V47ZS7 Equivalent & Substitute Parts

Part Overview

The V47ZS7 is a 47 V, 1 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse in a through-hole disc package (14mm). This component is classified as obsolete, though functionally equivalent active alternatives are available. The V47ZS7 was designed for transient voltage suppression applications requiring a nominal varistor voltage of 47 V with 1 kA surge current capacity and 8.8 J energy absorption. Due to its obsolete status, direct substitution with active product variants is necessary for new designs and ongoing procurement.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the V47ZS7 is determined by strict electrical and mechanical parameter matching:

Electrical Parameters (Critical for Substitution):

Varistor voltage range: 42.3 V – 51.7 V (minimum, typical, maximum)
Surge current capacity: 1 kA
Energy absorption: 8.8 J
Maximum AC/DC voltage ratings: 30 V AC / 38 V DC
Operating temperature range: -55°C to 85°C
Capacitance @ 1 MHz: 6270 pF

Mechanical Parameters (Critical for Substitution):

Mounting type: Through Hole
Package / Case: Disc 14mm
Number of circuits: 1

Packaging Variants (Allowed Substitution Differences):

Original packaging: Bulk
Substitute packaging options: Tape & Reel (TR), Cut Tape (CT)

All substitute parts listed maintain identical electrical specifications and mechanical form factor. Packaging differences reflect distribution and assembly convenience without affecting electrical performance or circuit compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Packaging	Varistor Voltage (Typ)	Surge Current	Energy	Max AC / DC Volts	Temp Range	Capacitance @ 1 MHz	Inventory
V47ZS7	Littelfuse	ZS	Obsolete	Bulk	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	996 Pcs
V47ZS7P	Littelfuse	ZS	Active	Tape & Reel	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	714 Pcs
V47ZS7PX1347	Littelfuse Inc.	ZS	Active	Tape & Reel	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	756 Pcs
V47ZS7PX2855	Littelfuse Inc.	ZS	Active	Tape & Reel	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	771 Pcs
V47ZT7P	Littelfuse Inc.	ZT	Active	Cut Tape	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	757 Pcs
V47ZT7PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	662 Pcs
V47ZU7P	Littelfuse	ZU	Active	Tape & Reel	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	755 Pcs
V47ZU7PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel	47 V	1 kA	8.8 J	30 V / 38 V	-55°C to 85°C	6270 pF	624 Pcs

Engineering Selection Recommendations

All substitute parts maintain full electrical and mechanical compatibility with the V47ZS7. Selection criteria are based on product status and compliance:

Primary Recommendation (Direct Series Match): V47ZS7P, V47ZS7PX1347, and V47ZS7PX2855 are active products within the same ZS series. These parts provide direct functional equivalence with identical electrical performance and are recommended for applications requiring series continuity.

Alternative Recommendations (Cross-Series Match): V47ZT7P, V47ZT7PX2855 (ZT series) and V47ZU7P, V47ZU7PX2855 (ZU series) are active products with identical electrical specifications and mechanical form factor. These cross-series alternatives are suitable for applications where series designation is not a procurement constraint.

Compliance Status: All substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited). Active product variants include REACH Unaffected status, confirming regulatory compliance for current procurement and deployment.

Packaging Considerations:

Tape & Reel (TR) packaging is standard for automated assembly processes
Cut Tape (CT) packaging is suitable for manual or semi-automated assembly
Selection between packaging variants depends on assembly methodology, not electrical performance

Frequently Asked Questions (FAQ)

Q: Can V47ZS7P be used as a direct replacement for V47ZS7? A: Yes. V47ZS7P is an active product variant of the same ZS series with identical electrical parameters (47 V nominal, 1 kA surge current, 8.8 J energy) and mechanical specifications (through-hole, disc 14mm package). The only difference is packaging format (Tape & Reel vs. Bulk).

Q: What is the difference between V47ZS7P and V47ZT7P? A: Both parts have identical electrical specifications and mechanical form factor. The difference is the series designation (ZS vs. ZT). All electrical parameters—varistor voltage, surge current, energy absorption, temperature range, and capacitance—are identical. Series designation reflects internal manufacturing or design lineage but does not affect circuit performance.

Q: Are the packaging variants (Tape & Reel, Cut Tape) electrically equivalent? A: Yes. Packaging format affects only distribution, handling, and assembly convenience. All packaging variants of the same electrical specification deliver identical electrical performance in the circuit.

Q: Why is V47ZS7 listed as obsolete? A: The V47ZS7 is no longer in active production. However, multiple active alternatives with identical electrical and mechanical specifications are available from Littelfuse, ensuring continued availability for replacement and new designs.

Q: Can I substitute V47ZU7P for V47ZS7 in an existing design? A: Yes. V47ZU7P maintains all critical electrical parameters (47 V nominal varistor voltage, 1 kA surge current, 8.8 J energy, -55°C to 85°C operating range) and mechanical specifications (through-hole, disc 14mm). The ZU series designation does not affect electrical compatibility.

Q: What inventory levels are available for each substitute? A: Current inventory includes V47ZS7P (714 Pcs), V47ZS7PX1347 (756 Pcs), V47ZS7PX2855 (771 Pcs), V47ZT7P (757 Pcs), V47ZT7PX2855 (662 Pcs), V47ZU7P (755 Pcs), and V47ZU7PX2855 (624 Pcs). All parts are listed as new original stock.

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