AD820ARMZ-RL Equivalent & Substitute Parts

Part Overview

The AD820ARMZ-RL is a J-FET input operational amplifier manufactured by Analog Devices Inc., designed for applications requiring low input bias current and rail-to-rail output capability. This single-circuit device operates across a 5V to 36V supply range and is housed in an 8-MSOP surface mount package. The part is active and in production, with 931 units currently in stock.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified operating parameters while maintaining compatibility with the 8-MSOP package footprint and surface mount assembly requirements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	3	V/µs
Gain Bandwidth Product	1.9	MHz
Current - Input Bias	2	pA
Voltage - Input Offset	400	µV
Current - Supply	700	µA
Current - Output / Channel	20	mA
Voltage - Supply Span (Min)	5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the AD820ARMZ-RL are identified based on the following critical parameters:

Primary Compatibility Criteria:

Single circuit operational amplifier configuration
Rail-to-rail output capability
8-MSOP surface mount package footprint
Supply voltage range compatibility (minimum 5V, maximum 36V)
Operating temperature range overlap (-40°C minimum)
RoHS3 compliance and MSL rating

Substitution Categories:

Category 1: J-FET Amplifiers (Direct Type Match) Parts OPA140AIDGKR, OPA140AIDGKT, OPA141AIDGKR, OPA141AIDGKT, and OPA1641AIDGKR/AIDGKT maintain J-FET input architecture. These devices provide enhanced performance in slew rate, gain bandwidth product, and output current while preserving the low input bias current characteristic essential to J-FET topology.

Category 2: General Purpose Amplifiers (Functional Equivalents) Parts MAX9943AUA+, MAX9943AUA+T, MAX9945AUA+, and MAX9945AUA+T employ general purpose amplifier architecture with rail-to-rail output. These devices operate within the supply voltage envelope and provide alternative performance trade-offs suitable for applications where J-FET input characteristics are not mandatory.

All substitute parts maintain active product status, RoHS3 compliance, and surface mount assembly compatibility.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
AD820ARMZ-RL	Analog Devices	J-FET	3	1.9	2	400	700	20	5	36	-40 to 85	8-MSOP
OPA140AIDGKR	Texas Instruments	J-FET	20	11	0.5	30	1800	36	4.5	36	-40 to 125	8-VSSOP
OPA140AIDGKT	Texas Instruments	J-FET	20	11	0.5	30	1800	36	4.5	36	-40 to 125	8-VSSOP
OPA141AIDGKR	Texas Instruments	J-FET	20	10	2	1000	1800	36	4.5	36	-40 to 125	8-VSSOP
OPA141AIDGKT	Texas Instruments	J-FET	20	10	2	1000	1800	36	4.5	36	-40 to 125	8-VSSOP
OPA1641AIDGKR	Texas Instruments	Audio	20	11	2	1000	1800	36	4.5	36	-40 to 85	8-VSSOP
OPA1641AIDGKT	Texas Instruments	Audio	20	11	2	1000	1800	36	4.5	36	-40 to 85	8-VSSOP
MAX9943AUA+	Analog Devices/Maxim	General Purpose	0.35	2.4	4000	20	550	20	6	38	-40 to 125	8-uMAX/uSOP
MAX9943AUA+T	Analog Devices/Maxim	General Purpose	0.35	2.4	4000	20	550	20	6	38	-40 to 125	8-uMAX/uSOP
MAX9945AUA+	Analog Devices/Maxim	General Purpose	2.2	3	0.05	600	400	25	4.75	38	-40 to 125	8-uMAX/uSOP
MAX9945AUA+T	Analog Devices/Maxim	General Purpose	2.2	3	0.05	600	400	25	4.75	38	-40 to 125	8-uMAX/uSOP

Engineering Selection Recommendations

J-FET Substitutes (OPA140 and OPA141 Series):

The OPA140AIDGKR and OPA140AIDGKT devices provide enhanced performance specifications while maintaining J-FET input architecture. These parts support the extended operating temperature range of -40°C to 125°C and deliver superior slew rate (20V/µs versus 3V/µs) and gain bandwidth product (11MHz versus 1.9MHz). Input bias current is reduced to 0.5pA, and input offset voltage is improved to 30µV. Supply current increases to 1.8mA, and output current capability extends to 36mA. Minimum supply voltage requirement is 4.5V, which is compatible with the AD820ARMZ-RL's 5V minimum specification.

The OPA141AIDGKR and OPA141AIDGKT devices maintain identical performance characteristics to the OPA140 series with input bias current matching the AD820ARMZ-RL at 2pA. Input offset voltage is specified at 1mV. These parts are suitable for applications where input bias current specification is critical.

The OPA1641AIDGKR and OPA1641AIDGKT devices are audio-optimized variants with identical electrical performance to the OPA141 series. Operating temperature range is -40°C to 85°C, matching the AD820ARMZ-RL specification. These parts carry the SoundPlus™ series designation.

All Texas Instruments J-FET substitutes employ 8-VSSOP packaging, which maintains the same 0.118" width and 3.00mm footprint as the 8-MSOP package. MSL rating is 2 (1 Year), compared to MSL 1 (Unlimited) for the AD820ARMZ-RL.

General Purpose Substitutes (MAX9943 and MAX9945 Series):

The MAX9943AUA+ and MAX9943AUA+T devices provide general purpose amplifier functionality with rail-to-rail output. Slew rate is reduced to 0.35V/µs, and gain bandwidth product is 2.4MHz. Input bias current is specified at 4nA, and input offset voltage is improved to 20µV. Supply current is reduced to 550µA. Minimum supply voltage is 6V, which exceeds the AD820ARMZ-RL's 5V minimum. Maximum supply voltage extends to 38V. Operating temperature range is -40°C to 125°C.

The MAX9945AUA+ and MAX9945AUA+T devices deliver improved slew rate (2.2V/µs) and gain bandwidth product (3MHz) compared to the MAX9943 series. Input bias current is specified at 0.05pA, and input offset voltage is 600µV. Supply current is reduced to 400µA, and output current capability is increased to 25mA. Minimum supply voltage is 4.75V, which is compatible with the AD820ARMZ-RL's 5V minimum specification. Operating temperature range is -40°C to 125°C.

All Maxim Integrated general purpose substitutes employ 8-uMAX/uSOP packaging with 0.118" width and 3.00mm footprint compatibility. MSL rating is 1 (Unlimited), matching the AD820ARMZ-RL specification.

Compliance and Regulatory Status:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, consistent with the AD820ARMZ-RL. All parts are active in production with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the OPA140AIDGKR be used as a direct replacement for the AD820ARMZ-RL in existing PCB designs?

A: The OPA140AIDGKR maintains electrical compatibility within the specified supply voltage range (4.5V to 36V) and operating temperature range (-40°C to 125°C). Both devices employ 8-pin surface mount packages with identical 0.118" width and 3.00mm footprint. However, the OPA140AIDGKR uses 8-VSSOP packaging while the AD820ARMZ-RL uses 8-MSOP packaging. Pin-to-pin compatibility must be verified against the specific device datasheets before PCB layout implementation. The OPA140AIDGKR delivers superior performance in slew rate, gain bandwidth product, and output current capability.

Q: What is the primary difference between J-FET and general purpose amplifier substitutes?

A: J-FET input amplifiers (OPA140, OPA141, OPA1641 series) maintain the low input bias current characteristic of the AD820ARMZ-RL, specified at 0.5pA to 2pA. General purpose amplifiers (MAX9943, MAX9945 series) employ different input stage architecture, resulting in higher input bias current (0.05pA to 4nA) and different offset voltage specifications. J-FET substitutes are appropriate for applications requiring extremely low input bias current. General purpose substitutes are suitable for applications where input bias current is less critical and lower supply current consumption is beneficial.

Q: Are the MAX9943 and MAX9945 devices suitable for the same applications as the AD820ARMZ-RL?

A: The MAX9943 and MAX9945 devices provide rail-to-rail output capability and operate within overlapping supply voltage ranges. However, the MAX9943 series specifies a minimum supply voltage of 6V, which exceeds the AD820ARMZ-RL's 5V minimum. The MAX9945 series minimum supply voltage is 4.75V, compatible with 5V operation. Both general purpose series deliver reduced slew rate compared to the AD820ARMZ-RL and J-FET alternatives. Application suitability depends on specific slew rate, input bias current, and supply voltage requirements.

Q: What packaging considerations apply when substituting the AD820ARMZ-RL?

A: The AD820ARMZ-RL is supplied in 8-MSOP packaging with Tape & Reel (TR) format. Texas Instruments J-FET substitutes (OPA140, OPA141, OPA1641 series) employ 8-VSSOP packaging. Maxim Integrated general purpose substitutes (MAX9943, MAX9945 series) employ 8-uMAX/uSOP packaging. All packages maintain identical 0.118" width and 3.00mm footprint dimensions, ensuring PCB land pattern compatibility. Packaging format availability varies: OPA140AIDGKR and OPA141AIDGKR are supplied in Cut Tape (CT) & Digi-Reel® format, while OPA140AIDGKT, OPA141AIDGKT, OPA1641AIDGKT, and MAX9945AUA+T are supplied in Tape & Reel (TR) format. MAX9943AUA+ is supplied in Tube format, and MAX9945AUA+ is supplied in Tube format.

Q: How do the operating temperature ranges compare across substitute options?

A: The AD820ARMZ-RL operates across -40°C to 85°C. Texas Instruments J-FET substitutes (OPA140, OPA141 series) extend the upper temperature limit to 125°C. The OPA1641 audio variant matches the AD820ARMZ-RL specification at -40°C to 85°C. Maxim Integrated general purpose substitutes (MAX9943, MAX9945 series) extend the upper temperature limit to 125°C. Extended temperature range capability may be beneficial for industrial and automotive applications operating at elevated ambient temperatures.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings in substitute selection?

A: The AD820ARMZ-RL carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling. Texas Instruments J-FET substitutes (OPA140, OPA141, OPA1641 series) carry MSL 2 (1 Year), requiring controlled storage conditions and limiting shelf life to one year from the date of manufacture. Maxim Integrated general purpose substitutes (MAX9943, MAX9945 series) carry MSL 1 (Unlimited), matching the AD820ARMZ-RL specification. MSL 2 rated devices require compliance with IPC/JEDEC moisture sensitivity guidelines during assembly and rework operations.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed maintain ROHS3 compliance, consistent with the AD820ARMZ-RL. REACH Unaffected status and EAR99 ECCN classification are uniform across all devices. Regulatory compliance documentation is available from respective manufacturers.

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