LT1230CS Equivalent & Substitute Parts

Part Overview

The LT1230CS is a current feedback amplifier integrated circuit manufactured by Analog Devices Inc., containing four independent amplifier circuits in a 14-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LT1230CS operates across a wide supply voltage range of 4V to 30V and delivers high slew rate performance of 700V/µs with 100 MHz bandwidth, making it suitable for high-speed signal conditioning applications.

Due to Last Time Buy status, alternative equivalent and substitute parts are necessary for new designs and long-term production planning. Substitute devices are selected based on matching electrical performance parameters, package compatibility, and functional equivalence within the linear amplifier category.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Current Feedback	—
Number of Circuits	4	—
Slew Rate	700	V/µs
-3dB Bandwidth	100	MHz
Current - Input Bias	10	µA
Voltage - Input Offset	3	mV
Current - Supply (per 4 Channels)	6	mA
Current - Output / Channel	125	mA
Voltage - Supply Span (Min)	4	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
Package / Case	14-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 LT1230CS are identified based on the following substitution criteria:

Primary Substitution Criteria:

Number of circuits: 4 independent amplifier channels
Package type: 14-SOIC or 16-SOIC surface mount packages
Supply voltage range compatibility: Minimum 4V to 5V, Maximum 30V or greater
Operating temperature range: 0°C to 70°C or extended range
Surface mount technology for PCB assembly compatibility
RoHS3 compliance and MSL Level 1 rating

Electrical Performance Considerations:

Slew rate: 700V/µs or higher
Bandwidth: 100 MHz or higher (-3dB or Gain Bandwidth Product)
Input bias current: 10 µA or lower
Output current capability: 60 mA or higher per channel
Input offset voltage: 3 mV or lower

Substitute devices are grouped by amplifier topology (current feedback, voltage feedback, or general purpose) and performance tier. Devices with different topologies are included when they meet the core electrical and mechanical requirements for functional replacement in typical applications.

Parameter Comparison

Parameter	LT1230CS	LT1365CS#PBF	ADA4077-4ARZ	ADA4077-4ARZ-R7	ADA4077-4ARZ-RL	TS524IDT
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	STMicroelectronics
Amplifier Type	Current Feedback	Voltage Feedback	General Purpose	General Purpose	General Purpose	Audio
Number of Circuits	4	4	4	4	4	4
Slew Rate (V/µs)	700	1000	1.2	1.2	1.2	7
Bandwidth / Gain Bandwidth Product	100 MHz	70 MHz	3.6 MHz	3.6 MHz	3.6 MHz	15 MHz
Current - Input Bias	10 µA	600 nA	400 pA	400 pA	400 pA	250 nA
Voltage - Input Offset	3 mV	500 µV	15 µV	15 µV	15 µV	950 µV
Current - Supply (x4 Channels)	6 mA	6.3 mA	400 µA	400 µA	400 µA	8 mA
Current - Output / Channel	125 mA	60 mA	10 mA	10 mA	10 mA	37 mA
Voltage - Supply Span (Min)	4 V	5 V	5 V	5 V	5 V	5 V
Voltage - Supply Span (Max)	30 V	36 V	30 V	30 V	30 V	30 V
Operating Temperature	0°C to 70°C	0°C to 70°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package / Case	14-SOIC	16-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LT1365CS#PBF is the manufacturer-recommended substitute for the LT1230CS. This device maintains four-circuit configuration and operates within the same temperature range (0°C to 70°C). The LT1365CS#PBF features voltage feedback topology with enhanced slew rate (1000V/µs) and operates across a slightly wider supply voltage range (5V to 36V). The 16-SOIC package requires PCB layout modification compared to the 14-SOIC footprint. Product status is Active with full production availability. RoHS3 compliance and MSL Level 1 rating match the original device specifications.

ADA4077-4ARZ, ADA4077-4ARZ-R7, and ADA4077-4ARZ-RL are functionally equivalent general-purpose amplifiers with identical electrical specifications across all three packaging variants. These devices are pin-compatible with the LT1230CS in 14-SOIC packages and maintain the same supply voltage range (5V to 30V). All three variants are Active products with extended operating temperature range (-40°C to 125°C). The primary differences are packaging formats: tube (ADA4077-4ARZ), cut tape with Digi-Reel (ADA4077-4ARZ-R7), and tape & reel (ADA4077-4ARZ-RL). General-purpose topology delivers lower slew rate (1.2V/µs) and bandwidth (3.6 MHz) compared to the LT1230CS, suitable for applications not requiring high-speed performance. RoHS3 compliance and MSL Level 1 rating are maintained.

TS524IDT is an audio amplifier from STMicroelectronics with four circuits in 14-SOIC package. This device operates across the same supply voltage range (5V to 30V) and maintains RoHS3 compliance and MSL Level 1 rating. Extended operating temperature range (-40°C to 125°C) exceeds the original specification. Audio topology provides intermediate performance characteristics with 7V/µs slew rate and 15 MHz gain bandwidth product. This device is suitable for audio signal processing applications requiring moderate bandwidth and slew rate performance.

All substitute devices are RoHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LT1230CS environmental specifications. Product status for all substitutes is Active, ensuring long-term availability and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the LT1365CS#PBF directly replace the LT1230CS without PCB modifications?

A: The LT1365CS#PBF uses a 16-SOIC package compared to the 14-SOIC package of the LT1230CS. PCB footprint modification is required. Pin assignments differ between the two packages, necessitating schematic and layout review before implementation.

Q: What is the primary difference between the LT1230CS and LT1365CS#PBF?

A: The LT1230CS employs current feedback topology, while the LT1365CS#PBF uses voltage feedback topology. The LT1365CS#PBF delivers higher slew rate (1000V/µs versus 700V/µs) and operates across a wider supply voltage range (5V to 36V versus 4V to 30V). Both devices contain four independent amplifier circuits.

Q: Are the ADA4077-4ARZ variants interchangeable with each other?

A: The ADA4077-4ARZ, ADA4077-4ARZ-R7, and ADA4077-4ARZ-RL are electrically identical devices with identical pin configurations and performance specifications. The differences are packaging and delivery formats: tube, cut tape with Digi-Reel, and tape & reel respectively. Selection depends on assembly process requirements and inventory management preferences.

Q: Why do the ADA4077 devices have lower bandwidth than the LT1230CS?

A: The ADA4077 series are general-purpose amplifiers designed for broad application compatibility with lower power consumption (400µA total supply current versus 6mA). The LT1230CS is optimized for high-speed applications with 100 MHz bandwidth. Application requirements determine whether the reduced bandwidth of the ADA4077 is acceptable.

Q: Is the TS524IDT suitable for high-speed signal conditioning?

A: The TS524IDT is an audio amplifier with 7V/µs slew rate and 15 MHz gain bandwidth product. These specifications are lower than the LT1230CS (700V/µs, 100 MHz). The TS524IDT is suitable for audio and moderate-bandwidth applications but not for high-speed signal conditioning requiring the performance of the original device.

Q: Do all substitute parts maintain the same operating temperature range as the LT1230CS?

A: The LT1230CS and LT1365CS#PBF both operate from 0°C to 70°C. The ADA4077 variants and TS524IDT extend the operating range to -40°C to 125°C, providing broader temperature coverage. Applications requiring operation only within 0°C to 70°C can use any substitute without temperature-related constraints.

Q: What compliance certifications are maintained across all substitute devices?

A: All substitute devices (LT1365CS#PBF, ADA4077-4ARZ, ADA4077-4ARZ-R7, ADA4077-4ARZ-RL, and TS524IDT) are RoHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LT1230CS specifications. REACH status is unaffected for all devices.

Q: Which substitute offers the closest performance match to the LT1230CS?

A: The LT1365CS#PBF provides the closest performance match with four circuits, similar operating temperature range, and comparable supply voltage specifications. However, package differences and topology variation (voltage feedback versus current feedback) require design review. For pin-compatible 14-SOIC replacement, the ADA4077 variants maintain identical package footprint but deliver reduced bandwidth and slew rate performance.

Q: Can the LT1230CS be used in applications designed for the TS524IDT?

A: The LT1230CS can be used in applications designed for the TS524IDT due to superior performance specifications (higher slew rate and bandwidth). However, the LT1230CS is optimized for high-speed applications and may introduce unnecessary cost and power consumption in audio-specific designs. Application requirements should guide substitution direction.

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