ESRH121M04B Equivalent & Substitute Parts

Part Overview

The ESRH121M04B is a 120 µF, 4 V aluminum polymer capacitor manufactured by Cornell Dubilier Electronics (CDE) in the 2917 (7343 Metric) surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part delivers 15 mOhm equivalent series resistance with a 1000-hour lifetime rating at 105°C, serving general-purpose applications requiring compact form factors and low impedance characteristics.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	120	µF	Critical - must match exactly
Voltage Rating	4	V	Critical - must match or exceed
Type	Aluminum Polymer	—	Critical - defines electrical behavior
Package / Case	2917 (7343 Metric)	—	Critical - determines PCB compatibility
ESR	15	mOhm	Important - affects ripple current handling
Tolerance	±20%	—	Important - defines capacitance accuracy
Operating Temperature Range	-55 to 105	°C	Important - defines thermal limits
Mounting Type	Surface Mount	—	Critical - assembly process compatibility

Substitute Part Grouping Explanation

Substitution of the ESRH121M04B is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

Capacitance value: 120 µF (exact match required)
Voltage rating: 4 V (substitute must equal or exceed)
Dielectric type: Aluminum polymer (maintains electrical performance characteristics)
Package designation: 2917 (7343 Metric) (ensures PCB land pattern compatibility)
Mounting technology: Surface mount (maintains assembly process compatibility)

Secondary Compatibility Parameters:

ESR: 15 mOhm (substitute must not exceed this value to maintain ripple current performance)
Tolerance: ±20% (substitute must match or be tighter)
Operating temperature range: -55°C to 105°C (substitute must cover or exceed this range)
RoHS3 compliance: Required for regulatory alignment

The substitute part EEF-CS0G121R meets all critical matching parameters and demonstrates improved performance characteristics in secondary parameters, making it a direct functional equivalent.

Parameter Comparison

Parameter	ESRH121M04B (CDE)	EEF-CS0G121R (Panasonic)	Match Status
Capacitance	120 µF	120 µF	Exact Match
Voltage Rating	4 V	4 V	Exact Match
Type	Aluminum Polymer	Aluminum Polymer	Exact Match
Tolerance	±20%	±20%	Exact Match
ESR @ 100 kHz	15 mOhm	15 mOhm	Exact Match
Operating Temperature	-55°C to 105°C	-55°C to 105°C	Exact Match
Package / Case	2917 (7343 Metric)	2917 (7343 Metric)	Exact Match
Mounting Type	Surface Mount	Surface Mount	Exact Match
Size / Dimension	0.287" L x 0.169" W (7.30mm x 4.30mm)	0.287" L x 0.169" W (7.30mm x 4.30mm)	Exact Match
Height - Seated (Max)	0.110" (2.80mm)	0.047" (1.20mm)	Substitute Lower
Lifetime @ 105°C	1000 Hrs	2000 Hrs	Substitute Superior
Ripple Current @ 100 kHz	2.5 A	5.1 A	Substitute Superior
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact Match
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The EEF-CS0G121R from Panasonic Electronic Components is a direct functional substitute for the obsolete ESRH121M04B. Selection is based on the following engineering criteria:

Electrical Equivalence: Both parts deliver identical capacitance (120 µF), voltage rating (4 V), ESR (15 mOhm), and tolerance (±20%). Electrical performance in circuit applications is functionally equivalent.

Physical Compatibility: Both components utilize the 2917 (7343 Metric) surface mount package with identical land pattern dimensions (0.287" L x 0.169" W). PCB layout modifications are not required. The substitute part features a reduced seated height (0.047" versus 0.110"), which presents no compatibility issues and may provide clearance advantages in space-constrained designs.

Thermal and Reliability Performance: The substitute part exceeds the original specification with 2000-hour lifetime at 105°C compared to 1000 hours, and supports 5.1 A ripple current at 100 kHz versus 2.5 A. These improvements enhance system reliability without introducing design changes.

Regulatory Compliance: Both parts maintain ROHS3 compliance. The substitute part carries REACH Unaffected status, confirming regulatory alignment for global applications.

Product Availability: The substitute part holds active product status with 5256 units in stock, ensuring supply continuity for production and design support activities.

Frequently Asked Questions (FAQ)

Q: Can the EEF-CS0G121R replace the ESRH121M04B in existing designs without PCB modifications?

A: Yes. Both parts share identical land pattern dimensions and the 2917 (7343 Metric) surface mount package. No PCB layout changes are required. The reduced height of the substitute part (0.047" versus 0.110") presents no compatibility concerns.

Q: Are the electrical characteristics identical between these two parts?

A: Yes, for the critical parameters. Capacitance (120 µF), voltage rating (4 V), ESR (15 mOhm), tolerance (±20%), and operating temperature range (-55°C to 105°C) are identical. The substitute part provides superior ripple current handling (5.1 A versus 2.5 A at 100 kHz) and extended lifetime (2000 hours versus 1000 hours at 105°C).

Q: What is the primary reason for substitution?

A: The ESRH121M04B is classified as obsolete. The EEF-CS0G121R maintains active product status, ensuring long-term availability and supply chain continuity.

Q: Does the substitute part meet the same regulatory requirements?

A: Yes. Both parts are ROHS3 compliant. The substitute part additionally carries REACH Unaffected status, confirming compliance with international environmental regulations.

Q: Are there any height clearance considerations?

A: The substitute part is physically shorter (0.047" seated height versus 0.110"). This reduction may provide additional clearance in designs with height constraints and presents no compatibility issues.

Q: What packaging options are available for the substitute part?

A: The EEF-CS0G121R is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly operations.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message