PCN21B-55SC-2PF-G Equivalent & Substitute Parts

Part Overview

The PCN21B-55SC-2PF-G 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, right-angle mounting, and gold-plated contacts rated for 1.5A at 300V across an operating temperature range of -55°C to 125°C.

The PCN21B-55SC-2PF-G is classified as obsolete. Equivalent substitute connectors 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
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
Connector Style	C 11
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute connectors for the PCN21B-55SC-2PF-G are qualified based on the following electrical and mechanical parameters:

Core Compatibility Parameters:

55 positions, 5 rows, 2.00mm pitch
Receptacle, female sockets configuration
Press-fit termination
Through-hole, right-angle mounting
Gold contact finish
1.5A current rating
Operating temperature range -55°C to 125°C
Connector style C 11 (primary group) or CR 11 (secondary group with shield variations)

Voltage Rating Consideration: The PCN21B-55SC-2PF-G operates at 300V. All qualified substitutes operate at 750Vrms, which exceeds the original specification and provides enhanced electrical performance margin.

Substitute Parts Identified:

Primary Group (C 11 Style, No Shield):

HM2R03PA5100N9LF
HM2R30PA5100N9LF
HM2R30PA5100AALF

Secondary Group (C 11 Style, Upper Shield):

HM2R03PA5108N9LF
HM2R30PA5108N9LF

Tertiary Group (CR 11 Style, No Shield):

HM2R20PA5100N9LF

Quaternary Group (CR 11 Style, Upper and Lower Shield):

HM2R21PA5101N9LF

Parameter Comparison

Parameter	PCN21B-55SC-2PF-G	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)
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
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
Connector Style	C 11	C 11	C 11	CR 11	CR 11	C 11	C 11	C 11
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
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (No Shield Required): Select from the primary group: HM2R03PA5100N9LF, HM2R30PA5100N9LF, or HM2R30PA5100AALF. These connectors maintain C 11 connector style compatibility with the original PCN21B-55SC-2PF-G and are active products with RoHS compliance.

For Enhanced EMI Performance (Upper Shield): Select HM2R03PA5108N9LF or HM2R30PA5108N9LF when electromagnetic interference mitigation is required. These variants include upper shield features while maintaining electrical and mechanical compatibility.

For Shielded Applications (Full Shield): Select HM2R21PA5101N9LF when both upper and lower shielding are required. This connector operates under CR 11 connector style and provides complete EMI containment.

For Alternative Connector Style (CR 11, No Shield): Select HM2R20PA5100N9LF when CR 11 connector style is acceptable and no shielding is needed.

All substitute parts are manufactured by Amphenol ICC (FCI), operate at 750Vrms (exceeding the original 300V specification), maintain identical pitch, position count, and termination method, and are RoHS compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can HM2R03PA5100N9LF directly replace PCN21B-55SC-2PF-G? A: Yes. Both connectors share identical electrical specifications (1.5A, -55°C to 125°C operating range), mechanical configuration (55 positions, 2.00mm pitch, 5 rows, press-fit termination), and contact finish (gold). The HM2R03PA5100N9LF operates at 750Vrms, which exceeds the original 300V rating. The primary difference is mounting designation (board edge vs. standard through-hole), which does not affect functional compatibility in press-fit applications.

Q: What is the difference between C 11 and CR 11 connector styles? A: Connector style designates the physical form factor and shielding configuration. C 11 represents unshielded or partially shielded variants, while CR 11 represents fully shielded variants with upper and lower shield plates. Selection depends on electromagnetic compatibility requirements of the application.

Q: Are all substitute parts RoHS compliant? A: Yes. All Amphenol ICC (FCI) Millipacs® substitute parts listed are RoHS compliant. The original PCN21B-55SC-2PF-G RoHS status is not specified in the provided data.

Q: What is the difference between HM2R30PA5100N9LF and HM2R30PA5100AALF? A: Both connectors are electrically and mechanically identical with C 11 connector style, 55 positions, 2.00mm pitch, and press-fit termination. The difference lies in packaging designation (N9LF vs. AALF suffix), which may indicate different tape-and-reel or tray configurations. Consult the manufacturer for specific packaging requirements.

Q: Can I use HM2R03PA5108N9LF (with upper shield) in place of HM2R03PA5100N9LF (no shield)? A: Yes. The HM2R03PA5108N9LF is electrically and mechanically compatible with HM2R03PA5100N9LF. The addition of upper shielding provides enhanced EMI performance without affecting core electrical specifications or pin compatibility. Physical board layout must accommodate the shield structure.

Q: What inventory levels are available for these substitute parts? A: Current inventory levels are: HM2R03PA5100N9LF (1418 pcs), HM2R03PA5108N9LF (9516 pcs), HM2R20PA5100N9LF (757 pcs), HM2R21PA5101N9LF (726 pcs), HM2R30PA5100AALF (2117 pcs), HM2R30PA5100N9LF (1109 pcs), HM2R30PA5108N9LF (1315 pcs).

Q: Are there secondary substitutes listed for the HM2R20PA5100N9LF and HM2R30PA5108N9LF? A: Yes. HM2R20PA5100N9LF and HM2R30PA5108N9LF each reference secondary substitutes: 17230552102 and 17230554102. These part numbers are provided in the manufacturer data but are not detailed in the primary substitute list.

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