TMOV34S301M Equivalent & Substitute Parts

Part Overview

The TMOV34S301M is a 470 V, 40 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in the TMOV® 34S series. This component is designed for single-circuit overvoltage protection applications with a square 34mm form factor and through-hole mounting configuration. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new design implementations.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	470 V
Varistor Voltage Range	423 V – 517 V
Current - Surge	40 kA
Maximum AC Volts	300 V
Maximum DC Volts	400 V
Energy	590 J
Number of Circuits	1
Capacitance @ 1 MHz	4050 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Square 34mm, Formed Tabs, 3-Lead
Features	Thermally Protected

Substitute Part Grouping Explanation

Substitution of the TMOV34S301M is based on strict equivalence across all critical electrical and mechanical parameters. The allowed substitution criteria are:

Identical varistor voltage range (423 V – 517 V typical 470 V)
Identical surge current rating (40 kA)
Identical maximum AC and DC voltage ratings (300 V AC, 400 V DC)
Identical energy dissipation (590 J)
Identical number of circuits (1)
Identical capacitance specification (4050 pF @ 1 MHz)
Identical operating temperature range (-55°C to 85°C)
Identical mounting type and package configuration (Through Hole, Square 34mm, Formed Tabs, 3-Lead)
Identical thermal protection feature

Two active equivalent parts meet these criteria: TMOV34S301MP and TMOV34S301MPX2696. Both are manufactured by Littelfuse Inc. in the same TMOV® 34S series and maintain full parametric equivalence to the obsolete TMOV34S301M.

Parameter Comparison

Parameter	TMOV34S301M (Main)	TMOV34S301MP	TMOV34S301MPX2696
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Series	TMOV® 34S	TMOV® 34S	TMOV® 34S
Varistor Voltage (Typ)	470 V	470 V	470 V
Varistor Voltage Range	423 V – 517 V	423 V – 517 V	423 V – 517 V
Current - Surge	40 kA	40 kA	40 kA
Maximum AC Volts	300 V	300 V	300 V
Maximum DC Volts	400 V	400 V	400 V
Energy	590 J	590 J	590 J
Number of Circuits	1	1	1
Capacitance @ 1 MHz	4050 pF	4050 pF	4050 pF
Operating Temperature	-55°C to 85°C	-55°C to 85°C	-55°C to 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Square 34mm, Formed Tabs, 3-Lead	Square 34mm, Formed Tabs, 3-Lead	Square 34mm, Formed Tabs, 3-Lead
Features	Thermally Protected	Thermally Protected	Thermally Protected
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both TMOV34S301MP and TMOV34S301MPX2696 are direct functional equivalents to the obsolete TMOV34S301M. Selection between these two active alternatives should be based on the following factors:

Product Status: Both substitute parts carry Active product status, ensuring continued availability and manufacturing support from Littelfuse Inc.

Regulatory Compliance: Both TMOV34S301MP and TMOV34S301MPX2696 are ROHS3 Compliant, whereas the original TMOV34S301M is RoHS non-compliant. This compliance improvement is significant for applications subject to RoHS directives and environmental regulations.

REACH Status: Both substitute parts are REACH Unaffected, providing regulatory clarity for European market applications.

Packaging: TMOV34S301MP is supplied in Bulk packaging, while TMOV34S301MPX2696 is also supplied in Bulk packaging. Packaging selection should align with procurement and inventory management requirements.

Inventory Availability: Current stock levels are TMOV34S301MP (727 Pcs) and TMOV34S301MPX2696 (949 Pcs), both representing adequate supply for component sourcing.

For new designs and obsolescence replacement applications, either part provides equivalent electrical performance and mechanical compatibility with the original TMOV34S301M specification.

Frequently Asked Questions (FAQ)

Q: Can TMOV34S301MP and TMOV34S301MPX2696 be used interchangeably with TMOV34S301M?

A: Yes. Both parts are parametrically equivalent across all electrical specifications (varistor voltage, surge current, energy dissipation, capacitance, and operating temperature) and mechanical specifications (mounting type, package configuration, and form factor). Direct substitution is supported without circuit modification.

Q: What is the difference between TMOV34S301MP and TMOV34S301MPX2696?

A: Both parts are electrically and mechanically identical. The designation suffix "X2696" in TMOV34S301MPX2696 represents an internal Littelfuse manufacturing or distribution code. No functional or performance differences exist between these two part numbers.

Q: Why is the original TMOV34S301M listed as obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. The availability of active equivalents (TMOV34S301MP and TMOV34S301MPX2696) ensures continued system support and component sourcing without performance compromise.

Q: Are there any compliance differences between the original part and the substitutes?

A: Yes. The original TMOV34S301M is RoHS non-compliant, while both substitute parts (TMOV34S301MP and TMOV34S301MPX2696) are ROHS3 Compliant. Both substitutes are REACH Unaffected. This represents an improvement in regulatory compliance for new applications and obsolescence replacements.

Q: What mounting considerations apply to these parts?

A: All three parts (original and substitutes) use identical through-hole mounting with square 34mm form factor and formed tabs in a 3-lead configuration. PCB layout and mounting procedures remain unchanged during substitution.

Q: Are there any thermal or environmental operating differences?

A: No. All parts maintain identical operating temperature range (-55°C to 85°C) and thermal protection features. Environmental performance is equivalent across all three part numbers.

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