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KA7805AE Linear Voltage Regulator IC Equivalent & Substitute Parts
Part Overview
The KA7805AE is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 1A current capacity in a TO-220-3 package. This device is classified as obsolete, which necessitates identification of functionally equivalent and actively produced alternatives for new designs and ongoing production requirements. The KA7805AE delivers regulated 5V output from input voltages up to 35V with integrated over-temperature and short-circuit protection.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Output Voltage (Fixed) | 5V |
| Output Current | 1A |
| Input Voltage (Max) | 35V |
| Voltage Dropout (Max) | 2V @ 1A (Typ) |
| Quiescent Current (Iq) | 6 mA |
| PSRR | 68dB (120Hz) |
| Protection Features | Over Temperature, Short Circuit |
| Operating Temperature | 0°C ~ 125°C |
| Package / Case | TO-220-3 |
| Mounting Type | Through Hole |
Substitute Part Grouping Explanation
Substitute parts for the KA7805AE are grouped based on the following critical parameters that determine functional equivalence:
- Output Voltage: Must be fixed at 5V
- Output Current Capacity: Minimum 1A (higher ratings are acceptable)
- Input Voltage Rating: Maximum 35V or higher
- Package Type: TO-220-3 form factor for mechanical and thermal compatibility
- Protection Features: Over-temperature and short-circuit protection required
- Output Configuration: Positive fixed output only
Parts are further categorized by product status (Active vs. Obsolete) and operating temperature range. Parts with extended temperature ranges (-40°C to 125°C) provide broader application flexibility compared to the standard 0°C to 125°C range.
Parameter Comparison
| Part Number | Manufacturer | Output Current | Iq (mA) | PSRR (dB) | Operating Temp (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|
| KA7805AE | onsemi | 1A | 6 | 68 | 0 ~ 125 | Obsolete | Not Specified |
| MC7805ACTG | onsemi | 1A | 6 | 83 | 0 ~ 125 | Active | ROHS3 Compliant |
| MC7805BTG | onsemi | 1A | 8 | 68 | -40 ~ 125 | Active | ROHS3 Compliant |
| MC7805CTG | onsemi | 1A | 6.5 | 83 | 0 ~ 125 | Active | ROHS3 Compliant |
| NCV7805BTG | onsemi | 1A | 8 | 83 | -40 ~ 125 | Obsolete | ROHS3 Compliant |
| L7805ABV | STMicroelectronics | 1.5A | 6 | 68 | -40 ~ 125 | Active | ROHS3 Compliant |
| L7805ACV | STMicroelectronics | 1.5A | 6 | 68 | 0 ~ 125 | Active | ROHS3 Compliant |
| L7805CV | UMW | 1.2A | 6 | Not Specified | -40 ~ 105 | Active | ROHS3 Compliant |
| MC78M05ACTG | onsemi | 500mA | Not Specified | 80 | 0 ~ 125 | Obsolete | ROHS3 Compliant |
| MC78M05BTG | onsemi | 500mA | Not Specified | 80 | -40 ~ 125 | Active | ROHS3 Compliant |
| MC78M05CTG | onsemi | 500mA | Not Specified | 80 | 0 ~ 125 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (1A Output Current, Active Status)
MC7805ACTG, MC7805BTG, and MC7805CTG are direct onsemi replacements with identical 1A output current and TO-220-3 packaging. MC7805BTG and MC7805CTG are recommended for new designs due to active product status and ROHS3 compliance. MC7805BTG extends the operating temperature range to -40°C to 125°C, suitable for industrial and automotive applications. MC7805CTG maintains the standard 0°C to 125°C range with improved PSRR (83dB vs. 68dB).
L7805ABV and L7805ACV from STMicroelectronics provide 1.5A output current capacity, exceeding the KA7805AE specification. Both are ROHS3 compliant and active. L7805ABV supports -40°C to 125°C operation; L7805ACV operates 0°C to 125°C. Higher current capacity provides design margin for applications approaching 1A limits.
L7805CV from UMW delivers 1.2A output current with active status and ROHS3 compliance. Operating range extends to -40°C to 105°C, with the upper temperature limit 20°C below standard specifications.
Secondary Substitutes (500mA Output Current)
MC78M05BTG and MC78M05CTG are 500mA variants suitable only for applications with reduced current requirements. MC78M05BTG supports -40°C to 125°C; MC78M05CTG operates 0°C to 125°C. Both are active and ROHS3 compliant.
Automotive-Grade Alternative
NCV7805BTG is an automotive-qualified variant (AEC-Q100) with 1A output, -40°C to 125°C operation, and 83dB PSRR. Product status is obsolete; use only if automotive qualification is mandatory and availability permits.
Frequently Asked Questions (FAQ)
Q: Can MC7805BTG directly replace KA7805AE in existing designs?
A: Yes. MC7805BTG provides identical 1A output current, 5V fixed output, and TO-220-3 package. The extended operating temperature range (-40°C to 125°C vs. 0°C to 125°C) and active product status make it a suitable direct replacement. Pin configuration and electrical characteristics are compatible.
Q: What is the difference between MC7805ACTG, MC7805BTG, and MC7805CTG?
A: All three deliver 1A output at 5V in TO-220-3 packages. MC7805ACTG and MC7805CTG operate 0°C to 125°C; MC7805BTG extends to -40°C to 125°C. PSRR differs: MC7805ACTG and MC7805BTG provide 68dB and 83dB respectively at 120Hz. Quiescent current varies slightly (6mA to 8mA). Selection depends on temperature requirements and noise performance needs.
Q: Why would L7805ABV or L7805ACV be preferred over MC7805 variants?
A: L7805 series from STMicroelectronics provides 1.5A output current, offering 50% additional capacity margin. This is beneficial for designs operating near 1A limits or requiring future current headroom. Both are active and ROHS3 compliant. Trade-off is cross-manufacturer sourcing.
Q: Are 500mA variants (MC78M05 series) acceptable substitutes?
A: MC78M05 variants are acceptable only if application current requirements do not exceed 500mA. The KA7805AE is rated for 1A; using 500mA parts in 1A applications risks thermal stress and potential shutdown. Verify actual circuit current draw before substitution.
Q: What is the significance of ROHS3 compliance?
A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All active substitute parts listed are ROHS3 compliant, suitable for commercial and industrial applications subject to environmental regulations. The KA7805AE does not specify ROHS status.
Q: Can NCV7805BTG be used in non-automotive applications?
A: Yes. NCV7805BTG meets automotive qualification (AEC-Q100) but functions in standard applications. However, product status is obsolete; availability may be limited. Prefer active alternatives unless automotive qualification is specifically required.
Q: Does package type affect thermal performance?
A: All listed parts use TO-220-3 packages with identical mechanical dimensions and thermal characteristics. Thermal performance depends on die design and internal construction rather than external package type. Verify thermal resistance (θJA) specifications if thermal management is critical for specific applications.
Q: What is the impact of different quiescent current (Iq) values?
A: Quiescent current ranges from 6mA to 8mA across substitutes. In battery-powered or low-power standby applications, lower Iq (6mA) reduces parasitic power consumption. Difference of 2mA is typically negligible in line-powered applications but may be significant in ultra-low-power designs.
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