (1500W) and operating temperature range.

Q: Are the LCE12A and LCE14A RoHS compliant?

A: Both LCE12A and LCE14A achieve ROHS3 compliance, providing environmental advantages over the RoHS non-compliant 1N6471. This compliance status is relevant for products subject to RoHS regulations in target markets.

Q: How do package differences affect substitution?

A: The 1N6471 uses Axial G package, while LCE12A and LCE14A use DO-201AA/DO-27 package. Both are through-hole mounting types, but physical dimensions and PCB footprints differ. PCB layout verification is required before substitution to confirm mechanical compatibility.

Q: What is the significance of peak pulse current ratings in substitution?

A: Peak pulse current (374A for 1N6471, 75A for LCE12A, 65A for LCE14A) determines the maximum transient energy the diode can suppress. Selection must ensure the substitute part's peak pulse current meets or exceeds the circuit's maximum transient current requirement. Undersizing this parameter results in inadequate transient protection.

Q: Can the LCE14A be used in a 12V circuit?

A: The LCE14A operates at 14V reverse standoff voltage, which is higher than the 1N6471's 12V specification. Use in a 12V circuit is not recommended, as the elevated voltage threshold may allow transients to exceed circuit protection limits. The LCE12A is the appropriate substitute for 12V circuits.

Q: What inventory availability exists for these parts?

A: The 1N6471 has 1084 pieces in stock. The LCE12A has 2169 pieces available, and the LCE14A has 1623 pieces in stock. Availability should be confirmed with the supplier for production requirements.