MAX4091ASA-T Equivalent & Substitute Parts

Part Overview

The MAX4091ASA-T is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, designed for rail-to-rail applications in 8-SOIC surface mount packaging. This device operates across a 2.7V to 6V supply range with a slew rate of 0.2V/µs and gain bandwidth product of 500 kHz. The MAX4091ASA-T is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility with the 8-SOIC package format and support the required electrical operating parameters.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	0.2	V/µs
Gain Bandwidth Product	500	kHz
Current - Input Bias	20	nA
Voltage - Input Offset	30	µV
Current - Supply	130	µA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	6	V
Operating Temperature	-40 to 125	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MAX4091ASA-T are grouped based on strict electrical and mechanical compatibility criteria. All substitute parts must meet the following requirements:

Primary Compatibility Criteria:

Package format: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Output configuration: Rail-to-Rail
Number of circuits: 1
Supply voltage range: Minimum 2.7V to maximum 6V overlap
Operating temperature range: Support for -40°C to 125°C or compatible subset
RoHS3 compliance

Substitution Categories:

Category 1: Direct Packaging Equivalent MAX4091ASA+T is the tape and reel variant of the same base product (MAX4091). This part maintains identical electrical specifications and is the direct equivalent for production environments requiring reel packaging.

Category 2: General Purpose Amplifiers with Compatible Parameters TLV2451AIDR, TLV2451AID, and TLV2451CD are general-purpose amplifiers in 8-SOIC packaging with rail-to-rail output. These parts operate within the 2.7V to 6V supply range and support the full -40°C to 125°C temperature range (TLV2451AIDR and TLV2451AID). While slew rate and gain bandwidth product differ, the functional classification and package compatibility establish substitution viability.

Category 3: Enhanced Performance Alternatives TLC4501IDR, TLC4501ID, and TLC4501CD are general-purpose amplifiers with improved slew rate (2.5V/µs) and gain bandwidth product (4.7 MHz) compared to the MAX4091ASA-T. These parts maintain 8-SOIC packaging and rail-to-rail output. TLC4501IDR and TLC4501ID support -40°C to 125°C operation; TLC4501CD operates 0°C to 70°C.

Category 4: Zero-Drift Amplifier Alternatives ISL28134IBZ, ISL28134IBZ-T13, and ISL28134IBZ-T7 are zero-drift amplifiers in 8-SOIC packaging with superior input offset voltage (0.2 µV) and input bias current (120 pA). These parts support 2.25V to 6V supply range and -40°C to 85°C operation, offering enhanced precision at the cost of increased supply current (675 µA).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA/pA)	Input Offset (µV)	Supply Current (µA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
MAX4091ASA-T	Analog Devices	General Purpose	0.2	500	20 nA	30	130	2.7	6	-40 to 125	8-SOIC	Obsolete
MAX4091ASA+T	Analog Devices	General Purpose	0.2	500	20 nA	30	130	2.7	6	-40 to 125	8-SOIC	Active
TLV2451AIDR	Texas Instruments	General Purpose	0.11	220	500 pA	300	23	2.7	6	-40 to 125	8-SOIC	Active
TLV2451AID	Texas Instruments	General Purpose	0.11	220	500 pA	300	23	2.7	6	-40 to 125	8-SOIC	Obsolete
TLV2451CD	Texas Instruments	General Purpose	0.11	220	500 pA	300	23	2.7	6	0 to 70	8-SOIC	Active
TLC4501IDR	Texas Instruments	General Purpose	2.5	4700	1 pA	10	1000	4	6	-40 to 125	8-SOIC	Active
TLC4501ID	Texas Instruments	General Purpose	2.5	4700	1 pA	10	1000	4	6	-40 to 125	8-SOIC	Last Time Buy
TLC4501CD	Texas Instruments	General Purpose	2.5	4700	1 pA	10	1000	4	6	0 to 70	8-SOIC	Last Time Buy
ISL28134IBZ	Renesas Electronics	Zero-Drift	1.5	3500	120 pA	0.2	675	2.25	6	-40 to 85	8-SOIC	Active
ISL28134IBZ-T13	Renesas Electronics	Zero-Drift	1.5	3500	120 pA	0.2	675	2.25	6	-40 to 85	8-SOIC	Active
ISL28134IBZ-T7	Renesas Electronics	Zero-Drift	1.5	3500	120 pA	0.2	675	2.25	6	-40 to 85	8-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MAX4091ASA+T is the recommended direct substitute. This part maintains all electrical specifications of the MAX4091ASA-T while offering active product status and availability in tape and reel packaging. Both parts are ROHS3 compliant with MSL 1 rating.

For Low-Power Applications: TLV2451AIDR and TLV2451AID provide reduced supply current (23 µA versus 130 µA) while maintaining the 2.7V to 6V supply range and -40°C to 125°C operating temperature. These parts are suitable for battery-powered or low-power designs where the reduced slew rate (0.11 V/µs) and gain bandwidth product (220 kHz) are acceptable.

For High-Speed Applications: TLC4501IDR offers superior slew rate (2.5 V/µs) and gain bandwidth product (4.7 MHz) with active product status and full temperature range support (-40°C to 125°C). This part requires minimum 4V supply and higher supply current (1 mA) compared to the MAX4091ASA-T.

For Precision Applications: ISL28134IBZ, ISL28134IBZ-T13, and ISL28134IBZ-T7 provide zero-drift architecture with exceptional input offset voltage (0.2 µV) and input bias current (120 pA). These parts are suitable for precision instrumentation where offset drift and bias current minimization are critical. All three variants are active products with ROHS3 compliance. Temperature range is limited to -40°C to 85°C.

Product Status Considerations:

MAX4091ASA+T: Active status ensures long-term availability
TLV2451AIDR: Active status with full temperature range
TLC4501IDR: Active status with enhanced performance
ISL28134IBZ variants: All active with superior precision specifications
Avoid: TLC4501ID and TLC4501CD (Last Time Buy status); TLV2451AID and TLV2451CD (obsolete or limited temperature range)

Frequently Asked Questions (FAQ)

Q: Can MAX4091ASA+T directly replace MAX4091ASA-T? A: Yes. MAX4091ASA+T is the active production equivalent with identical electrical specifications. The difference is packaging format: MAX4091ASA+T is supplied in tape and reel (TR) format, while MAX4091ASA-T uses standard tube packaging. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the primary reason to substitute the MAX4091ASA-T? A: The MAX4091ASA-T is classified as obsolete. MAX4091ASA+T provides the same functionality with active product status and guaranteed long-term availability.

Q: Are TLV2451 parts compatible with MAX4091ASA-T? A: TLV2451AIDR and TLV2451AID are compatible in terms of package (8-SOIC), supply range (2.7V to 6V), and temperature range (-40°C to 125°C). However, they have lower slew rate (0.11 V/µs versus 0.2 V/µs) and lower gain bandwidth product (220 kHz versus 500 kHz). These parts are suitable only if the application does not require the higher performance specifications of the MAX4091ASA-T.

Q: What are the trade-offs when using TLC4501IDR? A: TLC4501IDR offers superior performance (2.5 V/µs slew rate, 4.7 MHz gain bandwidth product) but requires minimum 4V supply (versus 2.7V for MAX4091ASA-T) and consumes higher supply current (1 mA versus 130 µA). Use TLC4501IDR only if the application requires higher speed and can accommodate the increased power consumption and higher minimum supply voltage.

Q: When should ISL28134IBZ be selected? A: ISL28134IBZ is selected for precision applications requiring minimal input offset voltage (0.2 µV) and input bias current (120 pA). The trade-off is higher supply current (675 µA) and reduced maximum operating temperature (85°C versus 125°C). This part is suitable for instrumentation, sensor signal conditioning, and precision measurement circuits.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the MAX4091ASA-T.

Q: What packaging options are available for substitutes? A: All substitute parts are available in 8-SOIC surface mount package. Packaging variants include tube and tape & reel (TR) formats. Verify specific packaging availability with your supplier based on production volume requirements.

Q: Can TLV2451CD be used in applications requiring -40°C to 125°C operation? A: No. TLV2451CD operates only 0°C to 70°C. For full temperature range support, use TLV2451AIDR or TLV2451AID instead.

Q: Is ISL28134IBZ suitable for -40°C to 125°C applications? A: No. ISL28134IBZ operates -40°C to 85°C. Applications requiring operation above 85°C must use alternative substitutes such as MAX4091ASA+T, TLV2451AIDR, or TLC4501IDR.

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