Littelfuse AGRF900 PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse AGRF900 is a polymeric PTC resettable fuse rated for 16V maximum voltage with a 9A hold current (Ih). This through-hole radial disc component is designed for overcurrent protection in electronic circuits and automatically resets after a fault condition is cleared. The part is active in production with AEC-Q200 ratings and ROHS3 compliance. Substitute parts may be required due to packaging availability, lead time constraints, or specific certification requirements for particular applications.

Substiute Parts

AGRF900

LittelfuseIn Stock: 1316AGRF900 Datasheet

Current PartRFQ

16R900GF

Littelfuse Inc.In Stock: 136316R900GF Datasheet

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16R900GMR

LittelfuseIn Stock: 164616R900GMR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AGRF900 is determined by the following critical parameters:

• Voltage rating must equal or exceed 16V maximum
• Current hold (Ih) rating must equal 9A
• Current trip (It) rating must fall within acceptable operating margins (15.3A to 16.5A)
• Mounting type must remain through-hole radial disc configuration
• Physical dimensions must be compatible with PCB footprints (14.00mm x 3.00mm disc diameter)
• Lead spacing must accommodate standard 5.05mm to 5.10mm pitch requirements
• Operating temperature range must cover -40°C to 85°C minimum
• RoHS3 compliance is required for environmental standards

The substitute parts 16R900GF and 16R900GMR meet these criteria. Both are polymeric PTC resettable fuses from Littelfuse with identical voltage and current hold ratings, compatible physical dimensions, and equivalent thermal performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active production status with ROHS3 compliance. The AGRF900 carries AEC-Q200 ratings, which provide automotive-grade reliability qualification. The 16R900GF and 16R900GMR parts are qualified to cURus and TUV standards, offering alternative certification pathways for applications requiring third-party validation.

Dimensional variations exist in seated height (AGRF900 at 0.906" versus 16R900GF and 16R900GMR at 0.854") and lead spacing (0.199" versus 0.201"), which remain within standard PCB tolerance ranges for radial through-hole components. Initial resistance (Ri) differs slightly between the AGRF900 (4.1 mOhms minimum) and the 16R series (4.7 mOhms minimum), and trip current timing varies (6 seconds versus 5.5 seconds), but these variations fall within acceptable operational margins for polymeric PTC fuse applications.

Packaging format selection depends on procurement workflow: the AGRF900 is supplied in bag format, 16R900GF in bulk, and 16R900GMR in cut tape. All three parts are available in production quantities.

Frequently Asked Questions (FAQ)

Q: Can 16R900GF or 16R900GMR be used as direct replacements for AGRF900 in existing designs?

A: Yes. Both substitute parts share identical voltage (16V), current hold (9A), and maximum current (100A) ratings. Physical dimensions are compatible with standard radial through-hole PCB footprints. Minor differences in seated height (0.906" to 0.854") and lead spacing (0.199" to 0.201") are within acceptable tolerances for through-hole assembly processes.

Q: What is the significance of the different trip current values (16.5A vs. 15.3A)?

A: The AGRF900 trips at 16.5A while the 16R900GF and 16R900GMR trip at 15.3A. Both values remain within the polymeric PTC fuse operating envelope for 9A hold current devices. The lower trip point of the 16R series provides slightly faster fault response, which may be advantageous in sensitive circuit protection applications.

Q: How do the resistance specifications affect circuit performance?

A: Initial resistance (Ri) and post-trip resistance (R1) determine voltage drop and thermal characteristics during normal and fault conditions. The AGRF900 has a minimum initial resistance of 4.1 mOhms compared to 4.7 mOhms for the 16R series. All three parts specify a maximum post-trip resistance of 14.6 mOhms. These differences are negligible for most circuit applications and do not affect functional compatibility.

Q: What certifications should I consider for my application?

A: The AGRF900 carries AEC-Q200 automotive qualification. The 16R900GF and 16R900GMR are certified to cURus and TUV standards. Select based on your application's certification requirements. All three parts are ROHS3 compliant.

Q: Does packaging format affect electrical performance?

A: No. Bag, bulk, and cut tape packaging formats do not affect electrical characteristics. Selection depends on procurement volume, assembly line automation requirements, and inventory management practices.

Q: Are there any thermal performance differences between these parts?

A: All three parts operate across the identical temperature range of -40°C to 85°C. Time-to-trip specifications differ slightly (6 seconds for AGRF900 versus 5.5 seconds for the 16R series), but both fall within standard polymeric PTC fuse response times.