Würth Elektronik 82532300 Varistor 47V 1.2kA 2220 - Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 82532300 is a 47 V, 1.2 kA varistor in MLCV 2220 (5750 Metric) surface mount package, designed for transient voltage suppression in single-circuit applications. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance requirements. Substitute parts must maintain identical electrical performance characteristics and package specifications to ensure direct replacement capability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	47 V
Varistor Voltage Range	42.3 V (Min) – 51.7 V (Max)
Current - Surge	1.2 kA
Energy Absorption	12 J
Maximum AC Voltage	30 V
Maximum DC Voltage	38 V
Operating Temperature Range	-40°C to 125°C
Package / Case	2220 (5750 Metric)
Mounting Type	Surface Mount, MLCV
Number of Circuits	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Würth Elektronik 82532300 is determined by strict equivalence across the following critical parameters:

Varistor Voltage Rating: Nominal 47 V with tolerance range 42.3 V to 51.7 V
Surge Current Capacity: 1.2 kA minimum
Energy Absorption: 12 J minimum
Package Specification: MLCV 2220 (5750 Metric) surface mount only
Number of Circuits: Single circuit configuration
Electrical Compliance: ROHS3 compliance and EAR99 classification

The EPCOS - TDK Electronics B72540V0300K062 meets all substitution criteria with identical electrical ratings and package specifications. This part is designated as a manufacturer-recommended substitute and maintains full functional equivalence for direct replacement applications.

Parameter Comparison

Parameter	Würth Elektronik 82532300	EPCOS B72540V0300K062	Compatibility
Varistor Voltage (Typ)	47 V	47 V	Identical
Varistor Voltage (Min)	42.3 V	42.3 V	Identical
Varistor Voltage (Max)	51.7 V	51.7 V	Identical
Current - Surge	1.2 kA	1.2 kA	Identical
Energy	12 J	12 J	Identical
Maximum AC Volts	30 V	30 V	Identical
Maximum DC Volts	38 V	38 V	Identical
Number of Circuits	1	1	Identical
Capacitance @ 1 kHz	5700 pF	4000 pF	Within tolerance
Operating Temperature Range	-40°C to 125°C	-55°C to 125°C	Substitute exceeds specification
Package / Case	2220 (5750 Metric)	2220 (5750 Metric)	Identical
Mounting Type	Surface Mount, MLCV	Surface Mount, MLCV	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Not For New Designs	Both restricted

Engineering Selection Recommendations

The EPCOS - TDK Electronics B72540V0300K062 is the manufacturer-recommended substitute for the obsolete Würth Elektronik 82532300. Both components are subject to product status restrictions; however, the EPCOS part remains available in production inventory (4117 units) compared to the Würth part's obsolete classification.

Selection of the EPCOS substitute is justified on the following basis:

Electrical Equivalence: All critical varistor parameters (voltage rating, surge current, energy absorption) are identical
Package Compatibility: Identical MLCV 2220 (5750 Metric) surface mount package ensures direct PCB placement without modification
Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 classification
Thermal Performance: The EPCOS substitute provides extended operating temperature range (-55°C to 125°C versus -40°C to 125°C), offering improved performance margin in low-temperature environments
Availability: Current production status and inventory availability support supply chain continuity

For applications requiring the obsolete Würth part, direct substitution with the EPCOS B72540V0300K062 is permissible without circuit redesign or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the EPCOS B72540V0300K062 be used as a direct replacement for the Würth Elektronik 82532300?

A: Yes. Both components share identical varistor voltage ratings (47 V nominal), surge current capacity (1.2 kA), energy absorption (12 J), and MLCV 2220 package specifications. Direct substitution is permissible without circuit modification.

Q: What is the significance of the capacitance difference (5700 pF versus 4000 pF)?

A: The capacitance variance falls within acceptable tolerance for varistor applications. Both values are specified at 1 kHz and do not affect the primary transient suppression function. Circuit performance remains equivalent.

Q: Why is the EPCOS part marked "Not For New Designs" if it is recommended as a substitute?

A: The product status designation reflects the manufacturer's long-term product roadmap. The part remains available and fully functional for replacement and maintenance applications. For new designs, consult the manufacturer for current-generation alternatives.

Q: Does the extended temperature range of the EPCOS part (-55°C to 125°C) provide any advantage?

A: The EPCOS substitute offers improved low-temperature performance margin. If the application operates below -40°C, the EPCOS part provides additional thermal headroom. For standard -40°C to 125°C applications, both parts perform identically.

Q: Are there any packaging or handling differences between these parts?

A: The EPCOS B72540V0300K062 is supplied in Cut Tape (CT) and Digi-Reel® packaging, while the Würth part packaging is not specified. Both use identical MLCV 2220 surface mount packages. Verify packaging format compatibility with your assembly process.

Q: What compliance certifications apply to both parts?

A: Both the Würth Elektronik 82532300 and EPCOS B72540V0300K062 are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. No additional compliance verification is required for substitution.

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