PI5A4594ACEX Equivalent & Substitute Parts

Part Overview

The PI5A4594ACEX is a single-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch manufactured by Diodes Incorporated, housed in a 5-TSSOP (SC-70-5) package. This component features a 10Ohm on-state resistance and operates across a 2V to 5.5V supply voltage range, making it suitable for low-voltage signal switching applications in consumer and industrial electronics.

The PI5A4594ACEX is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this component.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI5A4594ACEX
Manufacturer	Diodes Incorporated
Switch Circuit Type	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	1
On-State Resistance (Max)	10Ohm
Voltage - Supply, Single (V+)	2V ~ 5.5V
Switch Time (Ton, Toff) (Max)	38ns, 42ns
-3dB Bandwidth	30MHz
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	500pA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	5-TSSOP, SC-70-5, SOT-353
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI5A4594ACEX is determined by the following critical parameters:

Switch Circuit Type: Must be SPST - NO (Single Pole Single Throw - Normally Open)
Multiplexer/Demultiplexer Circuit: Must be 1:1 configuration
Number of Circuits: Must be 1 circuit
On-State Resistance: Acceptable range is 8Ohm to 10Ohm (low-resistance variants preferred for minimal signal attenuation)
Voltage - Supply, Single (V+): Must support minimum 2V operation; 2V ~ 5.5V or compatible range
Package / Case: SC-70-5 (5-TSSOP) or equivalent footprint-compatible packages (SOT-23-5)
Operating Temperature: Must support -40°C ~ 85°C minimum
RoHS Compliance: ROHS3 Compliant required
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories:

Category A - Direct Replacements (Identical On-State Resistance, SC-70-5 Package)

MAX4594DCKR, MAX4594EXK+T, TS5A4594DCKR

Category B - Functional Equivalents (Lower On-State Resistance, Enhanced Performance)

TS5A4594DBVR (SOT-23-5 package variant)

Category C - Alternative Topology (Higher On-State Resistance, Extended Supply Range)

ISL43L110IHZ-T (220mOhm typical, lower voltage operation)

Category D - Logic-Level Switch (Higher On-State Resistance, Extended Temperature)

74HCT1G66GW-Q100H (95Ohm, automotive-grade)

Parameter Comparison

Parameter	PI5A4594ACEX	MAX4594DCKR	MAX4594EXK+T	TS5A4594DCKR	TS5A4594DBVR	ISL43L110IHZ-T	74HCT1G66GW-Q100H
Manufacturer	Diodes Inc.	Texas Instruments	Analog Devices/Maxim	Texas Instruments	Texas Instruments	Renesas Electronics	Nexperia USA Inc.
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
On-State Resistance (Max)	10Ohm	10Ohm	10Ohm	8Ohm	8Ohm	220mOhm (Typ)	95Ohm
Voltage - Supply (V+)	2V ~ 5.5V	2.4V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	1.1V ~ 4.5V	4.5V ~ 5.5V
Switch Time Ton (Max)	38ns	35ns	35ns	17ns	17ns	15ns	30ns
Switch Time Toff (Max)	42ns	40ns	40ns	14ns	14ns	10ns	44ns
-3dB Bandwidth	30MHz	300MHz	300MHz	450MHz	450MHz	—	200MHz
Charge Injection	2pC	2pC	2pC	2pC	2pC	89pC	—
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	8pF, 8pF	8pF, 8pF	6.5pF, 6.5pF	6.5pF, 6.5pF	68pF	—
Current - Leakage (IS(off)) (Max)	500pA	500pA	500pA	500pA	500pA	30nA	1µA
Operating Temperature	-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 ~ 125°C
Package / Case	SC-70-5	SC-70-5	SC-70-5	SC-70-5	SOT-23-5	SC-70-5	5-TSSOP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

MAX4594DCKR and MAX4594EXK+T are the preferred direct replacements for the PI5A4594ACEX. Both maintain identical on-state resistance (10Ohm), support the full 2V to 5.5V supply range, and are housed in the SC-70-5 package. Both parts are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and consistent manufacturing quality.

Secondary Substitute (Enhanced Performance)

TS5A4594DCKR offers improved switching performance with reduced on-state resistance (8Ohm), faster switching times (17ns/14ns versus 38ns/42ns), and higher bandwidth (450MHz versus 30MHz). The SC-70-5 package maintains footprint compatibility. This part is suitable for applications requiring faster signal switching or lower insertion loss.

Alternative Package Option

TS5A4594DBVR provides the same electrical performance as TS5A4594DCKR but in a SOT-23-5 package. This variant is appropriate for designs where PCB layout permits the larger footprint or where SOT-23-5 assembly infrastructure is preferred.

Extended Supply Range Option

ISL43L110IHZ-T supports a lower minimum supply voltage (1.1V) and features significantly lower on-state resistance (220mOhm typical). This part is suitable for ultra-low-voltage applications but introduces higher charge injection (89pC) and channel capacitance (68pF), which may affect signal integrity in high-frequency circuits. MSL 2 rating requires 1-year shelf-life management.

Logic-Level Alternative

74HCT1G66GW-Q100H is a logic-level SPST switch with automotive-grade qualification (AEC-Q100) and extended operating temperature range (-40°C to 125°C). The 95Ohm on-state resistance and 4.5V minimum supply voltage limit its use to 5V logic applications. This part is suitable for automotive or industrial environments requiring higher temperature operation.

Frequently Asked Questions (FAQ)

Q: Can I use TS5A4594DCKR as a direct replacement for PI5A4594ACEX?

A: Yes. TS5A4594DCKR is functionally compatible and maintains the SC-70-5 package footprint. The 8Ohm on-state resistance is lower than the original 10Ohm specification, which reduces signal insertion loss and improves switching performance. No circuit modifications are required.

Q: What is the difference between MAX4594DCKR and MAX4594EXK+T?

A: Both parts are electrically identical with 10Ohm on-state resistance and identical electrical specifications. The primary difference is packaging format: MAX4594DCKR is supplied in Cut Tape (CT) & Digi-Reel format, while MAX4594EXK+T is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements.

Q: Can I use ISL43L110IHZ-T in a 5V application?

A: ISL43L110IHZ-T operates within the 1.1V to 4.5V supply range and is not rated for 5.5V operation. Using this part in a 5V application exceeds the maximum supply voltage specification and will result in device damage or failure. This part is suitable only for applications operating at 4.5V or below.

Q: Is 74HCT1G66GW-Q100H suitable for my 2V to 5.5V application?

A: No. The 74HCT1G66GW-Q100H requires a minimum supply voltage of 4.5V and is not rated for operation below this threshold. This part is suitable only for 5V logic applications. For 2V to 5.5V operation, use MAX4594DCKR, MAX4594EXK+T, or TS5A4594DCKR.

Q: What is the impact of higher on-state resistance on signal quality?

A: Higher on-state resistance increases insertion loss and signal attenuation. For analog signal switching, lower on-state resistance (8Ohm to 10Ohm) is preferred. The 74HCT1G66GW-Q100H (95Ohm) and ISL43L110IHZ-T (220mOhm) introduce significant insertion loss and are suitable only for applications where signal attenuation is acceptable or where the switched signal is buffered.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original PI5A4594ACEX specification.

Q: What does MSL 2 (1 Year) mean for ISL43L110IHZ-T?

A: MSL 2 indicates Moisture Sensitivity Level 2, requiring a 1-year shelf-life limit from the date of manufacture. Components must be stored in controlled humidity environments and baked before reflow soldering if shelf-life is exceeded. MSL 1 parts (all other substitutes) have unlimited shelf life and do not require special storage management.

Q: Can I use TS5A4594DBVR if my PCB layout accommodates SOT-23-5 packages?

A: Yes. TS5A4594DBVR is electrically identical to TS5A4594DCKR and offers the same performance benefits (8Ohm resistance, 450MHz bandwidth, faster switching). The SOT-23-5 package is larger than SC-70-5 but provides improved thermal characteristics and easier hand-soldering if required. Footprint compatibility with your PCB layout is the only constraint.

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