LM109H/NOPB Equivalent & Substitute Parts

Part Overview

The LM109H/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed positive output of 5.05V at 200mA. This through-hole component operates across an input voltage range up to 25V and is rated for operating temperatures from -55°C to 150°C. The device is housed in a TO-39-3 metal can package and includes over-current and over-temperature protection features. As an active product with ROHS3 compliance, substitute parts may be required due to packaging preferences, inventory availability, or application-specific thermal and current requirements.

Substiute Parts

LM109H/NOPB

Texas InstrumentsIn Stock: 1427LM109H/NOPB Datasheet

Current PartRFQ

MC7805ABTG

onsemiIn Stock: 2140MC7805ABTG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM109H/NOPB is determined by the following critical parameters:

• Output Voltage: The substitute must provide a fixed positive output voltage compatible with 5.05V or 5V nominal specifications
• Output Current Capability: The substitute must support at least 200mA continuous output current
• Input Voltage Range: The substitute must accept input voltages up to 25V minimum
• Package Type: Substitutes may differ in package configuration (TO-39 vs. TO-220) based on application requirements
• Operating Temperature Range: The substitute must cover the required operating temperature window
• Protection Features: Over-temperature and over-current protection must be present
• Compliance: RoHS3 compliance is required for equivalent substitution

The MC7805ABTG qualifies as a substitute based on these parameters, though with notable differences in output current capability and package form factor.

Parameter Comparison

Engineering Selection Recommendations

Both the LM109H/NOPB and MC7805ABTG are active products with ROHS3 compliance and REACH unaffected status, making them suitable for equivalent substitution from a regulatory standpoint.

The MC7805ABTG provides higher output current capability (1A vs. 200mA) and accepts higher input voltages (35V vs. 25V), making it suitable for applications requiring greater current headroom. However, the operating temperature range of the MC7805ABTG (-40°C to 125°C) is narrower than the LM109H/NOPB (-55°C to 150°C), which may be a limiting factor in extreme temperature environments.

Package differences between TO-39-3 (metal can) and TO-220-3 (plastic tab) affect thermal dissipation characteristics and board layout requirements. The TO-220 package generally provides superior thermal performance due to its larger surface area and tab mounting capability.

Selection should be based on specific application requirements regarding output current, input voltage range, operating temperature extremes, and thermal management needs.

Frequently Asked Questions (FAQ)

Q: Can the MC7805ABTG directly replace the LM109H/NOPB in all applications?

A: Direct replacement depends on application-specific requirements. The MC7805ABTG has higher output current (1A vs. 200mA) and higher maximum input voltage (35V vs. 25V), which are advantageous. However, its narrower operating temperature range (-40°C to 125°C vs. -55°C to 150°C) may not be suitable for extreme temperature applications. Package differences (TO-220 vs. TO-39) require PCB layout modifications.

Q: What is the voltage output difference between 5.05V and 5V?

A: The LM109H/NOPB outputs 5.05V while the MC7805ABTG outputs 5V. This 50mV difference is within typical tolerance ranges for 5V regulated supplies and should not affect most applications designed for standard 5V logic and power distribution.

Q: How do the package types affect thermal performance?

A: The TO-39-3 metal can package has limited thermal dissipation capability due to its small form factor. The TO-220-3 package includes a metal tab for direct mounting to a heatsink, providing significantly better thermal management for higher current applications. For the LM109H/NOPB at 200mA, thermal considerations are minimal; the MC7805ABTG at 1A may benefit from heatsinking depending on input-output voltage differential and ambient temperature.

Q: Are both parts RoHS compliant?

A: Yes, both the LM109H/NOPB and MC7805ABTG are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What protection features does each regulator provide?

A: The LM109H/NOPB includes over-current and over-temperature protection. The MC7805ABTG includes over-temperature and short-circuit protection. Both provide essential safeguards against fault conditions, though the specific protection mechanisms differ slightly.