LS404CD Equivalent & Substitute Parts

Part Overview

The LS404CD 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, ensure supply chain availability, and support ongoing production requirements for applications utilizing this amplifier topology.

Key Parameters

Parameter	LS404CD Value
Amplifier Type	General Purpose
Number of Circuits	4
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	1 V/µs
Gain Bandwidth Product	3 MHz
Current - Input Bias	100 nA
Voltage - Input Offset	3 mV
Current - Supply	1.5 mA
Current - Output / Channel	23 mA
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	60 V
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LS404CD is determined by strict alignment of electrical and mechanical parameters within the general purpose operational amplifier category. The primary substitution criteria are:

Critical Matching Parameters:

Number of circuits: 4 (mandatory)
Package type: 14-SOIC surface mount (mandatory)
Amplifier classification: General Purpose (preferred for direct substitution)
Slew rate: minimum 1 V/µs
Gain bandwidth product: minimum 3 MHz
Supply voltage range: must encompass or exceed 8 V to 60 V span
Input bias current: maximum 100 nA
Input offset voltage: maximum 3 mV
Output current per channel: minimum 23 mA

Substitute parts are grouped into two categories:

Direct Substitutes (General Purpose Amplifiers): Parts maintaining general purpose amplifier classification with electrical parameters meeting or exceeding LS404CD specifications. These include TS514IDT, AS324AMTR-E1, AS324MTR-E1, and LM124D.

Similar Substitutes (Alternative Amplifier Types): Parts with different amplifier topologies (J-FET configuration) or differential output configurations that meet the 4-circuit, 14-SOIC package requirement. These include ADTL084ARZ variants and LM124DG4/LM124DR/LM124DRG4 series.

Parameter Comparison

Parameter	LS404CD	TS514IDT	ADTL084ARZ	AS324AMTR-E1	LM124DR
Amplifier Type	General Purpose	General Purpose	J-FET	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Slew Rate	1 V/µs	1.5 V/µs	20 V/µs	Not specified	0.5 V/µs
Gain Bandwidth Product	3 MHz	3 MHz	5 MHz	Not specified	1.2 MHz
Current - Input Bias	100 nA	50 nA	2 pA	20 nA	20 nA
Voltage - Input Offset	3 mV	500 µV	1.5 mV	2 mV	3 mV
Current - Supply	1.5 mA	500 µA	1.2 mA (x4)	1 mA (x4)	1.4 mA (x4)
Current - Output / Channel	23 mA	23 mA	27 mA	40 mA	30 mA
Voltage - Supply Span (Min)	8 V	6 V	8 V	3 V	3 V
Voltage - Supply Span (Max)	60 V	30 V	36 V	36 V	30 V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Direct Substitute: TS514IDT

The TS514IDT is the recommended direct substitute for the LS404CD. Both components are general purpose operational amplifiers with 4 circuits in 14-SOIC packaging. The TS514IDT maintains active product status with ROHS3 compliance and MSL 1 rating. Electrical parameters are equivalent or superior: slew rate of 1.5 V/µs exceeds the 1 V/µs requirement, gain bandwidth product matches at 3 MHz, and input bias current of 50 nA is lower than the 100 nA specification. The TS514IDT operates across -40°C to 125°C, providing extended temperature coverage beyond the LS404CD's 0°C to 70°C range. Supply voltage span of 6 V to 30 V is narrower than the LS404CD's 8 V to 60 V range; applications requiring the full 60 V maximum must be evaluated for compatibility.

Secondary Direct Substitutes: AS324AMTR-E1 and AS324MTR-E1

The AS324 series from Diodes Incorporated provides general purpose 4-circuit amplifiers in 14-SOIC packaging with active product status. These components feature lower input bias current (20 nA) and higher output current capability (40 mA per channel). Supply voltage range extends to 3 V minimum, providing broader low-voltage compatibility. Both variants are ROHS3 compliant. AS324AMTR-E1 carries MSL 1 rating, while AS324MTR-E1 carries MSL 3 (168 hours). Operating temperature range is -40°C to 85°C. The narrower maximum supply voltage of 36 V requires verification for applications utilizing the full 60 V capability of the LS404CD.

Alternative Substitute: ADTL084ARZ Series

The ADTL084ARZ, ADTL084ARZ-REEL, and ADTL084ARZ-REEL7 are J-FET operational amplifiers with 4 circuits in 14-SOIC packaging. These components offer superior performance characteristics: slew rate of 20 V/µs, gain bandwidth product of 5 MHz, and extremely low input bias current of 2 pA. All variants maintain active product status with ROHS3 compliance and MSL 1 rating. Operating temperature range is -40°C to 125°C. The J-FET topology differs from the general purpose configuration of the LS404CD; applications sensitive to input impedance characteristics or requiring specific frequency response should evaluate this topology change. Supply voltage range of 8 V to 36 V is narrower than the LS404CD specification.

Differential Output Alternatives: LM124 Series

The LM124D, LM124DG4, LM124DR, and LM124DRG4 are general purpose amplifiers with differential output configuration and 4 circuits in 14-SOIC packaging. LM124DR is the only active product in this group; LM124D is obsolete, LM124DG4 is last-time-buy, and LM124DRG4 is discontinued at DiGi Electronics. All variants are ROHS3 compliant with MSL 1 rating. Operating temperature range extends to -55°C to 125°C. The differential output topology represents a functional departure from the LS404CD; applications designed for single-ended outputs require circuit redesign. Supply voltage range of 3 V to 30 V is narrower than the LS404CD specification.

Frequently Asked Questions (FAQ)

Q: Can the TS514IDT directly replace the LS404CD without circuit modification?

A: The TS514IDT is electrically compatible with the LS404CD for most applications. Both components are general purpose 4-circuit operational amplifiers in identical 14-SOIC packaging with equivalent gain bandwidth product (3 MHz) and comparable slew rate. However, the maximum supply voltage of the TS514IDT is 30 V, compared to 60 V for the LS404CD. Applications operating above 30 V supply voltage require alternative substitutes or circuit redesign.

Q: What is the primary difference between the LS404CD and the ADTL084ARZ?

A: The LS404CD is a general purpose operational amplifier, while the ADTL084ARZ uses J-FET input technology. The J-FET topology provides significantly lower input bias current (2 pA versus 100 nA), higher slew rate (20 V/µs versus 1 V/µs), and higher gain bandwidth product (5 MHz versus 3 MHz). Both maintain 4-circuit, 14-SOIC configuration. The J-FET topology may affect input impedance and frequency response characteristics; applications with specific input impedance requirements should evaluate this difference.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed in this reference are ROHS3 compliant. The LS404CD is also ROHS3 compliant. All parts carry REACH Unaffected status and ECCN EAR99 classification.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: MSL 1 indicates unlimited shelf life without moisture control requirements. MSL 3 (168 hours) requires moisture control during storage and handling. The LS404CD carries MSL 1. Most substitute parts carry MSL 1; AS324MTR-E1 carries MSL 3, requiring adherence to moisture control protocols during storage and assembly.

Q: Can the LM124DR substitute for the LS404CD in all applications?

A: The LM124DR is a general purpose 4-circuit amplifier in 14-SOIC packaging with active product status. However, the LM124DR features differential output configuration, whereas the LS404CD has standard single-ended outputs. Applications designed for single-ended operation require circuit redesign to accommodate differential outputs. Additionally, the maximum supply voltage is 30 V, limiting use in applications requiring the full 60 V capability of the LS404CD.

Q: What supply voltage range is common to all substitute parts?

A: The common supply voltage range across all substitute parts is 8 V to 30 V. The LS404CD specifies 8 V to 60 V. Applications requiring operation above 30 V supply voltage are limited to the LS404CD or must employ alternative design approaches.

Q: How do input bias current specifications affect substitution?

A: Input bias current determines the magnitude of current flowing into the amplifier inputs. The LS404CD specifies 100 nA maximum. All substitute parts meet or exceed this specification: TS514IDT (50 nA), AS324 series (20 nA), ADTL084ARZ series (2 pA), and LM124 series (20 nA). Lower input bias current reduces input offset current effects and is generally advantageous for high-impedance source applications.

Q: What is the difference between the ADTL084ARZ packaging variants?

A: ADTL084ARZ is supplied in Tube packaging. ADTL084ARZ-REEL is supplied in Tape & Reel (TR) format. ADTL084ARZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel® format. All three variants are electrically identical with identical electrical specifications. Packaging selection depends on assembly process requirements and inventory management practices.

Q: Are there inventory considerations for substitute part selection?

A: Inventory availability varies significantly among substitute parts. TS514IDT has 1,738 units in stock. AS324MTR-E1 has the highest inventory at 56,300 units. ADTL084ARZ-REEL7 has 44,200 units. LM124DR has 171,766 units in stock. Inventory levels should be considered in conjunction with electrical compatibility and supply chain strategy.

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