LS404IN Equivalent & Substitute Parts

Part Overview

The LS404IN is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-DIP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The LS404IN features a slew rate of 1.5V/µs, gain bandwidth product of 3 MHz, and operates across a wide supply voltage range of 8V to 60V with an operating temperature range of -40°C to 105°C. Substitution is required due to product discontinuation and limited inventory availability.

Key Parameters

Parameter	LS404IN Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
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 to 105	°C
Package / Case	14-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the LS404IN is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of circuits: 4 (mandatory)
Package type: 14-DIP (0.300", 7.62mm) (mandatory)
Mounting type: Through Hole (mandatory)
Amplifier type: General Purpose (preferred for direct replacement)
Supply voltage range compatibility: Substitute must support the application's required voltage span
Operating temperature range: Substitute must cover or exceed the required temperature range
Slew rate, gain bandwidth product, and input bias current: Must be equal to or exceed the LS404IN specifications for functional compatibility

Substitution Logic: Substitute parts are grouped into two categories based on amplifier type:

General Purpose Amplifiers (Direct Substitutes): Parts with identical amplifier type classification, maintaining functional equivalence for standard applications.
J-FET Amplifiers (Alternative Substitutes): Parts with J-FET input architecture, offering superior input bias current characteristics but requiring verification of application-specific requirements.

All substitute parts listed maintain the 14-DIP package format and through-hole mounting configuration, ensuring mechanical compatibility with existing PCB designs.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
LS404IN	STMicroelectronics	General Purpose	1.5	3	50	8	60	-40 to 105	Obsolete
LM324N/NOPB	Texas Instruments	General Purpose	—	1	45	3	32	0 to 70	Active
LT1212CN#PBF	Analog Devices Inc.	General Purpose	7	14	50	2.5	36	-40 to 85	Active
LT1212IN#PBF	Analog Devices Inc.	General Purpose	7	14	50	2.5	36	-40 to 85	Active
LT1214CN#PBF	Analog Devices Inc.	General Purpose	12	28	90	2.5	36	-40 to 85	Active
LT1216CN#PBF	Analog Devices Inc.	General Purpose	50	23	360	2.5	36	0 to 70	Last Time Buy
OP490GPZ	Analog Devices Inc.	General Purpose	0.012	0.02	4.2	1.6	36	-40 to 85	Active
OPA4137P	Burr Brown	J-FET	3.5	1	5 pA	4.5	36	-40 to 85	Active
OPA4137PA	Texas Instruments	J-FET	3.5	1	5 pA	4.5	36	-40 to 85	Last Time Buy
TL3474ACN	Texas Instruments	General Purpose	13	4	100	4	36	0 to 70	Last Time Buy
TL3474AIN	Texas Instruments	General Purpose	13	4	100	4	36	-40 to 105	Last Time Buy

Engineering Selection Recommendations

Active Product Substitutes (Recommended for New Designs):

The LT1212CN#PBF and LT1212IN#PBF from Analog Devices Inc. are active products offering superior performance characteristics compared to the obsolete LS404IN. Both parts maintain the 4-circuit general-purpose amplifier configuration in 14-DIP packaging with through-hole mounting. These devices provide increased slew rate (7V/µs versus 1.5V/µs) and higher gain bandwidth product (14 MHz versus 3 MHz), enabling improved dynamic performance. Operating temperature range extends to -40°C to 85°C, covering the lower end of the LS404IN specification. Supply voltage range of 2.5V to 36V accommodates most applications, though designs requiring the full 60V maximum of the LS404IN require alternative selection.

The LM324N/NOPB from Texas Instruments is an active general-purpose 4-circuit amplifier in 14-DIP format with extensive availability. This part operates at lower supply voltages (3V to 32V) and reduced operating temperature range (0°C to 70°C), making it suitable for commercial-grade applications with relaxed temperature requirements.

Last Time Buy Products (Limited Availability):

The TL3474AIN from Texas Instruments provides extended operating temperature coverage (-40°C to 105°C) matching the LS404IN specification, with improved slew rate (13V/µs) and gain bandwidth product (4 MHz). This part is classified as Last Time Buy, indicating limited future availability.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the LS404IN. Moisture sensitivity level is classified as 1 (Unlimited) for all active substitutes, indicating no special handling requirements.

J-FET Alternative Substitutes:

The OPA4137P and OPA4137PA offer J-FET input architecture with significantly reduced input bias current (5 pA versus 50 nA), suitable for high-impedance signal conditioning applications. These parts require verification of application-specific requirements due to different amplifier topology.

Frequently Asked Questions (FAQ)

Q: Can the LM324N/NOPB directly replace the LS404IN in all applications?

A: The LM324N/NOPB maintains the 4-circuit general-purpose amplifier configuration and 14-DIP package format. However, the reduced supply voltage range (3V to 32V maximum versus 60V maximum) and narrower operating temperature range (0°C to 70°C versus -40°C to 105°C) require verification against application requirements. The lower gain bandwidth product (1 MHz versus 3 MHz) may impact frequency response in bandwidth-sensitive circuits.

Q: What is the primary advantage of LT1212CN#PBF and LT1212IN#PBF substitutes?

A: Both LT1212 variants are active products with extended availability, offering superior slew rate (7V/µs) and gain bandwidth product (14 MHz) compared to the LS404IN. These improvements enable faster signal processing and wider bandwidth applications. Both parts maintain the 4-circuit configuration, 14-DIP package, and through-hole mounting. The primary limitation is the reduced maximum supply voltage (36V versus 60V).

Q: Are J-FET amplifiers (OPA4137P, OPA4137PA) suitable replacements?

A: J-FET amplifiers offer dramatically reduced input bias current (5 pA versus 50 nA), making them superior for high-impedance applications. However, the different amplifier topology requires circuit verification. The reduced supply voltage range (4.5V to 36V) and lower gain bandwidth product (1 MHz) may not suit all applications. These parts are recommended only when input bias current characteristics are critical to application performance.

Q: What packaging considerations apply to all substitute parts?

A: All substitute parts listed maintain the 14-DIP (0.300", 7.62mm) package format with through-hole mounting, ensuring mechanical compatibility with existing PCB designs. No PCB layout modifications are required for package accommodation.

Q: Which substitute offers the closest performance match to the LS404IN?

A: The TL3474AIN provides the closest performance alignment, offering extended operating temperature range (-40°C to 105°C) matching the LS404IN specification, with improved slew rate (13V/µs) and gain bandwidth product (4 MHz). However, this part is classified as Last Time Buy, indicating limited future procurement availability.

Q: How do supply voltage requirements affect substitute selection?

A: The LS404IN operates across 8V to 60V. Substitute parts vary significantly in maximum supply voltage: LM324N/NOPB (32V), LT1212 variants (36V), OPA4137 variants (36V), and TL3474 variants (36V). Applications requiring operation above 36V have limited substitute options and may require circuit redesign or continued use of remaining LS404IN inventory.

Q: Are all substitute parts RoHS3 compliant?

A: All active and Last Time Buy substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the LS404IN. Moisture sensitivity level is classified as 1 (Unlimited) for all parts, indicating no special storage or handling requirements.

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