MAX4503ESA Equivalent & Substitute Parts

Part Overview

The MAX4503ESA is a single-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a high-speed electronic switch with 250Ω on-state resistance in an 8-SOIC surface mount package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Multiplexer/Demultiplexer Configuration	1:1
Number of Circuits	1
On-State Resistance (Max)	250Ω
Supply Voltage (Dual)	±1V ~ 6V
Operating Temperature Range	-40°C ~ 85°C (TA)
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	3pF, 3pF
Current - Leakage (IS(off)) (Max)	1nA
Switch Time (Ton, Toff) (Max)	150ns, 100ns

Substitute Part Grouping Explanation

Substitution of the MAX4503ESA is based on strict equivalence of the following electrical and mechanical parameters:

Critical Matching Parameters:

Switch circuit topology: SPST - NO configuration
Multiplexer/demultiplexer ratio: 1:1
Number of circuits: 1
Package type: 8-SOIC form factor with identical 0.154" (3.90mm) width
Supply voltage range: ±1V ~ 6V dual supply compatibility
Operating temperature range: -40°C ~ 85°C

Allowable Variations: On-state resistance (Ron) may be lower than the original 250Ω specification, as this represents an improvement in performance without affecting circuit compatibility. Switch timing parameters (Ton, Toff) may be faster, and leakage current may be lower, both representing performance enhancements. Channel capacitance and charge injection may differ within acceptable ranges for analog switch applications.

The Texas Instruments TS12A4516 series parts meet all critical matching parameters and are therefore valid substitutes for the obsolete MAX4503ESA.

Parameter Comparison

Parameter	MAX4503ESA	TS12A4516D	TS12A4516DR
Manufacturer	Analog Devices Inc./Maxim Integrated	Texas Instruments	Texas Instruments
Switch Circuit Type	SPST - NO	SPST - NO	SPST - NO
Multiplexer/Demultiplexer Configuration	1:1	1:1	1:1
Number of Circuits	1	1	1
On-State Resistance (Max)	250Ω	20Ω	20Ω
Supply Voltage (Dual)	±1V ~ 6V	±1V ~ 6V	±1V ~ 6V
Switch Time Ton (Max)	150ns	75ns	75ns
Switch Time Toff (Max)	100ns	45ns	45ns
-3dB Bandwidth	—	464MHz	464MHz
Charge Injection	1pC	-13pC	-13pC
Channel Capacitance (CS(off), CD(off))	3pF, 3pF	5.5pF, 5.5pF	5.5pF, 5.5pF
Current - Leakage (IS(off)) (Max)	1nA	5nA	5nA
Operating Temperature Range	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	—	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

Both TS12A4516D and TS12A4516DR are functionally equivalent substitutes for the MAX4503ESA based on matching switch topology, circuit configuration, package form factor, and supply voltage specifications.

Product Status Consideration: The MAX4503ESA is obsolete, while both Texas Instruments alternatives are active products with ongoing manufacturer support and availability.

Compliance Advantage: The TS12A4516 series parts are ROHS3 compliant, whereas the MAX4503ESA is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulations.

Packaging Selection: TS12A4516D is supplied in Tube packaging, suitable for lower-volume applications and manual assembly. TS12A4516DR is supplied in Tape & Reel (TR) format, appropriate for high-volume automated production environments.

Performance Characteristics: The TS12A4516 series offers superior electrical performance with significantly lower on-state resistance (20Ω vs. 250Ω), faster switching times, and higher bandwidth capability. These improvements are backward-compatible with the MAX4503ESA application space.

Frequently Asked Questions (FAQ)

Q: Can TS12A4516D and TS12A4516DR be used interchangeably with MAX4503ESA?

A: Yes. Both parts are functionally equivalent substitutes. The electrical performance and package form factor are compatible. The difference between TS12A4516D and TS12A4516DR is packaging format only (Tube vs. Tape & Reel), not electrical specifications.

Q: What is the primary advantage of switching to TS12A4516 series parts?

A: The TS12A4516 series offers lower on-state resistance (20Ω vs. 250Ω), faster switching response, and ROHS3 compliance. These represent performance improvements and regulatory alignment compared to the obsolete MAX4503ESA.

Q: Are there any electrical parameter differences that affect circuit design?

A: The TS12A4516 series has higher channel capacitance (5.5pF vs. 3pF) and slightly higher leakage current (5nA vs. 1nA). These differences are within acceptable ranges for analog switch applications and do not require circuit redesign for most standard applications.

Q: Which packaging option should I select?

A: Select TS12A4516D (Tube) for prototype development, low-volume production, or manual assembly processes. Select TS12A4516DR (Tape & Reel) for high-volume automated manufacturing and pick-and-place assembly operations.

Q: Is the 8-SOIC package pinout identical between all three parts?

A: Yes. All three parts use the 8-SOIC package with identical 0.154" (3.90mm) width and are pin-compatible. PCB layout and footprint remain unchanged during substitution.

Q: What is the impact of the lower on-state resistance on my circuit?

A: Lower on-state resistance (20Ω vs. 250Ω) reduces voltage drop across the switch and improves signal integrity. This is a performance enhancement that benefits most applications without requiring design modifications.

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