Equivalent & Substitute Parts Reference for Littelfuse V571NA34

Part Overview

Littelfuse V571NA34 is a Transient Voltage Suppressor (TVS) varistor designed to protect electronic circuits from transient voltage events. It features a varistor voltage of 910 V (typical) with a surge current capability of 40 kA and is packaged in a 34mm square surface-mount format. This model holds an obsolete product status, necessitating the identification of alternative models to maintain design continuity and inventory availability.

Key Parameters

Manufacturer Part Number	Series	Part Status	Maximum AC Volts	Maximum DC Volts	Varistor Voltage (Min)	Varistor Voltage (Typ)	Varistor Voltage (Max)	Current - Surge	Energy	Number of Circuits	Capacitance @ Frequency	Operating Temperature	Mounting Type	Package / Case	RoHS Status	Moisture Sensitivity Level (MSL)	ECCN	HTSUS
V571NA34	NA	Obsolete	575 V	730 V	805 V	910 V	1 kV	40 kA	770J	1	2200 pF @ 1 MHz	-55°C ~ 85°C (TA)	Surface Mount	Square 34mm	ROHS3 Compliant	1 (Unlimited)	EAR99	8533.40.4000

Substitute Part Grouping Explanation

Substitution is based only on explicit matching of electrical and mechanical parameters, ensuring compatibility within the Transient Voltage Suppressors (TVS) category. Criteria include: Maximum AC Volts, Maximum DC Volts, Varistor Voltage (Min/Typ/Max), Current - Surge, Energy, Number of Circuits, Capacitance @ Frequency, Operating Temperature, Package/Case size, Mounting Type, RoHS Compliance, and Moisture Sensitivity Level.

Parameter Comparison

Parameter	V571NA34	V571DHB34
Manufacturer Part Number	V571NA34	V571DHB34
Manufacturer	Littelfuse Inc.	Littelfuse
Category	Transient Voltage Suppressors (TVS)	Transient Voltage Suppressors (TVS)
Maximum AC Volts	575 V	575 V
Maximum DC Volts	730 V	730 V
Varistor Voltage (Min)	805 V	819 V
Varistor Voltage (Typ)	910 V	910 V
Varistor Voltage (Max)	1 kV	1.001 kV
Current - Surge	40 kA	40 kA
Energy	770J	770J
Number of Circuits	1	1
Capacitance @ Frequency	2200 pF @ 1 MHz	2200 pF @ 1 MHz
Operating Temperature	-55°C ~ 85°C (TA)	-55°C ~ 85°C (TA)
Mounting Type	Surface Mount	Through Hole
Package / Case	Square 34mm	Square 34mm, Tabs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8533.40.4000	8533.40.4000

Engineering Selection Recommendations

V571NA34 is obsolete, and V571DHB34 is listed as active. Both parts match in all key electrical and mechanical parameters, except for mounting type (Surface Mount vs. Through Hole). Both are ROHS3 Compliant and classified under MSL 1 (Unlimited), with identical ECCN and HTSUS codes. Selection is guided strictly by the obsolete status of V571NA34 and the active status and compliance of V571DHB34.

Frequently Asked Questions (FAQ)

Q: What are the main criteria for substituting V571NA34 with V571DHB34?
A: The main criteria include matching Maximum AC/DC Voltages, Varistor Voltage (Min/Typ/Max), Surge Current, Energy rating, Number of Circuits, Capacitance, Operating Temperature, RoHS compliance, MSL, and package size. Mounting style is different: Surface Mount (V571NA34) vs. Through Hole (V571DHB34).

Q: Does the mounting type impact substitution?
A: Yes, mounting type differs: V571NA34 is Surface Mount, while V571DHB34 is Through Hole. Ensure mechanical compatibility with the intended PCB layout.

Q: Are the energy ratings and surge capabilities identical?
A: Yes, both offer 770J energy rating and 40 kA surge current capability based on the provided parameters.

Q: Does RoHS compliance match in both components?
A: Yes, both V571NA34 and V571DHB34 are ROHS3 Compliant.

Q: Are additional certifications or regulatory codes relevant?
A: Both parts share ECCN EAR99 and HTSUS 8533.40.4000, and carry MSL 1 (Unlimited). No differences based on provided compliance codes.

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