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LS404CDT Equivalent & Substitute Parts
Part Overview
The LS404CDT 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 availability of 2,776 pieces in new original stock provides a limited supply window for applications currently utilizing this device. Identifying equivalent and substitute parts is necessary for design continuity, long-term product support, and supply chain resilience when original inventory becomes depleted.
Substiute Parts
Key Parameters
| Parameter | LS404CDT Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Part Number | LS404CDT |
| 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 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 |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LS404CDT is determined by strict alignment of electrical and mechanical parameters within the general purpose operational amplifier category. The critical substitution criteria are:
Mechanical Compatibility: All substitute parts must use the 14-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility without layout redesign.
Functional Equivalence: Substitute parts must provide 4 independent amplifier circuits within a single integrated circuit package, maintaining the quad-amplifier architecture.
Electrical Operating Range: The substitute part must support the voltage supply span requirements. The LS404CDT operates from 8 V to 60 V; substitute parts with lower maximum supply voltage ratings (such as 30 V or 36 V) are acceptable only if the application does not require operation above the substitute's maximum rating.
Performance Parameters: Slew rate, gain bandwidth product, input bias current, input offset voltage, and output current per channel define the signal processing capability. Substitute parts with equal or superior performance in these parameters maintain functional equivalence.
Temperature Operating Range: The LS404CDT operates from 0°C to 70°C. Substitute parts with extended temperature ranges (such as -40°C to 125°C) provide enhanced operational flexibility and are suitable for applications with broader environmental requirements.
Compliance & Regulatory Status: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to ensure regulatory alignment with the original component.
Parameter Comparison
| Parameter | LS404CDT | TS514IDT | ADTL084ARZ | AS324MTR-E1 | LM124DR |
|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | STMicroelectronics | Analog Devices Inc. | Diodes Incorporated | Texas Instruments |
| 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 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| 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 |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Equivalent - TS514IDT (STMicroelectronics)
The TS514IDT is the primary direct substitute for the LS404CDT. Both devices are manufactured by STMicroelectronics, share identical package geometry (14-SOIC), and maintain the same quad general purpose amplifier architecture. The TS514IDT is in active production status, ensuring long-term availability and supply continuity. Key advantages include improved input bias current (50 nA versus 100 nA), superior input offset voltage (500 µV versus 3 mV), and reduced supply current (500 µA versus 1.5 mA). The TS514IDT operates across an extended temperature range (-40°C to 125°C) compared to the LS404CDT (0°C to 70°C), providing enhanced environmental flexibility. The maximum supply voltage of 30 V is lower than the LS404CDT's 60 V maximum; applications requiring operation above 30 V require evaluation against actual circuit requirements. Both devices maintain ROHS3 compliance and MSL 1 rating.
Alternative Substitute - LM124DR (Texas Instruments)
The LM124DR is an active production general purpose quad amplifier in 14-SOIC package from Texas Instruments. This device provides the widest operating temperature range (-55°C to 125°C) among available substitutes, supporting demanding environmental applications. The LM124DR maintains full ROHS3 compliance and MSL 1 rating. The maximum supply voltage is 30 V, identical to the TS514IDT. The slew rate (0.5 V/µs) and gain bandwidth product (1.2 MHz) are lower than the LS404CDT, making this substitute suitable for applications where signal bandwidth requirements do not exceed 1.2 MHz. Output current per channel (30 mA) exceeds the LS404CDT specification (23 mA), providing additional drive capability. This device is recommended for applications prioritizing extended temperature operation and long-term production availability.
Alternative Substitute - AS324MTR-E1 (Diodes Incorporated)
The AS324MTR-E1 is an active production general purpose quad amplifier in 14-SOIC package from Diodes Incorporated. This device offers the lowest minimum supply voltage (3 V) among available substitutes, enabling operation in low-voltage applications. The maximum output current per channel (40 mA) is the highest among all substitutes, providing superior drive capability. The operating temperature range (-40°C to 85°C) is narrower than the LS404CDT but suitable for most industrial applications. The AS324MTR-E1 maintains ROHS3 compliance; however, the moisture sensitivity level is MSL 3 (168 hours), requiring controlled storage conditions compared to the LS404CDT's MSL 1 (unlimited). The maximum supply voltage is 36 V, exceeding the TS514IDT and LM124DR but remaining below the LS404CDT's 60 V maximum. This device is recommended for low-voltage applications requiring high output current capability.
Specialized Substitute - ADTL084ARZ-REEL7 (Analog Devices Inc.)
The ADTL084ARZ-REEL7 is an active production J-FET input quad amplifier in 14-SOIC package from Analog Devices Inc. This device differs from the LS404CDT in amplifier topology (J-FET versus general purpose bipolar), resulting in significantly superior input bias current (2 pA versus 100 nA) and slew rate (20 V/µs versus 1 V/µs). The gain bandwidth product (5 MHz) exceeds the LS404CDT specification. The ADTL084ARZ-REEL7 is suitable for applications requiring extremely low input bias current or high-speed signal processing. The maximum supply voltage is 36 V, lower than the LS404CDT's 60 V maximum. The operating temperature range (-40°C to 125°C) provides extended environmental coverage. This device maintains ROHS3 compliance and MSL 1 rating. Substitution requires verification that the J-FET input characteristics are compatible with the application circuit design.
Frequently Asked Questions (FAQ)
Q: Can the TS514IDT directly replace the LS404CDT without PCB modifications?
A: Yes. Both devices use the 14-SOIC (0.154", 3.90mm Width) surface mount package with identical pin assignments for quad general purpose amplifiers. Direct PCB footprint compatibility is maintained. However, circuit performance may differ due to improved electrical characteristics in the TS514IDT (lower input bias current, lower input offset voltage, reduced supply current). Functional verification is recommended for applications with tight performance specifications.
Q: What is the significance of the maximum supply voltage difference between the LS404CDT (60 V) and substitute parts (30-36 V)?
A: The LS404CDT supports operation up to 60 V supply voltage, while most substitute parts (TS514IDT, LM124DR, AS324MTR-E1) are limited to 30-36 V maximum. If the application circuit operates above 36 V, the LS404CDT cannot be substituted with these devices. Applications operating at 30 V or below can safely use substitute parts. The ADTL084ARZ-REEL7 supports 36 V maximum. Circuit design review is necessary to confirm actual supply voltage requirements.
Q: Why does the ADTL084ARZ-REEL7 have different electrical characteristics than other substitutes?
A: The ADTL084ARZ-REEL7 uses J-FET input technology, whereas the LS404CDT and most other substitutes use bipolar input technology. J-FET inputs provide extremely low input bias current (2 pA versus 100 nA) and high input impedance, making this device suitable for applications requiring minimal input loading. The trade-off is higher input offset voltage temperature drift and different frequency response characteristics. Substitution requires confirmation that J-FET input characteristics are compatible with the application circuit.
Q: What is the impact of the LS404CDT's obsolete status?
A: The LS404CDT is no longer manufactured by STMicroelectronics. The 2,776 pieces in current inventory represent a finite supply that will eventually deplete. Applications currently using the LS404CDT should transition to an active production substitute to ensure long-term component availability and supply chain continuity. The TS514IDT, LM124DR, and AS324MTR-E1 are all in active production status, guaranteeing availability for future production runs.
Q: How does the operating temperature range affect substitute selection?
A: The LS404CDT operates from 0°C to 70°C. Substitute parts offer extended ranges: TS514IDT (-40°C to 125°C), LM124DR (-55°C to 125°C), AS324MTR-E1 (-40°C to 85°C), and ADTL084ARZ-REEL7 (-40°C to 125°C). Applications operating within the LS404CDT's original range (0°C to 70°C) can use any substitute. Applications requiring operation below 0°C or above 70°C must select substitutes with appropriate extended temperature ratings. Extended temperature operation may require additional thermal management considerations in circuit design.
Q: What is the significance of MSL (Moisture Sensitivity Level) differences?
A: The LS404CDT has MSL 1 (unlimited shelf life without moisture control). The AS324MTR-E1 has MSL 3 (168-hour shelf life with moisture control). MSL 1 devices can be stored indefinitely in standard conditions. MSL 3 devices require controlled humidity storage and have a limited shelf life after moisture barrier bag opening. For applications with extended inventory holding periods or variable storage conditions, MSL 1 devices (TS514IDT, LM124DR, ADTL084ARZ-REEL7) are preferred over MSL 3 devices.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed (TS514IDT, ADTL084ARZ-REEL7, AS324MTR-E1, LM124DR) maintain ROHS3 compliance, matching the LS404CDT's regulatory status. All devices are REACH unaffected. No regulatory compliance issues arise from substitution.
Q: Which substitute provides the best overall compatibility with the LS404CDT?
A: The TS514IDT provides the closest electrical and operational compatibility. Both devices are manufactured by STMicroelectronics, share identical package geometry, and maintain the same general purpose amplifier architecture. The TS514IDT is in active production, ensuring long-term availability. Electrical improvements (lower input bias current, lower input offset voltage, reduced supply current) enhance performance without compromising compatibility. The primary limitation is the reduced maximum supply voltage (30 V versus 60 V), which requires verification against application requirements.
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