LT1225CS8#TRPBF Equivalent & Substitute Parts

Part Overview

The LT1225CS8#TRPBF is a general purpose operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This device features a single amplifier circuit with a 150 MHz gain bandwidth product and 400V/µs slew rate, designed for general purpose signal conditioning and amplification applications across a 5V to 30V supply range.

The LT1225CS8#TRPBF is classified as Last Time Buy, indicating that the original manufacturer has discontinued or will discontinue production. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Gain Bandwidth Product	150	MHz
Slew Rate	400	V/µs
Current - Input Bias	4	µA
Voltage - Input Offset	500	µV
Current - Supply	7	mA
Voltage - Supply Span (Min)	5	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LT1225CS8#TRPBF is determined by alignment across the following critical parameters: amplifier type classification, number of circuits, package form factor, mounting technology, supply voltage range compatibility, and operating temperature range. The substitute parts are grouped into two categories based on functional equivalence and package compatibility.

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) or compatible surface mount packages
Number of Circuits: 1
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 5V, Maximum ≥30V
Operating Temperature: 0°C to 70°C or extended range
RoHS3 Compliance

Group 1: General Purpose Amplifiers (8-SOIC Package) Parts maintaining the same package footprint and general purpose amplifier classification: AD848JRZ, THS4061CD, THS4061CDR

Group 2: Voltage Feedback Amplifiers (8-SOIC Package) Parts with voltage feedback topology in 8-SOIC package: AD818ARZ, AD818ARZ-REEL, AD818ARZ-REEL7

Group 3: Alternative Package Topologies Parts with different package configurations but compatible electrical specifications: AD8067ARTZ-REEL7 (SOT-23-5)

Parameter Comparison

Parameter	LT1225CS8#TRPBF	AD848JRZ	AD818ARZ-REEL7	THS4061CDR	AD8067ARTZ-REEL7
Amplifier Type	General Purpose	General Purpose	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	1	1	1	1	1
Slew Rate (V/µs)	400	300	500	400	640
Gain Bandwidth Product (MHz)	150	175	130	180	54
Current - Input Bias (µA)	4	3.3	—	3	0.0000006
Voltage - Input Offset (µV)	500	200	—	2500	200
Current - Supply (mA)	7	5.1	7	7.8	6.6
Voltage - Supply Span Min (V)	5	9	5	9	5
Voltage - Supply Span Max (V)	30	36	36	33	24
Operating Temperature (°C)	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	SOT-23-5
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Package Equivalents (8-SOIC):

The AD848JRZ represents the closest functional equivalent to the LT1225CS8#TRPBF. Both are general purpose amplifiers in 8-SOIC packages with identical operating temperature ranges (0°C to 70°C). The AD848JRZ maintains superior gain bandwidth product (175 MHz versus 150 MHz) and lower input bias current (3.3 µA versus 4 µA), while operating within the same supply voltage envelope. The AD848JRZ is currently in Active product status, ensuring long-term availability and supply chain continuity.

The THS4061CDR and THS4061CD (Texas Instruments) provide voltage feedback amplifier topology in 8-SOIC packages with 180 MHz bandwidth and 400V/µs slew rate, matching the original device's performance envelope. Both variants are Active products with identical electrical specifications and RoHS3 compliance.

The AD818ARZ-REEL7 and AD818ARZ-REEL variants offer voltage feedback amplifier architecture in 8-SOIC packages with 130 MHz bandwidth and 500V/µs slew rate. These devices support extended supply voltage ranges (5V to 36V) and maintain Active product status.

Alternative Package Configuration:

The AD8067ARTZ-REEL7 provides a voltage feedback amplifier in SOT-23-5 package with superior slew rate (640V/µs) and extended operating temperature range (-40°C to 85°C). This device requires PCB layout modification due to different package footprint but offers enhanced performance characteristics and broader temperature operation. The AD8067ARTZ-REEL7 is currently in Active status with RoHS3 compliance.

Compliance and Availability:

All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the environmental and regulatory requirements of the original LT1225CS8#TRPBF. All substitute parts are classified as Active products, ensuring continued manufacturing support and supply availability.

Frequently Asked Questions (FAQ)

Q: Can the AD848JRZ directly replace the LT1225CS8#TRPBF without PCB modifications?

A: Yes. The AD848JRZ shares identical 8-SOIC package dimensions (0.154", 3.90mm width) and pinout compatibility with the LT1225CS8#TRPBF. No PCB layout changes are required for direct substitution.

Q: What is the primary difference between the AD818ARZ-REEL7 and the LT1225CS8#TRPBF?

A: The AD818ARZ-REEL7 implements voltage feedback amplifier topology, whereas the LT1225CS8#TRPBF is a general purpose amplifier. Both devices operate in 8-SOIC packages with compatible supply voltage ranges. The AD818ARZ-REEL7 offers higher slew rate (500V/µs versus 400V/µs) and lower gain bandwidth product (130 MHz versus 150 MHz).

Q: Does the AD8067ARTZ-REEL7 require PCB redesign?

A: Yes. The AD8067ARTZ-REEL7 uses SOT-23-5 package, which differs from the 8-SOIC package of the LT1225CS8#TRPBF. PCB layout modifications are necessary to accommodate the different pin configuration and package footprint.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts—AD848JRZ, AD818ARZ-REEL7, THS4061CDR, and AD8067ARTZ-REEL7—are ROHS3 compliant and REACH Unaffected, matching the environmental compliance profile of the original LT1225CS8#TRPBF.

Q: Which substitute part offers the widest operating temperature range?

A: The AD8067ARTZ-REEL7 operates across -40°C to 85°C, providing extended temperature coverage compared to the LT1225CS8#TRPBF operating range of 0°C to 70°C. All other substitute parts maintain the 0°C to 70°C operating range.

Q: What is the supply voltage compatibility range for the AD818ARZ-REEL7?

A: The AD818ARZ-REEL7 supports single supply operation from 5V to 36V and dual supply operation from ±2.5V to ±18V, exceeding the LT1225CS8#TRPBF maximum supply voltage of 30V.

Q: Are the THS4061CD and THS4061CDR electrically identical?

A: Yes. The THS4061CD and THS4061CDR are electrically identical voltage feedback amplifiers in 8-SOIC packages. The primary difference is packaging format: THS4061CD is supplied in Tube packaging, while THS4061CDR is supplied in Tape & Reel format.

Q: Which substitute part has the lowest input bias current?

A: The AD8067ARTZ-REEL7 exhibits the lowest input bias current at 0.6 pA, compared to 4 µA for the LT1225CS8#TRPBF. This characteristic is beneficial for high-impedance signal conditioning applications.

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