Equivalent & Substitute Parts for 173-502GAF-301

Part Overview

The 173-502GAF-301 is an NTC thermistor manufactured by Honeywell Sensing and Productivity Solutions, designed for temperature sensing applications in the 0805 (2012 Metric) surface mount package. This component features a nominal resistance of 5kΩ at 25°C with a B-value of 3550K at the 25°C/85°C reference point and operates across a temperature range of -60°C to 125°C.

The 173-502GAF-301 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this thermistor.

Substiute Parts

173-502GAF-301

Honeywell Sensing and Productivity SolutionsIn Stock: 904173-502GAF-301 Datasheet

Current PartRFQ

NHQM502B355T5

Amphenol ThermometricsIn Stock: 856NHQM502B355T5 Datasheet

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NTHS0805N02N5001JP

Vishay DaleIn Stock: 759NTHS0805N02N5001JP Datasheet

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NTHS0805N02N5001JR

Vishay DaleIn Stock: 1100NTHS0805N02N5001JR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for NTC thermistors is determined by strict alignment of electrical and mechanical parameters. The following criteria establish substitution validity:

Primary Substitution Criteria:

• Resistance value at 25°C: 5kΩ (exact match required)
• Resistance tolerance: ±5% (exact match required)
• Package / Case: 0805 (2012 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• B-Value at 25°C/85°C reference: 3550K (exact match required)

Secondary Compatibility Factors:

• Operating temperature range must encompass or equal the original specification
• Moisture Sensitivity Level: 1 (Unlimited) (compatible)
• RoHS compliance status and regulatory certifications

Parts meeting all primary criteria are classified as direct substitutes. Parts with B-value variations outside the specified reference point are evaluated based on thermal response characteristics at the 25°C/85°C measurement condition.

Parameter Comparison

Engineering Selection Recommendations

NHQM502B355T5 (Amphenol Thermometrics) is the primary direct substitute for the 173-502GAF-301. This part maintains exact electrical specifications including 5kΩ resistance at 25°C, ±5% tolerance, and 3550K B-value at the 25°C/85°C reference point. The operating temperature range of -40°C to 125°C is compatible with applications not requiring the extended -60°C lower limit. The NHQM502B355T5 is RoHS Compliant and carries Active product status, ensuring long-term supply availability. Packaging is provided in Tape & Reel (TR) format.

NTHS0805N02N5001JP and NTHS0805N02N5001JR (Vishay Dale) are alternative substitutes with the following considerations: Both parts maintain the 5kΩ resistance value and ±5% tolerance in the 0805 package with Surface Mount configuration. However, the B-value at 25°C/85°C is specified as 3486K, representing a deviation from the original 3550K specification. The operating temperature range of -40°C to 125°C is compatible with applications not requiring the extended -60°C lower limit. Both Vishay Dale parts carry RoHS Non-compliant status, which may impact suitability for applications with RoHS compliance requirements. Product status is Active, supporting supply continuity. The NTHS0805N02N5001JR variant shows higher current inventory (1026 Pcs) compared to the JP variant (706 Pcs).

For applications requiring RoHS Compliance and exact B-value matching, the NHQM502B355T5 is the recommended selection. For applications where the -60°C lower operating limit is not required and RoHS compliance is not a constraint, the Vishay Dale alternatives provide viable options with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can the NHQM502B355T5 be used as a direct replacement for the 173-502GAF-301?

A: Yes. The NHQM502B355T5 meets all primary substitution criteria: 5kΩ resistance at 25°C, ±5% tolerance, 3550K B-value at 25°C/85°C, 0805 (2012 Metric) package, and Surface Mount configuration. The operating temperature range of -40°C to 125°C is compatible with applications not requiring operation below -40°C. RoHS Compliant status matches the original part.

Q: What is the significance of the B-value difference between the Honeywell part and the Vishay Dale alternatives?

A: The B-value characterizes the thermal response of an NTC thermistor across a temperature range. The 173-502GAF-301 specifies 3550K at the 25°C/85°C reference point, while the Vishay Dale parts (NTHS0805N02N5001JP and NTHS0805N02N5001JR) specify 3486K at the same reference point. This 64K difference represents a variation in thermal sensitivity. Applications with strict thermal response requirements should account for this difference in circuit design and calibration.

Q: Are the Vishay Dale parts suitable for applications requiring RoHS Compliance?

A: No. The NTHS0805N02N5001JP and NTHS0805N02N5001JR are classified as RoHS Non-compliant. Applications with RoHS compliance mandates must use the NHQM502B355T5 (Amphenol Thermometrics), which carries RoHS Compliant status.

Q: What is the impact of the reduced operating temperature range on the Amphenol and Vishay Dale substitutes?

A: The 173-502GAF-301 operates from -60°C to 125°C, while the NHQM502B355T5 and Vishay Dale alternatives operate from -40°C to 125°C. The upper temperature limit remains unchanged. Applications requiring operation below -40°C cannot use these substitutes. Applications operating within the -40°C to 125°C range are unaffected.

Q: What packaging format is available for each substitute part?

A: The NHQM502B355T5 is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The Vishay Dale parts (NTHS0805N02N5001JP and NTHS0805N02N5001JR) do not specify packaging format in the provided data. Confirm packaging requirements with the supplier before procurement.

Q: How do the current inventory levels compare across available options?

A: The 173-502GAF-301 has 799 Pcs in stock. The NHQM502B355T5 has 752 Pcs available. The Vishay Dale NTHS0805N02N5001JR variant has the highest inventory at 1026 Pcs, while the JP variant has 706 Pcs. Inventory levels should be verified at the time of procurement, as stock quantities are subject to change.