173-103LAD-301 NTC Thermistor Equivalent & Substitute Parts

Part Overview

The 173-103LAD-301 is an NTC thermistor manufactured by Honeywell Sensing and Productivity Solutions, rated at 10kΩ resistance at 25°C with a B25/85 value of 3750K. This surface-mount component in 0805 (2012 Metric) package is designed for temperature sensing applications across a -60°C to 125°C operating range. The product is currently obsolete, making identification of equivalent substitute parts essential for ongoing production support and design continuity.

Substiute Parts

173-103LAD-301

Honeywell Sensing and Productivity SolutionsIn Stock: 749173-103LAD-301 Datasheet

Current PartRFQ

NTCS0805E3103GMT

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 5342NTCS0805E3103GMT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 173-103LAD-301 is determined by the following critical parameters:

Primary Matching Criteria:

• Resistance value: 10kΩ at 25°C
• Package type: 0805 (2012 Metric) surface mount
• Resistance tolerance: ±2%
• Operating temperature compatibility
• B-value characteristics for thermal response matching

Secondary Compatibility Factors:

• RoHS compliance status
• Moisture sensitivity level
• Mounting configuration

The NTCS0805E3103GMT from Vishay Beyschlag/Draloric/BC Components qualifies as a substitute based on matching resistance value, package format, tolerance specifications, and surface-mount configuration. Both components share identical 0805 package geometry and ±2% resistance tolerance, enabling direct footprint compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution:

The NTCS0805E3103GMT is suitable as a substitute for the obsolete 173-103LAD-301 based on the following factors:

• Identical 10kΩ resistance value and ±2% tolerance specification
• Matching 0805 (2012 Metric) package format enabling direct PCB footprint compatibility
• Both components feature MSL 1 (Unlimited) moisture sensitivity classification
• Active product status of the Vishay component ensures ongoing availability and supply chain continuity
• ROHS3 compliance exceeds the RoHS compliance requirement of the original part
• Operating temperature range of -40°C to 150°C encompasses the original -60°C to 125°C specification

Parameter Variance Considerations:

The B25/85 value differs between components (3750K vs. 3570K), representing a 4.8% variance. The Vishay component also carries a wider B value tolerance of ±3% compared to the original ±1.3%. These differences affect thermal response characteristics and must be evaluated within the context of the specific application's temperature measurement accuracy requirements.

The Vishay NTCS0805E3103GMT carries AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the NTCS0805E3103GMT be used as a direct replacement for the 173-103LAD-301?

A: Yes, the NTCS0805E3103GMT qualifies as a substitute based on matching resistance value (10kΩ), resistance tolerance (±2%), package format (0805), and surface-mount configuration. Both components are compatible with identical PCB footprints.

Q: What is the significance of the B25/85 value difference (3750K vs. 3570K)?

A: The B-value determines the thermistor's thermal response curve. The 4.8% difference between components affects temperature measurement accuracy across the operating range. Applications requiring precise thermal response matching to the original 3750K specification should evaluate this variance against system tolerance requirements.

Q: Why is the B value tolerance wider on the Vishay component (±3% vs. ±1.3%)?

A: The wider tolerance on the Vishay component reflects different manufacturing specifications. Applications sensitive to B-value precision should account for this increased tolerance band in thermal calibration and measurement accuracy calculations.

Q: Does the extended operating temperature range of the Vishay component (-40°C to 150°C) affect compatibility?

A: No. The extended range of the NTCS0805E3103GMT encompasses the original operating specification of -60°C to 125°C. The substitute component maintains performance across the original temperature window and extends capability beyond it.

Q: What is the advantage of AEC-Q200 qualification on the Vishay component?

A: AEC-Q200 qualification indicates the component meets automotive industry reliability and quality standards. This certification is beneficial for applications requiring automotive-grade component assurance, though it is not required for direct functional substitution.

Q: Are there any moisture sensitivity or RoHS compliance concerns with substitution?

A: No. Both components share MSL 1 (Unlimited) classification, and the Vishay component's ROHS3 compliance exceeds the RoHS compliance requirement of the original part, ensuring environmental and regulatory compatibility.