Littelfuse V47ZU7 Equivalent & Substitute Parts

Part Overview

The Littelfuse V47ZU7 is a 47 V, 1 kA disc varistor designed for transient voltage suppression applications. This component features a 14mm disc form factor and is rated for through-hole mounting with an operating temperature range of -55°C to 85°C. The V47ZU7 is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Active alternatives with identical electrical and mechanical specifications are available from Littelfuse's current product portfolio.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	47 V
Varistor Voltage Range	42.3 V (Min) to 51.7 V (Max)
Current - Surge	1 kA
Energy Absorption	8.8 J
Maximum AC Voltage	30 V
Maximum DC Voltage	38 V
Capacitance @ 1 MHz	6270 pF
Operating Temperature	-55°C to 85°C
Package / Case	Disc 14mm
Mounting Type	Through Hole
Number of Circuits	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V47ZU7 is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage rating: 47 V (42.3 V to 51.7 V range)
Surge current capacity: 1 kA
Energy absorption: 8.8 J
Package form factor: Disc 14mm
Mounting configuration: Through Hole
Operating temperature range: -55°C to 85°C
Capacitance: 6270 pF @ 1 MHz
Compliance: ROHS3 Compliant, MSL 1

Substitute parts differ only in packaging format (Tape & Reel or Cut Tape) and product series designation (ZU, ZS, or ZT). These differences do not affect electrical performance or mechanical compatibility in the application circuit.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Current - Surge	Energy	Package / Case	Inventory (Pcs)
V47ZU7	Littelfuse Inc.	ZU	Bulk	Obsolete	47 V	1 kA	8.8 J	Disc 14mm	1131
V47ZU7P	Littelfuse	ZU	Tape & Reel (TR)	Active	47 V	1 kA	8.8 J	Disc 14mm	755
V47ZS7P	Littelfuse	ZS	Tape & Reel (TR)	Active	47 V	1 kA	8.8 J	Disc 14mm	714
V47ZS7PX1347	Littelfuse Inc.	ZS	Tape & Reel (TR)	Active	47 V	1 kA	8.8 J	Disc 14mm	756
V47ZS7PX2855	Littelfuse Inc.	ZS	Tape & Reel (TR)	Active	47 V	1 kA	8.8 J	Disc 14mm	771
V47ZT7P	Littelfuse Inc.	ZT	Cut Tape (CT)	Active	47 V	1 kA	8.8 J	Disc 14mm	757
V47ZT7PX2855	Littelfuse Inc.	ZT	Tape & Reel (TR)	Active	47 V	1 kA	8.8 J	Disc 14mm	662
V47ZU7PX2855	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	47 V	1 kA	8.8 J	Disc 14mm	624

Engineering Selection Recommendations

All listed substitute parts are active products from Littelfuse Inc. and maintain full electrical and mechanical compatibility with the obsolete V47ZU7. Selection among substitutes should be based on packaging requirements and supply chain considerations:

Direct Series Replacement (ZU Series): V47ZU7P and V47ZU7PX2855 maintain the same series designation as the original part. V47ZU7P is supplied in Tape & Reel format, while V47ZU7PX2855 is also Tape & Reel packaged. Both are active products with established supply availability.

Alternative Series Options (ZS and ZT Series): V47ZS7P, V47ZS7PX1347, V47ZS7PX2855, V47ZT7P, and V47ZT7PX2855 represent parametric equivalents from alternative Littelfuse series. These parts deliver identical electrical performance and mechanical form factor. Series designation differences reflect manufacturing process variations that do not impact circuit performance.

Packaging Considerations: Tape & Reel (TR) packaging is standard for automated assembly operations. Cut Tape (CT) packaging (V47ZT7P) is suitable for manual or semi-automated placement. Bulk packaging is no longer available in active product lines.

All substitute parts carry ROHS3 compliance and MSL 1 rating, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the V47ZU7?

A: Yes. All listed parts are electrically and mechanically equivalent. They share identical varistor voltage ratings (47 V), surge current capacity (1 kA), energy absorption (8.8 J), and physical form factor (Disc 14mm through-hole). Differences in series designation (ZU, ZS, ZT) and packaging format do not affect circuit performance.

Q: What is the difference between the ZU, ZS, and ZT series designations?

A: Series designations reflect internal Littelfuse manufacturing classifications. All three series deliver identical electrical specifications for the 47 V, 1 kA varistor rating. Selection among series is based on packaging availability and supply chain preference rather than performance differences.

Q: Which packaging format should I select for my application?

A: Tape & Reel (TR) packaging is standard for automated pick-and-place assembly. Cut Tape (CT) packaging is suitable for manual or semi-automated placement. If your original design used bulk packaging, transition to Tape & Reel format is recommended for modern manufacturing processes.

Q: Are all substitute parts currently in production?

A: Yes. All listed substitute parts carry Active product status. The original V47ZU7 is classified as Obsolete and is no longer manufactured. Active alternatives ensure long-term supply chain reliability.

Q: Do the substitute parts meet the same compliance standards as the original?

A: Yes. All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original V47ZU7 specification.

Q: Can I mix different substitute part numbers in the same production batch?

A: Yes. All substitute parts are parametrically equivalent and interchangeable. However, maintaining consistent part numbers within a single production batch is recommended for traceability and quality documentation purposes.

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