ISL28488FAZ Equivalent & Substitute Parts

Part Overview

The ISL28488FAZ is a general-purpose operational amplifier manufactured by Renesas Electronics Corporation, configured as a 4-circuit rail-to-rail amplifier in a 16-QSOP surface mount package. This device is classified as obsolete, necessitating identification of active substitute components for new designs and production continuity. The ISL28488FAZ operates across a supply voltage range of 2.4 V to 5.5 V with an operating temperature range of -40°C to 125°C, making it suitable for industrial and extended-temperature applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	ISL28488FAZ
Manufacturer	Renesas Electronics Corporation
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Output Type	Rail-to-Rail
Package / Case	16-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply Span (Min)	2.4 V
Voltage - Supply Span (Max)	5.5 V
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution of the ISL28488FAZ is determined by the following critical parameters:

Primary Compatibility Criteria:

Number of circuits: 4 channels
Output type: Rail-to-Rail configuration
Package type: 16-SSOP surface mount
Supply voltage range: Minimum 2.4 V to maximum 5.5 V
Operating temperature range: Extended range (-40°C to 125°C preferred for industrial applications)
Mounting type: Surface mount

Substitute Categories:

The LTC6085 series (LTC6085CGN#PBF, LTC6085CGN#TRPBF, LTC6085HGN#PBF, LTC6085HGN#TRPBF) from Analog Devices Inc. provides direct functional equivalence with identical circuit count, output type, and package configuration. These devices are active products with ROHS3 compliance and superior electrical performance characteristics.

The OPA4340EA series (OPA4340EA/250, OPA4340EA/2K5) from Texas Instruments offers alternative substitution with identical package and circuit configuration. These microPOWER™ series amplifiers provide enhanced performance specifications while maintaining package compatibility.

All substitute parts maintain the 16-SSOP package footprint, enabling direct PCB-level replacement without layout modifications.

Parameter Comparison

Parameter	ISL28488FAZ	LTC6085CGN#PBF	LTC6085CGN#TRPBF	LTC6085HGN#PBF	LTC6085HGN#TRPBF	OPA4340EA/250	OPA4340EA/2K5
Manufacturer	Renesas Electronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Number of Circuits	4	4	4	4	4	4	4
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate	0.15 V/µs	0.5 V/µs	0.5 V/µs	0.5 V/µs	0.5 V/µs	6 V/µs	6 V/µs
Gain Bandwidth Product	300 kHz	1.5 MHz	1.5 MHz	1.5 MHz	1.5 MHz	5.5 MHz	5.5 MHz
Current - Input Bias	10 pA	1 pA	1 pA	1 pA	1 pA	0.2 pA	0.2 pA
Voltage - Input Offset	50 µV	300 µV	300 µV	300 µV	300 µV	150 µV	150 µV
Current - Supply	60 µA (x4 Channels)	110 µA (x4 Channels)	110 µA (x4 Channels)	110 µA (x4 Channels)	110 µA (x4 Channels)	750 µA (x4 Channels)	750 µA (x4 Channels)
Current - Output / Channel	31 mA	12.5 mA	12.5 mA	12.5 mA	12.5 mA	50 mA	50 mA
Voltage - Supply Span (Min)	2.4 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V	2.5 V
Voltage - Supply Span (Max)	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V
Operating Temperature	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-SSOP (0.154", 3.90mm Width)	16-SSOP (0.154", 3.90mm Width)	16-SSOP (0.154", 3.90mm Width)	16-SSOP (0.154", 3.90mm Width)	16-SSOP (0.154", 3.90mm Width)	16-SSOP (0.154", 3.90mm Width)	16-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

For Extended Temperature Range Applications (-40°C to 125°C):

The LTC6085HGN#PBF and LTC6085HGN#TRPBF from Analog Devices Inc. are the primary substitutes for the ISL28488FAZ. Both devices maintain the full industrial temperature range of -40°C to 125°C, matching the original component's thermal specifications. The LTC6085HGN#TRPBF variant in Tape & Reel packaging is preferred for high-volume production environments. These devices are active products with ROHS3 compliance and unlimited moisture sensitivity rating.

For Standard Temperature Range Applications (0°C to 70°C):

The LTC6085CGN#PBF and LTC6085CGN#TRPBF variants operate within the 0°C to 70°C temperature range and are suitable for commercial-grade applications. The Tape & Reel variant (LTC6085CGN#TRPBF) is recommended for automated assembly processes.

For Enhanced Performance Requirements:

The OPA4340EA/250 and OPA4340EA/2K5 from Texas Instruments provide superior electrical performance with higher slew rate (6 V/µs versus 0.5 V/µs), increased gain bandwidth product (5.5 MHz versus 1.5 MHz), and higher output current capability (50 mA versus 12.5 mA). These devices operate within the -40°C to 85°C temperature range and are suitable for applications requiring faster signal processing. The OPA4340EA/2K5 variant in Cut Tape & Digi-Reel® packaging is preferred for standard production volumes.

All substitute parts maintain identical 16-SSOP package footprints and are ROHS3 compliant, enabling direct PCB-level replacement without design modifications.

Frequently Asked Questions (FAQ)

Q: Can the LTC6085 series directly replace the ISL28488FAZ without PCB modifications?

A: Yes. The LTC6085 series maintains identical 16-SSOP package dimensions (0.154" width, 3.90mm) and pin configuration, enabling direct PCB-level replacement. No layout modifications are required.

Q: What is the primary difference between LTC6085CGN and LTC6085HGN variants?

A: The operating temperature range differs. The LTC6085CGN operates from 0°C to 70°C (commercial grade), while the LTC6085HGN operates from -40°C to 125°C (industrial grade). For applications requiring the full industrial temperature range of the original ISL28488FAZ, the LTC6085HGN variant is required.

Q: What is the difference between #PBF and #TRPBF packaging designations?

A: #PBF indicates Tube packaging, suitable for manual handling and lower-volume applications. #TRPBF indicates Tape & Reel packaging, optimized for automated pick-and-place assembly in high-volume production environments.

Q: Are the OPA4340EA variants suitable for all ISL28488FAZ applications?

A: The OPA4340EA series provides enhanced performance specifications but operates within a narrower temperature range (-40°C to 85°C versus -40°C to 125°C). Applications requiring operation above 85°C must use the LTC6085HGN series. The OPA4340EA series also exhibits higher supply current consumption (750 µA versus 110 µA), which may impact power budget in battery-powered designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (LTC6085 series and OPA4340EA series) are ROHS3 compliant, matching the compliance status of the original ISL28488FAZ.

Q: What is the moisture sensitivity rating difference between the original part and substitutes?

A: The ISL28488FAZ and OPA4340EA series have MSL 2 (1 Year) rating. The LTC6085 series has MSL 1 (Unlimited) rating, indicating superior moisture resistance and extended shelf life without baking requirements.

Q: Can I use the LTC6085CGN#PBF in an application requiring -40°C to 125°C operation?

A: No. The LTC6085CGN variant is rated only for 0°C to 70°C operation. For full industrial temperature range compatibility, the LTC6085HGN variant is required.

Q: What are the key electrical performance differences between substitute options?

A: The LTC6085 series provides moderate performance enhancement (1.5 MHz bandwidth, 0.5 V/µs slew rate) with low supply current (110 µA). The OPA4340EA series provides significant performance enhancement (5.5 MHz bandwidth, 6 V/µs slew rate, 50 mA output current) at the cost of higher supply current consumption (750 µA). Selection depends on application bandwidth and output drive requirements.

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