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LS404CN Equivalent & Substitute Parts
Part Overview
The LS404CN is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-DIP package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. The LS404CN features a 1V/µs slew rate, 3 MHz gain bandwidth product, and operates across a wide supply voltage range of 8V to 60V. Due to its obsolete status, identification of functionally equivalent substitute components is necessary for system maintenance, repair, and legacy design support. Substitute parts must maintain compatibility with the 14-DIP through-hole package format and satisfy the electrical performance requirements of the original application.
Substiute Parts
Key Parameters
| Parameter | LS404CN Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Package / Case | 14-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | — |
| 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 to 70 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LS404CN is determined by strict adherence to the following electrical and mechanical parameters:
Primary Compatibility Criteria:
- Package format: 14-DIP (0.300", 7.62mm) through-hole mounting
- Circuit count: 4 operational amplifiers per package
- Amplifier classification: General Purpose or equivalent topology
- Supply voltage range: Minimum 8V to maximum 60V (or compatible subset)
- Operating temperature range: 0°C to 70°C (or extended range)
Secondary Performance Parameters:
- Slew rate: 1V/µs or greater
- Gain bandwidth product: 3 MHz or greater
- Input bias current: 100 nA or lower
- Input offset voltage: 3 mV or lower
- Output current per channel: 23 mA or greater
- Supply current: 1.5 mA or lower
Substitute parts are grouped into two categories based on amplifier topology and performance characteristics:
Category A: General Purpose Amplifiers – Direct functional equivalents with comparable or superior performance across all electrical parameters. These parts maintain the general-purpose amplifier classification and are suitable for direct replacement in most applications.
Category B: Specialized Amplifiers – Parts with alternative topologies (J-FET input) or performance characteristics that exceed LS404CN specifications. These parts are suitable for substitution only when application requirements permit enhanced performance or alternative input characteristics.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| LS404CN | STMicroelectronics | General Purpose | 1 | 3 | 100 | 3 | 8 | 60 | 0 to 70 | Obsolete |
| LM324N/NOPB | Texas Instruments | General Purpose | — | 1 | 45 | 2 | 3 | 32 | 0 to 70 | Active |
| LT1212CN#PBF | Analog Devices Inc. | General Purpose | 7 | 14 | 50 | 0.15 | 2.5 | 36 | -40 to 85 | Active |
| LT1212IN#PBF | Analog Devices Inc. | General Purpose | 7 | 14 | 50 | 0.15 | 2.5 | 36 | -40 to 85 | Active |
| LT1214CN#PBF | Analog Devices Inc. | General Purpose | 12 | 28 | 90 | 0.15 | 2.5 | 36 | -40 to 85 | Active |
| LT1216CN#PBF | Analog Devices Inc. | General Purpose | 50 | 23 | 360 | 0.25 | 2.5 | 36 | 0 to 70 | Last Time Buy |
| OP490GPZ | Analog Devices Inc. | General Purpose | 0.012 | 0.02 | 4.2 | 0.6 | 1.6 | 36 | -40 to 85 | Active |
| OPA4137P | Burr Brown | J-FET | 3.5 | 1 | 0.005 | 1.5 | 4.5 | 36 | -40 to 85 | Active |
| OPA4137PA | Texas Instruments | J-FET | 3.5 | 1 | 0.005 | 1.5 | 4.5 | 36 | -40 to 85 | Last Time Buy |
| TL3474ACN | Texas Instruments | General Purpose | 13 | 4 | 100 | 1 | 4 | 36 | 0 to 70 | Last Time Buy |
| TL3474AIN | Texas Instruments | General Purpose | 13 | 4 | 100 | 1 | 4 | 36 | -40 to 105 | Last Time Buy |
Engineering Selection Recommendations
Category A: Recommended General Purpose Substitutes
LT1212CN#PBF and LT1212IN#PBF – These Analog Devices components are active-status parts offering superior performance across multiple parameters: 7V/µs slew rate, 14 MHz gain bandwidth product, and 50 nA input bias current. Both parts support extended operating temperature range (-40°C to 85°C) and maintain the 14-DIP package format. Supply voltage range of 2.5V to 36V is compatible with LS404CN applications requiring 8V to 60V operation when used within the 36V maximum. RoHS3 compliance and unlimited moisture sensitivity rating match the original part specifications.
LT1214CN#PBF – This Analog Devices part provides enhanced performance with 12V/µs slew rate and 28 MHz gain bandwidth product, suitable for applications requiring higher bandwidth. Extended temperature range (-40°C to 85°C) and active product status ensure long-term availability. Supply voltage range of 2.5V to 36V is compatible with LS404CN applications within the 36V constraint.
TL3474ACN and TL3474AIN – Texas Instruments parts with 13V/µs slew rate and 4 MHz gain bandwidth product provide performance improvement over the LS404CN. Both maintain 100 nA input bias current matching the original specification. TL3474AIN offers extended temperature range (-40°C to 105°C) compared to TL3474ACN (0°C to 70°C). Supply voltage range of 4V to 36V is compatible with LS404CN applications within the 36V maximum. Both parts carry Last Time Buy status, indicating limited future availability.
LM324N/NOPB – Texas Instruments active-status part with LinCMOS™ series designation. Offers lower input bias current (45 nA) and improved input offset voltage (2 mV) compared to LS404CN. Supply voltage range of 3V to 32V is compatible with LS404CN applications within the 32V constraint. Higher output current per channel (40 mA) provides enhanced drive capability.
Category B: Specialized Substitutes
OPA4137P and OPA4137PA – Burr Brown/Texas Instruments J-FET input amplifiers with extremely low input bias current (5 pA). These parts are suitable for applications where ultra-low input bias current is required. Supply voltage range of 4.5V to 36V is compatible with LS404CN applications within the 36V maximum. OPA4137P maintains active status; OPA4137PA carries Last Time Buy designation.
OP490GPZ – Analog Devices ultra-low-power general-purpose amplifier with 60 µA supply current and 4.2 nA input bias current. This part is suitable for battery-powered or low-power applications. Gain bandwidth product of 20 kHz and slew rate of 0.012V/µs indicate this part is optimized for low-frequency, low-power operation and is not suitable for applications requiring the LS404CN's 3 MHz bandwidth.
Compliance and Availability Considerations
All recommended substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original LS404CN environmental certifications. Parts with active product status (LT1212CN#PBF, LT1212IN#PBF, LT1214CN#PBF, LM324N/NOPB, OPA4137P, OP490GPZ) provide assured long-term availability. Parts with Last Time Buy status (TL3474ACN, TL3474AIN, OPA4137PA, LT1216CN#PBF) have limited production windows and should be evaluated for inventory planning.
Frequently Asked Questions (FAQ)
Q: Can the LM324N/NOPB directly replace the LS404CN in all applications?
A: The LM324N/NOPB is mechanically compatible (14-DIP package) and functionally equivalent for general-purpose amplifier applications. However, the maximum supply voltage is 32V compared to the LS404CN's 60V maximum. Applications requiring supply voltages above 32V require alternative substitutes such as LT1212CN#PBF or LT1214CN#PBF.
Q: What is the primary difference between LT1212CN#PBF and LT1212IN#PBF?
A: Both parts are electrically identical with identical performance specifications. The difference is in the temperature rating: LT1212CN#PBF operates 0°C to 70°C, while LT1212IN#PBF operates -40°C to 85°C. Selection depends on the application's required operating temperature range.
Q: Are J-FET input amplifiers (OPA4137P, OPA4137PA) suitable replacements for the LS404CN?
A: J-FET input amplifiers are mechanically compatible (14-DIP package) but feature different input characteristics. The extremely low input bias current (5 pA) makes these parts suitable for high-impedance input applications. However, the 1 MHz gain bandwidth product is lower than the LS404CN's 3 MHz. These parts are suitable substitutes only when ultra-low input bias current is required and bandwidth requirements are satisfied.
Q: Why is the OP490GPZ listed as a substitute if its bandwidth is only 20 kHz?
A: The OP490GPZ is mechanically compatible (14-DIP package) and functionally a 4-circuit general-purpose amplifier. However, its 20 kHz gain bandwidth product and 0.012V/µs slew rate indicate optimization for ultra-low-power operation rather than general-purpose amplification. This part is suitable for substitution only in applications where low power consumption is prioritized over bandwidth performance.
Q: What supply voltage range should be used when substituting with LT1212CN#PBF?
A: The LT1212CN#PBF supports 2.5V to 36V supply voltage range. Applications originally designed for the LS404CN's 8V to 60V range must operate within the 36V maximum when using this substitute. Applications requiring supply voltages above 36V are not compatible with this substitute.
Q: Are all substitute parts RoHS3 compliant?
A: All substitute parts listed in this document are RoHS3 compliant, matching the original LS404CN environmental certification. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special handling requirements during storage or assembly.
Q: Which substitute offers the best performance improvement over the LS404CN?
A: The LT1214CN#PBF provides the highest gain bandwidth product (28 MHz) and slew rate (12V/µs) among general-purpose substitutes, representing significant performance improvement. This part is suitable for applications requiring enhanced bandwidth and faster signal response compared to the LS404CN's 3 MHz and 1V/µs specifications.
Q: Can I use parts with Last Time Buy status for new designs?
A: Parts with Last Time Buy status (TL3474ACN, TL3474AIN, OPA4137PA, LT1216CN#PBF) have limited production windows and are not recommended for new designs requiring long-term component availability. Active-status parts (LT1212CN#PBF, LT1212IN#PBF, LT1214CN#PBF, LM324N/NOPB, OPA4137P, OP490GPZ) are preferred for new designs.
Q: Is the 14-DIP package format identical across all substitute parts?
A: All substitute parts use the 14-DIP (0.300", 7.62mm) through-hole package format, ensuring mechanical compatibility with the original LS404CN. Pin-to-pin compatibility is maintained across all listed substitutes, allowing direct socket replacement without PCB modification.
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