Equivalent & Substitute Parts for 4-1879064-1

Part Overview

The TE Connectivity 4-1879064-1 is a 4.7 µF molded tantalum capacitor rated at 25 V with 600 mOhm equivalent series resistance in a 2312 (6032 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing production and maintenance applications. Substitute parts must maintain electrical and mechanical compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Capacitance	4.7 µF
Tolerance	±10%
Voltage - Rated	25 V
Type	Molded Tantalum
ESR (Equivalent Series Resistance)	600 mOhm
Operating Temperature Range	-55°C to 125°C
Mounting Type	Surface Mount
Package / Case	2312 (6032 Metric)
Size / Dimension	0.236" L x 0.126" W (6.00 mm x 3.20 mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical compatibility with the main part 4-1879064-1:

Direct Substitutes (Same Voltage Rating - 25 V): Parts maintaining the 25 V rated voltage, 4.7 µF capacitance, ±10% tolerance, 2312 package, and -55°C to 125°C operating temperature range. These parts are electrically and mechanically interchangeable with the original component.

Upgrade Substitutes (Higher Voltage Rating - 35 V): Parts with elevated voltage ratings (35 V) while maintaining all other electrical parameters. These provide enhanced voltage margin and are physically compatible within the same 2312 package footprint.

Similar Substitutes (Variant ESR or Packaging): Parts with identical capacitance, voltage, tolerance, and package specifications but differing ESR values or packaging formats. These maintain full electrical compatibility while offering alternative performance characteristics or supply chain options.

The following parameters determine substitution eligibility:

Capacitance: 4.7 µF (fixed requirement)
Tolerance: ±10% (fixed requirement)
Voltage Rating: 25 V minimum (upgrades to 35 V permitted)
Package / Case: 2312 (6032 Metric) (fixed requirement)
Operating Temperature: -55°C to 125°C (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)
ESR: 600 mOhm nominal (variants permitted within similar classification)

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage (V)	ESR (mOhm)	Package	Product Status	RoHS Status
4-1879064-1	TE Connectivity	4.7 µF	±10%	25	600	2312	Obsolete	Not specified
T494C475K025AH	KEMET	4.7 µF	±10%	25	600	2312	Active	RoHS non-compliant
T494C475K025AT	KEMET	4.7 µF	±10%	25	600	2312	Active	ROHS3 Compliant
T495C475K035ATE600	KEMET	4.7 µF	±10%	35	600	2312	Active	ROHS3 Compliant
TPSC475K035R0600	KYOCERA AVX	4.7 µF	±10%	35	600	2312	Active	ROHS3 Compliant
TR3C475K035C0600	Vishay Sprague	4.7 µF	±10%	35	600	2312	Active	ROHS3 Compliant
293D475X9025C2TE3	Vishay Sprague	4.7 µF	±10%	25	2000	2312	Active	ROHS3 Compliant
593D475X9025C2TE3	Vishay Sprague	4.7 µF	±10%	25	525	2312	Active	ROHS3 Compliant
T491C475K025AH	KEMET	4.7 µF	±10%	25	2400	2312	Active	RoHS non-compliant
T491C475K025AT	KEMET	4.7 µF	±10%	25	2400	2312	Active	ROHS3 Compliant
TAJC475K025RNJ	KYOCERA AVX	4.7 µF	±10%	25	Not specified	2312	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Recommended for Pin-Compatible Replacement):

T494C475K025AT is the primary direct substitute. This KEMET part maintains identical electrical specifications (4.7 µF, ±10%, 25 V, 600 mOhm ESR) and mechanical compatibility (2312 package, surface mount). The part is active and ROHS3 compliant, addressing the obsolescence of the original component while meeting current regulatory requirements.

T494C475K025AH provides equivalent electrical and mechanical specifications but carries RoHS non-compliant status, limiting suitability for new designs subject to RoHS regulations.

Upgrade Substitutes (Higher Voltage Margin):

T495C475K035ATE600, TPSC475K035R0600, and TR3C475K035C0600 are upgrade options with 35 V ratings. All three maintain 4.7 µF capacitance, ±10% tolerance, 600 mOhm ESR, and 2312 package compatibility. All are active and ROHS3 compliant. These parts provide enhanced voltage headroom for applications requiring additional safety margin.

Similar Substitutes (Alternative ESR Characteristics):

593D475X9025C2TE3 (Vishay Sprague, 525 mOhm ESR) and 293D475X9025C2TE3 (Vishay Sprague, 2000 mOhm ESR) maintain 25 V rating and 2312 package but offer different ESR profiles. Selection depends on circuit requirements for ripple current handling and thermal performance.

T491C475K025AT (KEMET, 2400 mOhm ESR) provides ROHS3 compliance with significantly higher ESR, suitable for applications where ESR variation is acceptable.

TAJC475K025RNJ (KYOCERA AVX) offers 25 V compatibility with ROHS3 compliance and highest inventory availability (2220 pcs), though ESR specification is not provided.

Frequently Asked Questions (FAQ)

Q: Can I use a 35 V rated substitute in place of the 25 V original part?

A: Yes. Parts rated for 35 V (T495C475K035ATE600, TPSC475K035R0600, TR3C475K035C0600) are electrically and mechanically compatible. The higher voltage rating provides additional safety margin without affecting circuit operation at 25 V or below.

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

A: ESR (Equivalent Series Resistance) affects ripple current handling and thermal performance. The original 4-1879064-1 specifies 600 mOhm. Substitutes with higher ESR (2400 mOhm, 2000 mOhm) generate more heat under AC ripple conditions. Substitutes with lower ESR (525 mOhm) provide improved ripple current performance. Selection depends on circuit ripple current requirements.

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

A: Yes. All listed substitutes use the 2312 (6032 Metric) surface mount package with identical dimensions (0.236" L x 0.126" W, 6.00 mm x 3.20 mm). Maximum seated heights vary slightly (2.70 mm to 2.80 mm), remaining within standard PCB assembly tolerances.

Q: What is the difference between RoHS compliant and RoHS non-compliant parts?

A: ROHS3 compliant parts meet Restriction of Hazardous Substances regulations and are required for products sold in regulated markets. RoHS non-compliant parts (T494C475K025AH, T491C475K025AH) contain restricted substances and are unsuitable for new designs subject to RoHS requirements.

Q: Which substitute offers the best availability?

A: TAJC475K025RNJ (KYOCERA AVX) has the highest inventory at 2220 pcs. T494C475K025AT (KEMET) provides 1534 pcs with ROHS3 compliance and identical electrical specifications to the original part.

Q: Can I mix different substitute parts in the same design?

A: All listed substitutes are electrically compatible within the same circuit. However, using identical part numbers across a design simplifies procurement, documentation, and field service. If mixing is necessary, verify that ESR and voltage rating variations do not affect circuit performance.

Q: What packaging formats are available for these substitutes?

A: Substitutes are supplied in Tape & Reel (TR), Cut Tape (CT), or Digi-Reel® formats. Packaging selection depends on production volume and assembly equipment compatibility. Electrical specifications remain identical across packaging formats.

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