GDH04S Equivalent & Substitute Parts

Part Overview

The GDH04S is a 4-position surface mount DIP switch manufactured by TE Connectivity ALCOSWITCH Switches. This component is classified as obsolete, indicating it is no longer in active production. The switch features SPST (Single Pole Single Throw) circuit configuration with a 25mA current rating at 24VDC, employing a slide actuator with flush, recessed positioning. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	GDH04S Value
Circuit Configuration	SPST
Number of Positions	4
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Mounting Type	Surface Mount
Termination Style	Gull Wing
Pitch	0.050" (1.27mm), Half
Contact Material	Copper Alloy
Contact Finish	Gold
Height Above Board	0.091" (2.30mm)
Operating Temperature Range	-30°C ~ 85°C
Mechanical Life	1,000 Cycles
Electrical Life	1,000 Cycles

Substitute Part Grouping Explanation

Substitution of the GDH04S is determined by strict equivalence across the following critical parameters: circuit configuration (SPST), number of positions (4), current rating (25mA), voltage rating (24VDC), actuator type (slide standard), mounting type (surface mount), termination style (gull wing), and pitch (0.050" half). All substitute parts listed maintain these core electrical and mechanical specifications.

The substitute parts are categorized as follows:

Direct Equivalent (1571983-4): Identical electrical and mechanical specifications to GDH04S with active product status and RoHS3 compliance.

Direct Equivalent (218-4LPST): Maintains all critical electrical parameters with minor mechanical variations in height above board (0.104" vs. 0.091") and extended operating temperature range (-55°C ~ 85°C). Contact material differs (Beryllium Copper vs. Copper Alloy) but maintains gold finish and equivalent electrical performance.

Similar Equivalent (97R04ST, 97R04T): Maintains all critical electrical parameters with reduced height above board (0.061" vs. 0.091"), extended operating temperature range (-40°C ~ 85°C), and different body material (Polyamide/Nylon vs. Polyphenylene Sulfide). The 97R04T variant does not include washable feature present in GDH04S.

Parameter Comparison

Parameter	GDH04S	1571983-4	218-4LPST	97R04ST	97R04T
Manufacturer	TE Connectivity ALCOSWITCH	TE Connectivity ALCOSWITCH	CTS Electrocomponents	Grayhill Inc.	Grayhill Inc.
Product Status	Obsolete	Active	Active	Active	Active
Circuit	SPST	SPST	SPST	SPST	SPST
Number of Positions	4	4	4	4	4
Current Rating	25mA	25mA	25mA	25mA	25mA
Voltage Rating	24VDC	24VDC	24VDC	24VDC	24VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)	Slide (Standard)	Slide (Standard)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Termination Style	Gull Wing	Gull Wing	Gull Wing	Gull Wing	Gull Wing
Pitch	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Contact Material	Copper Alloy	Copper Alloy	Beryllium Copper	Copper Alloy	Copper Alloy
Contact Finish	Gold	Gold	Gold	Gold	Gold
Height Above Board	0.091" (2.30mm)	0.091" (2.30mm)	0.104" (2.65mm)	0.061" (1.55mm)	0.061" (1.55mm)
Operating Temperature	-30°C ~ 85°C	-30°C ~ 85°C	-55°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mechanical Life	1,000 Cycles	1,000 Cycles	Not Specified	1,000 Cycles	1,000 Cycles
Electrical Life	1,000 Cycles	1,000 Cycles	1,000 Cycles	Not Specified	Not Specified
RoHS Status	RoHS Non-Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Washable	Yes	Yes	Yes	Yes	No

Engineering Selection Recommendations

1571983-4 (TE Connectivity ALCOSWITCH): This part represents the direct equivalent replacement for GDH04S. It maintains identical electrical specifications, mechanical dimensions, and operating temperature range. The primary advantage is active product status with RoHS3 compliance, addressing regulatory requirements that the obsolete GDH04S does not meet. This part is the preferred selection for direct substitution in new designs and production continuity.

218-4LPST (CTS Electrocomponents): This part provides functional equivalence with extended operating temperature range (-55°C ~ 85°C) compared to GDH04S (-30°C ~ 85°C). The height above board is marginally increased (0.104" vs. 0.091"), which may require PCB layout verification. Contact material differs (Beryllium Copper vs. Copper Alloy), and additional features include epoxy sealed terminals. RoHS3 compliance is achieved. This selection is appropriate for applications requiring extended low-temperature operation.

97R04ST (Grayhill Inc.): This part maintains all critical electrical parameters with reduced profile height (0.061" vs. 0.091"), enabling use in space-constrained applications. Operating temperature range extends to -40°C. Body material differs (Polyamide/Nylon vs. Polyphenylene Sulfide). RoHS3 compliance is achieved. This selection is suitable for compact designs where reduced height is beneficial.

97R04T (Grayhill Inc.): This part is electrically and mechanically equivalent to 97R04ST with the exception that the washable feature is not included. This variant is appropriate only for applications where washability is not a requirement. RoHS3 compliance is achieved.

Frequently Asked Questions (FAQ)

Q: Can GDH04S be directly replaced with 1571983-4?

A: Yes. The 1571983-4 maintains identical electrical specifications (SPST, 4-position, 25mA, 24VDC), mechanical dimensions (0.091" height, 0.050" pitch), and operating temperature range (-30°C ~ 85°C). The primary difference is active product status and RoHS3 compliance. Direct substitution is supported.

Q: What are the mechanical differences between GDH04S and the Grayhill 97R04ST/97R04T parts?

A: The Grayhill parts feature reduced height above board (0.061" vs. 0.091"), resulting in a lower profile component. Body material differs (Polyamide/Nylon vs. Polyphenylene Sulfide). All other mechanical parameters including pitch, termination style, and gull wing leads remain equivalent. PCB layout compatibility should be verified for the reduced height.

Q: Does the CTS 218-4LPST have different contact material than GDH04S?

A: Yes. The 218-4LPST uses Beryllium Copper contacts versus Copper Alloy in GDH04S. Both maintain gold finish. The Beryllium Copper contact material in 218-4LPST provides extended operating temperature range (-55°C ~ 85°C) and includes epoxy sealed terminals as an additional feature.

Q: Which substitute part is recommended for RoHS compliance?

A: All substitute parts (1571983-4, 218-4LPST, 97R04ST, 97R04T) are RoHS3 compliant. The obsolete GDH04S is RoHS non-compliant. Selection of any active substitute part addresses RoHS regulatory requirements.

Q: Is the 97R04T washable?

A: No. The 97R04T does not include the washable feature present in GDH04S and other substitute parts. The 97R04ST variant does include washability. Selection between these Grayhill parts depends on whether washable assembly processes are required.

Q: What is the inventory status of these substitute parts?

A: Current inventory levels are: 1571983-4 (1,303 pcs), 218-4LPST (6,561 pcs), 97R04ST (3,626 pcs), and 97R04T (906 pcs). The GDH04S has 2,400 pcs in stock but is obsolete.

Q: Are all substitute parts available in tube packaging?

A: Yes. All substitute parts (1571983-4, 218-4LPST, 97R04ST, 97R04T) are available in tube packaging, consistent with standard DIP switch distribution formats.

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