Littelfuse V33MA1S Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The Littelfuse V33MA1S is a 33V varistor designed for transient voltage suppression applications. This through-hole component operates across a wide temperature range (-55°C to 85°C) and is compliant with RoHS3 and REACH standards. The part is currently in active production status with 1167 units available in inventory. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	33 V
Varistor Voltage Range	29.5 V (Min) to 36.5 V (Max)
Current - Surge	40 A
Maximum AC Volts	20 V
Maximum DC Volts	26 V
Energy	0.14 J
Capacitance @ 1 MHz	300 pF
Operating Temperature Range	-55°C to 85°C
Package / Case	SOD-83A Axial
Mounting Type	Through Hole
Number of Circuits	1

Substitute Part Grouping Explanation

The V33MA1B qualifies as a parametric equivalent to the V33MA1S based on the following critical substitution criteria:

Electrical Parameters: Both parts maintain identical varistor voltage specifications (29.5 V minimum, 33 V typical, 36.5 V maximum), surge current rating (40 A), maximum AC voltage (20 V), and maximum DC voltage (26 V). The capacitance at 1 MHz is identical at 300 pF.

Mechanical Parameters: Both components use the SOD-83A axial package with through-hole mounting, ensuring direct mechanical compatibility in existing circuit board layouts.

Environmental and Compliance: Both parts operate across the same temperature range (-55°C to 85°C), carry RoHS3 compliance, REACH unaffected status, and identical moisture sensitivity level (MSL 1 - Unlimited).

Energy Rating Variance: The V33MA1B has an energy rating of 0.15 J compared to 0.14 J for the V33MA1S. This minor difference (0.01 J) falls within acceptable tolerance for transient voltage suppression applications and does not restrict substitution eligibility.

Parameter Comparison

Parameter	V33MA1S (Main Part)	V33MA1B (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)	Transient Voltage Suppressors (TVS)
Series	MA	MA
Varistor Voltage (Min)	29.5 V	29.5 V
Varistor Voltage (Typ)	33 V	33 V
Varistor Voltage (Max)	36.5 V	36.5 V
Current - Surge	40 A	40 A
Maximum AC Volts	20 V	20 V
Maximum DC Volts	26 V	26 V
Energy	0.14 J	0.15 J
Capacitance @ 1 MHz	300 pF	300 pF
Number of Circuits	1	1
Operating Temperature Range	-55°C to 85°C	-55°C to 85°C
Package / Case	SOD-83A Axial	SOD-83A Axial
Mounting Type	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

Both the V33MA1S and V33MA1B are active production components from Littelfuse Inc. with full RoHS3 and REACH compliance. Selection between these parts should be based on inventory availability and procurement lead times, as both meet identical electrical and mechanical requirements for 33V transient voltage suppression applications.

The V33MA1B offers higher inventory availability (2642 units in stock versus 1167 units for the V33MA1S), making it a viable alternative for applications requiring immediate component procurement. The marginal energy rating difference (0.01 J) does not impact functional equivalence in standard TVS applications.

Both parts are suitable for through-hole PCB assembly and operate reliably across the full -55°C to 85°C temperature range. Component selection should align with established supply chain protocols and design validation requirements specific to your application.

Frequently Asked Questions (FAQ)

Q: Can the V33MA1B be used as a direct replacement for the V33MA1S in existing designs?

A: Yes. Both parts share identical varistor voltage specifications (33 V typical), surge current rating (40 A), package type (SOD-83A axial), and mounting configuration (through-hole). Electrical and mechanical compatibility is confirmed across all critical parameters.

Q: What is the significance of the energy rating difference between these parts?

A: The V33MA1B has an energy rating of 0.15 J compared to 0.14 J for the V33MA1S. This 0.01 J difference represents a minor variance within the tolerance band for transient voltage suppression components and does not restrict substitution eligibility for standard applications.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the V33MA1S and V33MA1B carry RoHS3 compliance and REACH unaffected status. Both maintain moisture sensitivity level 1 (unlimited), indicating no special handling requirements during storage or assembly.

Q: What is the operating temperature range for these varistors?

A: Both parts operate across -55°C to 85°C (TA). This range supports applications in industrial, automotive, and consumer electronics environments requiring wide temperature tolerance.

Q: Are there any package or mounting differences between these parts?

A: No. Both components use the SOD-83A axial package with through-hole mounting. PCB layout and assembly processes remain identical between the two parts.

Q: Which part should be selected based on availability?

A: The V33MA1B currently has higher inventory availability (2642 units in stock) compared to the V33MA1S (1167 units in stock). For procurement requiring immediate availability, the V33MA1B is the preferred selection.

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