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LM320H-5.0 Equivalent & Substitute Parts
Part Overview
The LM320H-5.0 is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed negative output of -5V at 500mA in a TO-39-3 metal can package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing system support. The LM320H-5.0 serves applications requiring stable negative voltage regulation with integrated over-current and over-temperature protection.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM320H-5.0 |
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Package / Case | TO-205AD, TO-39-3 Metal Can |
| Output Configuration | Negative |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | -5V |
| Current - Output | 500mA |
| Voltage - Input (Max) | -25V |
| Operating Temperature | 0°C ~ 125°C |
| Protection Features | Over Current, Over Temperature |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the LM320H-5.0 is determined by the following critical parameters:
- Negative Output Configuration: The substitute must provide negative voltage regulation
- Package Compatibility: TO-39-3 metal can package ensures mechanical and thermal compatibility
- Output Current Capability: Minimum 500mA required for direct replacement
- Input Voltage Range: Must accommodate the -25V maximum input specification
- Protection Features: Over-current and over-temperature protection required
- Compliance Standards: RoHS3 compliance and REACH unaffected status maintained
The LM137H/NOPB qualifies as a manufacturer-recommended substitute based on these parameters, despite differences in output type (adjustable vs. fixed) and current rating (1.5A vs. 500mA). The adjustable output can be configured to -5V, and the higher current rating provides design margin for the original 500mA requirement.
Parameter Comparison
| Parameter | LM320H-5.0 | LM137H/NOPB |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Category | Power Management (PMIC) | Power Management (PMIC) |
| Package / Case | TO-205AD, TO-39-3 Metal Can | TO-205AD, TO-39-3 Metal Can |
| Output Configuration | Negative | Negative |
| Output Type | Fixed (-5V) | Adjustable (-1.2V to -37V) |
| Current - Output | 500mA | 1.5A |
| Voltage - Input (Max) | -25V | -40V |
| PSRR (120Hz) | 64dB | 66dB |
| Protection Features | Over Current, Over Temperature | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | 0°C ~ 125°C | -55°C ~ 150°C |
| Product Status | Obsolete | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
The LM137H/NOPB is the manufacturer-recommended substitute for the obsolete LM320H-5.0. Selection is based on the following engineering criteria:
- Product Status: The LM137H/NOPB is active, ensuring long-term availability and supply chain continuity compared to the obsolete LM320H-5.0
- Compliance Alignment: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements
- Package Compatibility: Identical TO-39-3 metal can package enables direct mechanical substitution without PCB redesign
- Electrical Compatibility: The adjustable output of the LM137H/NOPB can be configured to the required -5V output, with external resistors determining the final voltage. The 1.5A output current exceeds the 500mA requirement, providing operational margin
- Enhanced Protection: The LM137H/NOPB includes short-circuit protection in addition to over-current and over-temperature protection
- Extended Temperature Range: Operating range of -55°C to 150°C exceeds the original 0°C to 125°C specification
Frequently Asked Questions (FAQ)
Q: Can the LM137H/NOPB directly replace the LM320H-5.0 without circuit modifications?
A: The LM137H/NOPB requires external resistors to set the output voltage to -5V, as it is an adjustable regulator. The LM320H-5.0 is a fixed -5V regulator. Direct pin-for-pin substitution is not possible without adding voltage-setting resistors to the feedback network.
Q: What is the difference between fixed and adjustable output types?
A: The LM320H-5.0 provides a fixed -5V output determined by internal circuitry. The LM137H/NOPB allows output voltage adjustment through external resistors connected to the feedback pin, enabling configuration of any voltage within its -1.2V to -37V range.
Q: Is the higher current rating of the LM137H/NOPB (1.5A vs. 500mA) a concern?
A: No. A higher current rating provides design margin and does not negatively affect operation at lower current levels. The device will deliver only the current required by the load.
Q: Are the packages identical?
A: Yes. Both devices use the TO-39-3 metal can package (TO-205AD), ensuring mechanical compatibility and identical thermal characteristics.
Q: Does the extended operating temperature range of the LM137H/NOPB affect compatibility?
A: No. The extended range (-55°C to 150°C) is a superset of the original specification (0°C to 125°C), ensuring compatibility across all original operating conditions.
Q: What compliance certifications apply to both devices?
A: Both the LM320H-5.0 and LM137H/NOPB are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.
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