DG508ACWE Equivalent & Substitute Parts

Part Overview

The DG508ACWE is an 8:1 analog multiplexer/demultiplexer IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-SOIC package. This interface component features a single circuit with 450Ohm on-state resistance and operates across a dual supply voltage range of ±4.5V to ±18V. The DG508ACWE is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching multiplexer configuration, circuit count, and electrical performance within acceptable tolerances.

Key Parameters

Parameter	DG508ACWE
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	450Ohm
Channel-to-Channel Matching (ΔRon)	27Ohm
Voltage - Supply, Dual (V±)	±4.5V ~ 18V
Switch Time (Ton, Toff) (Max)	1.5µs, 1µs
Channel Capacitance (CS(off), CD(off))	5pF, 25pF
Current - Leakage (IS(off)) (Max)	1nA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.295", 7.50mm Width)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the DG508ACWE is determined by the following critical parameters:

Multiplexer Configuration: All substitutes must maintain 8:1 multiplexer/demultiplexer architecture with single circuit topology
On-State Resistance: Acceptable range is 270Ohm to 450Ohm maximum, with lower values providing improved performance
Channel-to-Channel Matching (ΔRon): Must not exceed 27Ohm to maintain signal integrity across channels
Supply Voltage Compatibility: Dual supply operation (V±) must support the application's voltage requirements
Switch Time Performance: Maximum switching times must meet application timing constraints
Package Compatibility: 16-SOIC surface mount package required; physical dimensions must accommodate PCB layout
Leakage Current: Maximum 1nA specification must be maintained
Operating Temperature Range: Substitutes operating at -40°C to 85°C provide extended temperature coverage compared to the original 0°C to 70°C range

Substitute parts are grouped into three categories based on on-state resistance performance: 300Ohm class (ADG508AKRZ variants), 270Ohm class (ADG508FBRNZ/FBRWZ variants), and 400Ohm class (HI9P0508 variants). All maintain 8:1 multiplexer functionality and single-circuit configuration.

Parameter Comparison

Parameter	DG508ACWE	DG508ACWE+	ADG508AKRZ	ADG508AKRZ-REEL	ADG508AKRZ-REEL7	ADG508FBRNZ	ADG508FBRNZ-REEL7	ADG508FBRWZ	ADG508FBRWZ-REEL	HI9P0508-5Z	HI9P0508-5Z96
Multiplexer/Demultiplexer Circuit	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1	8:1
Number of Circuits	1	1	1	1	1	1	1	1	1	1	1
On-State Resistance (Max)	450Ohm	450Ohm	300Ohm	300Ohm	300Ohm	270Ohm (Typ)	270Ohm (Typ)	270Ohm (Typ)	270Ohm (Typ)	400Ohm	400Ohm
Channel-to-Channel Matching (ΔRon)	27Ohm	27Ohm	15Ohm	15Ohm	15Ohm	8.1Ohm	8.1Ohm	8.1Ohm	8.1Ohm	20Ohm	20Ohm
Voltage - Supply, Dual (V±)	±4.5V ~ 18V	±4.5V ~ 18V	±10.8V ~ 16.5V	±10.8V ~ 16.5V	±10.8V ~ 16.5V	±15V	±15V	±15V	±15V	±15V	±15V
Switch Time (Ton, Toff) (Max)	1.5µs, 1µs	1.5µs, 1µs	300ns, 300ns	300ns, 300ns	300ns, 300ns	230ns, 130ns	230ns, 130ns	230ns, 130ns	230ns, 130ns	250ns, 250ns (Typ)	250ns, 250ns (Typ)
Channel Capacitance (CS(off), CD(off))	5pF, 25pF	5pF, 25pF	5pF, 22pF	5pF, 22pF	5pF, 22pF	3pF, 22pF	3pF, 22pF	3pF, 22pF	3pF, 22pF	10pF, 17pF	10pF, 17pF
Current - Leakage (IS(off)) (Max)	1nA	1nA	1nA	1nA	1nA	1nA	1nA	1nA	1nA	30pA (Typ)	30pA (Typ)
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 75°C	0°C ~ 75°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Packaging Variant)

DG508ACWE+ serves as the direct functional equivalent with identical electrical specifications. This part maintains the same 450Ohm on-state resistance, 27Ohm channel matching, and ±4.5V to ±18V supply range. The primary distinction is product status: DG508ACWE+ is active and ROHS3 compliant, whereas the original DG508ACWE is obsolete and RoHS non-compliant. Selection of DG508ACWE+ is appropriate for applications requiring exact electrical performance match with modern compliance requirements.

Performance-Enhanced Substitutes (Analog Devices ADG508 Series)

The ADG508AKRZ, ADG508AKRZ-REEL, and ADG508AKRZ-REEL7 variants reduce on-state resistance to 300Ohm with improved channel matching of 15Ohm. These parts operate across ±10.8V to ±16.5V supply range and deliver faster switching performance (300ns versus 1.5µs). Extended operating temperature range (-40°C to 85°C) provides broader environmental coverage. These substitutes are suitable for applications where lower on-state resistance and faster switching improve signal fidelity and system performance.

The ADG508FBRNZ, ADG508FBRNZ-REEL7, ADG508FBRWZ, and ADG508FBRWZ-REEL variants offer the lowest on-state resistance at 270Ohm (typical) with superior channel matching of 8.1Ohm. Switch times improve to 230ns and 130ns. Operation is fixed at ±15V supply. These parts are optimal for precision analog switching applications requiring minimal resistance variation across channels.

Alternative Manufacturer Substitute (Renesas HI9P0508 Series)

The HI9P0508-5Z and HI9P0508-5Z96 from Renesas Electronics Corporation maintain 8:1 multiplexer configuration with 400Ohm on-state resistance and 20Ohm channel matching. Supply voltage is fixed at ±15V. Operating temperature range is 0°C to 75°C. These parts provide functional compatibility with slightly higher on-state resistance but remain within acceptable substitution parameters. Selection is appropriate when Renesas component qualification or supply chain requirements apply.

All substitute options are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can ADG508AKRZ directly replace DG508ACWE in existing designs?

A: Electrical substitution is feasible provided the application's supply voltage range accommodates ±10.8V to ±16.5V operation. The ADG508AKRZ delivers superior performance with 300Ohm on-state resistance and 300ns switching time. However, designs operating below ±10.8V supply voltage require DG508ACWE+ or HI9P0508 variants. PCB layout verification is necessary due to potential package dimension differences.

Q: What is the significance of on-state resistance differences between substitutes?

A: On-state resistance directly affects signal attenuation and power dissipation in analog switching applications. Lower resistance (270Ohm ADG508FBRNZ versus 450Ohm DG508ACWE) reduces signal loss and heat generation. Channel-to-channel matching (ΔRon) ensures consistent performance across all eight multiplexer channels. Applications with stringent signal integrity requirements benefit from lower resistance and tighter matching specifications.

Q: Are packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) electrically equivalent?

A: Yes. Packaging variants of the same part number (e.g., ADG508AKRZ, ADG508AKRZ-REEL, ADG508AKRZ-REEL7) are electrically identical. Packaging differences affect handling, storage, and assembly processes only. Selection depends on manufacturing equipment compatibility and supply chain requirements, not electrical performance.

Q: Why do some substitutes specify fixed supply voltages (±15V) instead of ranges?

A: Parts such as ADG508FBRNZ and HI9P0508-5Z are characterized and rated for fixed supply voltages. These devices operate correctly across a range near the specified voltage but are tested and guaranteed at the stated value. Applications requiring operation across broader voltage ranges (±4.5V to ±18V) must select parts with explicit voltage range specifications such as DG508ACWE+ or ADG508AKRZ.

Q: How does extended operating temperature range (-40°C to 85°C) affect substitution decisions?

A: Extended temperature range provides design margin for industrial and automotive applications. ADG508 variants from Analog Devices operate from -40°C to 85°C, compared to DG508ACWE at 0°C to 70°C. Selection of extended-range parts eliminates temperature-related performance degradation in harsh environments. Applications limited to 0°C to 70°C operation may select any substitute without temperature-related constraints.

Q: What is the impact of charge injection differences between parts?

A: Charge injection affects signal accuracy in precision analog applications. DG508ACWE does not specify charge injection. ADG508AKRZ specifies 4pC, while ADG508FBRNZ specifies 15pC. Lower charge injection (4pC) provides superior performance in high-frequency or precision measurement circuits. Applications with relaxed accuracy requirements tolerate higher charge injection values.

Q: Can HI9P0508-5Z substitute for DG508ACWE in all applications?

A: HI9P0508-5Z maintains 8:1 multiplexer functionality and 1nA maximum leakage current, supporting most applications. However, fixed ±15V supply operation and 0°C to 75°C temperature range may not suit all designs. On-state resistance is 400Ohm, slightly lower than DG508ACWE's 450Ohm. Verify supply voltage compatibility and temperature requirements before selection.

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