PI5A4599ACEX Equivalent & Substitute Parts

Part Overview

The PI5A4599ACEX is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by Diodes Incorporated, designed for 2:1 multiplexing applications in surface-mount SC-70-6 packaging. This part operates across a 2V to 6V single supply range with an 8Ohm on-state resistance and 30MHz bandwidth, making it suitable for low-frequency signal routing and audio applications.

The PI5A4599ACEX is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring compatible performance characteristics.

Key Parameters

Parameter	PI5A4599ACEX
Switch Circuit	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	1
On-State Resistance (Max)	8Ohm
Channel-to-Channel Matching (ΔRon)	100mOhm
Voltage - Supply, Single (V+)	2V ~ 6V
Switch Time (Ton, Toff) (Max)	15ns, 10ns
-3dB Bandwidth	30MHz
Charge Injection	1.5pC
Channel Capacitance (CS(off), CD(off))	5pF, 5pF
Current - Leakage (IS(off)) (Max)	1nA
Crosstalk	-80dB @ 1MHz
Operating Temperature	-40°C ~ 85°C
Package / Case	6-TSSOP, SC-88, SOT-363
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the PI5A4599ACEX is determined by the following critical parameters:

Switch topology: SPDT configuration with 2:1 multiplexing capability
Packaging: Surface-mount SC-70-6 (SOT-363-6) form factor
Supply voltage range: Minimum 2V operation required; maximum 6V tolerance
On-state resistance: Maximum 8Ohm specification for signal integrity
Operating temperature: -40°C to 85°C range
Compliance: ROHS3 compliance and MSL Level 1 rating

Substitute parts must maintain compatibility across these parameters. Parts with higher on-state resistance, narrower supply voltage ranges, or incompatible packaging are not direct substitutes but may serve as functional alternatives depending on application requirements.

Parameter Comparison

Parameter	PI5A4599ACEX	PI5A4599BCEX	ADG779BKSZ-REEL7	MAX4599EXT+T
Manufacturer	Diodes Incorporated	Diodes Incorporated	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Last Time Buy	Active	Active
Switch Circuit	SPDT	SPDT	SPDT	SPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1	2:1	2:1
Number of Circuits	1	1	1	1
On-State Resistance (Max)	8Ohm	11Ohm	5Ohm	60Ohm
Channel-to-Channel Matching (ΔRon)	100mOhm	150mOhm	100mOhm	200mOhm
Voltage - Supply, Single (V+)	2V ~ 6V	1.6V ~ 6V	1.8V ~ 5.5V	2V ~ 5.5V
Switch Time (Ton, Toff) (Max)	15ns, 10ns	15ns, 7ns	14ns, 3ns (Typ)	30ns, 25ns
-3dB Bandwidth	30MHz	350MHz	200MHz	200MHz
Charge Injection	1.5pC	5pC	—	3pC
Channel Capacitance (CS(off), CD(off))	5pF, 5pF	2.5pF	7pF	8pF, 8pF
Current - Leakage (IS(off)) (Max)	1nA	100nA	10pA (Typ)	500pA
Crosstalk	-80dB @ 1MHz	-82dB @ 1MHz	-82dB @ 1MHz	—
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

PI5A4599BCEX (Diodes Incorporated): This part maintains the same manufacturer lineage and identical package form factor as the PI5A4599ACEX. It operates within an expanded lower supply voltage range (1.6V minimum) and offers improved bandwidth performance at 350MHz. The on-state resistance increases to 11Ohm, which remains within acceptable tolerance for most low-frequency switching applications. Product status is Last Time Buy, indicating limited future availability. This part is suitable for direct replacement in designs where the slightly higher resistance and expanded voltage range do not create functional constraints.

ADG779BKSZ-REEL7 (Analog Devices Inc.): This part offers the lowest on-state resistance at 5Ohm and superior leakage characteristics (10pA typical). It maintains full package compatibility and operates across 1.8V to 5.5V supply range. Product status is Active, ensuring long-term availability and supply chain stability. The 200MHz bandwidth and improved switching performance make this part suitable for applications requiring lower signal distortion and higher-frequency operation. This part is recommended for new designs or where supply continuity is critical.

MAX4599EXT+T (Analog Devices Inc./Maxim Integrated): This part features the highest on-state resistance at 60Ohm and is suitable only for applications where signal impedance is not a limiting factor. Product status is Active. The 200MHz bandwidth and moderate switching times support general-purpose multiplexing. This part should be selected only when resistance tolerance is not a design constraint or when cost optimization is prioritized over signal integrity.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and -40°C to 85°C operating temperature range, ensuring regulatory and environmental compatibility with the original PI5A4599ACEX specification.

Frequently Asked Questions (FAQ)

Q: Can PI5A4599BCEX directly replace PI5A4599ACEX in existing designs?

A: PI5A4599BCEX is mechanically and functionally compatible, sharing identical SC-70-6 packaging and SPDT 2:1 topology. The on-state resistance increases from 8Ohm to 11Ohm, which is acceptable for most audio and low-frequency signal routing applications. Verify that your circuit design tolerates the 3Ohm resistance increase and the expanded lower supply voltage range (1.6V minimum vs. 2V minimum).

Q: What is the primary difference between ADG779BKSZ-REEL7 and PI5A4599ACEX?

A: ADG779BKSZ-REEL7 offers superior on-state resistance (5Ohm vs. 8Ohm), lower leakage current (10pA typical vs. 1nA), and higher bandwidth (200MHz vs. 30MHz). Both parts share identical SC-70-6 packaging and SPDT topology. The ADG779BKSZ-REEL7 is recommended for applications requiring lower signal distortion and higher-frequency operation. Supply voltage range differs slightly: ADG779BKSZ-REEL7 operates 1.8V to 5.5V versus PI5A4599ACEX at 2V to 6V.

Q: Is MAX4599EXT+T suitable as a substitute for PI5A4599ACEX?

A: MAX4599EXT+T maintains package compatibility and SPDT 2:1 topology but features significantly higher on-state resistance (60Ohm vs. 8Ohm). This part is suitable only for applications where signal impedance is not critical or where the circuit design accommodates higher resistance. For audio, RF, or precision analog switching applications, MAX4599EXT+T is not recommended as a direct substitute.

Q: Are all substitute parts available in the same packaging?

A: Yes. PI5A4599ACEX, PI5A4599BCEX, ADG779BKSZ-REEL7, and MAX4599EXT+T are all available in 6-TSSOP, SC-88, and SOT-363 package families. The supplier device package designation is SC-70-6 for all parts, ensuring mechanical and electrical compatibility on PCB layouts designed for the original PI5A4599ACEX.

Q: Which substitute part offers the best long-term supply availability?

A: ADG779BKSZ-REEL7 and MAX4599EXT+T both carry Active product status, indicating ongoing manufacturing and distribution support. PI5A4599BCEX is classified as Last Time Buy, indicating limited future availability. For new designs or applications requiring extended product lifecycle support, ADG779BKSZ-REEL7 is the recommended choice.

Q: Do all substitute parts meet the same compliance and environmental standards?

A: Yes. All substitute parts—PI5A4599BCEX, ADG779BKSZ-REEL7, and MAX4599EXT+T—are ROHS3 compliant, carry MSL Level 1 (Unlimited) moisture sensitivity rating, and operate across the -40°C to 85°C temperature range. All parts are REACH Unaffected and classified under ECCN EAR99, matching the regulatory profile of the original PI5A4599ACEX.

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