V275LU40B Equivalent & Substitute Parts

Part Overview

The V275LU40B is a 421 V, 6.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The varistor provides protection across a -55°C to 85°C operating temperature range with ROHS3 compliance and unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Manufacturer Part Number	V275LU40B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Maximum AC Volts	275 V
Maximum DC Volts	369 V
Varistor Voltage (Typical)	421 V
Current - Surge	6.5 kA
Energy	140 J
Mounting Type	Through Hole
Package / Case	Disc 20mm
Operating Temperature	-55°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the V275LU40B are classified based on electrical parameter equivalence and packaging configuration. All substitute parts maintain identical electrical specifications: 275 V maximum AC rating, 369 V maximum DC rating, 421 V typical varistor voltage, 6.5 kA surge current, and 140 J energy rating. The substitution logic is organized by two primary criteria:

Electrical Equivalence: All listed substitutes match the core electrical parameters of the V275LU40B, ensuring functional compatibility in circuit protection applications.

Packaging Variation: Substitutes differ in packaging format (Tape & Reel or Cut Tape) and series designation (LU, LS, LT), which affects procurement and assembly processes but not electrical performance.

Product Status: Active substitute parts replace the obsolete V275LU40B, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Series	Packaging	Max AC (V)	Max DC (V)	Varistor Voltage Typ (V)	Surge Current (kA)	Energy (J)	Product Status	Inventory (Pcs)
V275LU40B	LU	Bulk	275	369	421	6.5	140	Obsolete	734
V275LU40BP	LU	Tape & Reel (TR)	275	369	421	6.5	140	Active	841
V275LS40BP	LS	Tape & Reel (TR)	275	369	421	6.5	140	Active	857
V275LS40BPX10	LS	Tape & Reel (TR)	275	369	421	6.5	140	Active	781
V275LS40BPX2855	LS	Tape & Reel (TR)	275	369	421	6.5	140	Active	887
V275LT40BP	LT	Cut Tape (CT)	275	369	421	6.5	140	Active	2578
V275LT40BPX10	LT	Tape & Reel (TR)	275	369	421	6.5	140	Active	853
V275LT40BPX2855	LT	Tape & Reel (TR)	275	369	421	6.5	140	Active	680
V275LU40BPX10	LU	Tape & Reel (TR)	275	369	421	6.5	140	Active	909
V275LU40BPX2855	LU	Tape & Reel (TR)	275	369	421	6.5	140	Active	748

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance and supply chain stability. The V275LU40B is obsolete and should be replaced with an active equivalent for new designs and ongoing procurement.

Selection between substitute parts depends on assembly and procurement requirements:

For automated assembly with tape-fed equipment: V275LT40BP (Cut Tape) offers the highest inventory availability at 2,578 pieces. Tape & Reel variants (V275LU40BP, V275LS40BP, V275LT40BPX10, V275LT40BPX2855, V275LU40BPX10, V275LU40BPX2855, V275LS40BPX10, V275LS40BPX2855) support continuous feed processes with varying reel configurations.

For through-hole manual assembly or low-volume production: Any active substitute maintains electrical equivalence and mechanical compatibility with the original V275LU40B footprint.

For supply chain continuity: Multiple series options (LU, LS, LT) from Littelfuse Inc. provide redundancy and reduce single-source risk.

Frequently Asked Questions (FAQ)

Q: Can V275LU40B be directly replaced with any of the listed substitutes?

A: Yes. All substitute parts maintain identical electrical parameters (275 V AC maximum, 369 V DC maximum, 421 V typical varistor voltage, 6.5 kA surge current, 140 J energy) and through-hole disc 20mm mechanical form factor. Substitution is electrically and mechanically valid.

Q: What is the difference between series designations (LU, LS, LT)?

A: Series designations indicate internal design variants within Littelfuse's varistor product line. All three series (LU, LS, LT) deliver identical electrical performance for this voltage and current rating. Series selection is driven by packaging availability and procurement preference.

Q: How do packaging options (Tape & Reel vs. Cut Tape) affect component selection?

A: Packaging affects assembly process compatibility and procurement logistics. Tape & Reel (TR) packaging supports automated pick-and-place equipment with continuous feed capability. Cut Tape (CT) packaging is suitable for manual assembly or lower-volume production runs. Electrical performance is identical across all packaging formats.

Q: Why is the V275LU40B marked as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. Active substitutes with identical electrical specifications are available to support existing designs and enable new product development without performance compromise.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and REACH unaffected status, meeting current environmental and regulatory requirements for electronic component procurement.

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