PI5A127UEX Equivalent & Substitute Parts

Part Overview

The PI5A127UEX is a 2-circuit IC switch manufactured by Diodes Incorporated, configured as SPST-NC (Single Pole Single Throw - Normally Closed) with 10Ohm on-state resistance in an 8-MSOP package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The PI5A127UEX operates across a 2V to 6V single supply range with fast switching characteristics (15ns turn-on, 7ns turn-off) and low charge injection of 1.6pC, suitable for high-speed signal switching applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI5A127UEX
Manufacturer	Diodes Incorporated
Category	Interface
Switch Circuit Configuration	SPST - NC
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	10Ohm
Channel-to-Channel Matching (ΔRon)	200mOhm
Voltage - Supply, Single (V+)	2V ~ 6V
Switch Time (Ton, Toff) (Max)	15ns, 7ns
-3dB Bandwidth	326MHz
Charge Injection	1.6pC
Channel Capacitance (CS(off), CD(off))	5.5pF, 5.5pF
Current - Leakage (IS(off)) (Max)	200pA (Typ)
Crosstalk	-43dB @ 10MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI5A127UEX is determined by the following critical parameters:

Switch Circuit Configuration: The PI5A127UEX uses SPST-NC (Normally Closed). Substitute parts with SPST-NO (Normally Open) configuration require circuit-level design changes and are not direct pin-compatible replacements without logic inversion.
Number of Circuits & Multiplexer Configuration: All substitutes must maintain 2 circuits in a 1:1 multiplexer/demultiplexer configuration.
Package Type: The 8-MSOP package footprint is the primary mechanical constraint. Substitutes in 8-LSSOP or 8-MSOP packages are mechanically compatible.
On-State Resistance: The PI5A127UEX specifies 10Ohm maximum. Substitutes with higher on-state resistance (600mOhm) introduce signal attenuation and are suitable only for applications tolerant of increased insertion loss.
Supply Voltage Range: The PI5A127UEX operates at 2V ~ 6V. Substitutes must support overlapping or compatible voltage ranges.
Operating Temperature: All substitutes must support the -40°C ~ 85°C range or broader.

The substitute parts listed below are functionally equivalent in circuit topology and package form factor, with trade-offs in on-state resistance, switching speed, and supply voltage compatibility.

Parameter Comparison

Parameter	PI5A127UEX	ADG821BRMZ	ADG821BRMZ-REEL7	SN74AUC2G66DCTR	SN74LVC2G66DCTR	TS5A2066DCTR
Manufacturer	Diodes Inc.	Analog Devices	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments
Switch Circuit	SPST - NC	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2	2	2	2
Multiplexer Configuration	1:1	1:1	1:1	1:1	1:1	1:1
On-State Resistance (Max)	10Ohm	600mOhm	600mOhm	15Ohm	10Ohm	10Ohm
Channel-to-Channel Matching (ΔRon)	200mOhm	160mOhm	160mOhm	1Ohm (Max)	2Ohm (Max)	1Ohm
Voltage - Supply, Single (V+)	2V ~ 6V	1.8V ~ 5.5V	1.8V ~ 5.5V	0.8V ~ 2.7V	1.65V ~ 5.5V	1.65V ~ 5.5V
Switch Time Ton (Max)	15ns	45ns	45ns	2.3ns	3.9ns	5.8ns
Switch Time Toff (Max)	7ns	16ns	16ns	2ns	6.3ns	3.6ns
-3dB Bandwidth	326MHz	24MHz	24MHz	500MHz	300MHz	300MHz
Charge Injection	1.6pC	15pC	15pC	—	—	1pC
Channel Capacitance (CS(off), CD(off))	5.5pF, 5.5pF	85pF, 98pF	85pF, 98pF	3pF	6pF	5.5pF, 5.5pF
Current - Leakage (IS(off)) (Max)	200pA (Typ)	250pA	250pA	1µA	100nA	30nA
Crosstalk	-43dB @ 10MHz	-82dB @ 1MHz	-82dB @ 1MHz	-60dB @ 1MHz	-58dB @ 1MHz	-68dB @ 10MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-LSSOP, 8-MSOP	8-LSSOP, 8-MSOP	8-LSSOP, 8-MSOP
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity, matching the compliance profile of the PI5A127UEX. Selection among substitutes depends on application-specific requirements:

TS5A2066DCTR provides the closest electrical match to the PI5A127UEX with 10Ohm on-state resistance, 1pC charge injection, and 5.5pF channel capacitance. This part is active in production with broad supply voltage compatibility (1.65V ~ 5.5V) and operates within the -40°C ~ 85°C temperature range. The SPST-NO configuration requires circuit-level logic inversion compared to the PI5A127UEX SPST-NC topology.

SN74LVC2G66DCTR offers 10Ohm on-state resistance matching the PI5A127UEX with extended supply voltage range (1.65V ~ 5.5V). This part has higher leakage current (100nA) and slightly elevated channel capacitance (6pF) but maintains active production status and full compliance certifications.

SN74AUC2G66DCTR is suitable for ultra-low voltage applications (0.8V ~ 2.7V) with superior switching speed (2.3ns turn-on, 2ns turn-off) and highest bandwidth (500MHz). The 15Ohm on-state resistance introduces minimal insertion loss. This part is appropriate for high-speed signal routing in low-voltage domains.

ADG821BRMZ and ADG821BRMZ-REEL7 (identical electrical specifications, different packaging) feature 600mOhm on-state resistance with extended operating temperature range (-40°C ~ 125°C). These parts are suitable only for applications where higher insertion loss is acceptable. The 24MHz bandwidth and 15pC charge injection limit use to lower-frequency switching applications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI5A127UEX with TS5A2066DCTR without circuit modifications?

A: No. The PI5A127UEX is SPST-NC (Normally Closed), while TS5A2066DCTR is SPST-NO (Normally Open). This requires inverting the control logic at the circuit level. Pin-to-pin compatibility exists, but functional behavior is inverted.

Q: Which substitute has the lowest on-state resistance?

A: TS5A2066DCTR, SN74LVC2G66DCTR, and PI5A127UEX all specify 10Ohm maximum on-state resistance. ADG821BRMZ and ADG821BRMZ-REEL7 have 600mOhm, introducing significantly higher insertion loss. SN74AUC2G66DCTR specifies 15Ohm.

Q: Are all substitutes available in the same 8-MSOP package?

A: Yes. All substitutes are available in 8-MSOP or 8-LSSOP packages with compatible 0.118" to 0.110" body widths and 3.00mm to 2.80mm widths. PCB footprints are mechanically compatible.

Q: What is the supply voltage overlap between PI5A127UEX and the substitutes?

A: PI5A127UEX operates at 2V ~ 6V. TS5A2066DCTR and SN74LVC2G66DCTR support 1.65V ~ 5.5V (overlap: 2V ~ 5.5V). ADG821BRMZ supports 1.8V ~ 5.5V (overlap: 2V ~ 5.5V). SN74AUC2G66DCTR supports only 0.8V ~ 2.7V (no overlap above 2.7V).

Q: Which substitute is best for high-frequency applications?

A: SN74AUC2G66DCTR offers the highest bandwidth (500MHz) and fastest switching times (2.3ns turn-on, 2ns turn-off). TS5A2066DCTR and SN74LVC2G66DCTR both provide 300MHz bandwidth, suitable for most high-speed applications. ADG821BRMZ is limited to 24MHz and is unsuitable for high-frequency switching.

Q: Do all substitutes support the full -40°C ~ 85°C operating temperature range?

A: Yes. TS5A2066DCTR, SN74AUC2G66DCTR, and SN74LVC2G66DCTR all support -40°C ~ 85°C. ADG821BRMZ and ADG821BRMZ-REEL7 support the extended range of -40°C ~ 125°C.

Q: What is the difference between ADG821BRMZ and ADG821BRMZ-REEL7?

A: Both parts are electrically identical with identical specifications. The difference is packaging: ADG821BRMZ is supplied in Tube packaging, while ADG821BRMZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel format. Select based on your procurement and assembly requirements.

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