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onsemi KA78L05ADTF
- Part No.:
- KA78L05ADTF
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
KA78L05ADTF.pdf
- Description:
- IC REG LINEAR 5V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,022
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Product details
Overview
KA78L05ADTF from Fairchild Semiconductor is a fixed-output +5 V, 100 mA positive linear voltage regulator in an 8-pin SOP package with thermal overload and short-circuit protection. It delivers ±5% output voltage tolerance at 25°C, features 1.7 V dropout voltage, and supports input voltages up to 30 V - used for powering low-current logic circuits, microcontroller peripherals, and sensor interfaces in industrial control modules.
For engineers reviewing the KA78L05ADTF datasheet, pinout, applications, or equivalent options, key selection criteria include its 8-SOP footprint, GND-redundant pin configuration (Pins 2, 3, 6, 7), 80 dB ripple rejection at 120 Hz, and guaranteed operation across 0°C to +125°C junction temperature range.
Technical Context
The KA78L05ADTF integrates internal reference voltage, error amplifier, pass transistor, thermal shutdown, and short-circuit current limiting in a monolithic IC. Its architecture uses a bandgap reference and series pass element to maintain stable 5 V output under load currents from 1 mA to 100 mA.
It operates with minimal external components: a 0.33 µF input capacitor and 0.1 µF output capacitor are recommended per typical application circuit. The device exhibits –0.65 mV/°C temperature coefficient of output voltage and 40 µV/VO output noise over 10 Hz–100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±5% at 25°C - ensures compatibility with TTL/CMOS logic supply rails |
| Max Output Current | 100 mA - sufficient for powering multiple low-power ICs or sensors without external boost |
| Dropout Voltage | 1.7 V at 25°C - enables regulation from as low as 6.7 V input when output is 5 V |
| Ripple Rejection | 80 dB at 120 Hz - suppresses AC line-derived noise in transformer-based supplies |
| Line Regulation | 6 mV max over 8–20 V input - maintains tight output stability despite input variation |
| Load Regulation | 5 mV max over 1–40 mA load - minimizes voltage sag during dynamic current draw |
| Quiescent Current | 2.0–5.5 mA - low standby consumption suitable for battery-backed subsystems |
Pinout & Package
KA78L05ADTF is housed in an 8-pin Small Outline Package (SOP) with exposed pad (not thermally enhanced per datasheet). Pin 1 is Output, Pins 2/3/6/7 are all Ground terminals (internally tied), Pin 4 and Pin 5 are No Connect (NC), and Pin 8 is Input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated +5 V supply node - requires 0.1 µF ceramic capacitor to ground for stability |
| 2, 3, 6, 7 | GND | Multiple ground connections reduce PCB trace inductance and improve transient response |
| 4, 5 | NC | No internal connection - must remain unconnected; no pull-up/down required |
| 8 | Input | Unregulated DC input (up to 30 V) - requires 0.33 µF capacitor to ground near pin |
Key Features
| Feature | Design Value |
|---|---|
| Thermal Overload Protection | Shuts down regulator when junction temperature exceeds safe limit - prevents permanent damage during sustained overload |
| Short-Circuit Current Limiting | Clamps output current to safe level during output-to-ground fault - enables automatic recovery after fault removal |
| ±5% Output Voltage Tolerance | Guaranteed at 25°C - meets standard logic supply requirements without post-regulation trimming |
| Low Output Noise | 40 µV/VO over 10 Hz–100 kHz - suitable for noise-sensitive analog front-ends and ADC references |
| Wide Operating Temperature | 0°C to +125°C junction range - validated for industrial ambient environments without derating |
Applications
| Industrial Sensor Interface | Microcontroller Power Supply |
|---|---|
Use Scenario: Powering analog temperature/humidity sensors and signal-conditioning op-amps in factory automation nodes. IC Role / Device Role / Timing Role: Primary 5 V local regulator delivering clean, stable bias to precision analog circuitry. Use Value: 80 dB ripple rejection and 40 µV/VO noise ensure <1 LSB error in 12-bit ADC conversions. | Use Scenario: Supplying core logic and I/O banks of 8-bit MCUs (e.g., PIC16F, STM8) in programmable logic controllers. IC Role / Device Role / Timing Role: Fixed-voltage LDO providing regulated VDD independent of main 12 V or 24 V rail fluctuations. Use Value: 1.7 V dropout allows reliable operation even when input drops to 6.7 V during brown-out conditions. |
| Legacy RS-232 Transceiver Bias | EEPROM & Real-Time Clock Support |
Use Scenario: Generating +5 V for MAX232-level RS-232 transceivers in embedded serial gateways. IC Role / Device Role / Timing Role: Dedicated low-noise 5 V source isolating transceiver power from noisy digital domains. Use Value: Multiple GND pins (2,3,6,7) minimize ground bounce and prevent data corruption on high-speed UART lines. | Use Scenario: Providing backup-supply-cleaned 5 V to I²C EEPROMs and RTC chips in energy-metering hardware. IC Role / Device Role / Timing Role: Low-quiescent-current (2.0 mA typ.) regulator sustaining nonvolatile memory during main power interruption. Use Value: 5.5 mA max quiescent current enables >100-hour hold-up time using small backup capacitors. |
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 |
|---|---|---|---|
| MC78L05ACDR2G | Same 5 V/100 mA output, but TO-92 and SOIC-8 variants available; 1.7 V dropout; ±5% tolerance; 75 dB ripple rejection | SOIC-8 variant has single GND pin (Pin 2), differing from KA78L05ADTF's quad-GND layout | Select when board layout prioritizes legacy SOIC-8 footprint compatibility over multi-GND noise immunity |
| LM78L05ACM/NOPB | 5 V/100 mA, ±5% tolerance, 1.7 V dropout, but only 65 dB ripple rejection and higher 3.5 mA typical quiescent current | Lacks redundant GND pins; requires tighter input filtering for same noise performance | Choose where cost sensitivity outweighs need for highest PSRR and lowest ground impedance |
Compared with KA78L05ADTF, MC78L05ACDR2G offers identical electrical specs but less robust ground routing, while LM78L05ACM/NOPB trades 15 dB lower ripple rejection and higher IQ for broader second-source availability - making KA78L05ADTF optimal for noise-critical, thermally constrained industrial designs.
Availability
KA78L05ADTF is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power supplies, RS-232 transceiver biasing, and EEPROM/RTC support circuits requiring stable component supply and long-term manufacturability.
Supply support for KA78L05ADTF 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
Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer acquired by ON Semiconductor in 2016; known for rugged, cost-optimized linear regulators and discrete power devices.
The KA78LXXA series was designed specifically for space-constrained, low-power industrial and consumer applications needing reliable fixed-voltage regulation without external compensation.
FAQ
What is the maximum input voltage rating for KA78L05ADTF?
The KA78L05ADTF supports a maximum input voltage of 30 V when regulating 5 V output. This rating is specified in the Absolute Maximum Ratings table and applies under pulse test conditions with controlled junction temperature. Sustained operation near this limit requires adequate PCB copper area or heatsinking due to power dissipation constraints (≤0.75 W).
Does KA78L05ADTF require external capacitors, and what values are recommended?
Yes, KA78L05ADTF requires two external capacitors: a 0.33 µF ceramic capacitor between Pin 8 (Input) and ground, and a 0.1 µF ceramic capacitor between Pin 1 (Output) and ground. These values are specified in the Typical Application diagram and ensure stability, transient response, and noise suppression - placement within 5 mm of respective pins is critical for performance.
How does the quad-GND configuration (Pins 2, 3, 6, 7) benefit KA78L05ADTF in PCB layout?
The four dedicated GND pins in KA78L05ADTF reduce effective ground path inductance and resistance, lowering ground bounce during load transients. This improves regulation accuracy and noise immunity - especially beneficial in mixed-signal systems where analog and digital grounds must be tightly coupled without introducing switching noise into sensitive nodes.
Is KA78L05ADTF suitable for automotive applications?
No, KA78L05ADTF is not qualified for automotive use. Its operating junction temperature range is 0°C to +125°C, and it lacks AEC-Q100 qualification, extended temperature screening, or automotive-grade reliability testing. It is intended for industrial and commercial equipment where ambient temperatures remain below +85°C and supply transients are limited.
What is the output voltage tolerance of KA78L05ADTF over temperature and load?
KA78L05ADTF guarantees ±5% output voltage tolerance at 25°C. Over full temperature (0°C to +125°C) and load (1–100 mA), total deviation remains within ±6% as confirmed by Load Regulation (max 50 mV) and Temperature Coefficient (–0.65 mV/°C) specifications - resulting in worst-case output of 4.7 V minimum and 5.3 V maximum under extreme conditions.
KA78L05ADTF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 5.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
KA78L05ADTF FAQ
1.How can I place an order for KA78L05ADTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KA78L05ADTF 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 KA78L05ADTF reliable?
The price and inventory of KA78L05ADTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA78L05ADTF is usually 5 days.
3.What payment methods are accepted for KA78L05ADTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA78L05ADTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA78L05ADTF?
KA78L05ADTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA78L05ADTF 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 KA78L05ADTF?
For technical support, including KA78L05ADTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA78L05ADTF requirements.
6.How does Aetrix verify that KA78L05ADTF is sourced from the original manufacturer or authorized distributors?
All KA78L05ADTF 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 KA78L05ADTF meets industry standards.
7.What is the process for return or replacement of KA78L05ADTF?
All KA78L05ADTF units undergo pre-shipment inspection (PSI). If there is an issue with KA78L05ADTF, 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 KA78L05ADTF part is unused and in its original packaging.
Return procedure for KA78L05ADTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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