LT1122CS8#TRPBF Equivalent & Substitute Parts

Part Overview

The LT1122CS8#TRPBF is a J-FET input 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 2316 units in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter tolerances.

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
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LT1122CS8#TRPBF are classified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: Single circuit (1)
Package / Case: 8-SOIC form factor with 0.154" width and 3.90mm width specification
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 9 V to 10 V; Maximum 36 V
Operating Temperature Range: Minimum -40°C to 0°C; Maximum 70°C to 85°C
Slew Rate: 45 V/µs to 75 V/µs
Gain Bandwidth Product: 10 MHz to 13 MHz
Current - Input Bias: 12 pA to 30 pA
Voltage - Input Offset: 130 µV to 490 µV

Substitute Categories:

Category A - Direct J-FET Substitutes (Analog Devices 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 parts operate within the supply voltage range and are packaged in 8-SOIC format. Operating temperature ranges are 0°C to 70°C, which is narrower than the main part.

Category B - General Purpose Substitutes (Analog Devices AD847 Series): Parts AD847JRZ and AD847JRZ-REEL7 are general purpose amplifiers with enhanced slew rate (300 V/µs) and gain bandwidth product (50 MHz). These parts operate within compatible supply voltage ranges and 8-SOIC packaging but feature different amplifier topology and higher input bias current (3.3 µA).

Category C - J-FET Substitutes (Texas Instruments Excalibur™ Series): Parts TLE2071ACDR, TLE2071ID, TLE2081AID, and TLE2081IDR are J-FET amplifiers from the Excalibur™ series with slew rate of 45 V/µs and gain bandwidth product of 10 MHz. These parts operate across extended supply voltage ranges (4.5 V to 38 V) and are packaged in 8-SOIC format. Operating temperature ranges vary between 0°C to 70°C and -40°C to 85°C.

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)	Packaging
LT1122CS8#TRPBF	Analog Devices	J-FET	75	13	12	130	7.8	10	36	-40 to 85	Tape & Reel
AD744JRZ-REEL	Analog Devices	J-FET	75	13	30	300	3.5	9	36	0 to 70	Cut Tape & Digi-Reel
AD744JRZ-REEL7	Analog Devices	J-FET	75	13	30	300	3.5	9	36	0 to 70	Tape & Reel
AD744KRZ	Analog Devices	J-FET	75	13	30	250	3.5	9	36	0 to 70	Tube
AD744KRZ-REEL7	Analog Devices	J-FET	75	13	30	250	3.5	9	36	0 to 70	Tape & Reel
AD847JRZ	Analog Devices	General Purpose	300	50	3300	500	5.3	9	36	0 to 70	Tube
AD847JRZ-REEL7	Analog Devices	General Purpose	300	50	3300	500	5.3	9	36	0 to 70	Cut Tape & Digi-Reel
TLE2071ACDR	Texas Instruments	J-FET	45	10	20	470	1.7	4.5	38	0 to 70	Tape & Reel
TLE2071ID	Texas Instruments	J-FET	45	10	20	490	1.7	4.5	38	-40 to 85	Tube
TLE2081AID	Texas Instruments	J-FET	45	10	20	470	1.7	4.5	38	-40 to 85	Tube
TLE2081IDR	Texas Instruments	J-FET	45	10	20	490	1.7	4.5	38	-40 to 85	Tape & Reel

Engineering Selection Recommendations

Analog Devices AD744 Series (AD744JRZ-REEL, AD744JRZ-REEL7, AD744KRZ, AD744KRZ-REEL7):

The AD744 series maintains electrical equivalence with the LT1122CS8#TRPBF in slew rate (75 V/µs) and gain bandwidth product (13 MHz). All variants are ROHS3 compliant with MSL 1 rating. The primary consideration is the narrower operating temperature range (0°C to 70°C) compared to the main part (-40°C to 85°C). These parts are suitable for applications where the extended low-temperature performance of the LT1122CS8#TRPBF is not required. AD744KRZ and AD744KRZ-REEL7 offer improved input offset voltage (250 µV) relative to AD744JRZ variants (300 µV).

Analog Devices AD847 Series (AD847JRZ, AD847JRZ-REEL7):

The AD847 series represents a performance upgrade with significantly higher slew rate (300 V/µs) and gain bandwidth product (50 MHz). These general purpose amplifiers are ROHS3 compliant with MSL 1 rating. The trade-off is substantially higher input bias current (3.3 µA versus 12 pA) and input offset voltage (500 µV versus 130 µV). Selection of AD847 variants is appropriate for applications requiring faster transient response and higher bandwidth, where the increased input bias current does not compromise circuit performance.

Texas Instruments Excalibur™ Series (TLE2071ACDR, TLE2071ID, TLE2081AID, TLE2081IDR):

The TLE2071 and TLE2081 series are J-FET amplifiers with lower slew rate (45 V/µs) and gain bandwidth product (10 MHz) compared to the LT1122CS8#TRPBF. All variants are ROHS3 compliant with MSL 1 rating. TLE2071ID and TLE2081AID/TLE2081IDR support the extended operating temperature range (-40°C to 85°C) matching the main part. These parts feature lower supply current (1.7 mA) and operate across a wider supply voltage range (4.5 V to 38 V). Selection is appropriate for low-power applications where reduced bandwidth and slew rate are acceptable.

All substitute parts maintain 8-SOIC surface mount packaging compatibility and are available in active product status with adequate inventory levels.

Frequently Asked Questions (FAQ)

Q: Can AD744JRZ-REEL7 directly replace LT1122CS8#TRPBF in all applications?

A: AD744JRZ-REEL7 maintains identical slew rate (75 V/µs) and gain bandwidth product (13 MHz) with compatible supply voltage range (9 V to 36 V). The primary difference is the operating temperature range: AD744JRZ-REEL7 operates 0°C to 70°C while LT1122CS8#TRPBF operates -40°C to 85°C. Direct replacement is valid for applications operating within 0°C to 70°C. Applications requiring -40°C operation or below require verification of thermal performance requirements.

Q: What is the difference between AD744KRZ and AD744JRZ variants?

A: Both AD744KRZ and AD744JRZ maintain identical electrical performance in slew rate (75 V/µs), gain bandwidth product (13 MHz), and supply current (3.5 mA). The difference is input offset voltage: AD744KRZ specifies 250 µV maximum while AD744JRZ specifies 300 µV maximum. AD744KRZ provides tighter offset voltage specification. Packaging differs: AD744KRZ is supplied in Tube while AD744JRZ-REEL7 is supplied in Tape & Reel.

Q: Why does TLE2081IDR have lower supply current than LT1122CS8#TRPBF?

A: TLE2081IDR operates at 1.7 mA supply current compared to 7.8 mA for LT1122CS8#TRPBF. This lower current consumption is associated with reduced slew rate (45 V/µs versus 75 V/µs) and lower gain bandwidth product (10 MHz versus 13 MHz). The TLE2081IDR is optimized for low-power applications where bandwidth requirements are less stringent.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Tape & Reel packaging is available for AD744JRZ-REEL7, AD744KRZ-REEL7, TLE2071ACDR, and TLE2081IDR. AD744JRZ-REEL is supplied in Cut Tape & Digi-Reel format. AD744KRZ, AD847JRZ, TLE2071ID, and TLE2081AID are supplied in Tube packaging. Packaging selection depends on assembly process requirements and volume considerations.

Q: What is the significance of the operating temperature range difference?

A: LT1122CS8#TRPBF operates -40°C to 85°C, providing extended low-temperature performance. Most AD744 variants (AD744JRZ-REEL, AD744JRZ-REEL7, AD744KRZ, AD744KRZ-REEL7) operate 0°C to 70°C. TLE2071ID, TLE2081AID, and TLE2081IDR operate -40°C to 85°C, matching the main part. Applications requiring operation below 0°C must use parts with -40°C minimum rating.

Q: Can AD847JRZ be used as a substitute if higher bandwidth is required?

A: AD847JRZ provides significantly higher slew rate (300 V/µs versus 75 V/µs) and gain bandwidth product (50 MHz versus 13 MHz). However, input bias current increases to 3.3 µA (versus 12 pA) and input offset voltage increases to 500 µV (versus 130 µV). Substitution is valid only if the application circuit design accommodates these higher input bias and offset specifications. Operating temperature range is 0°C to 70°C.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited) rating. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001. REACH status is Unaffected for all parts. These certifications ensure regulatory compliance for industrial and commercial applications.

Q: Is the 8-SOIC package identical across all parts?

A: All parts use 8-SOIC (0.154", 3.90mm Width) packaging, ensuring mechanical compatibility for PCB layout and assembly. Pin configuration and footprint are identical across all listed substitutes, allowing direct board-level replacement without layout modification.

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