LS404IDT Equivalent & Substitute Parts

Part Overview

The LS404IDT 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, indicating it is no longer in active production. The identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for applications currently utilizing the LS404IDT.

Key Parameters

Parameter	LS404IDT Value
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LS404IDT are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Number of Circuits: 4 (quad configuration required)
Package / Case: 14-SOIC (0.154", 3.90mm Width) (physical and electrical pin compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Amplifier Type: General Purpose (functional classification)
Category: Linear, Amplifiers (device class)

Secondary Compatibility Considerations:

Slew Rate: 1.5 V/µs or higher
Gain Bandwidth Product: 3 MHz or higher
Current - Input Bias: 50 nA or lower
Voltage - Input Offset: 3 mV or lower
Current - Supply: 1.3 mA or lower per device
Current - Output / Channel: 23 mA or higher
Voltage - Supply Span: Minimum 8 V to 60 V maximum (or compatible subset)
Operating Temperature: -40°C to 105°C or extended range
RoHS3 Compliance and MSL rating

Substitute parts are grouped into two categories: Direct Substitutes (pin-compatible replacements from the same manufacturer with active product status) and Similar Substitutes (functionally equivalent devices from alternative manufacturers or with different amplifier topologies that meet or exceed performance specifications).

Parameter Comparison

Parameter	LS404IDT	TS514IDT	ADTL084ARZ	ADTL084ARZ-REEL	ADTL084ARZ-REEL7	AS324AMTR-E1	AS324MTR-E1	LM124D	LM124DG4	LM124DR	LM124DRG4
Manufacturer	STMicroelectronics	STMicroelectronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Diodes Incorporated	Diodes Incorporated	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	General Purpose	J-FET	J-FET	J-FET	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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate	1.5 V/µs	1.5 V/µs	20 V/µs	20 V/µs	20 V/µs	Not Specified	Not Specified	0.4 V/µs	0.5 V/µs	0.5 V/µs	0.5 V/µs
Gain Bandwidth Product	3 MHz	3 MHz	5 MHz	5 MHz	5 MHz	Not Specified	Not Specified	1.2 MHz	1.2 MHz	1.2 MHz	1.2 MHz
Current - Input Bias	50 nA	50 nA	2 pA	2 pA	2 pA	20 nA	20 nA	20 nA	20 nA	20 nA	20 nA
Voltage - Input Offset	3 mV	500 µV	1.5 mV	1.5 mV	1.5 mV	2 mV	2 mV	2 mV	3 mV	3 mV	3 mV
Current - Supply	1.3 mA	500 µA	1.2 mA	1.2 mA	1.2 mA	1 mA	1 mA	1.5 mA	1.4 mA	1.4 mA	1.4 mA
Current - Output / Channel	23 mA	23 mA	27 mA	27 mA	27 mA	40 mA	40 mA	30 mA	30 mA	30 mA	30 mA
Voltage - Supply Span (Min)	8 V	6 V	8 V	8 V	8 V	3 V	3 V	3 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	60 V	30 V	36 V	36 V	36 V	36 V	36 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 ~ 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
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Obsolete	Last Time Buy	Active	Discontinued at DiGi Electronics
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 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitute (Recommended Primary Choice):

The TS514IDT from STMicroelectronics is the direct substitute for the LS404IDT. Both devices share identical electrical specifications for slew rate (1.5 V/µs), gain bandwidth product (3 MHz), input bias current (50 nA), and output current per channel (23 mA). The TS514IDT is currently in active production status, ensuring long-term availability. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited). The TS514IDT features improved input offset voltage (500 µV versus 3 mV) and reduced supply current (500 µA versus 1.3 mA), providing enhanced performance characteristics. The minimum supply voltage is reduced to 6 V, and maximum operating temperature is extended to 125°C. This part is available in Cut Tape and Digi-Reel packaging formats.

Alternative Substitutes (Secondary Choices):

The LM124DR from Texas Instruments is an active product offering extended operating temperature range (-55°C to 125°C) and is available in high inventory quantities (171,766 pieces). This device maintains the 14-SOIC package and quad configuration. The LM124DR features differential output type and lower gain bandwidth product (1.2 MHz), which may be suitable for applications not requiring the full 3 MHz bandwidth of the LS404IDT.

The AS324AMTR-E1 and AS324MTR-E1 from Diodes Incorporated are general purpose quad amplifiers in 14-SOIC packages with active product status. These devices offer superior output current capability (40 mA per channel versus 23 mA) and lower minimum supply voltage (3 V). The AS324AMTR-E1 maintains MSL rating of 1, while the AS324MTR-E1 has MSL rating of 3 (168 Hours).

The ADTL084ARZ-REEL7 from Analog Devices Inc. is a J-FET amplifier offering significantly improved slew rate (20 V/µs) and gain bandwidth product (5 MHz), with extremely low input bias current (2 pA). This device is suitable for applications requiring high-speed performance and is available in the largest inventory quantity (44,200 pieces). The J-FET topology provides different input characteristics compared to the bipolar LS404IDT.

Compliance and Certification Status:

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. All parts maintain ECCN classification of EAR99 and HTSUS code 8542.33.0001, consistent with the original LS404IDT.

Frequently Asked Questions (FAQ)

Q: Can the TS514IDT be used as a direct replacement for the LS404IDT without circuit modifications?

A: Yes. The TS514IDT is a direct substitute with identical pin configuration, package type (14-SOIC), and core electrical specifications (slew rate, gain bandwidth product, input bias current, output current). Both devices are quad general purpose amplifiers. The TS514IDT offers improved specifications in input offset voltage and supply current, making it a superior replacement. No circuit modifications are required.

Q: What is the primary difference between the LS404IDT and the ADTL084ARZ-REEL7?

A: The primary difference is amplifier topology. The LS404IDT uses a bipolar input stage with 50 nA input bias current, while the ADTL084ARZ-REEL7 uses a J-FET input stage with 2 pA input bias current. The ADTL084ARZ-REEL7 also provides superior slew rate (20 V/µs versus 1.5 V/µs) and gain bandwidth product (5 MHz versus 3 MHz). The ADTL084ARZ-REEL7 is suitable for high-impedance input applications and high-speed signal processing. The maximum supply voltage is limited to 36 V compared to 60 V for the LS404IDT.

Q: Why does the LS404IDT have a maximum supply voltage of 60 V while most substitutes are limited to 30-36 V?

A: The LS404IDT was designed for applications requiring higher supply voltage operation. Most modern general purpose quad amplifiers are optimized for lower supply voltages (30 V or less) to reduce power consumption and heat dissipation. If your application requires 60 V operation, the LS404IDT or TS514IDT (which supports up to 30 V) may be necessary. Verify your actual supply voltage requirement before selecting a substitute.

Q: Are all substitute parts available in the same packaging options as the LS404IDT?

A: The LS404IDT is specified with packaging notation "-" in the provided data. All substitute parts are available in 14-SOIC surface mount packages, which is the standard package for quad operational amplifiers. Packaging options vary by part number: some are available in Cut Tape and Digi-Reel formats, others in Tube or Tape & Reel formats. Verify packaging availability with your supplier based on your assembly requirements.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating difference between AS324AMTR-E1 (MSL 1) and AS324MTR-E1 (MSL 3)?

A: MSL rating indicates moisture sensitivity during storage and handling. MSL 1 (Unlimited) means the component can be stored indefinitely without moisture control. MSL 3 (168 Hours) means the component must be used within 168 hours of opening the moisture barrier bag, or it must be baked to remove absorbed moisture before use. For applications with standard manufacturing timelines, both ratings are acceptable. MSL 1 rated parts offer greater flexibility in inventory management.

Q: Can the LM124DR be used in applications requiring the full 3 MHz gain bandwidth product of the LS404IDT?

A: The LM124DR has a gain bandwidth product of 1.2 MHz, which is lower than the LS404IDT specification of 3 MHz. The LM124DR is suitable for applications with bandwidth requirements up to 1.2 MHz. For applications requiring 3 MHz bandwidth, use the TS514IDT, ADTL084ARZ variants, or AS324 variants, which meet or exceed this specification.

Q: What is the operating temperature range consideration when selecting a substitute?

A: The LS404IDT operates from -40°C to 105°C. The TS514IDT extends the upper limit to 125°C. The LM124 variants extend the lower limit to -55°C. Select based on your application's temperature requirements. If your application operates within -40°C to 105°C, any substitute is acceptable. If extended low-temperature operation is required, use LM124 variants. If extended high-temperature operation is required, use TS514IDT or ADTL084 variants.

Q: Is the LS404IDT still available for purchase despite its obsolete status?

A: The LS404IDT is listed as obsolete, indicating it is no longer manufactured. However, 1,560 pieces are reported in stock as new original inventory. Availability is limited and will diminish over time. For new designs or long-term production requirements, transition to an active product such as TS514IDT, LM124DR, or AS324 variants to ensure sustained component availability.

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