UST1C101MDD Equivalent & Substitute Parts

Part Overview

The UST1C101MDD is a 100 µF, 16 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This part is classified as obsolete, with a rated lifetime of 1000 hours at 105°C. Due to its obsolete status, equivalent substitute parts with improved specifications or active product status are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Capacitance	100 µF
Tolerance	±20%
Voltage - Rated	16 V
Lifetime @ Temperature	1000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Through Hole
Package / Case	Radial, Can
Lead Spacing	0.138" (4.60mm)
Size / Dimension	0.315" Dia (8.00mm)
Height - Seated (Max)	0.315" (8.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UST1C101MDD is determined by the following critical parameters:

Primary Matching Criteria:

Capacitance: 100 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 16 V minimum (equal or higher acceptable)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can (exact match required)
Operating Temperature: -55°C ~ 105°C (minimum requirement)

Secondary Considerations:

Lead Spacing: 0.138" (4.60mm) preferred for direct PCB compatibility
Physical Dimensions: Size and height compatibility with PCB layout
Lifetime @ Temperature: Extended lifetime (2000+ hours) preferred over original 1000 hours
Product Status: Active or Obsolete acceptable; Not For New Designs requires evaluation

Substitute parts are grouped into two categories:

Category A - Direct Footprint Replacements (Lead Spacing 0.138" / 4.60mm): RL81V101MDN1, UVZ1H101MPD

Category B - Alternate Footprint Replacements (Lead Spacing 0.098" / 2.50mm): UPJ1C101MED, UPM1C101MED, UPS1C101MED, UPV1C101MGD, UPW1C101MED

Category C - Surface Mount Alternative: UWT1C101MCL1GB

Category D - Alternative Manufacturer: ECA-1CHG101, ECA-1CHG101I (Panasonic)

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Lifetime @ 105°C	Lead Spacing	Size / Dimension	Height (Max)	Product Status	Type
UST1C101MDD	Nichicon	100 µF	16 V	1000 Hrs	0.138" (4.60mm)	0.315" Dia (8.00mm)	0.315" (8.00mm)	Obsolete	Aluminum Electrolytic
RL81V101MDN1	Nichicon	100 µF	35 V	2000 Hrs	0.138" (4.60mm)	0.315" Dia (8.00mm)	0.354" (9.00mm)	Active	Aluminum - Polymer
UPJ1C101MED	Nichicon	100 µF	16 V	2000 Hrs	0.098" (2.50mm)	0.248" Dia (6.30mm)	0.472" (12.00mm)	Obsolete	Aluminum Electrolytic
UPM1C101MED	Nichicon	100 µF	16 V	2000 Hrs	0.098" (2.50mm)	0.248" Dia (6.30mm)	0.492" (12.50mm)	Obsolete	Aluminum Electrolytic
UPS1C101MED	Nichicon	100 µF	16 V	2000 Hrs	0.098" (2.50mm)	0.248" Dia (6.30mm)	0.492" (12.50mm)	Obsolete	Aluminum Electrolytic
UPV1C101MGD	Nichicon	100 µF	16 V	5000 Hrs	0.098" (2.50mm)	0.248" Dia (6.30mm)	0.492" (12.50mm)	Obsolete	Aluminum Electrolytic
UPW1C101MED	Nichicon	100 µF	16 V	2000 Hrs	0.098" (2.50mm)	0.248" Dia (6.30mm)	0.433" (11.00mm)	Obsolete	Aluminum Electrolytic
UVZ1H101MPD	Nichicon	100 µF	50 V	1000 Hrs	0.138" (4.60mm)	0.315" Dia (8.00mm)	0.512" (13.00mm)	Not For New Designs	Aluminum Electrolytic
UWT1C101MCL1GB	Nichicon	100 µF	16 V	1000 Hrs	N/A	0.248" Dia (6.30mm)	0.213" (5.40mm)	Active	Aluminum Electrolytic - SMD
ECA-1CHG101	Panasonic	100 µF	16 V	1000 Hrs	0.079" (2.00mm)	0.197" Dia (5.00mm)	0.472" (12.00mm)	Active	Aluminum Electrolytic
ECA-1CHG101I	Panasonic	100 µF	16 V	1000 Hrs	0.098" (2.50mm)	0.197" Dia (5.00mm)	0.472" (12.00mm)	Active	Aluminum Electrolytic

Engineering Selection Recommendations

For Direct PCB Footprint Compatibility (No Layout Modification Required):

RL81V101MDN1 is the primary substitute when direct lead spacing (0.138" / 4.60mm) compatibility is required. This part offers improved specifications with 35 V rated voltage, 2000-hour lifetime at 105°C, and active product status. The aluminum-polymer construction provides lower ESR (25 mOhm) compared to the original part. Height increase from 0.315" to 0.354" must be verified against PCB clearance constraints.

For Alternate Footprint Applications (PCB Redesign Acceptable):

UPJ1C101MED, UPM1C101MED, UPS1C101MED, and UPW1C101MED are suitable substitutes with 2000-hour lifetime ratings and identical 16 V voltage specification. These parts feature 0.098" (2.50mm) lead spacing and smaller diameter (0.248" / 6.30mm), requiring PCB layout modification. UPM1C101MED includes AEC-Q200 automotive qualification. UPV1C101MGD offers extended 5000-hour lifetime but carries obsolete status.

For Active Product Status Requirement:

UWT1C101MCL1GB (Nichicon, surface mount) and ECA-1CHG101 / ECA-1CHG101I (Panasonic, through-hole) are active products. UWT1C101MCL1GB requires surface mount assembly capability. ECA-1CHG101I includes AEC-Q200 automotive qualification with 0.098" lead spacing. ECA-1CHG101 features 0.079" lead spacing and smaller 0.197" diameter.

Voltage Derating Consideration:

UVZ1H101MPD provides 50 V rating with identical 0.138" lead spacing but carries "Not For New Designs" status and 1000-hour lifetime. This part is suitable only for legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can RL81V101MDN1 replace UST1C101MDD without PCB modification?

A: Yes. RL81V101MDN1 maintains identical lead spacing (0.138" / 4.60mm) and diameter (0.315" / 8.00mm). Height increases from 0.315" to 0.354", requiring verification of vertical clearance on the PCB. The 35 V rating provides voltage margin above the original 16 V specification.

Q: What is the difference between UPJ1C101MED, UPM1C101MED, and UPS1C101MED?

A: All three parts share identical electrical specifications (100 µF, 16 V, 2000-hour lifetime, ±20% tolerance). Differences exist in lead spacing, physical dimensions, and ratings. UPM1C101MED includes AEC-Q200 automotive qualification. UPJ1C101MED and UPS1C101MED are general-purpose parts. All require PCB layout modification due to 0.098" lead spacing versus the original 0.138".

Q: Is UWT1C101MCL1GB a direct replacement?

A: No. UWT1C101MCL1GB is a surface mount device (SMD) with radial, can package. It requires surface mount assembly equipment and PCB redesign. Lead spacing is not applicable for SMD packages. This part is suitable only for new designs with surface mount capability.

Q: Can Panasonic ECA-1CHG101 or ECA-1CHG101I replace the Nichicon UST1C101MDD?

A: Both Panasonic parts are electrically compatible (100 µF, 16 V, 1000-hour lifetime) and carry active product status. However, both feature different lead spacing (0.079" and 0.098" respectively) and smaller diameter (0.197" versus 0.315"), requiring PCB layout modification. ECA-1CHG101I includes AEC-Q200 automotive qualification.

Q: Why does UVZ1H101MPD have higher voltage (50 V) than the original part?

A: UVZ1H101MPD is rated for 50 V operation, providing voltage margin in applications where the original 16 V specification is adequate. However, this part carries "Not For New Designs" status and is recommended only for legacy system maintenance or repair applications.

Q: What does "Obsolete" product status mean for substitution?

A: Obsolete parts are no longer manufactured and inventory is limited. Substitution to active products (UWT1C101MCL1GB, ECA-1CHG101, ECA-1CHG101I) is recommended for new designs. For existing production, obsolete substitutes (UPJ1C101MED, UPM1C101MED, UPS1C101MED) may be available from inventory but with finite supply.

Q: Does lead spacing affect electrical performance?

A: Lead spacing does not affect electrical performance. It determines PCB footprint compatibility. Identical electrical specifications (capacitance, voltage, tolerance, lifetime) function identically regardless of lead spacing. PCB layout modification is required only when lead spacing differs from the original design.

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