MAX494CSD Equivalent & Substitute Parts

Part Overview

The MAX494CSD is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface-mount package. This device is classified as obsolete and operates across a supply voltage range of 2.7 V to 6 V with rail-to-rail output capability. Due to its obsolete status, equivalent and substitute parts are necessary for new designs, production continuations, and system upgrades. Substitute parts must maintain functional compatibility through matching electrical specifications and identical package geometry while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	0.2	V/µs
Gain Bandwidth Product	500	kHz
Current - Input Bias	25	nA
Voltage - Input Offset	200	µV
Current - Supply (x4 Channels)	150	µA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	6	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MAX494CSD is determined by strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Package geometry: 14-SOIC (0.154", 3.90mm Width) — mandatory for PCB compatibility
Number of circuits: 4 independent amplifier channels
Output configuration: Rail-to-rail output capability
Supply voltage range: Minimum 2.7 V, maximum 6 V (or compatible superset)
Mounting type: Surface mount

Secondary Compatibility Parameters:

Slew rate: 0.2 V/µs or greater
Gain bandwidth product: 500 kHz or greater
Input bias current: 25 nA or lower
Input offset voltage: 200 µV or lower
Output current per channel: 30 mA or greater
Supply current: 150 µA (x4 channels) or lower

Substitute parts are grouped into two categories: direct equivalents (identical base product with different packaging or compliance status) and functional alternatives (different manufacturers with equivalent or superior electrical performance within the same package).

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	RoHS Status	Package
MAX494CSD	Analog Devices	Obsolete	General Purpose	0.2	500	25	200	150	30	2.7	6	0–70	Non-compliant	14-SOIC
MAX494CSD+	Analog Devices	Active	General Purpose	0.2	500	25	200	150	30	2.7	6	0–70	ROHS3 Compliant	14-SOIC
AD8609ARZ-REEL	Analog Devices	Active	CMOS	0.1	400	0.002	12	40	70	1.8	5	−40–125	ROHS3 Compliant	14-SOIC
AD8609ARZ-REEL7	Analog Devices	Active	CMOS	0.1	400	0.002	12	40	70	1.8	5	−40–125	ROHS3 Compliant	14-SOIC
MCP624-E/SL	Microchip Technology	Active	General Purpose	10	20000	0.005	200	2500	70	2.5	5.5	−40–125	ROHS3 Compliant	14-SOIC
MCP624T-E/SL	Microchip Technology	Active	General Purpose	10	20000	0.005	200	2500	70	2.5	5.5	−40–125	ROHS3 Compliant	14-SOIC
TLV2454AID	Texas Instruments	Active	General Purpose	0.11	220	500	300	23	10	2.7	6	−40–125	ROHS3 Compliant	14-SOIC
TLV2454AIDR	Texas Instruments	Active	General Purpose	0.11	220	500	300	23	10	2.7	6	−40–125	ROHS3 Compliant	14-SOIC
TLV2454CD	Texas Instruments	Obsolete	General Purpose	0.11	220	500	300	23	10	2.7	6	0–70	ROHS3 Compliant	14-SOIC
TLV2454ID	Texas Instruments	Active	General Purpose	0.11	220	500	300	23	10	2.7	6	−40–125	ROHS3 Compliant	14-SOIC
TLV2454IDR	Texas Instruments	Active	General Purpose	0.11	220	500	300	23	10	2.7	6	−40–125	ROHS3 Compliant	14-SOIC

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

MAX494CSD+ is the direct successor to MAX494CSD. Both parts share identical electrical specifications, package geometry, and pinout. The primary distinction is product status: MAX494CSD+ is active and ROHS3 compliant, whereas MAX494CSD is obsolete and non-compliant. Selection of MAX494CSD+ is appropriate for new production runs and design continuations requiring immediate compliance with RoHS regulations.

Functional Alternatives (Extended Temperature Range & Active Status):

TLV2454 series (Texas Instruments) parts—including TLV2454AID, TLV2454AIDR, TLV2454ID, and TLV2454IDR—provide functional substitution with active product status and extended operating temperature range (−40°C to 125°C versus 0°C to 70°C). These parts maintain supply voltage compatibility (2.7 V to 6 V) and identical package geometry. Trade-offs include lower slew rate (0.11 V/µs versus 0.2 V/µs), reduced gain bandwidth product (220 kHz versus 500 kHz), higher input bias current (500 pA versus 25 nA), and reduced output current per channel (10 mA versus 30 mA). Selection is appropriate for applications where extended temperature operation and active product status outweigh performance reduction.

Performance-Enhanced Alternative (Superior Specifications):

MCP624-E/SL and MCP624T-E/SL (Microchip Technology) offer significantly enhanced performance: slew rate of 10 V/µs, gain bandwidth product of 20 MHz, and extended temperature range (−40°C to 125°C). Supply voltage range is 2.5 V to 5.5 V, which overlaps the MAX494CSD range. Output current per channel is 70 mA, exceeding the original specification. Supply current is higher at 2.5 mA (x4 channels). These parts are suitable for applications requiring higher bandwidth and faster transient response while maintaining 14-SOIC package compatibility.

CMOS Alternative (Ultra-Low Input Bias Current):

AD8609ARZ-REEL and AD8609ARZ-REEL7 (Analog Devices) employ CMOS technology, delivering input bias current of 0.2 pA (versus 25 nA) and input offset voltage of 12 µV (versus 200 µV). Supply voltage range is 1.8 V to 5 V, which is narrower than MAX494CSD. Slew rate is 0.1 V/µs and gain bandwidth product is 400 kHz. These parts are suitable for precision measurement applications where ultra-low input bias current is critical.

All substitute parts maintain 14-SOIC package geometry and surface-mount configuration. Selection should be based on application requirements for temperature range, bandwidth, input bias current, and compliance certifications.

Frequently Asked Questions (FAQ)

Q1: Can MAX494CSD+ be used as a direct replacement for MAX494CSD?

A: Yes. MAX494CSD+ is electrically and mechanically identical to MAX494CSD. Both parts feature identical pinout, supply voltage range (2.7 V to 6 V), slew rate (0.2 V/µs), gain bandwidth product (500 kHz), and 14-SOIC package geometry. The primary difference is product status: MAX494CSD+ is active and ROHS3 compliant, while MAX494CSD is obsolete and non-compliant. No circuit modifications are required for substitution.

Q2: What are the key differences between MAX494CSD and TLV2454 series parts?

A: Both families maintain identical supply voltage range (2.7 V to 6 V) and 14-SOIC package geometry. MAX494CSD offers higher slew rate (0.2 V/µs versus 0.11 V/µs), higher gain bandwidth product (500 kHz versus 220 kHz), lower input bias current (25 nA versus 500 pA), and higher output current per channel (30 mA versus 10 mA). TLV2454 series provides extended operating temperature range (−40°C to 125°C versus 0°C to 70°C) and active product status. Selection depends on whether performance specifications or temperature range and compliance are prioritized.

Q3: Are MCP624 parts suitable for MAX494CSD replacement in all applications?

A: MCP624-E/SL and MCP624T-E/SL are functionally compatible in terms of package geometry and supply voltage overlap (2.5 V to 5.5 V encompasses the MAX494CSD range of 2.7 V to 6 V). However, MCP624 parts feature significantly higher supply current (2.5 mA x4 channels versus 150 µA), which may impact power budget in battery-powered or low-power applications. MCP624 parts are suitable for applications where higher bandwidth (20 MHz versus 500 kHz) and faster slew rate (10 V/µs versus 0.2 V/µs) are required.

Q4: What is the significance of packaging designations (Tube, Tape & Reel, Cut Tape)?

A: Packaging designations indicate the physical form in which parts are supplied. Tube packaging is suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is standard for automated pick-and-place assembly and high-volume manufacturing. Cut Tape (CT) & Digi-Reel® is an intermediate option. All three packaging types contain electrically identical parts in the same 14-SOIC case. Selection is based on assembly process requirements, not electrical performance.

Q5: Why is input bias current important in substitution decisions?

A: Input bias current affects circuit performance in high-impedance applications, precision instrumentation, and transimpedance amplifier configurations. MAX494CSD specifies 25 nA input bias current. TLV2454 series specifies 500 pA, which is 20 times higher and may introduce additional error in precision circuits. AD8609 CMOS parts specify 0.2 pA, which is significantly lower. For applications sensitive to input bias current, AD8609 or MCP624 parts may be preferred despite other trade-offs.

Q6: Can AD8609 parts replace MAX494CSD in all voltage ranges?

A: No. AD8609 parts operate across 1.8 V to 5 V, which does not fully encompass the MAX494CSD range of 2.7 V to 6 V. Applications requiring operation at 5.5 V or 6 V supply voltage cannot use AD8609 parts. Verification of actual supply voltage requirements is necessary before substitution.

Q7: What does "obsolete" product status mean for component selection?

A: Obsolete status indicates that the manufacturer has discontinued production and support. MAX494CSD is classified as obsolete, meaning new inventory may be limited and future availability is not guaranteed. Active alternatives such as MAX494CSD+, TLV2454 series, MCP624 series, and AD8609 series are recommended for new designs and production continuations to ensure long-term supply chain stability.

Q8: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. MAX494CSD is RoHS non-compliant. If RoHS compliance is a design requirement, MAX494CSD+ or any of the active substitute parts (TLV2454 series, MCP624 series, AD8609 series) must be selected.

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