LM318M Equivalent & Substitute Parts

Part Overview

The LM318M is a general-purpose operational amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory (5605 pcs). The LM318M operates across a 10V to 40V supply range with a slew rate of 70V/µs and 15 MHz gain bandwidth product, suitable for general-purpose amplification applications requiring moderate speed and precision.

Substitute parts are necessary due to the Last Time Buy status of the LM318M. Alternative devices with identical or superior electrical characteristics and compatible 8-SOIC packaging enable continued design support and long-term supply chain reliability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	70	V/µs
Gain Bandwidth Product	15	MHz
-3dB Bandwidth	15	MHz
Current - Input Bias	150	nA
Voltage - Input Offset	4	mV
Current - Supply	5	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	40	V
Operating Temperature	0 to 70	°C
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution logic for the LM318M is based on strict electrical and mechanical compatibility within the 8-SOIC package format. Substitute parts are grouped into two categories:

Category 1: Direct Packaging Variants (Texas Instruments LM318 Series) These parts share identical electrical specifications with the LM318M base device. Substitution is determined by packaging format (Tube vs. Cut Tape & Digi-Reel) and product status (Active vs. Last Time Buy). All LM318 variants maintain:

Slew Rate: 70V/µs
Gain Bandwidth Product: 15 MHz
Supply Voltage Range: 10V to 40V
Input Bias Current: 150 nA
Input Offset Voltage: 4 mV
Operating Temperature: 0°C to 70°C

Category 2: Enhanced Performance Alternatives (Analog Devices AD797 Series & onsemi LM201 Series) These parts operate within the same 8-SOIC package and supply voltage envelope (10V minimum, 30V to 44V maximum) but exhibit different electrical characteristics. Substitution requires verification that application requirements do not mandate the specific slew rate or bandwidth of the LM318M. The AD797 series provides superior gain bandwidth product (110 MHz) and lower input offset voltage (10 to 25 µV), while the LM201 series provides lower supply current (1.8 mA) and lower input bias current (25 to 30 nA) at the cost of reduced slew rate (0.5V/µs) and bandwidth (1 MHz).

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV/µV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Packaging
LM318M	Texas Instruments	Last Time Buy	70	15	150	4 mV	5	10	40	0 to 70	8-SOIC
LM318M/NOPB	Texas Instruments	Active	70	15	150	4 mV	5	10	40	0 to 70	8-SOIC (Tube)
LM318MX/NOPB	Texas Instruments	Active	70	15	150	4 mV	5	10	40	0 to 70	8-SOIC (CT & Digi-Reel)
AD797ARZ	Analog Devices Inc.	Active	20	110	250	25 µV	8.2	10	30	-40 to 85	8-SOIC (Tube)
AD797ARZ-REEL	Analog Devices Inc.	Active	20	110	250	25 µV	8.2	10	30	-40 to 85	8-SOIC (TR)
AD797ARZ-REEL7	Analog Devices Inc.	Active	20	110	250	25 µV	8.2	10	30	-40 to 85	8-SOIC (CT & Digi-Reel)
AD797BRZ	Analog Devices Inc.	Active	20	110	250	10 µV	8.2	10	30	-40 to 85	8-SOIC (Tube)
AD797BRZ-REEL	Analog Devices Inc.	Active	20	110	250	10 µV	8.2	10	30	-40 to 85	8-SOIC
AD797BRZ-REEL7	Analog Devices Inc.	Active	20	110	250	10 µV	8.2	10	30	-40 to 85	8-SOIC (CT & Digi-Reel)
LM201ADR2G	onsemi	Active	0.5	1	30	700 µV	1.8	10	44	-25 to 85	8-SOIC (TR)
LM201ADT	STMicroelectronics	Active	0.5	1	25	700 µV	1.8	10	44	-40 to 105	8-SOIC (CT & Digi-Reel)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select LM318M/NOPB or LM318MX/NOPB when the application requires exact electrical equivalence to the original LM318M specification. Both parts are Active status devices manufactured by Texas Instruments with ROHS3 compliance and MSL 1 rating. LM318MX/NOPB offers the highest inventory availability (12,568 pcs) in Cut Tape & Digi-Reel packaging, suitable for automated assembly. LM318M/NOPB is available in Tube packaging (1,300 pcs) for manual or lower-volume assembly processes.

For Enhanced Bandwidth Applications:

The AD797 series (AD797ARZ, AD797ARZ-REEL, AD797ARZ-REEL7, AD797BRZ, AD797BRZ-REEL, AD797BRZ-REEL7) provides 110 MHz gain bandwidth product compared to the LM318M's 15 MHz. These devices are suitable for applications requiring higher frequency response. The AD797B variants (AD797BRZ, AD797BRZ-REEL7) offer superior input offset voltage (10 µV) compared to AD797A variants (25 µV). All AD797 devices operate within the 10V to 30V supply range and are Active status with ROHS3 compliance. Maximum inventory is available in AD797ARZ-REEL format (889,288 pcs).

For Low-Power Supply Current Applications:

The LM201 series (LM201ADR2G, LM201ADT) reduces supply current to 1.8 mA compared to the LM318M's 5 mA. These devices are suitable for battery-powered or power-constrained applications. LM201ADT (STMicroelectronics) provides the highest inventory (271,704 pcs) and extended operating temperature range (-40°C to 105°C). However, the LM201 series operates at reduced slew rate (0.5V/µs) and bandwidth (1 MHz), limiting use to low-frequency signal conditioning.

All substitute parts maintain 8-SOIC package compatibility, ROHS3 compliance, and MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q1: Can LM318M/NOPB directly replace LM318M in existing designs?

Yes. LM318M/NOPB is electrically identical to LM318M with all specifications matching exactly. The difference is packaging format (Tube vs. unspecified in original). Both are 8-SOIC surface mount devices with identical pin configuration, electrical performance, and operating characteristics. Substitution requires no circuit modification.

Q2: What is the primary difference between LM318MX/NOPB and LM318M/NOPB?

Both devices are electrically identical. The difference is packaging format: LM318MX/NOPB uses Cut Tape & Digi-Reel packaging suitable for automated pick-and-place assembly, while LM318M/NOPB uses Tube packaging for manual handling. LM318MX/NOPB offers significantly higher inventory (12,568 pcs vs. 1,300 pcs).

Q3: Can AD797 series parts replace LM318M in all applications?

No. While AD797 devices share the same 8-SOIC package and 10V minimum supply voltage, they have different electrical characteristics. The AD797 series provides higher gain bandwidth product (110 MHz vs. 15 MHz) and lower input offset voltage (10-25 µV vs. 4 mV), but operates at lower maximum supply voltage (30V vs. 40V) and higher supply current (8.2 mA vs. 5 mA). Substitution is valid only for applications where the LM318M's specific slew rate (70V/µs) and bandwidth (15 MHz) are not required.

Q4: What are the key differences between AD797A and AD797B variants?

The AD797A series (AD797ARZ, AD797ARZ-REEL, AD797ARZ-REEL7) specifies input offset voltage of 25 µV. The AD797B series (AD797BRZ, AD797BRZ-REEL, AD797BRZ-REEL7) specifies input offset voltage of 10 µV, providing superior precision. All other electrical parameters are identical. Selection depends on application offset voltage tolerance requirements.

Q5: Can LM201 series parts replace LM318M?

LM201 series substitution is limited to applications where reduced supply current (1.8 mA vs. 5 mA) is prioritized over bandwidth. The LM201 series operates at significantly reduced slew rate (0.5V/µs vs. 70V/µs) and bandwidth (1 MHz vs. 15 MHz). Substitution is valid only for low-frequency signal conditioning, precision measurement, or power-constrained applications. High-speed or transient-response-sensitive circuits cannot use LM201 devices.

Q6: What packaging formats are available for LM318M substitutes?

Three packaging formats are available: Tube (manual assembly), Tape & Reel (TR) (automated assembly, standard reel), and Cut Tape & Digi-Reel (CT & Digi-Reel) (automated assembly, Digi-Reel compatible). All formats use identical 8-SOIC (0.154", 3.90mm Width) case dimensions and pin configuration. Selection depends on assembly process requirements.

Q7: Are all substitute parts ROHS3 compliant?

Yes. All substitute parts listed (LM318M/NOPB, LM318MX/NOPB, AD797 series, LM201 series) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. All parts are suitable for lead-free assembly processes.

Q8: What is the operating temperature range difference between LM318M and substitutes?

LM318M operates 0°C to 70°C. AD797 series extends to -40°C to 85°C. LM201ADT extends to -40°C to 105°C. For applications requiring operation below 0°C or above 70°C, AD797 or LM201ADT devices are required. For standard 0°C to 70°C operation, all devices are compatible.

Q9: Which substitute offers the highest inventory availability?

AD797ARZ-REEL (Analog Devices Inc.) offers the highest inventory at 889,288 pcs in Tape & Reel packaging. For Texas Instruments LM318 direct equivalents, LM318MX/NOPB offers 12,568 pcs in Cut Tape & Digi-Reel format. For onsemi/STMicroelectronics alternatives, LM201ADT offers 271,704 pcs.

Q10: Can multiple substitute parts be mixed in the same design?

Yes, provided all parts operate within the same supply voltage range and the application does not require matched electrical characteristics across multiple amplifier stages. For precision applications requiring matched offset voltage or bias current, use parts from the same manufacturer and variant (e.g., all AD797BRZ or all LM201ADT). Mixing LM318M with AD797 or LM201 devices in the same circuit is valid only when each amplifier stage has independent performance requirements.

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