Molex 0901200921 Equivalent & Substitute Parts

Part Overview

The Molex 0901200921 is a single-position rectangular connector header designed for through-hole mounting in board-to-board or cable applications. This connector features a vertical orientation with unshrouded design, gold-plated mating contacts, and tin-plated posts. The part operates across the automotive and general-purpose application spectrum with an operating temperature range of -55°C to 125°C.

The product maintains active status with 896 units in current inventory. Equivalent and substitute parts are identified based on matching mechanical and electrical parameters that preserve functional compatibility within the C-Grid III 90120 series ecosystem and compatible connector families.

Key Parameters

Parameter	Value
Manufacturer Part Number	0901200921
Manufacturer	Molex
Series	C-Grid III 90120
Connector Type	Header, Breakaway
Number of Positions	1
Mounting Type	Through Hole
Contact Type	Male Pin
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
Operating Temperature	-55°C to 125°C
Termination	Solder
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0901200921 is determined by the following critical parameters:

Single-position connector configuration
Through-hole solder termination
Male pin contact type
Vertical header orientation
Gold or tin contact finish options
Operating temperature compatibility (-55°C minimum to 125°C maximum)
ROHS3 compliance or equivalent regulatory status
Unshrouded or minimally shrouded design

Substitute parts are grouped into two categories based on manufacturer and series compatibility:

Category 1: Samtec Flex Stack ZW Series — Direct mechanical and electrical equivalents with identical single-position, through-hole configuration. These parts maintain the same contact material, termination method, and operating temperature range. Variations exist in stack height and post length to accommodate different PCB spacing requirements.

Category 2: TE Connectivity AMPMODU Mod II Series — Multi-position header with single-position extraction capability. This part is listed as obsolete but remains functionally compatible for applications requiring individual position selection.

Parameter Comparison

Parameter	Molex 0901200921	Samtec ZW-01-08-G-S-320-120	Samtec ZW-01-08-T-S-300-115	Samtec ZW-01-08-T-S-285-120	Samtec ZW-01-17-T-S-312-084	Samtec ZW-01-17-T-S-268-079	TE Connectivity 4-103239-0
Connector Type	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway	Header, Breakaway
Number of Positions	1	1	1	1	1	1	40
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Contact Finish - Mating	Gold	Gold	Tin	Tin	Tin	Tin	Gold
Contact Finish - Post	Tin	Gold	Tin	Tin	Tin	Tin	Tin-Lead
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-65°C to 105°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Applicable
Product Status	Active	Active	Active	Active	Active	Active	Obsolete
Inventory Status	896 Pcs	778 Pcs	694 Pcs	922 Pcs	910 Pcs	852 Pcs	3740 Pcs

Engineering Selection Recommendations

Primary Substitutes (Samtec Flex Stack ZW Series)

The Samtec ZW-01-08 and ZW-01-17 series connectors are the preferred substitutes for the Molex 0901200921. All variants maintain ROHS3 compliance, active product status, and identical operating temperature specifications. Selection within this group depends on stack height and post length requirements:

ZW-01-08-G-S-320-120: Gold mating contact finish with 0.320" stack height and 0.090" post length. Recommended for applications requiring gold contact compatibility with the original Molex part.
ZW-01-08-T-S-300-115: Tin mating contact finish with 0.300" stack height and 0.115" post length. Suitable for standard PCB spacing with tin-plated termination.
ZW-01-08-T-S-285-120: Tin mating contact finish with 0.285" stack height and 0.120" post length. Accommodates compact PCB layouts.
ZW-01-17-T-S-312-084: Tin mating contact finish with 0.312" stack height and 0.084" post length. Designed for applications with increased vertical clearance requirements.
ZW-01-17-T-S-268-079: Tin mating contact finish with 0.268" stack height and 0.079" post length. Optimized for space-constrained applications.

Secondary Substitute (TE Connectivity 4-103239-0)

The TE Connectivity AMPMODU Mod II 4-103239-0 is a 40-position header with individual position breakaway capability. This part is listed as obsolete and does not maintain ROHS3 compliance. The operating temperature range (-65°C to 105°C) is narrower than the Molex original, with a minimum temperature 10°C higher than the specified -55°C requirement. Use of this part is restricted to legacy applications where individual position extraction is functionally necessary and temperature constraints are satisfied.

Frequently Asked Questions (FAQ)

Q: Can Samtec ZW series connectors directly replace the Molex 0901200921 in existing designs?

A: Yes, within mechanical and electrical parameter constraints. All Samtec ZW-01-08 and ZW-01-17 variants share identical contact type, termination method, and operating temperature range. Substitution requires verification of stack height and post length compatibility with PCB hole spacing and mating connector geometry.

Q: What is the difference between gold and tin contact finishes in the substitute options?

A: The Molex original features gold mating contacts with tin posts. Samtec ZW-01-08-G-S-320-120 maintains this gold/tin combination. Other Samtec variants use tin for both mating and post surfaces. Contact finish selection affects corrosion resistance and mating force characteristics. Gold finishes provide superior corrosion resistance in harsh environments; tin finishes are suitable for standard industrial applications.

Q: Are all Samtec ZW series substitutes ROHS3 compliant?

A: Yes. All listed Samtec ZW-01-08 and ZW-01-17 variants maintain ROHS3 compliance and active product status. The TE Connectivity 4-103239-0 is not ROHS3 compliant and carries obsolete status.

Q: What determines stack height selection among the Samtec options?

A: Stack height defines the vertical distance between the PCB surface and the mating interface. Selection depends on available PCB clearance and the height of mating connectors or components. Samtec ZW-01-08 variants range from 0.275" to 0.320"; ZW-01-17 variants range from 0.268" to 0.312". Verify PCB layout constraints before selection.

Q: Can the TE Connectivity 4-103239-0 be used as a substitute?

A: The 4-103239-0 is functionally compatible for single-position applications through individual position breakaway. However, obsolete product status and lack of ROHS3 compliance restrict use to legacy systems where supply continuity is established. The operating temperature minimum of -65°C exceeds the Molex specification of -55°C, which may be incompatible with automotive applications requiring full -55°C to 125°C range.

Q: What is the inventory availability for substitute parts?

A: Samtec ZW series inventory ranges from 694 to 922 units across variants. TE Connectivity 4-103239-0 maintains 3740 units in stock. The Molex original has 896 units available. Inventory levels support immediate procurement for all listed options.

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