GL202F5J NTC Thermistor 2kΩ Equivalent & Substitute Parts

Part Overview

The GL202F5J 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 part is currently obsolete, making identification of suitable substitutes essential for ongoing applications and design continuity.

Substiute Parts

GL202F5J

Littelfuse Inc.In Stock: 772GL202F5J 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 GL202F5J is determined by the following critical parameters:

• Resistance value at 25°C (2kΩ nominal)
• B-value thermal coefficient (B25/85 range: 3499K to 3518K)
• Operating temperature range capability (-55°C minimum to 300°C maximum)
• Package material (glass construction)
• Mounting configuration compatibility

The substitute part 120-202EAJ-Q01 meets these core electrical specifications. However, physical form factor differs: the GL202F5J uses a bead configuration with through-hole mounting, while the 120-202EAJ-Q01 employs a cylindrical probe with free-hanging mounting. This distinction affects mechanical integration and circuit board layout considerations.

Parameter Comparison

Engineering Selection Recommendations

The 120-202EAJ-Q01 serves as an electrical equivalent for the GL202F5J based on matching resistance and thermal coefficient specifications. Selection of this substitute requires evaluation of the following factors:

• The GL202F5J is obsolete; the 120-202EAJ-Q01 maintains active product status with ongoing manufacturer support
• The 120-202EAJ-Q01 is RoHS compliant, whereas RoHS status for the GL202F5J is not specified
• Resistance tolerance widens from ±5% to ±20%, affecting circuit calibration requirements
• Physical form factor change from bead to cylindrical probe necessitates mechanical redesign of mounting and thermal coupling interfaces
• Lead wire length increases from 25.40mm to 31.80mm, requiring circuit board layout adjustment
• Operating temperature range extends to -60°C minimum, providing enhanced low-temperature capability

Frequently Asked Questions (FAQ)

Q: Can the 120-202EAJ-Q01 directly replace the GL202F5J without circuit modification?

A: Electrical substitution is possible due to matching 2kΩ resistance and comparable B-values (3499K vs. 3518K). However, mechanical redesign is required due to different package forms: the GL202F5J uses a through-hole bead mount, while the 120-202EAJ-Q01 uses free-hanging cylindrical probe mounting. Circuit board layout and thermal coupling methods must be re-evaluated.

Q: What is the significance of the B25/85 value difference (3499K vs. 3518K)?

A: The B-value defines the thermistor's thermal sensitivity. The 19K difference between parts represents approximately 0.5% variation, which is negligible for most temperature sensing applications within the specified operating range.

Q: Does the wider resistance tolerance of the 120-202EAJ-Q01 (±20% vs. ±5%) affect circuit performance?

A: Tolerance widening from ±5% to ±20% increases component variation. Applications requiring tight resistance accuracy at 25°C may need circuit recalibration or selection of tighter tolerance batches from the manufacturer.

Q: Are both parts suitable for the full -55°C to 300°C temperature range?

A: The GL202F5J operates from -55°C to 300°C. The 120-202EAJ-Q01 extends the lower limit to -60°C, providing additional low-temperature margin. Both parts support the full 300°C upper limit.

Q: What mounting considerations apply when switching from the GL202F5J to the 120-202EAJ-Q01?

A: The GL202F5J bead form with through-hole mounting integrates directly into circuit boards. The 120-202EAJ-Q01 cylindrical probe with free-hanging configuration requires external mechanical support and thermal coupling design. Lead wire length increases from 25.40mm to 31.80mm, affecting circuit routing and thermal response characteristics.