LT1122CS8#TR Equivalent & Substitute Parts

Part Overview

The LT1122CS8#TR is a J-FET operational amplifier manufactured by Analog Devices Inc., designed for single-circuit applications in 8-SOIC surface mount packaging. This device operates across a supply voltage range of 10 V to 36 V with an operating temperature range of -40°C to 85°C. The part is currently in Active product status with 2,772 units in stock.

Equivalent and substitute parts are identified based on matching functional characteristics, package compatibility, and electrical performance parameters. Alternative components may be required due to supply availability, specific application requirements, or design optimization needs.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	75	V/µs
Gain Bandwidth Product	13	MHz
Current - Input Bias	12	pA
Voltage - Input Offset	130	µV
Current - Supply	7.8	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°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 LT1122CS8#TR are identified based on the following critical parameters:

Primary Matching Criteria:

Amplifier Type: J-FET or General Purpose
Number of Circuits: 1
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Slew Rate: 75 V/µs or greater
Gain Bandwidth Product: 13 MHz or greater
Voltage - Supply Span: Minimum 10 V to Maximum 36 V overlap

Substitution Categories:

Category 1: Direct J-FET Equivalents (AD744 Series) Parts AD744JRZ-REEL, AD744JRZ-REEL7, AD744KRZ, and AD744KRZ-REEL7 maintain J-FET amplifier topology with identical slew rate (75 V/µs) and gain bandwidth product (13 MHz). These devices feature lower input bias current (30 pA vs. 12 pA) and reduced supply current (3.5 mA vs. 7.8 mA). Operating temperature range is 0°C to 70°C, which is narrower than the main part. Minimum supply voltage is 9 V, which is below the main part specification of 10 V.

Category 2: General Purpose Alternative (AD847 Series) Parts AD847JRZ and AD847JRZ-REEL7 are general purpose amplifiers with higher performance specifications: slew rate of 300 V/µs and gain bandwidth product of 50 MHz. These represent performance upgrades suitable for applications requiring faster response characteristics. Operating temperature range is 0°C to 70°C.

Category 3: Low-Power J-FET Alternatives (TLE2071/TLE2081 Series) Parts TLE2071ACDR, TLE2071ID, TLE2081AID, and TLE2081IDR are Texas Instruments J-FET amplifiers with lower slew rate (45 V/µs) and lower gain bandwidth product (10 MHz). These devices feature significantly reduced supply current (1.7 mA) and extended operating temperature range (-40°C to 85°C for TLE2071ID and TLE2081AID/IDR). Minimum supply voltage is 4.5 V, providing greater flexibility in low-voltage applications.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	Gain Bandwidth (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Product Status
LT1122CS8#TR	Analog Devices	J-FET	75	13	12	130	7.8	10	36	-40 to 85	8-SOIC	Active
AD744JRZ-REEL	Analog Devices	J-FET	75	13	30	300	3.5	9	36	0 to 70	8-SOIC	Active
AD744JRZ-REEL7	Analog Devices	J-FET	75	13	30	300	3.5	9	36	0 to 70	8-SOIC	Active
AD744KRZ	Analog Devices	J-FET	75	13	30	250	3.5	9	36	0 to 70	8-SOIC	Active
AD744KRZ-REEL7	Analog Devices	J-FET	75	13	30	250	3.5	9	36	0 to 70	8-SOIC	Active
AD847JRZ	Analog Devices	General Purpose	300	50	3300	500	5.3	9	36	0 to 70	8-SOIC	Active
AD847JRZ-REEL7	Analog Devices	General Purpose	300	50	3300	500	5.3	9	36	0 to 70	8-SOIC	Active
TLE2071ACDR	Texas Instruments	J-FET	45	10	20	470	1.7	4.5	38	0 to 70	8-SOIC	Active
TLE2071ID	Texas Instruments	J-FET	45	10	20	490	1.7	4.5	38	-40 to 85	8-SOIC	Last Time Buy
TLE2081AID	Texas Instruments	J-FET	45	10	20	470	1.7	4.5	38	-40 to 85	8-SOIC	Active
TLE2081IDR	Texas Instruments	J-FET	45	10	20	490	1.7	4.5	38	-40 to 85	8-SOIC	Active

Engineering Selection Recommendations

For Direct Functional Replacement:

The AD744 series (AD744JRZ-REEL, AD744JRZ-REEL7, AD744KRZ, AD744KRZ-REEL7) provides the closest electrical match to the LT1122CS8#TR with identical slew rate and gain bandwidth product. All AD744 variants are Active status products from Analog Devices Inc. with ROHS3 compliance and MSL 1 rating. Selection between AD744JRZ and AD744KRZ variants depends on input offset voltage tolerance requirements (300 µV vs. 250 µV). The primary limitation is the narrower operating temperature range (0°C to 70°C) compared to the main part (-40°C to 85°C).

For Extended Temperature Range Applications:

The TLE2081AID and TLE2081IDR from Texas Instruments maintain the -40°C to 85°C operating temperature range matching the LT1122CS8#TR. Both devices are Active status products with ROHS3 compliance and MSL 1 rating. These parts feature lower slew rate (45 V/µs) and lower gain bandwidth product (10 MHz), representing performance trade-offs for reduced power consumption (1.7 mA vs. 7.8 mA) and extended supply voltage flexibility (4.5 V minimum).

For Performance Enhancement:

The AD847JRZ and AD847JRZ-REEL7 general purpose amplifiers provide higher slew rate (300 V/µs) and gain bandwidth product (50 MHz) for applications requiring faster transient response. Both are Active status products with ROHS3 compliance. The trade-off includes higher input bias current (3.3 µA) and narrower operating temperature range (0°C to 70°C).

Compliance and Certification:

All substitute parts listed maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and REACH Unaffected status, matching the regulatory profile of the main part. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can AD744 series parts directly replace the LT1122CS8#TR in all applications?

A: AD744 series parts match the electrical performance specifications (slew rate and gain bandwidth product) and package format. However, the operating temperature range is limited to 0°C to 70°C compared to the main part's -40°C to 85°C range. Applications requiring extended temperature operation must use TLE2081 or TLE2071 alternatives.

Q: What is the difference between AD744JRZ-REEL and AD744JRZ-REEL7?

A: Both parts are electrically identical with identical specifications. The difference is in packaging format: AD744JRZ-REEL is supplied in Cut Tape (CT) & Digi-Reel® format, while AD744JRZ-REEL7 is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Why do TLE2081 parts have lower slew rate and gain bandwidth product?

A: The TLE2081 series is designed for low-power applications with supply current of 1.7 mA compared to 7.8 mA for the LT1122CS8#TR. The reduced performance specifications reflect the design optimization for power efficiency. These parts are suitable for battery-powered or low-power circuit applications.

Q: Are the AD847 parts suitable as drop-in replacements?

A: AD847 parts are not direct replacements due to different amplifier topology (General Purpose vs. J-FET). While they share the same 8-SOIC package and supply voltage range, the significantly higher input bias current (3.3 µA vs. 12 pA) and different frequency response characteristics require circuit re-evaluation. Use AD847 parts only when higher performance specifications are required.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel®. All variants maintain the same 8-SOIC (0.154", 3.90mm Width) physical package. Selection depends on assembly process requirements and volume procurement strategies.

Q: Can TLE2071ID be used despite its Last Time Buy status?

A: TLE2071ID is designated as Last Time Buy, indicating limited future availability. While currently in stock (1,220 units), this part should not be selected for new designs requiring long-term supply assurance. Use TLE2081AID or TLE2081IDR as alternatives for extended temperature range applications with confirmed Active status.

Q: What are the key differences in input offset voltage across substitute options?

A: Input offset voltage varies across substitutes: LT1122CS8#TR (130 µV), AD744JRZ variants (300 µV), AD744KRZ variants (250 µV), AD847 variants (500 µV), and TLE2071/TLE2081 variants (470-490 µV). Applications with tight offset voltage requirements should prioritize AD744KRZ variants or maintain the original LT1122CS8#TR.

Q: Is supply current reduction important for my application?

A: Supply current ranges from 1.7 mA (TLE2081/TLE2071) to 7.8 mA (LT1122CS8#TR). For battery-powered or power-constrained applications, TLE2081 or TLE2071 series provides significant power savings. For applications with adequate power supply capacity, higher supply current is not a limiting factor.

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