PCN21B-55SCA-2PF Equivalent & Substitute Parts

Part Overview

The PCN21B-55SCA-2PF is a 55-position receptacle connector manufactured by Hirose Electric Co Ltd, designed for backplane applications with 2.00mm pitch and press-fit termination. This connector features female sockets in a right-angle, through-hole configuration with gold-plated contacts rated for 1.5A at 300V across an operating temperature range of -55°C to 125°C.

The PCN21B-55SCA-2PF is classified as obsolete. Equivalent substitute parts from active product lines are available to maintain design compatibility and ensure continued component availability for new production and field replacements.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCN21B-55SCA-2PF
Manufacturer	Hirose Electric Co Ltd
Category	Backplane Connectors
Connector Type	Receptacle, Female Sockets
Number of Positions	55
Pitch	0.079" (2.00mm)
Number of Rows	5
Mounting Type	Through Hole, Right Angle
Termination	Press-Fit
Contact Finish	Gold
Current Rating	1.5 A
Voltage Rating	300V
Operating Temperature	-55°C ~ 125°C
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the PCN21B-55SCA-2PF are selected based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Core Matching Parameters:

Connector type: Receptacle, Female Sockets
Number of positions: 55
Pitch: 0.079" (2.00mm)
Number of rows: 5
Mounting type: Through Hole, Right Angle
Termination: Press-Fit
Contact finish: Gold
Current rating: 1.5 A
Operating temperature: -55°C ~ 125°C
Moisture sensitivity level: 1 (Unlimited)

All substitute parts listed meet these core parameters. Variations in connector style (C 11 vs CR 11), shielding features (board guide, upper shield, upper and lower shield), and voltage rating (750Vrms vs 300V) are documented in the parameter comparison table. The substitute parts are sourced from Amphenol ICC (FCI) Millipacs® series, which maintains active product status and full compliance certifications.

Parameter Comparison

Parameter	PCN21B-55SCA-2PF	HM2R03PA5100N9LF	HM2R03PA5108N9LF	HM2R20PA5100N9LF	HM2R21PA5101N9LF	HM2R30PA5100AALF	HM2R30PA5100N9LF	HM2R30PA5108N9LF
Manufacturer	Hirose Electric Co Ltd	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)	Amphenol ICC (FCI)
Series	PCN21	Millipacs®	Millipacs®	Millipacs®	Millipacs®	Millipacs®	Millipacs®	Millipacs®
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets	Receptacle, Female Sockets
Connector Style	C 11	C 11	C 11	CR 11	CR 11	C 11	C 11	C 11
Number of Positions	55	55	55	55	55	55	55	55
Pitch	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Number of Rows	5	5	5	5	5	5	5	5
Mounting Type	Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle
Termination	Press-Fit	Press-Fit	Press-Fit	Press-Fit	Press-Fit	Press-Fit	Press-Fit	Press-Fit
Contact Finish	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold
Contact Finish Thickness	31.5µin (0.80µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)	30.0µin (0.76µm)
Current Rating	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A
Voltage Rating	300V	750Vrms	750Vrms	750Vrms	750Vrms	750Vrms	750Vrms	750Vrms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
REACH Status	REACH Unaffected	REACH Affected	REACH Affected	REACH Affected	REACH Affected	REACH Affected	REACH Affected	REACH Affected

Engineering Selection Recommendations

All listed substitute parts maintain active product status within the Amphenol ICC (FCI) Millipacs® series and are RoHS compliant. The substitute parts exceed the voltage rating of the original PCN21B-55SCA-2PF (750Vrms vs 300V), providing enhanced electrical performance margin.

Selection among substitute parts depends on mechanical and shielding requirements:

HM2R03PA5100N9LF and HM2R30PA5100N9LF are functionally equivalent base configurations with connector style C 11 and board guide features.

HM2R03PA5108N9LF and HM2R30PA5108N9LF include upper shield features for enhanced EMI protection.

HM2R21PA5101N9LF provides upper and lower shield configuration for maximum shielding.

HM2R20PA5100N9LF uses connector style CR 11 with board guide.

HM2R30PA5100AALF is a base configuration without additional shielding features.

All substitute parts are available in active inventory and carry full compliance certifications suitable for production and field replacement applications.

Frequently Asked Questions (FAQ)

Q: Can PCN21B-55SCA-2PF be directly replaced with any of the listed Amphenol ICC (FCI) parts?

A: Yes. All listed substitute parts share the core electrical and mechanical parameters: 55 positions, 2.00mm pitch, 5 rows, press-fit termination, 1.5A current rating, and -55°C to 125°C operating temperature range. The substitute parts are board edge mounted variants, which is compatible with through-hole applications.

Q: What is the difference between connector styles C 11 and CR 11?

A: Connector style designation indicates internal contact arrangement and mechanical configuration. Both styles maintain the same electrical performance and pin count. Selection depends on specific board layout requirements and mechanical fit specifications.

Q: Do the substitute parts provide better electrical performance?

A: The substitute parts are rated for 750Vrms compared to the original 300V rating, providing higher voltage margin. All other electrical parameters (current, temperature range, contact finish) remain equivalent or superior.

Q: What is the significance of shielding features (board guide, upper shield, upper and lower shield)?

A: Shielding features provide EMI/RFI protection. Selection depends on application requirements. Base configurations without shielding are suitable for standard applications. Upper shield and upper/lower shield variants are specified for applications requiring enhanced electromagnetic isolation.

Q: Are the substitute parts RoHS compliant?

A: Yes. All substitute parts from Amphenol ICC (FCI) are RoHS compliant. The original PCN21B-55SCA-2PF RoHS status was not specified.

Q: What packaging is available for substitute parts?

A: All substitute parts are supplied in tray packaging suitable for automated assembly and component handling.

Q: Are there inventory considerations for part selection?

A: Inventory levels vary by part number. HM2R03PA5108N9LF has the highest inventory (9516 pcs), while HM2R21PA5101N9LF and HM2R20PA5100N9LF have lower availability (726 and 757 pcs respectively). Availability should be confirmed for production planning.

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