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ERT-D2FGL301S NTC Thermistor Equivalent & Substitute Parts
Part Overview
The Panasonic ERT-D2FGL301S is an NTC thermistor with 300Ω resistance at 25°C, designed for temperature sensing applications requiring a negative temperature coefficient characteristic. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production, maintenance, and design updates. The disc configuration with 5mm diameter and through-hole mounting provides standard thermal sensing functionality across industrial and consumer applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance @ 25°C | 300Ω |
| Resistance Tolerance | ±15% |
| B Value (25/50) | 3900K |
| Operating Temperature Range | -30°C ~ 60°C |
| Power Dissipation (Max) | 400 mW |
| Mounting Type | Through Hole |
| Package Type | Disc 5mm |
| Lead Wire Length | 1.18" (30.00mm) |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the ERT-D2FGL301S is determined by the following critical parameters:
- Resistance value at 25°C must be 300Ω
- Mounting type must be through-hole configuration
- Package type must be disc format
- Operating temperature range must encompass or exceed the original -30°C ~ 60°C specification
- Power dissipation capability must meet or exceed 400 mW
The substitute parts listed below satisfy these core electrical and mechanical requirements, enabling direct functional replacement in circuit designs. Variations in B value, tolerance, and physical dimensions are acceptable within standard engineering practice for NTC thermistor applications, provided the primary thermal response characteristics remain compatible with the application's temperature sensing requirements.
Parameter Comparison
| Parameter | ERT-D2FGL301S (Panasonic) | MF11-0030005 (Cantherm) | RL2008-187-73-D1 (Amphenol Thermometrics) |
|---|---|---|---|
| Resistance @ 25°C | 300Ω | 300Ω | 300Ω |
| Resistance Tolerance | ±15% | ±5% | ±10% |
| B Value (25/50) | 3900K | 3600K | — |
| B Value (25/85) | — | — | 3468K |
| Operating Temperature Range | -30°C ~ 60°C | -55°C ~ 125°C | -50°C ~ 150°C |
| Power Dissipation (Max) | 400 mW | 500 mW | — |
| Mounting Type | Through Hole | Through Hole | Through Hole |
| Package Type | Disc 5mm | Disc 6.5mm Dia x 5.0mm W | Disc 5.6mm Dia x 4.3mm W |
| Product Status | Obsolete | Active | Active |
| RoHS Status | — | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Both substitute parts are classified as active products with current manufacturing status, ensuring long-term availability and supply chain reliability compared to the obsolete ERT-D2FGL301S.
The MF11-0030005 (Cantherm) offers improved resistance tolerance (±5% versus ±15%) and extended operating temperature range (-55°C ~ 125°C), with ROHS3 compliance and higher power dissipation capability (500 mW). Physical dimensions are slightly larger (6.5mm diameter).
The RL2008-187-73-D1 (Amphenol Thermometrics) provides the widest operating temperature range (-50°C ~ 150°C) with ROHS3 compliance and MSL rating matching the original part. Physical dimensions are closest to the original specification (5.6mm diameter x 4.3mm width). Lead wire length is extended to 1.50" (38.00mm).
Selection between these substitutes depends on specific application requirements regarding tolerance precision, temperature operating range, physical space constraints, and lead wire length compatibility.
Frequently Asked Questions (FAQ)
Q: Can the MF11-0030005 be used as a direct replacement for the ERT-D2FGL301S?
A: Yes. Both components share identical 300Ω resistance at 25°C, through-hole mounting, and disc package configuration. The MF11-0030005 operates across a wider temperature range (-55°C ~ 125°C) and provides superior resistance tolerance (±5%). Physical dimensions differ slightly (6.5mm versus 5mm diameter), requiring verification of PCB layout compatibility.
Q: What is the significance of B value differences between the substitute parts?
A: B value defines the thermal response curve of the NTC thermistor. The original ERT-D2FGL301S specifies B25/50 of 3900K, while the MF11-0030005 provides 3600K and the RL2008-187-73-D1 specifies B25/85 of 3468K. These variations affect temperature measurement accuracy across different temperature ranges. Application-specific thermal response requirements must be evaluated during selection.
Q: Are there PCB layout considerations when substituting these parts?
A: Yes. Physical dimensions vary: the original disc is 5mm, the Cantherm substitute is 6.5mm diameter, and the Amphenol substitute is 5.6mm diameter. Lead wire lengths also differ (30mm, unspecified, and 38mm respectively). PCB hole spacing and component clearance must be verified before implementation.
Q: Do all substitute parts meet RoHS compliance requirements?
A: The MF11-0030005 and RL2008-187-73-D1 are both ROHS3 compliant. The original ERT-D2FGL301S RoHS status is not specified in the provided data. If RoHS compliance is a design requirement, both active substitutes satisfy this criterion.
Q: Which substitute offers the best tolerance specification?
A: The MF11-0030005 provides the tightest resistance tolerance at ±5%, compared to ±10% for the RL2008-187-73-D1 and ±15% for the original part. Superior tolerance improves measurement accuracy and reduces circuit calibration variation.
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