AD8620AR Equivalent & Substitute Parts

Part Overview

The AD8620AR is a J-FET input operational amplifier manufactured by Analog Devices Inc., configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This component is classified as obsolete, indicating it is no longer in active production. The AD8620AR delivers high-speed performance with a 60V/µs slew rate and 25 MHz gain bandwidth product, making it suitable for precision signal conditioning and low-noise amplification applications requiring J-FET input characteristics.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, system maintenance, and procurement of replacement inventory. Substitute parts must maintain functional compatibility across critical electrical parameters including slew rate, gain bandwidth product, input bias current, and supply voltage specifications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	2	—
Slew Rate	60	V/µs
Gain Bandwidth Product	25	MHz
Current - Input Bias	3	pA
Voltage - Input Offset	85	µV
Current - Supply	3	mA (x2 Channels)
Current - Output / Channel	45	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	26	V
Operating Temperature	-40 to 125	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AD8620AR is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Amplifier Type (J-FET input architecture)
Number of Circuits (dual-channel configuration)
Package / Case (8-SOIC form factor)
Slew Rate (minimum 60V/µs for direct replacement)
Gain Bandwidth Product (minimum 25 MHz)
Input Bias Current (maximum 3 pA for J-FET types)
Supply Voltage Range (minimum 10V to 26V span)
Operating Temperature Range (minimum -40°C to 125°C)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts that maintain identical or superior electrical specifications across all critical parameters, with the same J-FET amplifier type and matching or exceeding performance metrics.

Functional Alternatives: Parts that share the same package, circuit count, and mounting type but may differ in amplifier type (general purpose vs. J-FET) or specific performance characteristics. These alternatives are suitable when the application does not require the exact J-FET input characteristics of the original part.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
AD8620AR	Analog Devices	J-FET	60	25	3	85	10	26	-40 to 125	Obsolete
AD8620ARZ	Analog Devices	J-FET	60	25	3	85	10	26	-40 to 125	Active
TLE2082AID	Texas Instruments	J-FET	40	10	20	700	4.5	38	-40 to 85	Last Time Buy
TLE2082AIDR	Texas Instruments	J-FET	40	10	20	700	4.5	38	-40 to 85	Active
TLE2082ACD	Texas Instruments	J-FET	40	10	20	700	4.5	38	0 to 70	Last Time Buy
TLE2082ACDR	Texas Instruments	J-FET	40	10	20	700	4.5	38	0 to 70	Active
TL072CDT	STMicroelectronics	J-FET	16	4	20	3000	6	36	0 to 70	Active
OPA2107AU	Texas Instruments	General Purpose	18	4.5	4	100	9	36	-25 to 85	Not For New Designs
OPA2107AU/2K5	Texas Instruments	General Purpose	18	4.5	4	100	9	36	-25 to 85	Active
LT1213CS8	Analog Devices	General Purpose	12	28	90	150	2.5	36	-40 to 85	Active
LT1213CS8#TR	Analog Devices	General Purpose	12	28	90	150	2.5	36	-40 to 85	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

The AD8620ARZ is the primary direct equivalent for the obsolete AD8620AR. Both parts are manufactured by Analog Devices Inc. and share identical electrical specifications across all critical parameters: 60V/µs slew rate, 25 MHz gain bandwidth product, 3 pA input bias current, and -40°C to 125°C operating temperature range. The AD8620ARZ is currently in active production status, ensuring long-term availability. The only difference is packaging format (Tube vs. unspecified for the original), which does not affect electrical performance. This part is suitable for direct pin-for-pin replacement in all applications.

J-FET Alternatives with Reduced Performance:

The TLE2082 series (TLE2082AID, TLE2082AIDR, TLE2082ACD, TLE2082ACDR) from Texas Instruments maintains J-FET input architecture but with reduced slew rate (40V/µs vs. 60V/µs) and lower gain bandwidth product (10 MHz vs. 25 MHz). These parts are suitable for applications where the lower performance metrics are acceptable. The TLE2082AIDR variant is recommended over TLE2082AID due to active product status. The TLE2082ACDR is recommended over TLE2082ACD for the same reason. Operating temperature range is limited to -40°C to 85°C or 0°C to 70°C depending on variant, which may not meet extended temperature requirements of the original part.

The TL072CDT from STMicroelectronics is a J-FET amplifier with significantly reduced performance (16V/µs slew rate, 4 MHz gain bandwidth product) and is suitable only for applications with relaxed speed requirements. This part includes AEC-Q100 automotive qualification and is available in high volume.

General Purpose Alternatives (Different Architecture):

The LT1213CS8 and LT1213CS8#TR from Analog Devices are general purpose amplifiers with higher gain bandwidth product (28 MHz) but lower slew rate (12V/µs) and significantly higher input bias current (90 nA vs. 3 pA). These parts are not suitable for applications requiring the low input bias current characteristic of J-FET input stages. Both variants are in active production.

The OPA2107AU/2K5 from Texas Instruments is a general purpose amplifier in active production status. The OPA2107AU variant is marked "Not For New Designs" and should be avoided for new applications. Both OPA2107 variants have reduced operating temperature range (-25°C to 85°C) compared to the original part.

Compliance and Certification:

All substitute parts listed are RoHS3 compliant and REACH unaffected. Moisture sensitivity level is 1 (Unlimited) for all J-FET variants and the LT1213 series, indicating no special moisture handling requirements. The OPA2107 series has MSL 3 (168 Hours), requiring controlled moisture exposure during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can the AD8620ARZ be used as a direct replacement for the AD8620AR?

A: Yes. The AD8620ARZ is electrically identical to the AD8620AR across all specified parameters and is the recommended direct replacement. Both parts are dual-channel J-FET amplifiers with 60V/µs slew rate, 25 MHz gain bandwidth product, and -40°C to 125°C operating temperature range. The AD8620ARZ is currently in active production, ensuring availability.

Q: What is the key difference between J-FET and general purpose amplifier types?

A: J-FET input amplifiers feature extremely low input bias current (typically in the picoampere range), making them suitable for high-impedance signal sources and precision measurement applications. General purpose amplifiers typically have higher input bias current (nanoampere range) but may offer other performance advantages such as higher gain bandwidth product or lower supply voltage requirements. The AD8620AR's 3 pA input bias current is a defining characteristic of its J-FET architecture.

Q: Why do the TLE2082 variants have lower slew rate and gain bandwidth product than the AD8620AR?

A: The TLE2082 series represents a different design generation with different performance trade-offs. While the TLE2082 maintains J-FET input architecture, it prioritizes lower power consumption (3.1 mA vs. 3 mA supply current) and wider supply voltage range (4.5V to 38V vs. 10V to 26V) at the expense of reduced speed performance. These parts are suitable for applications where speed is not critical but extended supply voltage range is beneficial.

Q: Can I use the LT1213CS8 in place of the AD8620AR?

A: The LT1213CS8 is not recommended as a direct replacement. While both are dual-channel amplifiers in 8-SOIC packages, the LT1213 is a general purpose amplifier with 90 nA input bias current compared to the AD8620AR's 3 pA. This 30,000-fold difference in input bias current makes the LT1213 unsuitable for applications requiring the low-bias-current characteristics of the original part. The LT1213 is suitable only for applications where input bias current is not a critical specification.

Q: What is the operating temperature limitation of the TLE2082 variants?

A: The TLE2082AID and TLE2082AIDR variants operate from -40°C to 85°C, which is 40°C below the upper limit of the AD8620AR (-40°C to 125°C). The TLE2082ACD and TLE2082ACDR variants operate from 0°C to 70°C, further restricting the lower temperature limit. Applications requiring operation above 85°C cannot use the TLE2082 series as a replacement.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

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

A: "Last Time Buy" status indicates that the manufacturer has announced end-of-life for the product and will accept orders only until a specified cutoff date. Parts with this status (TLE2082AID and TLE2082ACD) should be avoided for new designs or long-term production requirements. The active variants (TLE2082AIDR and TLE2082ACDR) are preferred for ongoing applications.

Q: Can the OPA2107AU be used for new designs?

A: The OPA2107AU is marked "Not For New Designs" and should not be selected for new applications. The OPA2107AU/2K5 variant is in active production status and is the appropriate choice if the OPA2107 architecture is required. However, the OPA2107 series has reduced operating temperature range (-25°C to 85°C) and higher input bias current (4 pA) compared to the AD8620AR, limiting its suitability as a replacement.

Q: What packaging formats are available for the AD8620ARZ?

A: The AD8620ARZ is available in Tube packaging. The base product AD8620 is available in multiple packaging options to support different manufacturing and procurement workflows.

Q: Is the TL072CDT suitable for audio applications?

A: The TL072CDT is a J-FET amplifier commonly used in audio applications. However, its significantly reduced slew rate (16V/µs vs. 60V/µs) and gain bandwidth product (4 MHz vs. 25 MHz) compared to the AD8620AR make it unsuitable as a direct replacement for high-speed signal processing. The TL072 is appropriate for audio and low-frequency applications where its performance characteristics are adequate.

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