DG187AP Equivalent & Substitute Parts

Part Overview

The DG187AP is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Vishay Siliconix, designed for 2:1 multiplexing applications with a maximum on-state resistance of 30Ohm. The device operates with dual supply voltages (±15V) and is housed in a 14-DIP through-hole package.

The DG187AP is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, and system upgrades where this part is no longer readily available or preferred for new implementations.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	1
On-State Resistance (Max)	30Ohm
Voltage - Supply, Dual (V±)	±15V
Switch Time - Ton (Max)	150ns
Switch Time - Toff (Max)	130ns
Channel Capacitance - CS(off)	9pF
Channel Capacitance - CD(off)	6pF
Current - Leakage (IS(off)) (Max)	1nA
Operating Temperature Range	-55°C ~ 125°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the DG187AP is determined by the following critical parameters:

Switch circuit topology (SPDT configuration)
Multiplexer circuit ratio (2:1)
Single circuit count
Package type and form factor (14-DIP through-hole)
Dual supply voltage compatibility range
On-state resistance specification
Operating temperature range

The DG305ACJ+ qualifies as a substitute based on matching switch topology (SPDT), circuit count (1), multiplexer ratio (2:1), and identical package form factor (14-DIP). Both devices support dual supply operation and through-hole mounting. However, electrical performance characteristics differ within acceptable substitution parameters for many applications.

Parameter Comparison

Parameter	DG187AP	DG305ACJ+
Switch Circuit	SPDT	SPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1
Number of Circuits	1	1
On-State Resistance (Max)	30Ohm	50Ohm
Voltage - Supply, Dual (V±)	±15V	±5V ~ 18V
Switch Time - Ton (Max)	150ns	250ns
Switch Time - Toff (Max)	130ns	150ns
Channel Capacitance - CS(off)	9pF	14pF
Channel Capacitance - CD(off)	6pF	14pF
Current - Leakage (IS(off)) (Max)	1nA	5nA
Charge Injection	Not specified	12pC
Crosstalk	Not specified	-74dB @ 500kHz
Operating Temperature Range	-55°C ~ 125°C	0°C ~ 70°C
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The DG305ACJ+ is an active product manufactured by Analog Devices Inc./Maxim Integrated and carries ROHS3 compliance certification, making it suitable for new designs and applications requiring RoHS-compliant components. The DG187AP, being obsolete and RoHS non-compliant, is not recommended for new implementations.

Selection between these devices depends on application-specific requirements. The DG187AP exhibits lower on-state resistance (30Ohm vs. 50Ohm) and faster switching times (150ns/130ns vs. 250ns/150ns). The DG305ACJ+ operates across a wider dual supply voltage range (±5V ~ 18V vs. fixed ±15V) and supports a narrower operating temperature range (0°C ~ 70°C vs. -55°C ~ 125°C).

Applications requiring extended temperature operation below 0°C or above 70°C cannot use the DG305ACJ+ as a direct substitute. Applications requiring the lowest on-state resistance or fastest switching performance may require circuit redesign if the DG305ACJ+ specifications are insufficient.

Frequently Asked Questions (FAQ)

Q: Can the DG305ACJ+ directly replace the DG187AP in existing designs?

A: Direct replacement is possible only if the application tolerates the electrical performance differences. The DG305ACJ+ has higher on-state resistance (50Ohm vs. 30Ohm), slower switching times (250ns/150ns vs. 150ns/130ns), and operates within a narrower temperature range (0°C ~ 70°C vs. -55°C ~ 125°C). Circuit validation is required for applications sensitive to these parameters.

Q: What is the primary reason to substitute the DG187AP?

A: The DG187AP is obsolete. The DG305ACJ+ is an active product with current manufacturing support, RoHS3 compliance, and documented availability. New designs should use the DG305ACJ+ or equivalent active alternatives.

Q: Are both devices available in the same package?

A: Yes. Both the DG187AP and DG305ACJ+ use 14-DIP (0.300", 7.62mm) through-hole packages with identical pin configurations, enabling direct socket compatibility.

Q: What are the key electrical differences between these devices?

A: The DG305ACJ+ has higher on-state resistance (50Ohm vs. 30Ohm), longer switch times (250ns/150ns vs. 150ns/130ns), higher leakage current (5nA vs. 1nA), and higher channel capacitance (14pF vs. 9pF/6pF). The DG305ACJ+ provides specified charge injection (12pC) and crosstalk performance (-74dB @ 500kHz), which are not specified for the DG187AP.

Q: Does the DG305ACJ+ support the same supply voltage as the DG187AP?

A: The DG187AP requires ±15V dual supply. The DG305ACJ+ operates across ±5V ~ 18V, which includes ±15V operation. However, the DG305ACJ+ has a narrower operating temperature range (0°C ~ 70°C), which may be a limiting factor in some applications.

Q: Is the DG305ACJ+ suitable for industrial or extended temperature applications?

A: The DG305ACJ+ operates from 0°C ~ 70°C. Applications requiring operation below 0°C or above 70°C cannot use this device. The DG187AP supports -55°C ~ 125°C operation, but as an obsolete product, alternative active components with extended temperature ratings should be evaluated for new designs.

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