GL202F9J NTC Thermistor 2kΩ Equivalent & Substitute Parts

Part Overview

The GL202F9J is an NTC thermistor manufactured by Littelfuse Inc., featuring a 2kΩ resistance at 25°C with a B25/85 value of 3499K. This component is classified as a temperature sensor in bead form with glass packaging and through-hole mounting. The product is currently obsolete, making identification of suitable substitute components essential for ongoing applications and new designs requiring equivalent thermal sensing capabilities.

Substiute Parts

GL202F9J

Littelfuse Inc.In Stock: 800GL202F9J Datasheet

Current PartRFQ

120-202EAJ-Q01

Honeywell Sensing and Productivity SolutionsIn Stock: 945120-202EAJ-Q01 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GL202F9J is determined by the following critical parameters:

• Nominal Resistance: 2kΩ at 25°C (primary electrical characteristic)
• B-Value (B25/85): 3499K (thermal response characteristic)
• Operating Temperature Range: -55°C to 300°C minimum
• Package Configuration: Glass-encapsulated thermistor form factor
• Mounting Compatibility: Physical lead configuration suitable for circuit integration

The substitute part 120-202EAJ-Q01 maintains the core electrical specifications (2kΩ nominal resistance and comparable B-value of 3518K) and operates within the required temperature range. While the physical form differs (cylindrical probe versus bead), both are glass-encapsulated NTC thermistors with equivalent thermal sensing performance.

Parameter Comparison

Engineering Selection Recommendations

The 120-202EAJ-Q01 serves as a functional substitute for the obsolete GL202F9J based on the following engineering criteria:

Electrical Equivalence: Both components maintain 2kΩ nominal resistance at 25°C with B-values within 0.54% variance (3499K versus 3518K), ensuring comparable thermal response characteristics in temperature sensing applications.

Temperature Performance: The 120-202EAJ-Q01 extends the lower operating limit to -60°C compared to the GL202F9J's -55°C, providing enhanced performance in colder environments while maintaining the 300°C upper limit.

Compliance Status: The 120-202EAJ-Q01 is RoHS Compliant and carries Active product status, ensuring long-term availability and regulatory alignment for new designs and production continuity.

Physical Integration Considerations: The substitute features a cylindrical probe form factor with 1.25" leads versus the bead configuration with 1.00" leads. Circuit board layout and thermal coupling requirements must be evaluated to confirm mechanical compatibility in the target application.

Frequently Asked Questions (FAQ)

Q: Can the 120-202EAJ-Q01 directly replace the GL202F9J in existing designs?

A: Electrical substitution is valid based on matching 2kΩ resistance and comparable B-values. However, physical form factor differences (bead versus cylindrical probe) and lead length variation (1.00" versus 1.25") require verification of mounting compatibility and thermal coupling characteristics in the specific application.

Q: What is the significance of the B-value difference (3499K versus 3518K)?

A: The B-value determines the thermistor's thermal response curve. The 0.54% variance between components is negligible for most temperature sensing applications and falls within typical measurement tolerances for NTC thermistor performance.

Q: Why does the GL202F9J show obsolete status?

A: Obsolete status indicates the component is no longer manufactured by Littelfuse Inc. The 120-202EAJ-Q01 from Honeywell provides equivalent electrical performance with active production status and current availability.

Q: How does the resistance tolerance difference affect circuit design?

A: The GL202F9J specifies ±5% tolerance while the 120-202EAJ-Q01 specifies ±20%. Applications requiring tighter resistance control should account for the wider tolerance band of the substitute or implement calibration procedures to maintain performance specifications.

Q: Are there packaging or moisture sensitivity differences?

A: The GL202F9J lists moisture sensitivity as Not Applicable. The 120-202EAJ-Q01 specifies MSL 1 (Unlimited), indicating superior moisture resistance. Both components feature glass encapsulation suitable for standard industrial environments.