LC30 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The LC30 is an active Microchip Technology transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This unidirectional zener-type device operates through a DO-13 (DO-202AA) through-hole package and provides peak pulse power dissipation of 1500W with a 30V reverse standoff voltage and 53.5V maximum clamping voltage.

The LC30 remains in active product status with 755 units currently in stock. Equivalent and substitute parts are identified based on functional compatibility within the transient voltage suppression category, where alternative devices must satisfy the electrical performance requirements and mechanical constraints of the original application.

Substiute Parts

LC30

Microchip TechnologyIn Stock: 778LC30 Datasheet

Current PartRFQ

LCE28A

Littelfuse Inc.In Stock: 2122LCE28A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC30 is determined by electrical and mechanical compatibility within the transient voltage suppression category. The primary substitution candidate is the LCE28A from Littelfuse Inc., which operates as a unidirectional zener-type TVS diode in the same functional class.

Substitution eligibility is based on the following criteria:

• Voltage Rating Compatibility: Reverse standoff voltage and breakdown voltage must be within acceptable tolerance for the protected circuit
• Peak Pulse Current Capacity: The substitute must equal or exceed the peak pulse current requirement
• Peak Pulse Power Dissipation: The substitute must equal or exceed the power handling capability
• Operating Temperature Range: The substitute must cover the required temperature envelope
• Mounting Configuration: Through-hole mounting type and compatible package footprint
• Device Type: Unidirectional zener-type TVS diode classification

The LCE28A satisfies these criteria with a 28V reverse standoff voltage, 33A peak pulse current capacity, and 1500W peak pulse power rating, all within a through-hole DO-201 package configuration.

Parameter Comparison

Engineering Selection Recommendations

LC30 (Microchip Technology)

The LC30 remains the primary component choice for applications requiring a 30V reverse standoff voltage with 53.5V clamping performance. This device is active in production with established supply availability (755 units in stock). The LC30 is RoHS non-compliant and operates across the full temperature range of -65°C to 175°C, suitable for industrial and extended-temperature applications.

LCE28A (Littelfuse Inc.)

The LCE28A serves as an electrical substitute where a 28V reverse standoff voltage and 45.5V clamping voltage are acceptable for the circuit design. This device offers superior peak pulse current capacity (33A versus 28A) and maintains the same 1500W peak pulse power rating. The LCE28A is ROHS3 compliant, providing regulatory advantage in applications subject to RoHS requirements. The minimum operating temperature of -55°C (versus -65°C for the LC30) may limit use in extreme cold environments. Package compatibility requires mechanical verification due to differences between DO-13 and DO-201 footprints.

Selection between these devices depends on voltage tolerance requirements, regulatory compliance mandates, and thermal operating envelope specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can the LCE28A directly replace the LC30 in existing circuit board layouts?

A: Direct PCB replacement requires mechanical compatibility verification. The LC30 uses a DO-13 (DO-202AA) package, while the LCE28A is available in DO-201, DO-27, and axial configurations. Physical footprint differences may necessitate board redesign or component repositioning. Electrical substitution is feasible if the 28V standoff voltage and 45.5V clamping voltage are within circuit tolerance.

Q: What is the voltage difference impact between the LC30 (30V standoff) and LCE28A (28V standoff)?

A: The 2V difference in reverse standoff voltage represents a 6.7% reduction. The LCE28A will begin conducting at a lower overvoltage threshold. Circuit designs must confirm that the lower standoff voltage does not trigger false protection events during normal operation and that the 45.5V clamping voltage (versus 53.5V) remains within downstream component voltage ratings.

Q: Does the LCE28A's higher peak pulse current (33A versus 28A) provide any advantage?

A: The LCE28A's 33A peak pulse current capacity exceeds the LC30's 28A specification. Both devices share identical 1500W peak pulse power dissipation. The higher current capacity provides additional margin for transient events but does not increase overall power handling. Selection should prioritize the voltage parameters most critical to circuit protection requirements.

Q: What is the significance of the LCE28A's ROHS3 compliance versus the LC30's non-compliance?

A: ROHS3 compliance indicates the LCE28A meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. Applications subject to EU regulations, automotive standards, or customer-mandated environmental requirements must use ROHS3-compliant components. The LC30's non-compliance status restricts use in regulated markets but does not affect electrical performance in unrestricted applications.

Q: Are there temperature range limitations when substituting the LCE28A for the LC30?

A: The LCE28A operates from -55°C to 175°C, while the LC30 operates from -65°C to 175°C. The LCE28A cannot be used in applications requiring operation below -55°C. Applications limited to -55°C and above may use the LCE28A without thermal constraint. Extreme cold environment applications must retain the LC30.

Q: What packaging format should be selected for the LCE28A?

A: The LCE28A is available in three package configurations: DO-201, DO-27, and axial. Selection depends on circuit board layout and assembly process. DO-201 and DO-27 are through-hole packages suitable for wave soldering or manual insertion. Axial configuration is standard for breadboard prototyping and manual assembly. Verify footprint compatibility with existing PCB designs before component procurement.