SPSX151M04R Equivalent & Substitute Parts

Part Overview

The SPSX151M04R is a 150 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, indicating that direct procurement from the original manufacturer is no longer available. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for applications utilizing this capacitor specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	SPSX151M04R
Manufacturer	Cornell Dubilier Electronics (CDE)
Capacitance	150 µF
Voltage Rating	4 V
Tolerance	±20%
Type	Aluminum Polymer
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
ESR (Equivalent Series Resistance)	9 mOhm
Lifetime @ Temperature	1000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Ripple Current @ 100 kHz	3 A
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SPSX151M04R are classified based on electrical and mechanical compatibility within the aluminum polymer capacitor category. The primary substitution criteria are:

Critical Parameters for Substitution:

Capacitance: 150 µF (exact match required)
Voltage Rating: 4 V minimum (equal or higher voltage rating acceptable)
Package / Case: 2917 (7343 Metric) (physical footprint compatibility)
Mounting Type: Surface Mount (PCB assembly compatibility)
Type: Aluminum Polymer (electrochemical compatibility)

Secondary Parameters Affecting Performance:

ESR (Equivalent Series Resistance): Lower values indicate improved high-frequency performance
Lifetime @ Temperature: Higher values indicate extended operational life
Ripple Current @ 100 kHz: Higher values indicate greater current handling capability
Operating Temperature Range: Wider ranges provide greater design flexibility

Substitute parts are grouped into two categories:

Direct Substitutes (EEF-SX0G151ER): Identical electrical specifications with improved performance characteristics (lower ESR, extended lifetime, higher ripple current capacity) and active product status.

Compatible Substitutes (EEF-SX0J151ER, EEF-CX0G151R, EEF-SX0G151E7): Meet core electrical requirements with variations in voltage rating, ESR, or ripple current specifications. These parts maintain package compatibility and are suitable for applications where the specified parameter variations do not conflict with circuit requirements.

Similar Substitutes (ECASD40G157M016K00): Maintain capacitance, voltage, and package specifications but exhibit higher ESR and lower ripple current capacity. This part is also obsolete and should be considered only when other active alternatives are unavailable.

Parameter Comparison

Parameter	SPSX151M04R (Main)	EEF-SX0G151ER	EEF-SX0J151ER	ECASD40G157M016K00	EEF-CX0G151R	EEF-SX0G151E7
Manufacturer	CDE	Panasonic	Panasonic	Murata	Panasonic	Panasonic
Capacitance	150 µF	150 µF	150 µF	150 µF	150 µF	150 µF
Voltage Rating	4 V	4 V	6.3 V	4 V	4 V	4 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%
Type	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer
Package / Case	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
ESR (mOhm)	9	9	9	16	15	7
Lifetime @ 105°C	1000 Hrs	2000 Hrs	2000 Hrs	1000 Hrs	2000 Hrs	2000 Hrs
Operating Temperature Range	-40°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-40°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Ripple Current @ 100 kHz (A)	3	6.3	6.3	2.1	5.1	7
Product Status	Obsolete	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Height - Seated (Max)	0.083" (2.10 mm)	0.079" (2.00 mm)	0.079" (2.00 mm)	0.075" (1.90 mm)	0.075" (1.90 mm)	0.079" (2.00 mm)

Engineering Selection Recommendations

Primary Recommendation: EEF-SX0G151ER

The EEF-SX0G151ER manufactured by Panasonic Electronic Components is the optimal substitute for the SPSX151M04R. This part maintains identical electrical specifications (150 µF, 4 V, ±20% tolerance, 9 mOhm ESR) while providing enhanced performance characteristics. The EEF-SX0G151ER features doubled lifetime rating (2000 Hrs @ 105°C versus 1000 Hrs), doubled ripple current capacity (6.3 A @ 100 kHz versus 3 A), and an extended operating temperature range (-55°C ~ 105°C versus -40°C ~ 105°C). The part is currently in active production status, ensuring long-term availability and supply chain stability. ROHS3 compliance and REACH unaffected status align with the original part's regulatory requirements.

Secondary Recommendation: EEF-SX0G151E7

The EEF-SX0G151E7 is suitable for applications requiring superior high-frequency performance. This Panasonic part maintains the 150 µF, 4 V specification with reduced ESR (7 mOhm versus 9 mOhm) and the highest ripple current capacity among available substitutes (7 A @ 100 kHz). The extended lifetime (2000 Hrs @ 105°C) and active product status support long-term deployment. The lower ESR reduces thermal dissipation and improves efficiency in ripple-current-intensive applications.

Alternative Recommendation: EEF-CX0G151R

The EEF-CX0G151R provides a balanced alternative with moderate ESR reduction (15 mOhm) and enhanced ripple current handling (5.1 A @ 100 kHz). This part is suitable for applications where the performance improvements of the EEF-SX0G151E7 are not required but where the extended lifetime and wider operating temperature range of active parts are beneficial.

Higher Voltage Option: EEF-SX0J151ER

The EEF-SX0J151ER is a 6.3 V rated variant maintaining the 150 µF capacitance and identical ESR (9 mOhm). This part is appropriate for circuits where voltage margin is desired or where the 4 V rating presents supply stability concerns. The higher voltage rating does not compromise performance in 4 V applications and provides additional design safety margin.

Not Recommended: ECASD40G157M016K00

The Murata ECASD40G157M016K00 is classified as obsolete and exhibits degraded performance characteristics compared to the main part (16 mOhm ESR, 2.1 A ripple current @ 100 kHz, 1000 Hrs lifetime). This part should be selected only when active alternatives are unavailable and supply chain constraints necessitate its use.

Frequently Asked Questions (FAQ)

Q: Can the EEF-SX0G151ER be used as a direct replacement for the SPSX151M04R without circuit modification?

A: Yes. The EEF-SX0G151ER maintains identical capacitance (150 µF), voltage rating (4 V), tolerance (±20%), and ESR (9 mOhm) specifications. The package footprint (2917 / 7343 Metric) and mounting type (Surface Mount) are identical. The part can be substituted without circuit redesign. The improved performance characteristics (extended lifetime, higher ripple current capacity, wider operating temperature range) provide additional design margin without introducing incompatibility.

Q: What is the significance of ESR differences among substitute parts?

A: Equivalent Series Resistance (ESR) directly affects capacitor thermal dissipation and high-frequency performance. Lower ESR values reduce heat generation under ripple current conditions and improve impedance characteristics at high frequencies. The SPSX151M04R specifies 9 mOhm ESR. The EEF-SX0G151E7 (7 mOhm) provides improved performance for ripple-current-intensive applications. The ECASD40G157M016K00 (16 mOhm) exhibits degraded performance and should be avoided unless supply constraints mandate its use.

Q: Are all substitute parts physically compatible with the original PCB layout?

A: All substitute parts share the identical 2917 (7343 Metric) package and surface mount land pattern (0.287" L x 0.169" W / 7.30 mm x 4.30 mm). Physical compatibility is confirmed. However, seated height varies slightly among parts: SPSX151M04R (2.10 mm), EEF-SX0G151ER and EEF-SX0G151E7 (2.00 mm), EEF-CX0G151R and ECASD40G157M016K00 (1.90 mm). These variations are within typical PCB assembly tolerances and do not affect functionality. Verify clearance in applications with height-constrained layouts.

Q: Why is the EEF-SX0J151ER (6.3 V) listed as a substitute for a 4 V part?

A: Higher voltage-rated capacitors are electrically compatible with lower voltage applications. A 6.3 V rated capacitor can safely operate at 4 V without performance degradation. The higher voltage rating provides additional design margin and may improve reliability in applications subject to voltage transients or supply ripple. The EEF-SX0J151ER maintains identical capacitance (150 µF) and ESR (9 mOhm), making it a valid substitute when voltage margin is desired.

Q: What is the impact of the extended operating temperature range (-55°C ~ 105°C) in active substitute parts?

A: The SPSX151M04R specifies -40°C ~ 105°C operation. Active substitute parts (Panasonic EEF series) extend the lower temperature limit to -55°C. This expanded range provides design flexibility for applications subject to cold environment exposure or thermal cycling. The extended range does not affect performance in the original -40°C ~ 105°C specification window and represents an unconditional improvement.

Q: How does the lifetime rating (1000 Hrs vs. 2000 Hrs @ 105°C) affect part selection?

A: Lifetime rating indicates the expected operational duration at maximum rated temperature and voltage before capacitance degradation exceeds specified tolerance limits. The SPSX151M04R specifies 1000 Hrs @ 105°C. Active Panasonic substitutes (EEF-SX0G151ER, EEF-SX0J151ER, EEF-CX0G151R, EEF-SX0G151E7) provide doubled lifetime (2000 Hrs @ 105°C), indicating superior long-term reliability. For applications requiring extended operational life or continuous high-temperature operation, the extended lifetime rating is advantageous.

Q: Is the ECASD40G157M016K00 a viable substitute despite its obsolete status?

A: The ECASD40G157M016K00 meets core electrical specifications (150 µF, 4 V, ±20% tolerance, 2917 package) but exhibits degraded performance (16 mOhm ESR, 2.1 A ripple current, 1000 Hrs lifetime) and is classified as obsolete. This part should be selected only when active alternatives are unavailable. Preference should be given to active Panasonic parts (EEF-SX0G151ER, EEF-SX0J151ER, EEF-CX0G151R, EEF-SX0G151E7) to ensure long-term supply chain stability and superior performance characteristics.

Q: What compliance certifications are maintained across all substitute parts?

A: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original SPSX151M04R regulatory requirements. These certifications confirm compliance with European Union Restriction of Hazardous Substances and Registration, Evaluation, Authorization and Restriction of Chemicals regulations. No additional compliance verification is required when substituting parts within this group.

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