ERT-D2FFL400S NTC Thermistor Equivalent & Substitute Parts

Part Overview

The ERT-D2FFL400S is an NTC thermistor manufactured by Panasonic Electronic Components, rated at 40 ohms resistance at 25°C with a B25/50 value of 3200K. This through-hole disc thermistor (5mm) is designed for temperature sensing applications within the -30°C to 60°C operating range with a maximum power dissipation of 400 mW. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design requirements and component sourcing.

Substiute Parts

ERT-D2FFL400S

Panasonic Electronic ComponentsIn Stock: 1035ERT-D2FFL400S Datasheet

Current PartRFQ

ERT-J1VA400J

Panasonic Electronic ComponentsIn Stock: 1053ERT-J1VA400J Datasheet

SimilarRFQ

MF11-0004005

CanthermIn Stock: 1137MF11-0004005 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ERT-D2FFL400S is determined by the following critical parameters:

• Resistance value at 25°C: 40 ohms (exact match required)
• B-value characteristics: B25/50 range within acceptable thermal response tolerance
• Operating temperature range: Must accommodate or exceed the original -30°C to 60°C specification
• Power dissipation capability: Must support or exceed 400 mW requirement
• Mounting compatibility: Through-hole or surface-mount options based on application redesign feasibility

The identified substitute parts maintain the core 40-ohm resistance specification and operate within compatible temperature ranges, though with variations in B-value, power rating, and form factor.

Parameter Comparison

Engineering Selection Recommendations

ERT-J1VA400J (Panasonic Electronic Components)

This substitute is an active product with improved resistance tolerance (±5% versus ±15%) and extended operating temperature range (-40°C to 125°C). However, it is a surface-mount 0603 component, requiring PCB redesign if the original through-hole mounting is mandatory. The maximum power dissipation is 100 mW, which is lower than the original 400 mW specification. The B25/50 value of 2800K differs from the original 3200K, resulting in different thermal response characteristics. This option is suitable for applications where PCB redesign is feasible and lower power dissipation is acceptable.

MF11-0004005 (Cantherm)

This substitute maintains through-hole mounting compatibility and offers superior power dissipation (500 mW) and extended operating temperature range (-55°C to 125°C). The B25/50 value of 2950K is closer to the original 3200K specification compared to the ERT-J1VA400J. Resistance tolerance is ±5%, providing tighter control than the original ±15%. This option is recommended for applications requiring through-hole mounting and higher thermal stability across extended temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can the ERT-J1VA400J be used as a direct replacement for the ERT-D2FFL400S?

A: The ERT-J1VA400J shares the same 40-ohm resistance specification and is manufactured by the same supplier. However, it is a surface-mount 0603 component versus the through-hole disc format of the original. Additionally, its maximum power dissipation of 100 mW is significantly lower than the original 400 mW. Substitution requires PCB redesign and verification that the application does not exceed 100 mW power dissipation.

Q: What is the significance of the B-value difference between these parts?

A: The B-value determines the thermistor's thermal response curve. The original ERT-D2FFL400S has a B25/50 of 3200K, while substitutes range from 2800K to 2950K. These differences affect temperature measurement accuracy and response speed. Applications with strict thermal response requirements should evaluate whether the B-value variation is acceptable for their specific use case.

Q: Is the MF11-0004005 a better choice than the ERT-J1VA400J?

A: The MF11-0004005 offers advantages in through-hole mounting compatibility, higher power dissipation (500 mW), and a B-value closer to the original specification (2950K versus 2800K). The ERT-J1VA400J is suitable only if PCB redesign to surface-mount is feasible and power dissipation does not exceed 100 mW. Selection depends on specific application constraints.

Q: Are these substitutes RoHS compliant?

A: The ERT-J1VA400J is ROHS3 compliant. The MF11-0004005 is ROHS3 compliant and REACH unaffected. Both substitutes meet modern environmental compliance standards.

Q: What is the impact of the extended operating temperature range on substitutes?

A: Both substitutes extend the operating temperature range to -40°C to 125°C (or -55°C to 125°C for the MF11-0004005), compared to the original -30°C to 60°C. This provides greater flexibility for applications operating in wider temperature environments. However, the thermal response characteristics (B-value) differ, which may affect accuracy at temperature extremes.