LS404ID Equivalent & Substitute Parts

Part Overview

The LS404ID is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-SOIC surface-mount package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The LS404ID operates across a wide supply voltage range and is suitable for general-purpose amplification applications requiring moderate bandwidth and slew rate performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	LS404ID
Manufacturer	STMicroelectronics
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	1.5 V/µs
Gain Bandwidth Product	3 MHz
Current - Input Bias	50 nA
Voltage - Input Offset	3 mV
Current - Supply	1.3 mA
Current - Output / Channel	23 mA
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	60 V
Operating Temperature	-40°C ~ 105°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LS404ID is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 14-SOIC (0.154", 3.90mm Width) surface-mount package to ensure direct PCB footprint compatibility.

Circuit Configuration: The LS404ID contains 4 operational amplifier circuits. Substitute parts must maintain this 4-circuit configuration.

Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of the LS404ID (8 V minimum to 60 V maximum) or provide a compatible subset. The slew rate (1.5 V/µs), gain bandwidth product (3 MHz), input bias current (50 nA), and input offset voltage (3 mV) establish the baseline performance characteristics.

Amplifier Type Classification: The LS404ID is classified as a general-purpose amplifier. Substitute parts may be general-purpose or specialized types (such as J-FET input amplifiers) provided they meet the electrical performance requirements and package specifications.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and MSL rating of 1 or lower to ensure manufacturing and storage compatibility.

Parameter Comparison

Parameter	LS404ID	ADTL084ARZ	ADTL084ARZ-REEL	ADTL084ARZ-REEL7	AS324AMTR-E1	AS324MTR-E1	LM124D	LM124DG4	LM124DR	LM124DRG4	LM224AD
Manufacturer	STMicroelectronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Diodes Incorporated	Diodes Incorporated	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments	STMicroelectronics
Amplifier Type	General Purpose	J-FET	J-FET	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Slew Rate (V/µs)	1.5	20	20	20	—	—	0.4	0.5	0.5	0.5	0.4
Gain Bandwidth Product (MHz)	3	5	5	5	—	—	1.2	1.2	1.2	1.2	1.2
Current - Input Bias (nA)	50	2	2	2	20	20	20	20	20	20	20
Voltage - Input Offset (mV)	3	1.5	1.5	1.5	2	2	2	3	3	3	2
Current - Supply (mA)	1.3	1.2	1.2	1.2	1	1	1.5	1.4	1.4	1.4	1.5
Current - Output / Channel (mA)	23	27	27	27	40	40	30	30	30	30	30
Voltage - Supply Span (Min)	8 V	8 V	8 V	8 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	60 V	36 V	36 V	36 V	36 V	36 V	30 V	30 V	30 V	30 V	30 V
Operating Temperature	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Obsolete	Last Time Buy	Active	Discontinued at DiGi Electronics	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1	1	1	1	1	3	1	1	1	1	1

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The LM124DR (Texas Instruments) is the recommended primary substitute. This part maintains active product status, ensuring long-term availability and supply chain stability. The LM124DR operates within the LS404ID supply voltage range (3 V to 30 V minimum, which overlaps the LS404ID's 8 V to 60 V range at the lower end). The electrical characteristics are closely matched, with identical input bias current (20 nA), comparable input offset voltage (3 mV), and equivalent output current capability (30 mA per channel). The operating temperature range extends to -55°C to 125°C, providing broader environmental coverage than the LS404ID.

The AS324MTR-E1 and AS324AMTR-E1 (Diodes Incorporated) provide alternative general-purpose substitutes with active product status. These parts offer superior output current capability (40 mA per channel) and lower supply current (1 mA), which may benefit power-constrained applications. However, the maximum supply voltage is limited to 36 V, which is below the LS404ID's 60 V maximum. These parts are suitable only for applications operating within the 3 V to 36 V supply range.

Secondary Substitutes (Limited Availability):

The ADTL084ARZ-REEL7 (Analog Devices Inc.) offers enhanced performance characteristics with active product status and the highest inventory availability (44,200 units). This J-FET input amplifier provides superior slew rate (20 V/µs versus 1.5 V/µs) and gain bandwidth product (5 MHz versus 3 MHz), along with significantly lower input bias current (2 pA versus 50 nA). The maximum supply voltage is limited to 36 V. This substitute is appropriate for applications requiring low input bias current and higher bandwidth performance within the 8 V to 36 V supply range.

Obsolete Alternatives (Not Recommended for New Designs):

The LM124D and LM224AD are classified as obsolete and should not be selected for new production designs. These parts are included for reference only in legacy system maintenance scenarios.

Supply Voltage Constraint:

Applications requiring the full 60 V maximum supply capability of the LS404ID cannot be directly substituted with the listed alternatives, as all substitute parts are limited to 30 V to 36 V maximum supply voltage. In such cases, circuit redesign or alternative component families must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the ADTL084ARZ-REEL7 directly replace the LS404ID in all applications?

A: The ADTL084ARZ-REEL7 is electrically compatible with the LS404ID within the overlapping supply voltage range (8 V to 36 V). However, applications requiring supply voltages above 36 V cannot use this substitute. The J-FET input architecture provides superior performance characteristics (lower input bias current, higher slew rate) but may introduce different noise characteristics and temperature drift behavior. Verification of circuit performance is necessary for applications with stringent noise or offset specifications.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating difference between AS324MTR-E1 (MSL 3) and other substitutes (MSL 1)?

A: MSL 3 indicates a maximum floor life of 168 hours at specified humidity and temperature conditions, compared to unlimited floor life for MSL 1 components. This affects storage, handling, and manufacturing processes. Components with MSL 3 require more stringent moisture control during storage and may require baking before reflow soldering. For applications with standard manufacturing processes and storage conditions, MSL 1 components are preferred.

Q: Why do the AS324AMTR-E1 and AS324MTR-E1 have different MSL ratings despite identical electrical specifications?

A: The MSL difference reflects different manufacturing lots or packaging conditions. Both parts are functionally equivalent; the MSL rating is a manufacturing and logistics parameter rather than an electrical performance indicator. Selection between these variants depends on manufacturing process requirements and storage capabilities.

Q: Is the LM124DR suitable for applications requiring the full 60 V supply capability of the LS404ID?

A: No. The LM124DR maximum supply voltage is 30 V, which is below the LS404ID's 60 V maximum. Applications operating above 30 V supply voltage cannot use the LM124DR. Alternative component families or circuit redesign must be evaluated for high-voltage applications.

Q: What are the key performance differences between general-purpose and J-FET input amplifiers in the substitute list?

A: J-FET input amplifiers (ADTL084ARZ variants) provide significantly lower input bias current (2 pA versus 20-50 nA) and higher slew rate (20 V/µs versus 0.4-1.5 V/µs). These characteristics are beneficial for high-impedance signal sources and applications requiring fast transient response. General-purpose amplifiers (LM124, AS324, LM224 variants) offer lower cost and simpler biasing requirements. Selection depends on specific application requirements for input impedance and bandwidth.

Q: Are all substitute parts available in the same packaging options as the LS404ID?

A: All listed substitute parts use the 14-SOIC (0.154", 3.90mm Width) surface-mount package, ensuring PCB footprint compatibility. However, packaging formats (tube, tape & reel, cut tape & digi-reel) vary by part number. Verify the specific packaging format required for your manufacturing process before final part selection.

Q: Which substitute offers the best long-term availability?

A: The LM124DR (Texas Instruments) is classified as active product status with the highest inventory level (171,766 units) among general-purpose substitutes. The ADTL084ARZ-REEL7 (Analog Devices Inc.) also maintains active status with substantial inventory (44,200 units) and offers enhanced performance characteristics. Both parts are suitable for long-term production commitments.

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