AGRF400-2 Equivalent & Substitute Parts

Part Overview

The AGRF400-2 is a polymeric PTC resettable fuse manufactured by Littelfuse, rated for 16V at 4A hold current with through-hole radial disc packaging. This component provides overcurrent protection in electronic circuits through automatic thermal reset capability. The part is active in production with AEC-Q200 automotive qualification and ROHS3 compliance. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	4 A
Current - Trip (It)	7.6 A
Current - Max	100 A
Mounting Type	Through Hole
Package / Case	Radial, Disc
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AGRF400-2 is determined by the following critical parameters:

Voltage rating: 16V maximum
Current hold rating: 4A maximum
Mounting configuration: Through hole radial disc
Physical dimensions: 0.350" L x 0.118" W (8.90mm x 3.00mm)
Lead spacing: 0.199" to 0.201" (5.05mm to 5.10mm)
Operating temperature range: -40°C to 85°C
RoHS3 compliance

The substitute parts 16R400GPR and 16R400GU meet these core electrical and mechanical parameters, enabling direct substitution in circuit designs. Both alternatives are manufactured by Littelfuse and maintain identical voltage, hold current, and physical form factor specifications.

Parameter Comparison

Parameter	AGRF400-2	16R400GPR	16R400GU
Manufacturer	Littelfuse	Littelfuse Inc.	Littelfuse Inc.
Series	PolySwitch®, AGRF	POLY-FUSE®, 16R	POLY-FUSE®, 16R
Voltage - Max	16V	16V	16V
Current - Hold (Ih) (Max)	4 A	4 A	4 A
Current - Trip (It)	7.6 A	6.8 A	6.8 A
Current - Max	100 A	100 A	100 A
Time to Trip	2 s	1.7 s	1.7 s
Resistance - Initial (Ri) (Min)	18.6 mOhms	21 mOhms	21 mOhms
Resistance - Post Trip (R1) (Max)	61 mOhms	60 mOhms	60 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.350" L x 0.118" W (8.90mm x 3.00mm)	0.350" L x 0.118" W (8.90mm x 3.00mm)	0.350" L x 0.118" W (8.90mm x 3.00mm)
Height - Seated (Max)	0.555" (14.10mm)	0.504" (12.80mm)	0.504" (12.80mm)
Lead Spacing	0.199" (5.05mm)	0.201" (5.10mm)	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts maintain active production status with ROHS3 compliance and REACH unaffected designation. The AGRF400-2 carries AEC-Q200 automotive qualification, suitable for applications requiring automotive-grade reliability. The 16R400GPR and 16R400GU alternatives are qualified by cURus and TUV agencies, meeting industrial and consumer application standards.

Selection between these parts depends on specific application requirements:

AGRF400-2: Select when AEC-Q200 automotive qualification is mandatory
16R400GPR: Cut tape packaging suitable for automated assembly processes
16R400GU: Bulk packaging for high-volume manual assembly or reel-based operations

All three parts are electrically and mechanically compatible for direct substitution in 16V, 4A hold current circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can 16R400GPR and 16R400GU be used interchangeably with AGRF400-2?

A: Yes. All three parts share identical voltage (16V), hold current (4A), physical dimensions (0.350" L x 0.118" W), and lead spacing (0.199" to 0.201"). The primary difference is packaging format: AGRF400-2 and 16R400GPR are supplied in cut tape, while 16R400GU is supplied in bulk.

Q: What is the difference between the AGRF400-2 and 16R400 series?

A: Both are polymeric PTC resettable fuses from Littelfuse with identical electrical ratings. The AGRF400-2 belongs to the PolySwitch® series with AEC-Q200 qualification, while 16R400GPR and 16R400GU belong to the POLY-FUSE® 16R series with cURus and TUV certification.

Q: Are there differences in trip characteristics between these parts?

A: Minor differences exist. The AGRF400-2 has a trip current (It) of 7.6A and 2-second trip time, while 16R400GPR and 16R400GU have 6.8A trip current and 1.7-second trip time. Initial resistance (Ri) is 18.6 mOhms for AGRF400-2 versus 21 mOhms for the 16R series.

Q: Which part should be selected for automotive applications?

A: The AGRF400-2 is recommended for automotive applications due to AEC-Q200 qualification. The 16R400 series is suitable for industrial and consumer applications with cURus and TUV certification.

Q: Does packaging affect electrical performance?

A: No. Cut tape (CT) and bulk packaging formats do not affect electrical characteristics. Packaging selection depends on assembly process requirements and inventory management practices.

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