MAX4234ASD Equivalent & Substitute Parts

Part Overview

The MAX4234ASD is a CMOS quad-channel amplifier manufactured by Analog Devices Inc./Maxim Integrated, featuring rail-to-rail output capability in a 14-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MAX4234ASD operates across a 2.7V to 5.5V supply range with a 10 MHz gain bandwidth product and 10V/µs slew rate, suitable for low-power signal conditioning applications requiring high input impedance and minimal bias current.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	10	V/µs
Gain Bandwidth Product	10	MHz
Current - Input Bias	1	pA
Voltage - Input Offset	850	µV
Current - Supply (x4 Channels)	1.2	mA
Current - Output / Channel	200	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 125	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MAX4234ASD is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

Number of Circuits: 4 channels required
Output Type: Rail-to-Rail capability mandatory
Package / Case: 14-SOIC form factor (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 2.7V to Maximum 5.5V overlap required
Operating Temperature: Support for -40°C to 125°C range or compatible subset

Secondary Electrical Parameters for Compatibility Assessment:

Slew Rate: 10V/µs (MAX4234ASD baseline)
Gain Bandwidth Product: 10 MHz (MAX4234ASD baseline)
Current - Input Bias: 1 pA (MAX4234ASD baseline)
Voltage - Input Offset: 850 µV (MAX4234ASD baseline)
Current - Supply: 1.2mA x4 Channels (MAX4234ASD baseline)
Current - Output / Channel: 200 mA (MAX4234ASD baseline)

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (CMOS Amplifiers with Matching Electrical Performance) Parts maintaining CMOS amplifier topology with comparable slew rate, gain bandwidth product, and input bias current specifications. These parts preserve the original design intent and performance envelope.

Category 2: Functional Alternatives (General Purpose Amplifiers with Rail-to-Rail Output) Parts offering rail-to-rail output in 14-SOIC packaging with compatible supply voltage range but differing electrical characteristics. These parts accommodate applications where the specific electrical performance of the MAX4234ASD is not critical, provided the functional requirements (quad-channel, rail-to-rail, 14-SOIC) are met.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current x4 (mA)	Output Current (mA)	Temp Range (°C)	Product Status
MAX4234ASD	Analog Devices / Maxim	CMOS	10	10	1	850	1.2	200	-40 to 125	Obsolete
MAX4234ASD+	Analog Devices / Maxim	CMOS	10	10	1	850	1.2	200	-40 to 125	Active
TLV2624ID	Texas Instruments	CMOS	7	11	2	250	0.8	28	-40 to 125	Last Time Buy
OPA4343UA	Burr Brown	CMOS	6	5.5	0.2	2000	0.85	50	-40 to 85	Active
LMV324QD	Texas Instruments	General Purpose	1	1	15000	1700	0.41	40	-40 to 125	Last Time Buy
LMV324QDR	Texas Instruments	General Purpose	1	1	15000	1700	0.41	40	-40 to 125	Active
LMV324MX	National Semiconductor	General Purpose	1	1	15000	1700	0.41	160	-40 to 125	Active
MCP6024-E/SL	Microchip Technology	General Purpose	7	10	1	250	1	30	-40 to 125	Active
MCP6024-I/SL	Microchip Technology	General Purpose	7	10	1	500	1	30	-40 to 85	Active
MCP6024T-I/SL	Microchip Technology	General Purpose	7	10	1	500	1	30	-40 to 85	Active
TS464CDT	STMicroelectronics	General Purpose	4	12	200000	1000	2	—	-20 to 70	Active

Engineering Selection Recommendations

Direct Equivalent Selection:

MAX4234ASD+ is the primary direct equivalent. This part maintains identical electrical specifications to the MAX4234ASD while offering active product status. The only difference is packaging format (Tube vs. unspecified for original). This substitution requires no circuit redesign and preserves all performance characteristics. Inventory availability is significantly higher (2260 pcs vs. 720 pcs), supporting production continuity.

CMOS Amplifier Alternatives:

TLV2624ID and OPA4343UA are CMOS-based quad amplifiers with rail-to-rail output in 14-SOIC packaging. Both maintain the low input bias current characteristic of CMOS topology. TLV2624ID operates across the full -40°C to 125°C temperature range matching the MAX4234ASD, with comparable gain bandwidth product (11 MHz vs. 10 MHz) and superior input offset voltage (250 µV vs. 850 µV). However, TLV2624ID is classified as Last Time Buy. OPA4343UA offers the lowest input bias current (0.2 pA) but operates only to 85°C and exhibits higher input offset voltage (2 mV).

General Purpose Amplifier Alternatives:

LMV324QDR (Texas Instruments, Active status) and MCP6024-E/SL (Microchip Technology, Active status) provide functional substitution with rail-to-rail output and 14-SOIC packaging. LMV324QDR maintains the full -40°C to 125°C operating range with ROHS3 compliance and REACH Unaffected status. MCP6024-E/SL offers superior input offset voltage (250 µV) and operates across -40°C to 125°C. Both parts exhibit reduced slew rate and gain bandwidth product compared to MAX4234ASD, suitable for applications not requiring high-speed performance.

Compliance and Regulatory Considerations:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. LMV324MX is RoHS non-compliant and REACH Affected, limiting suitability for regulated applications. TS464CDT operates only to 70°C maximum, restricting use in extended temperature applications.

Product Status Impact:

MAX4234ASD+ (Active) is the preferred choice for new designs and production continuity. LMV324QD and TLV2624ID are Last Time Buy status, indicating limited future availability. All Microchip MCP6024 variants and LMV324QDR maintain Active status with robust inventory levels, supporting long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q1: Can MAX4234ASD+ directly replace MAX4234ASD without circuit modification?

A: Yes. MAX4234ASD+ is electrically and mechanically identical to MAX4234ASD. Both are CMOS quad amplifiers with 10V/µs slew rate, 10 MHz gain bandwidth product, 1 pA input bias current, and 14-SOIC packaging. The only difference is packaging format (Tube). No circuit redesign is required.

Q2: What are the key differences between CMOS and General Purpose amplifier substitutes?

A: CMOS amplifiers (MAX4234ASD+, TLV2624ID, OPA4343UA) feature extremely low input bias current (0.2 to 2 pA), making them suitable for high-impedance signal sources and applications requiring minimal input loading. General Purpose amplifiers (LMV324 series, MCP6024 series) exhibit higher input bias current (15 nA to 200 nA) but often provide lower input offset voltage and reduced supply current. Selection depends on application requirements for input impedance and power consumption.

Q3: Why do some substitutes have lower output current capability than MAX4234ASD?

A: Output current capability varies by design. MAX4234ASD provides 200 mA per channel, while alternatives like MCP6024 series provide only 30 mA per channel. Applications requiring high output current (driving low-impedance loads or capacitive loads) must verify substitute output current specifications. LMV324MX provides 160 mA per channel, offering intermediate capability.

Q4: Is temperature range compatibility critical for substitution?

A: Temperature range compatibility depends on application requirements. MAX4234ASD operates -40°C to 125°C. Substitutes like OPA4343UA and MCP6024-I/SL operate only to 85°C, unsuitable for extended temperature applications. LMV324QDR, LMV324QD, and MCP6024-E/SL maintain the full -40°C to 125°C range. Verify application temperature requirements before selection.

Q5: What is the significance of "Last Time Buy" product status?

A: Last Time Buy indicates the manufacturer will discontinue the part after a specified date. TLV2624ID and LMV324QD are Last Time Buy status, meaning inventory will eventually deplete with no future production. For new designs or long-term production, select Active status parts: MAX4234ASD+, LMV324QDR, or MCP6024 variants.

Q6: Are all substitutes RoHS3 compliant?

A: No. Most substitutes are ROHS3 compliant, but LMV324MX is RoHS non-compliant. For applications requiring RoHS compliance (consumer electronics, automotive, industrial), verify compliance status. MAX4234ASD+, TLV2624ID, LMV324QDR, and all MCP6024 variants are ROHS3 compliant.

Q7: Can I use TS464CDT as a substitute?

A: TS464CDT is not recommended as a primary substitute. While it provides quad-channel rail-to-rail output in 14-SOIC packaging, it operates only to 70°C maximum temperature (vs. 125°C for MAX4234ASD), has significantly higher input bias current (200 nA vs. 1 pA), and higher supply current (2 mA vs. 1.2 mA). Use only if application temperature range does not exceed 70°C and higher bias current is acceptable.

Q8: What packaging format differences exist among substitutes?

A: All substitutes use 14-SOIC (0.154", 3.90mm Width) surface mount package, maintaining mechanical compatibility. Packaging format variations include Tube, Cut Tape (CT) & Digi-Reel®, and unspecified. These differences affect handling and tape-and-reel compatibility but do not impact electrical performance or PCB footprint.

Q9: Which substitute offers the best input offset voltage performance?

A: MCP6024-E/SL and TLV2624ID both offer 250 µV input offset voltage, superior to MAX4234ASD (850 µV). OPA4343UA provides 2 mV offset voltage. For applications sensitive to input offset voltage drift and requiring precision signal conditioning, MCP6024-E/SL is recommended due to Active status and full temperature range support.

Q10: Are there supply chain advantages to selecting specific substitutes?

A: Yes. MCP6024T-I/SL has the highest inventory (20,800 pcs), followed by OPA4343UA (20,450 pcs) and LMV324QDR (3,000 pcs). MAX4234ASD+ has 2,260 pcs available. For applications requiring immediate availability and long-term supply security, MCP6024T-I/SL is advantageous. However, verify temperature range requirements, as MCP6024T-I/SL operates only to 85°C.

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