LM318N Equivalent & Substitute Parts

Part Overview

The LM318N is a general-purpose operational amplifier manufactured by Texas Instruments in an 8-DIP through-hole package. This device is classified as obsolete, indicating discontinued production and limited availability for new designs. The LM318N operates across a supply voltage range of 10V to 40V with a slew rate of 70V/µs and gain bandwidth product of 15 MHz, making it suitable for general analog signal processing applications. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, maintenance, and component sourcing in legacy systems or when inventory depletion occurs.

Substiute Parts

LM318N

Texas InstrumentsIn Stock: 2560LM318N Datasheet

Current PartRFQ

LM318N/NOPB

Texas InstrumentsIn Stock: 4136LM318N/NOPB Datasheet

DirectRFQ

AD797ANZ

Analog Devices Inc.In Stock: 2472AD797ANZ Datasheet

MFR RecommendedRFQ

HA3-2525-5Z

Renesas Electronics CorporationIn Stock: 1613HA3-2525-5Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM318N is determined by compatibility across the following critical parameters: package type (8-DIP through-hole), amplifier classification (general purpose), number of circuits (1), and electrical operating ranges (supply voltage, temperature, and frequency response). The substitute parts identified maintain the same physical package footprint and mounting technology, ensuring direct board-level compatibility without layout modifications.

The substitution logic is based on:

• Package Compatibility: All substitute parts use 8-DIP (0.300", 7.62mm) through-hole packaging
• Functional Classification: All parts are single-circuit general-purpose operational amplifiers
• Supply Voltage Overlap: Substitute parts operate within or exceed the 10V to 40V supply range of the LM318N
• Frequency Response: Substitute parts maintain bandwidth characteristics suitable for general-purpose amplification
• Thermal Operating Range: Substitute parts cover or exceed the 0°C to 70°C operating temperature window

Parameter Comparison

Engineering Selection Recommendations

LM318N/NOPB (Texas Instruments, Active Status)

The LM318N/NOPB is the direct equivalent of the LM318N with identical electrical specifications and package configuration. This part is currently in active production status with higher inventory availability (4036 pcs) compared to the obsolete LM318N. The LM318N/NOPB achieves ROHS3 compliance, addressing regulatory requirements for new designs and manufacturing environments. This substitute is the primary choice for direct replacement in existing applications without circuit modification.

AD797ANZ (Analog Devices Inc., Active Status)

The AD797ANZ is a general-purpose operational amplifier in 8-DIP packaging with enhanced performance characteristics. This device features a significantly higher gain bandwidth product (110 MHz versus 15 MHz) and superior input offset voltage (25 µV versus 4 mV). The AD797ANZ operates within a reduced maximum supply voltage range (30V maximum versus 40V maximum) and requires higher supply current (8.2 mA versus 5 mA). This substitute is suitable for applications requiring improved frequency response and precision offset characteristics, provided the 30V maximum supply voltage constraint is acceptable. The extended operating temperature range (-40°C to 85°C) provides thermal flexibility beyond the LM318N specification.

HA3-2525-5Z (Renesas Electronics Corporation, Active Status)

The HA3-2525-5Z is a general-purpose operational amplifier in 8-DIP packaging with enhanced slew rate performance (120 V/µs versus 70 V/µs). This device maintains comparable gain bandwidth product (20 MHz versus 15 MHz) and operates with lower supply current (4 mA versus 5 mA). The HA3-2525-5Z supports an extended minimum supply voltage range (8V minimum versus 10V minimum) and operates across a maximum supply voltage of 36V. This substitute is appropriate for applications requiring faster signal transitions and lower power consumption, with the trade-off of slightly reduced maximum supply voltage capability.

All three substitute parts maintain through-hole 8-DIP package compatibility, ensuring direct board-level substitution without layout redesign. Selection among these alternatives depends on specific application requirements regarding frequency response, slew rate, supply voltage constraints, and regulatory compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can the LM318N/NOPB be used as a direct replacement for the LM318N in existing designs?

A: Yes. The LM318N/NOPB is electrically and mechanically identical to the LM318N, with identical slew rate (70 V/µs), gain bandwidth product (15 MHz), supply voltage range (10V to 40V), and operating temperature range (0°C to 70°C). The primary difference is active production status and ROHS3 compliance. No circuit modifications are required.

Q: What are the key differences between the AD797ANZ and the LM318N?

A: The AD797ANZ provides superior frequency response (110 MHz gain bandwidth product versus 15 MHz) and significantly lower input offset voltage (25 µV versus 4 mV). However, the AD797ANZ has a reduced maximum supply voltage (30V versus 40V) and higher supply current requirement (8.2 mA versus 5 mA). The AD797ANZ is suitable for precision and high-frequency applications where the 30V supply limit is acceptable.

Q: What are the key differences between the HA3-2525-5Z and the LM318N?

A: The HA3-2525-5Z features a higher slew rate (120 V/µs versus 70 V/µs) and lower supply current (4 mA versus 5 mA). The gain bandwidth product is slightly higher (20 MHz versus 15 MHz). The HA3-2525-5Z supports a lower minimum supply voltage (8V versus 10V) but has a reduced maximum supply voltage (36V versus 40V). This substitute is optimal for applications requiring fast signal transitions and minimal power consumption.

Q: Are all substitute parts available in the same 8-DIP through-hole package?

A: Yes. All substitute parts—LM318N/NOPB, AD797ANZ, and HA3-2525-5Z—are packaged in 8-DIP (0.300", 7.62mm) through-hole format, enabling direct board-level substitution without PCB layout modifications.

Q: Do the substitute parts meet modern regulatory compliance standards?

A: Yes. All three substitute parts (LM318N/NOPB, AD797ANZ, and HA3-2525-5Z) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for manufacturing and distribution in regulated markets.

Q: Which substitute part should be selected for applications requiring the widest supply voltage range?

A: The LM318N/NOPB maintains the original 10V to 40V supply voltage range of the LM318N. The HA3-2525-5Z supports 8V to 36V, and the AD797ANZ supports 10V to 30V. For applications requiring operation at 40V supply, only the LM318N/NOPB is suitable.

Q: Can the AD797ANZ be used in applications originally designed for the LM318N if the supply voltage is limited to 30V?

A: Yes, provided the application does not require the full 40V supply capability. The AD797ANZ offers superior frequency response and precision characteristics. Circuit performance should be verified to confirm that the enhanced bandwidth and lower offset voltage do not introduce unintended effects in the specific application context.

Q: What is the inventory status of each substitute part?

A: LM318N/NOPB has 4036 pcs in stock, AD797ANZ has 2410 pcs in stock, and HA3-2525-5Z has 1590 pcs in stock. The original LM318N has 2496 pcs in stock but is obsolete and not recommended for new designs.