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onsemi KA78M05RTF
- Part No.:
- KA78M05RTF
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
KA78M05RTF.pdf
- Description:
- IC REG LINEAR 5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,373
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Product details
Overview
KA78M05RTF from ON Semiconductor is a fixed-output, 3-terminal, 0.5 A positive linear voltage regulator delivering a stable 5 V output with ±2% tolerance over load (5 mA–350 mA), line (7–25 V), and temperature (−40°C to +125°C) variations. It integrates thermal overload, short-circuit, and safe operating area (SOA) protection, and is commonly used in industrial power supplies and embedded control subsystems requiring robust, low-cost DC regulation.
For engineers reviewing the KA78M05RTF datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning for key specs, validated D-PAK package details, and two confirmed alternative regulators with documented functional and application-level differences.
Technical Context
The KA78M05RTF implements a classic series-pass architecture with internal reference, error amplifier, current generator, and SOA protection circuitry. Its dropout voltage is 2 V at 500 mA, requiring minimum input of 7 V for reliable 5 V output under full load.
It operates across −40°C to +125°C junction temperature range and features 80 dB ripple rejection at 120 Hz with 300 mA load. Quiescent current remains tightly bounded between 4.0–6.0 mA at 25°C, enabling predictable standby power budgeting in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±0.25 V (guaranteed 4.75–5.25 V across full load/line/temp range) |
| Max Output Current | 0.5 A continuous (peak current capability up to 700 mA for transient loads) |
| Dropout Voltage | 2 V at 500 mA - dictates minimum input headroom for regulation |
| Ripple Rejection | 80 dB at 120 Hz - suppresses rectified AC noise in unregulated DC inputs |
| Thermal Resistance θJA | 92 °C/W (D-PAK on standard PCB) - defines max power dissipation before thermal shutdown |
| Quiescent Current | 4.0–6.0 mA - enables accurate low-power system current modeling |
| Line Regulation | 50 mV (7–25 V input range) - ensures stable output despite upstream supply variation |
Pinout & Package
KA78M05RTF is housed in a surface-mount D-PAK (TO-252) package with gull-wing leads, optimized for automated assembly and moderate power dissipation in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input supply connection | Accepts 7–35 V; must be decoupled with ≥0.33 μF ceramic capacitor near device |
| 2 (GND) | Reference ground node for regulator feedback and protection circuits | Must be low-impedance path to system ground; shared with output capacitor return |
| 3 (Output) | Regulated 5 V output terminal | Requires ≥0.1 μF ceramic output capacitor for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Integrated SOA protection | Prevents destruction during sustained overload by dynamically limiting power dissipation in pass transistor |
| Short-circuit current limit | 300 mA typical - protects against wiring faults while allowing safe restart after fault clearance |
| Thermal shutdown | Activates at ~150°C junction temperature and auto-recovers upon cooling - prevents permanent damage |
| Low output noise | 40 μV/VO (10 Hz–100 kHz) - minimizes interference in analog-sensing or RF-adjacent circuits |
| Wide operating temperature | −40°C to +125°C - supports deployment in automotive engine compartments and industrial enclosures |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering microcontrollers, optocouplers, and digital logic in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5 V local regulator supplying isolated field-side interface circuitry. Use Value: Thermal and short-circuit protection ensures uninterrupted operation during sensor cable shorts or ESD events. |
Use Scenario: Providing clean 5 V rail for door module MCUs, window motor drivers, and LED status indicators. IC Role / Device Role / Timing Role: Secondary voltage regulator downstream of vehicle battery and pre-regulator. Use Value: −40°C to +125°C rating meets automotive under-hood ambient requirements without derating. |
| Consumer Set-Top Box Power Rails | Medical Diagnostic Peripheral Supplies |
|
Use Scenario: Generating 5 V for HDMI PHY, IR receiver, and front-panel display in cable/satellite receivers. IC Role / Device Role / Timing Role: Low-noise, fixed-output regulator for mixed-signal subsystems sensitive to switching noise. Use Value: 40 μV/VO output noise avoids visible artifacts in video signal paths. |
Use Scenario: Powering non-invasive patient monitoring sensors (e.g., pulse oximeter LEDs, analog front ends). IC Role / Device Role / Timing Role: Isolated 5 V supply for Class II medical device subassemblies with no direct patient contact. Use Value: Guaranteed 4.75–5.25 V output ensures ADC reference stability and consistent LED drive current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78M05CDTX | Same electrical specs; TO-220 through-hole package, higher θJA (66 °C/W), no tape-and-reel option | Suitable for prototyping or low-volume manual assembly; less suitable for high-density SMT production | Select when board reworkability or heatsink mounting is prioritized over automated placement |
| LM78M05CT | Identical performance envelope; same TO-220 package as MC78M05CDTX but with rail packaging only | Limited to legacy designs using older Fairchild-branded parts; no D-PAK variant available | Choose only if maintaining exact form-fit-function with existing TO-220-based PCB layouts |
Compared with MC78M05CDTX and LM78M05CT, the KA78M05RTF offers surface-mount compatibility, tighter production packaging (tape-and-reel), and lower thermal resistance in the D-PAK footprint-making it optimal for volume-manufactured, space-constrained applications where automated assembly and thermal efficiency are critical.
Availability
KA78M05RTF is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and consumer media devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for KA78M05RTF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The KA78M05RTF belongs to ON Semiconductor's legacy linear regulator product line, designed for cost-sensitive, high-reliability applications demanding fixed 5 V output with integrated protection and wide temperature operation.
FAQ
What is the maximum input voltage for KA78M05RTF?
The absolute maximum input voltage for KA78M05RTF is 35 V, but for reliable operation across temperature and load, the recommended maximum is 25 V. Exceeding 25 V increases power dissipation and thermal stress, especially at full 500 mA load. The KA78M05RTF datasheet specifies line regulation up to 25 V, and operation beyond that requires careful thermal analysis and may reduce long-term reliability.
Does KA78M05RTF require external capacitors?
Yes, KA78M05RTF requires an input capacitor (≥0.33 μF ceramic) placed close to the Input pin and an output capacitor (≥0.1 μF ceramic) at the Output pin. These capacitors ensure stability, improve transient response, and suppress high-frequency noise. Omitting them risks oscillation or poor regulation under dynamic load conditions, as confirmed in the official KA78M05RTF application circuits.
Is KA78M05RTF pin-compatible with other 78M05 variants?
No - KA78M05RTF uses the D-PAK (TO-252) package with pinout Input-GND-Output, whereas TO-220 variants like KA78M05TU or MC78M05CDTX share the same pin order but differ mechanically and thermally. While electrically identical, the KA78M05RTF is not a drop-in replacement due to different land patterns, soldering profiles, and thermal interface requirements.
What protection features does KA78M05RTF include?
KA78M05RTF integrates three core protections: thermal shutdown (activates at ~150°C junction temperature), short-circuit current limiting (300 mA typical), and safe operating area (SOA) protection for the internal pass transistor. These functions are fully internal and require no external components, enabling robust operation in unpredictable load environments without additional circuitry.
Can KA78M05RTF be used in automotive applications?
Yes - KA78M05RTF is qualified for operation from −40°C to +125°C junction temperature and is widely deployed in automotive body control modules, infotainment peripherals, and lighting controllers. Its thermal and short-circuit protections meet AEC-Q100 stress test expectations for non-safety-critical subsystems, though formal AEC-Q100 certification status should be verified per ON Semiconductor's latest product documentation.
KA78M05RTF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 500mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
KA78M05RTF FAQ
1.How can I place an order for KA78M05RTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KA78M05RTF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for KA78M05RTF reliable?
The price and inventory of KA78M05RTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA78M05RTF is usually 5 days.
3.What payment methods are accepted for KA78M05RTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA78M05RTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA78M05RTF?
KA78M05RTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA78M05RTF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for KA78M05RTF?
For technical support, including KA78M05RTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA78M05RTF requirements.
6.How does Aetrix verify that KA78M05RTF is sourced from the original manufacturer or authorized distributors?
All KA78M05RTF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that KA78M05RTF meets industry standards.
7.What is the process for return or replacement of KA78M05RTF?
All KA78M05RTF units undergo pre-shipment inspection (PSI). If there is an issue with KA78M05RTF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The KA78M05RTF part is unused and in its original packaging.
Return procedure for KA78M05RTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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