LT1225CS8#PBF Equivalent & Substitute Parts

Part Overview

The LT1225CS8#PBF is a general purpose operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This device is classified as a Last Time Buy product, indicating discontinued production with limited remaining inventory. The LT1225CS8#PBF operates across a 5V to 30V supply span and delivers 400V/µs slew rate with 150 MHz gain bandwidth product, making it suitable for general purpose amplification applications requiring moderate bandwidth and slew rate performance.

Identification of equivalent and substitute parts is necessary due to the Last Time Buy status of the LT1225CS8#PBF. Active production alternatives with comparable electrical characteristics and compatible packaging enable continued system design and procurement without redesign constraints.

Key Parameters

Parameter	LT1225CS8#PBF
Amplifier Type	General Purpose
Number of Circuits	1
Slew Rate	400V/µs
Gain Bandwidth Product	150 MHz
Current - Input Bias	4 µA
Voltage - Input Offset	500 µV
Current - Supply	7 mA
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	5 V
Voltage - Supply Span (Max)	30 V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LT1225CS8#PBF are selected based on electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

Package compatibility: 8-SOIC (0.154", 3.90mm Width) form factor
Single circuit configuration
Surface mount technology
Supply voltage range overlap: minimum 5V capability
Slew rate: 300V/µs or greater
Gain bandwidth product or -3dB bandwidth: 130 MHz or greater
Input bias current: 4 µA or lower
Input offset voltage: 500 µV or lower
Output current capability: 32 mA or greater
Operating temperature range: 0°C minimum
RoHS3 compliance
MSL rating of 1 or 2

Substitute Categories:

Category 1: General Purpose Amplifiers (Direct Functional Equivalents) Parts maintaining general purpose amplifier classification with comparable bandwidth and slew rate performance in identical or compatible packaging.

Category 2: Voltage Feedback Amplifiers (Enhanced Performance Alternatives) Parts with voltage feedback topology offering higher bandwidth or slew rate performance, suitable for applications requiring improved frequency response while maintaining 8-SOIC package compatibility.

Category 3: Differential Amplifiers (Specialized Alternatives) Parts with differential amplifier topology in 8-SOIC packaging, applicable to systems requiring differential input configurations.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	Bandwidth / GBW (MHz)	Input Bias (µA)	Input Offset (µV)	Supply Current (mA)	Output Current (mA)	Supply Span Min (V)	Supply Span Max (V)	Temp Range (°C)	Package	Product Status
LT1225CS8#PBF	Analog Devices	General Purpose	400	150 GBW	4	500	7	40	5	30	0 ~ 70	8-SOIC	Last Time Buy
AD848JRZ	Analog Devices	General Purpose	300	175 GBW	3.3	200	5.1	32	9	36	0 ~ 70	8-SOIC	Active
AD8067ARTZ-REEL7	Analog Devices	Voltage Feedback	640	54 -3dB	0.0006	200	6.6	26	5	24	-40 ~ 85	SOT-23-5	Active
AD818ARZ	Analog Devices	Voltage Feedback	500	130 -3dB	—	—	7	50	5	36	—	8-SOIC	Active
AD818ARZ-REEL7	Analog Devices	Voltage Feedback	500	130 -3dB	—	—	7	50	5	36	—	8-SOIC	Active
THS4061CD	Texas Instruments	Voltage Feedback	400	180 -3dB	3	2500	7.8	115	9	33	0 ~ 70	8-SOIC	Active
THS4061CDR	Texas Instruments	Voltage Feedback	400	180 -3dB	3	2500	7.8	115	9	33	0 ~ 70	8-SOIC	Active
INA145UA/2K5	Texas Instruments	Differential	0.45	0.5 -3dB	0.05	200	0.57	15	4.5	36	-40 ~ 85	8-SOIC	Active
INA149AID	Texas Instruments	Differential	5	0.5 -3dB	—	350	0.81	25	4	36	-40 ~ 125	8-SOIC	Active
INA149AIDR	Texas Instruments	Differential	5	0.5 -3dB	—	350	0.81	25	4	36	-40 ~ 125	8-SOIC	Active

Engineering Selection Recommendations

Recommended Primary Substitute: AD848JRZ

The AD848JRZ is an active general purpose operational amplifier from Analog Devices Inc. that provides direct functional equivalence to the LT1225CS8#PBF. Both devices share identical 8-SOIC packaging, single circuit configuration, and general purpose amplifier classification. The AD848JRZ delivers superior gain bandwidth product (175 MHz versus 150 MHz), lower input bias current (3.3 µA versus 4 µA), and reduced input offset voltage (200 µV versus 500 µV). The extended supply voltage range (9V to 36V versus 5V to 30V) accommodates broader application requirements. Operating temperature range matches the original specification (0°C to 70°C). RoHS3 compliance and MSL 1 rating maintain environmental and reliability standards. Active product status ensures continued availability and manufacturing support.

Secondary Substitute: AD818ARZ or AD818ARZ-REEL7

The AD818ARZ and AD818ARZ-REEL7 are voltage feedback amplifiers in 8-SOIC packaging offering enhanced slew rate (500V/µs versus 400V/µs) and higher -3dB bandwidth (130 MHz). These devices provide higher output current capability (50 mA versus 40 mA) and extended maximum supply voltage (36V versus 30V). Voltage feedback topology differs from the general purpose classification of the original part but maintains compatibility with 8-SOIC surface mount requirements. Active product status and RoHS3 compliance are confirmed. The AD818ARZ-REEL7 variant offers cut tape and Digi-Reel packaging for high-volume procurement.

Alternative Substitute: THS4061CD or THS4061CDR

The THS4061CD and THS4061CDR are Texas Instruments voltage feedback amplifiers in 8-SOIC packaging with matched slew rate (400V/µs) and superior -3dB bandwidth (180 MHz). These devices deliver significantly higher output current capability (115 mA versus 40 mA), enabling applications requiring substantial load drive. Minimum supply voltage requirement increases to 9V, restricting use in 5V single supply systems. Operating temperature range matches the original specification (0°C to 70°C). RoHS3 compliance and MSL 1 rating are maintained. Active product status ensures long-term availability.

Differential Amplifier Alternatives: INA145UA/2K5, INA149AID, INA149AIDR

The INA145UA/2K5, INA149AID, and INA149AIDR are differential amplifier configurations in 8-SOIC packaging. These devices are applicable only to applications requiring differential input signal processing. The INA145UA/2K5 operates with minimal supply current (0.57 mA) and extended temperature range (-40°C to 85°C). The INA149AID and INA149AIDR provide wider operating temperature range (-40°C to 125°C) and higher slew rate (5V/µs). Significantly reduced bandwidth (0.5 MHz -3dB) restricts these devices to low-frequency differential measurement applications. RoHS3 compliance is confirmed for all variants.

Packaging Consideration: AD8067ARTZ-REEL7

The AD8067ARTZ-REEL7 is a voltage feedback amplifier with superior performance characteristics (640V/µs slew rate, 54 MHz -3dB bandwidth, 0.6 pA input bias current) but requires redesign due to SOT-23-5 package incompatibility with the 8-SOIC footprint of the original part. This device is applicable only when PCB layout modification is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the AD848JRZ directly replace the LT1225CS8#PBF without PCB modification?

A: Yes. The AD848JRZ is housed in the identical 8-SOIC (0.154", 3.90mm Width) package with matching pin configuration for general purpose amplifier applications. No PCB layout changes are required. Pin-for-pin compatibility is maintained for standard operational amplifier configurations.

Q: What is the primary difference between the LT1225CS8#PBF and AD818ARZ?

A: The LT1225CS8#PBF is classified as a general purpose amplifier, while the AD818ARZ is a voltage feedback amplifier. Both devices operate in 8-SOIC packaging and share compatible supply voltage ranges (5V minimum). The AD818ARZ provides higher slew rate (500V/µs versus 400V/µs) and greater output current capability (50 mA versus 40 mA). Voltage feedback topology may require circuit optimization for specific applications.

Q: Are the THS4061CD and THS4061CDR electrically identical?

A: Yes. The THS4061CD and THS4061CDR are electrically identical voltage feedback amplifiers. The primary distinction is packaging format: THS4061CD is supplied in tube packaging, while THS4061CDR is supplied in tape and reel format. Both devices are housed in 8-SOIC packages and deliver identical electrical performance.

Q: Why is the AD8067ARTZ-REEL7 not recommended as a direct substitute?

A: The AD8067ARTZ-REEL7 is housed in SOT-23-5 package, which is physically and electrically incompatible with the 8-SOIC footprint of the LT1225CS8#PBF. PCB redesign and component relayout would be required. This device is applicable only when system redesign is acceptable.

Q: Can differential amplifiers such as INA149AID replace the LT1225CS8#PBF?

A: Differential amplifiers are not functional equivalents for general purpose amplifier applications. The INA149AID and related differential devices are designed for differential input signal processing with significantly reduced bandwidth (0.5 MHz -3dB). These devices are applicable only to low-frequency differential measurement circuits and require complete circuit redesign.

Q: What is the significance of the Last Time Buy status for the LT1225CS8#PBF?

A: Last Time Buy status indicates that Analog Devices Inc. has discontinued production of the LT1225CS8#PBF. Existing inventory is limited and will not be replenished. Transition to an active substitute part is necessary for long-term system support and future procurement requirements.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All substitute parts listed in this document maintain RoHS3 compliance, ensuring compatibility with environmental and regulatory requirements applicable to the original LT1225CS8#PBF.

Q: What is the minimum supply voltage requirement for the THS4061CD?

A: The THS4061CD requires a minimum supply voltage of 9V, compared to 5V for the LT1225CS8#PBF. Applications operating at 5V single supply cannot use the THS4061CD without additional power supply modifications.

Q: How does input offset voltage affect circuit performance?

A: Input offset voltage represents the DC voltage differential required at the amplifier inputs to produce zero output voltage. The LT1225CS8#PBF specifies 500 µV maximum offset, while the AD848JRZ specifies 200 µV. Lower offset voltage reduces DC error in precision applications. The THS4061CD specifies 2.5 mV offset, which may require offset nulling in precision circuits.

Q: What packaging options are available for the AD818ARZ?

A: The AD818ARZ is available in three packaging variants: AD818ARZ (tube packaging), AD818ARZ-REEL (tape and reel), and AD818ARZ-REEL7 (cut tape and Digi-Reel). All variants are housed in 8-SOIC packages with identical electrical specifications. Selection depends on procurement volume and assembly process requirements.

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