Equivalent & Substitute Parts for MAX4291EXK-T

Part Overview

The MAX4291EXK-T is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, housed in a 5-TSSOP (SC-70-5) surface-mount package. This device features rail-to-rail output capability and operates across a supply voltage range of 1.8 V to 5.5 V, making it suitable for low-voltage analog signal processing applications.

The MAX4291EXK-T has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements. Substitute parts listed below maintain electrical and mechanical compatibility within the specified parameter tolerances for this product category.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Package / Case	5-TSSOP, SC-70-5, SOT-353	—
Mounting Type	Surface Mount	—
Voltage - Supply Span (Min)	1.8	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 85	°C
Slew Rate	0.2	V/µs
Gain Bandwidth Product	500	kHz
Current - Input Bias	15	nA
Voltage - Input Offset	400	µV
Current - Supply	100	µA
Current - Output / Channel	20	mA
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MAX4291EXK-T are selected based on strict electrical and mechanical compatibility criteria. All substitute parts must satisfy the following mandatory conditions:

Mechanical Compatibility:

Package type: 5-TSSOP, SC-70-5, or SOT-353
Mounting type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Electrical Compatibility:

Output type: Rail-to-Rail
Number of circuits: 1
Supply voltage range: Minimum 1.8 V, Maximum 5.5 V
Operating temperature range: Minimum -40°C, Maximum ≥85°C

Substitute parts are grouped into two categories based on performance characteristics:

Category 1: Direct Electrical Equivalents Parts that maintain the same or lower slew rate, gain bandwidth product, and input bias current specifications as the MAX4291EXK-T, ensuring drop-in compatibility for applications with identical performance requirements.

Category 2: Enhanced Performance Alternatives Parts that exceed the MAX4291EXK-T specifications in slew rate, gain bandwidth product, or input bias current. These parts are suitable for applications requiring improved performance margins while maintaining backward compatibility with the original design envelope.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA/pA)	Input Offset (µV)	Supply Current (µA)	Temp Range (°C)	RoHS Status
MAX4291EXK-T	Analog Devices / Maxim	Obsolete	0.2	500	15 nA	400	100	-40 to 85	Non-compliant
MAX4291EXK+T	Analog Devices / Maxim	Active	0.2	500	15 nA	400	100	-40 to 85	ROHS3 Compliant
OPA313IDCKT	Texas Instruments	Active	0.5	1000	0.2 pA	500	50	-40 to 125	ROHS3 Compliant
OPA313IDCKR	Texas Instruments	Active	0.5	1000	0.2 pA	500	50	-40 to 125	ROHS3 Compliant
OPA316IDCKR	Texas Instruments	Active	6	10000	5 pA	500	400	-40 to 125	ROHS3 Compliant
OPA316IDCKT	Texas Instruments	Active	6	10000	5 pA	500	400	-40 to 125	ROHS3 Compliant
OPA317IDCKR	Texas Instruments	Active	0.15	300	275 pA	20	21	-40 to 125	ROHS3 Compliant
OPA317IDCKT	Texas Instruments	Active	0.15	300	275 pA	20	21	-40 to 125	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MAX4291EXK+T

The MAX4291EXK+T is the direct equivalent of the MAX4291EXK-T with identical electrical specifications. This part is manufactured by the same supplier (Analog Devices Inc./Maxim Integrated) and maintains 100% parameter compatibility. The MAX4291EXK+T holds Active product status and is ROHS3 compliant, addressing the regulatory compliance gap of the obsolete MAX4291EXK-T. This part is available in Tape & Reel packaging with 35,200 units in stock, providing supply chain continuity with minimal design modification.

Secondary Recommendations: OPA313IDCKT and OPA313IDCKR

The OPA313 series (Texas Instruments) provides enhanced performance characteristics while maintaining electrical compatibility. Both OPA313IDCKT and OPA313IDCKR feature improved slew rate (0.5 V/µs vs. 0.2 V/µs), higher gain bandwidth product (1 MHz vs. 500 kHz), and significantly lower input bias current (0.2 pA vs. 15 nA). Operating temperature range extends to 125°C. These parts are suitable for applications requiring improved signal fidelity and lower noise performance. OPA313IDCKR is available in Cut Tape & Digi-Reel packaging (18,600 units in stock); OPA313IDCKT is available in Tape & Reel packaging (2,100 units in stock).

Tertiary Recommendations: OPA316IDCKR and OPA316IDCKT

The OPA316 series (Texas Instruments) offers significantly enhanced performance for high-speed applications. Slew rate reaches 6 V/µs with gain bandwidth product of 10 MHz. Supply current increases to 400 µA. These parts are suitable for applications requiring fast transient response and wide bandwidth. Both variants are ROHS3 compliant and rated to 125°C. OPA316IDCKR (4,935 units) and OPA316IDCKT (3,691 units) are available in Tape & Reel packaging.

Specialized Recommendation: OPA317IDCKR and OPA317IDCKT

The OPA317 series (Texas Instruments) is a zero-drift amplifier offering exceptional input offset voltage performance (20 µV vs. 400 µV). This part is suitable for precision measurement and low-offset applications. Slew rate is 0.15 V/µs and gain bandwidth product is 300 kHz. Supply current is minimal at 21 µA. Both variants are ROHS3 compliant and rated to 125°C. OPA317IDCKR (34,351 units) and OPA317IDCKT (5,513 units) are available in Tape & Reel packaging.

All substitute parts maintain the 5-TSSOP (SC-70-5) package format, surface-mount configuration, and Moisture Sensitivity Level 1 (Unlimited) rating. Selection should be based on application-specific performance requirements and supply voltage constraints.

Frequently Asked Questions (FAQ)

Q1: Can MAX4291EXK+T be used as a direct replacement for MAX4291EXK-T?

A: Yes. The MAX4291EXK+T is electrically and mechanically identical to the MAX4291EXK-T. Both parts feature identical slew rate (0.2 V/µs), gain bandwidth product (500 kHz), input bias current (15 nA), and input offset voltage (400 µV). The primary difference is product status and RoHS compliance. MAX4291EXK+T is Active and ROHS3 compliant, while MAX4291EXK-T is Obsolete and non-compliant. No circuit modifications are required for substitution.

Q2: What are the packaging differences between the substitute parts?

A: All substitute parts use the 5-TSSOP (SC-70-5, SOT-353) package format. Packaging variants differ in tape configuration: Tape & Reel (TR) is standard for reel-based automated assembly; Cut Tape (CT) & Digi-Reel® is suitable for lower-volume or mixed-component pick-and-place operations. Package footprint and pin configuration remain identical across all parts.

Q3: Which substitute part offers the best performance improvement?

A: The OPA316 series provides the most significant performance enhancement with slew rate of 6 V/µs (30× improvement) and gain bandwidth product of 10 MHz (20× improvement). However, supply current increases to 400 µA. The OPA313 series offers a balanced improvement with 2.5× slew rate increase and 2× bandwidth increase while maintaining lower supply current (50 µA). Selection depends on application requirements for speed versus power consumption.

Q4: Are all substitute parts suitable for the full -40°C to 85°C temperature range of the original part?

A: Yes. All substitute parts are rated for -40°C to 125°C, which exceeds the original MAX4291EXK-T specification of -40°C to 85°C. This provides additional thermal margin for applications operating at elevated temperatures.

Q5: What is the significance of the OPA317 zero-drift architecture?

A: The OPA317 employs zero-drift amplifier technology, achieving input offset voltage of 20 µV compared to 400 µV for the MAX4291EXK-T. This 20× improvement in offset voltage is critical for precision analog applications such as sensor signal conditioning, data acquisition, and instrumentation where offset drift and temperature stability are performance-limiting factors. The OPA317 is not a general-purpose replacement but a specialized alternative for precision applications.

Q6: How do input bias current differences affect circuit design?

A: The MAX4291EXK-T specifies 15 nA input bias current. The OPA313 series reduces this to 0.2 pA (75,000× lower), while the OPA317 increases it to 275 pA. Lower input bias current reduces errors in high-impedance circuits and transimpedance amplifier configurations. Higher input bias current may require source impedance compensation in sensitive applications. Circuit redesign is not required for substitution, but performance may improve with lower-bias alternatives.

Q7: What is the impact of supply current differences on power budget?

A: The MAX4291EXK-T draws 100 µA. The OPA313 series reduces supply current to 50 µA (50% reduction), beneficial for battery-powered applications. The OPA316 series increases supply current to 400 µA (4× increase) due to higher bandwidth capability. The OPA317 series minimizes supply current at 21 µA, suitable for ultra-low-power applications. Selection should align with system power budget constraints.

Q8: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original MAX4291EXK-T is RoHS non-compliant. This compliance difference is significant for applications subject to RoHS regulations in the European Union and other jurisdictions. The MAX4291EXK+T and all Texas Instruments alternatives meet current RoHS3 requirements.

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