ESRH121M04R Equivalent & Substitute Parts

Part Overview

The ESRH121M04R is a 120 µF, 4 V aluminum polymer surface mount capacitor manufactured by Cornell Dubilier Electronics (CDE) in the 2917 (7343 Metric) package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -55°C to 105°C with an equivalent series resistance (ESR) of 15 mOhm and supports a ripple current of 2.5 A at 100 kHz.

Substiute Parts

ESRH121M04R

Cornell Dubilier Electronics (CDE)In Stock: 943ESRH121M04R Datasheet

Current PartRFQ

A700D127M004ATE018

KEMETIn Stock: 1935A700D127M004ATE018 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ESRH121M04R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 120 µF
• Voltage Rating: 4 V
• Tolerance: ±20%
• Package / Case: 2917 (7343 Metric)
• Mounting Type: Surface Mount
• Type: Aluminum Polymer

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): Substitute parts may have ESR values within acceptable operational limits for the application
• Operating Temperature Range: Substitute parts may extend the upper or lower temperature limits
• Ripple Current @ 100 kHz: Substitute parts may have higher ripple current ratings
• Height - Seated (Max): Minor dimensional variations within package specification tolerances
• Product Status: Active parts are preferred over obsolete parts

The KEMET A700D127M004ATE018 meets all mandatory matching parameters and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The KEMET A700D127M004ATE018 is a direct functional equivalent to the obsolete ESRH121M04R. Both components share identical electrical specifications for capacitance, voltage rating, tolerance, and package configuration. The substitute part offers the following advantages:

Product Status: The A700D127M004ATE018 is an active product with confirmed availability, eliminating supply chain risk associated with the obsolete ESRH121M04R.

Compliance: Both parts maintain ROHS3 compliance and identical moisture sensitivity levels, ensuring regulatory and manufacturing process compatibility.

Thermal Performance: The KEMET substitute extends the maximum operating temperature from 105°C to 125°C, providing enhanced thermal margin in applications subject to elevated ambient conditions.

Electrical Performance: The A700D127M004ATE018 exhibits a 3 mOhm increase in ESR (18 mOhm versus 15 mOhm) and a 1.2 A increase in ripple current capacity (3.7 A versus 2.5 A at 100 kHz). These variations remain within acceptable operational parameters for general purpose applications.

Physical Compatibility: Both parts utilize identical surface mount land sizes and the 2917 (7343 Metric) package. The substitute part height of 3.10 mm (maximum seated) represents a 0.30 mm increase over the original part, which remains within standard PCB assembly tolerances.

Frequently Asked Questions (FAQ)

Q: Can the KEMET A700D127M004ATE018 be used as a direct replacement for the ESRH121M04R in existing designs?

A: Yes. Both parts share identical capacitance (120 µF), voltage rating (4 V), tolerance (±20%), package type (2917 / 7343 Metric), and mounting configuration (surface mount). The substitute part is electrically and mechanically compatible with the original design.

Q: What is the significance of the 3 mOhm ESR difference between the two parts?

A: The KEMET substitute exhibits an ESR of 18 mOhm compared to the original 15 mOhm. This 20% increase in series resistance remains within acceptable limits for general purpose applications. Applications requiring precise ESR specifications should evaluate this parameter against circuit requirements.

Q: Does the increased ripple current rating of the KEMET part affect compatibility?

A: No. The A700D127M004ATE018 supports 3.7 A ripple current at 100 kHz, compared to 2.5 A for the original part. Higher ripple current capacity does not create compatibility issues and provides additional thermal margin in the application.

Q: Are there physical space constraints due to the height difference?

A: The KEMET substitute has a maximum seated height of 3.10 mm, compared to 2.80 mm for the original part. This 0.30 mm difference is within standard PCB assembly tolerances. Verify clearance in applications with height-constrained layouts.

Q: Do both parts require identical handling and storage procedures?

A: Yes. Both parts maintain Moisture Sensitivity Level 3 (168 Hours) classification. Identical moisture control, storage temperature, and handling procedures apply to both components.

Q: Is the extended operating temperature range of the KEMET part a requirement or an advantage?

A: The extended range (-55°C to 125°C for the substitute versus -55°C to 105°C for the original) is an advantage that provides additional thermal margin. It is not a requirement for applications operating within the original temperature specification.

Q: Are there any compliance or certification differences between the two parts?

A: No. Both parts are ROHS3 compliant and carry identical regulatory classifications (ECCN: EAR99, HTSUS: 8532.22.0020).