LM709CH Equivalent & Substitute Parts

Part Overview

The LM709CH is a general-purpose operational amplifier manufactured by Texas Instruments in a TO-99-8 metal can package. This device is classified as obsolete, indicating it is no longer in active production. The LM709CH operates across a supply voltage range of 18V to 30V and is designed for through-hole mounting applications. Due to its obsolete status, identifying equivalent and substitute parts is necessary for system redesign, legacy equipment maintenance, and procurement continuity.

Substiute Parts

LM709CH

Texas InstrumentsIn Stock: 1169LM709CH Datasheet

Current PartRFQ

AD549JHZ

Analog Devices Inc.In Stock: 8241AD549JHZ Datasheet

MFR RecommendedRFQ

JM38510/11405BGA

Analog Devices Inc.In Stock: 1435JM38510/11405BGA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM709CH is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the TO-99-8 metal can package with through-hole mounting to ensure physical and electrical compatibility with existing PCB layouts.

Supply Voltage Range: The LM709CH operates within 18V to 30V. Substitute parts must support this voltage range or a range that encompasses it. Parts with wider supply voltage ranges (such as 10V to 36V or 10V to 40V) are compatible as they include the required operating window.

Amplifier Classification: The LM709CH is a general-purpose operational amplifier. Substitute parts may include general-purpose amplifiers or specialized amplifier types (such as J-FET amplifiers) provided they maintain single-circuit configuration and TO-99-8 packaging.

Single Circuit Configuration: The LM709CH contains one amplifier circuit. Substitute parts must also contain exactly one circuit to maintain functional equivalence.

Electrical Performance Characteristics: While the LM709CH exhibits specific performance metrics (slew rate, input bias current, input offset voltage, and supply current), substitute parts with improved or equivalent performance characteristics are acceptable for substitution, provided they meet the package and voltage range requirements.

Parameter Comparison

Engineering Selection Recommendations

AD549JHZ Selection Criteria:

The AD549JHZ is an active-status general-purpose operational amplifier from Analog Devices Inc. It maintains identical package and mounting specifications (TO-99-8 metal can, through-hole) and operates within a supply voltage range of 10V to 36V, which encompasses the LM709CH requirement of 18V to 30V. The AD549JHZ demonstrates superior electrical performance with reduced input bias current (0.15 pA versus 300 nA) and improved slew rate (3 V/µs versus 0.25 V/µs). The device is ROHS3 compliant, addressing modern regulatory requirements. The AD549JHZ is suitable for applications requiring direct functional replacement with enhanced performance characteristics.

JM38510/11405BGA Selection Criteria:

The JM38510/11405BGA is an active-status J-FET operational amplifier from Analog Devices Inc. It maintains identical package and mounting specifications (TO-99-8 metal can, through-hole) and operates within a supply voltage range of 10V to 40V, which encompasses the LM709CH requirement. This device is qualified to MIL-M-38510/114 military specification and operates across an extended temperature range of -55°C to 125°C, compared to the LM709CH range of 0°C to 70°C. The JM38510/11405BGA exhibits superior slew rate (10 V/µs) and input bias current (100 pA). This device is ROHS3 compliant and is suitable for applications requiring military-grade qualification or extended temperature operation.

Compliance Considerations:

Both substitute parts are ROHS3 compliant, whereas the LM709CH is RoHS non-compliant. Selection of either substitute part addresses regulatory compliance requirements for new designs or equipment updates. Both substitute parts maintain REACH unaffected status and EAR99 ECCN classification, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the AD549JHZ directly replace the LM709CH in existing circuits?

A: The AD549JHZ is physically and electrically compatible with the LM709CH. Both devices use the TO-99-8 metal can package with through-hole mounting. The AD549JHZ operates within the LM709CH supply voltage range (18V to 30V falls within the AD549JHZ range of 10V to 36V). The AD549JHZ exhibits superior performance characteristics, including faster slew rate and lower input bias current. Direct substitution is supported by package compatibility and electrical parameter alignment.

Q: What is the primary difference between the AD549JHZ and JM38510/11405BGA?

A: The AD549JHZ is a general-purpose operational amplifier, while the JM38510/11405BGA is a J-FET operational amplifier. The JM38510/11405BGA is qualified to military specification MIL-M-38510/114 and operates across an extended temperature range (-55°C to 125°C versus 0°C to 70°C). The JM38510/11405BGA exhibits higher slew rate (10 V/µs versus 3 V/µs) and lower input bias current (100 pA versus 0.15 pA). Selection depends on application requirements for military qualification and temperature range.

Q: Are both substitute parts available in the same package as the LM709CH?

A: Yes. Both the AD549JHZ and JM38510/11405BGA are packaged in TO-99-8 metal can with through-hole mounting, identical to the LM709CH. This ensures compatibility with existing PCB layouts and socket configurations without requiring board redesign.

Q: Does the LM709CH supply voltage range limit substitute part selection?

A: No. The LM709CH operates within 18V to 30V. Both substitute parts support wider supply voltage ranges (AD549JHZ: 10V to 36V; JM38510/11405BGA: 10V to 40V) that fully encompass the LM709CH operating window. Wider supply ranges do not restrict substitution; they provide additional design flexibility.

Q: What is the significance of RoHS compliance status in substitute part selection?

A: The LM709CH is RoHS non-compliant, while both substitute parts (AD549JHZ and JM38510/11405BGA) are ROHS3 compliant. For new equipment designs or regulatory compliance requirements, ROHS3-compliant substitutes are necessary. For legacy equipment maintenance where RoHS compliance is not mandated, either substitute part is acceptable.

Q: Can the JM38510/11405BGA be used in applications with operating temperatures below 0°C?

A: Yes. The JM38510/11405BGA operates across -55°C to 125°C, which extends below the LM709CH range of 0°C to 70°C. Applications requiring operation at temperatures below 0°C must use the JM38510/11405BGA, as the AD549JHZ maintains the same 0°C to 70°C range as the original LM709CH.

Q: Are there performance trade-offs when substituting the LM709CH?

A: Both substitute parts demonstrate improved performance relative to the LM709CH. The AD549JHZ and JM38510/11405BGA exhibit faster slew rates and lower input bias currents. These improvements do not constitute trade-offs; they represent performance enhancements. Applications designed for LM709CH performance specifications will operate within the performance envelope of either substitute part.