VC121018J390TP Equivalent & Substitute Parts

Part Overview

The VC121018J390TP is a TransGuard® 25.5 V 500 A surface mount varistor in MLCV 1210 (3225 Metric) package. This transient voltage suppressor (TVS) is designed for transient overvoltage protection in electronic circuits. The part is Active status and ROHS3 Compliant. Alternative models become necessary when the primary part is unavailable from inventory, when specific packaging requirements differ, or when alternative series certifications (such as automotive-grade qualification) are required.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	25.5 V
Varistor Voltage Range (Min-Max)	22.95 V – 28.05 V
Current - Surge	500 A
Maximum AC Volts	13 V
Maximum DC Volts	18 V
Energy	1.6 J
Number of Circuits	1
Capacitance @ 1 kHz	3100 pF
Operating Temperature Range	-55°C to 125°C
Mounting Type	Surface Mount, MLCV
Package / Case	1210 (3225 Metric)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the VC121018J390TP is determined by electrical and mechanical parameter matching within allowed tolerances:

Critical Parameters for Substitution:

Varistor Voltage (Typ): 25.5 V (allowed range: 22.95 V – 28.05 V)
Current - Surge: 500 A
Energy: 1.6 J
Package / Case: 1210 (3225 Metric)
Mounting Type: Surface Mount, MLCV
Number of Circuits: 1
Operating Temperature Range: -55°C to 125°C
RoHS Compliance: ROHS3

All substitute parts listed maintain identical electrical performance and mechanical compatibility with the primary part. Variations exist only in packaging designation (TR variants with different suffix codes) and product series designation, with one substitute offering automotive-grade qualification (AEC-Q200).

Parameter Comparison

Parameter	VC121018J390TP	VC121018J390DP	VCAS121018J390DP	VCAS121018J390DZ	VCAS121018J390RZ
Manufacturer	KYOCERA AVX	KYOCERA AVX	KYOCERA AVX	KYOCERA AVX	KYOCERA AVX
Series	TransGuard®	TransGuard®	TransGuard®	FLEXITERM®	TransGuard®
Varistor Voltage (Typ)	25.5 V	25.5 V	25.5 V	25.5 V	25.5 V
Varistor Voltage (Min-Max)	22.95–28.05 V	22.95–28.05 V	22.95–28.05 V	22.95–28.05 V	22.95–28.05 V
Current - Surge	500 A	500 A	500 A	500 A	500 A
Maximum AC Volts	13 V	13 V	13 V	13 V	13 V
Maximum DC Volts	18 V	18 V	18 V	18 V	18 V
Energy	1.6 J	1.6 J	1.6 J	1.6 J	1.6 J
Number of Circuits	1	1	1	1	1
Capacitance @ 1 kHz	3100 pF	3100 pF	3100 pF	3100 pF	3100 pF
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Package / Case	1210 (3225 Metric)	1210 (3225 Metric)	1210 (3225 Metric)	1210 (3225 Metric)	1210 (3225 Metric)
Mounting Type	Surface Mount, MLCV	Surface Mount, MLCV	Surface Mount, MLCV	Surface Mount, MLCV	Surface Mount, MLCV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active
Automotive Grade	—	—	—	AEC-Q200	—
Inventory (Pcs)	5911	8195	28839	5091	4625

Engineering Selection Recommendations

All listed substitute parts are parametrically equivalent to the VC121018J390TP and maintain identical electrical and mechanical compatibility. Selection between equivalents should be based on:

Product Availability: VCAS121018J390DP offers the highest inventory availability (28,839 units), making it suitable for high-volume production. VC121018J390DP and VCAS121018J390RZ provide alternatives with substantial inventory.

Automotive Applications: VCAS121018J390DZ is the only substitute qualified to AEC-Q200 automotive standard and is designated as automotive-grade. This part is selected when design specifications require automotive qualification.

Series Designation: VC121018J390TP and most substitutes use the TransGuard® series. VCAS121018J390DZ is from the FLEXITERM® series and includes automotive qualification.

Compliance: All substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring environmental and moisture handling compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use these substitute parts interchangeably with the VC121018J390TP?

A: Yes, all listed substitute parts are parametrically equivalent. They share identical varistor voltage (25.5 V typical), surge current (500 A), energy rating (1.6 J), package (1210/3225 Metric), and operating temperature range (-55°C to 125°C). Direct substitution is electrically and mechanically valid.

Q: What is the difference between the TransGuard® and FLEXITERM® series?

A: Both series are from KYOCERA AVX and meet the same electrical specifications for this part. FLEXITERM® (represented by VCAS121018J390DZ) includes AEC-Q200 automotive qualification, while TransGuard® parts are general-purpose grade. Series designation reflects manufacturing process and qualification track, not electrical performance.

Q: Which substitute should I select if automotive qualification is required?

A: VCAS121018J390DZ is the only automotive-qualified option, certified to AEC-Q200. It carries identical electrical ratings and package specifications as the primary part.

Q: Does packaging designation affect performance or compatibility?

A: Packaging designation (TP, DP, DZ, RZ suffixes) indicates tape and reel configuration and lead finish specification. All variants use the same 1210 (3225 Metric) surface mount MLCV package. Selection of packaging variant depends on production equipment compatibility and tape configuration requirements, not electrical performance.

Q: Are all substitutes RoHS compliant?

A: Yes, all substitute parts maintain ROHS3 compliance and MSL 1 rating, matching the primary part specification.

Q: Can inventory levels influence my part selection?

A: Inventory availability may be a practical consideration for procurement. VCAS121018J390DP offers the highest stock level (28,839 units), while other substitutes provide alternative inventory sources with smaller quantities available.

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