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onsemi KA78L08AZTA
- Part No.:
- KA78L08AZTA
- Manufacturer:
- onsemi
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KA78L08AZTA.pdf
- Description:
- IC REG LINEAR 8V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,230
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Product details
Overview
KA78L08AZTA from Fairchild Semiconductor is a fixed-output +8V, 100mA positive linear voltage regulator in TO-92 package with thermal overload protection and short-circuit current limiting. It delivers ±5% output voltage tolerance at 25°C, features 1.7V dropout voltage, and supports input voltages up to 30V - ideal for low-power microcontroller supply rails and sensor biasing in industrial control modules.
For engineers reviewing the KA78L08AZTA datasheet, pinout, applications, or equivalent options, this page provides verified technical context, pin-level design meaning, real-world use cases, and validated alternative options for stable 8V regulation in space-constrained PCBs.
Technical Context
The KA78L08AZTA implements a monolithic three-terminal linear regulator architecture with internal reference, error amplifier, pass transistor, and protection circuitry. Its thermal shutdown activates at ~150°C junction temperature, and short-circuit limiting holds output current near 100mA under fault conditions.
It operates across 0°C to +125°C ambient (with junction up to +150°C), requires only two external bypass capacitors (0.33µF input, 0.1µF output), and maintains 8.0V output within ±5% over load (1–100mA), line (10.5–23V input), and temperature variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.0V ±5% at 25°C - ensures compatible logic-level supply for 8V-tolerant peripherals |
| Max Output Current | 100mA - sufficient for MCU cores, op-amps, and small-signal analog stages |
| Input Voltage Range | 10.5V to 23V - supports common 12V rail derating with 1.7V dropout margin |
| Dropout Voltage | 1.7V typical at 25°C - enables regulation from 12V input down to 8V output with headroom |
| Ripple Rejection | 39–70dB at 120Hz - suppresses AC ripple from unregulated wall adapters or DC-DC post-regulation |
| Quiescent Current | 2.0–5.5mA - low standby draw suitable for battery-backed or always-on subsystems |
| Thermal Shutdown | Activates at ~150°C junction - prevents damage during sustained overload or poor heatsinking |
Pinout & Package
KA78L08AZTA uses the TO-92 through-hole package (3.60 × 4.58 × 14.47 mm), optimized for manual assembly and prototyping. Pin 1 is Output, Pin 2 is Ground, Pin 3 is Input - matching standard 78Lxx pinout for drop-in compatibility with legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated +8V supply node - must connect to local 0.1µF ceramic capacitor within 5mm for stability |
| 2 | GND | Ground reference for both regulator feedback and load return - shared with input capacitor ground |
| 3 | Input | Unregulated DC input (≥10.5V) - requires 0.33µF tantalum or ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +8V Output | Eliminates external resistor network - reduces BOM count and layout complexity for dedicated 8V rails |
| ±5% Output Tolerance | Meets industrial-grade voltage accuracy without trimming - simplifies qualification for non-critical analog supplies |
| Thermal Overload Protection | Auto-recovery shutdown prevents permanent failure during transient overloads or ambient temperature spikes |
| Short-Circuit Current Limit | Holds output current near 100mA during fault - protects upstream power sources and avoids board-level damage |
| Low Quiescent Current | 2.0mA typical - extends battery life in portable instrumentation using 8V analog front-ends |
Applications
| Industrial Sensor Interface | Microcontroller Power Supply |
|---|---|
Use Scenario: Powering 8V-tolerant analog sensors (e.g., pressure transducers, RTD signal conditioners) in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Primary 8V bias regulator delivering clean, stable voltage to sensor excitation and ADC reference circuits. Use Value: ±5% output tolerance and 70dB ripple rejection ensure <0.4V noise on sensor supply - preserving 12-bit measurement integrity. | Use Scenario: Supplying core logic and I/O banks of 8-bit MCUs (e.g., PIC16F, STM8) in HVAC controllers and motor drives. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 12V system rail to MCU-compatible 8V VDD. Use Value: 100mA capacity supports full-speed operation with peripherals active; TO-92 footprint allows placement directly beside MCU. |
| Portable Test Equipment | Legacy Industrial Control |
Use Scenario: Providing regulated 8V for op-amp rails and LCD bias in handheld multimeters and calibrators. IC Role / Device Role / Timing Role: Low-noise analog supply generator with thermal protection during extended bench use. Use Value: 60µV/VO output noise and 1.7V dropout enable clean analog performance from single 9V battery or 12V adapter. | Use Scenario: Replacing obsolete 78L08 regulators in aging programmable logic controllers and relay panels. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement maintaining identical electrical behavior and mechanical fit. Use Value: Identical TO-92 pinout and ±5% tolerance ensure zero PCB rework - accelerating legacy system maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar positive fixed-voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78L08ACP | Same 8V/100mA spec, ±5% tolerance, TO-92 package; higher max input voltage (35V vs. 30V) | Supports wider input range in 24V industrial systems with higher transient margins | Preferred when input may exceed 30V or when ON Semiconductor sourcing is required |
| LM78L08ACZ | Identical 8V/100mA rating and TO-92 footprint; tighter ±4% tolerance; lower quiescent current (1.8mA typ) | Better voltage accuracy and efficiency for precision analog subsystems | Select when tighter output tolerance or lower standby current is critical |
Compared with KA78L08AZTA, MC78L08ACP offers higher input voltage headroom but no improvement in noise or thermal response, while LM78L08ACZ delivers tighter regulation and lower IQ at the cost of slightly reduced ripple rejection - making each suitable for distinct trade-off priorities in industrial power design.
Availability
KA78L08AZTA is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power supplies, portable test equipment, and legacy control system replacements requiring stable component supply with long-term continuity.
Supply support for KA78L08AZTA 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 leading analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy linear regulator portfolio remains widely deployed in industrial and automotive systems.
The KA78LXXA series was designed specifically for cost-sensitive, low-current fixed-voltage regulation in space-constrained applications - emphasizing robustness, ease of use, and compatibility with legacy 78Lxx footprints.
FAQ
What is the maximum input voltage for KA78L08AZTA?
The KA78L08AZTA supports a maximum input voltage of 30V for 8V output configurations. This rating is defined in the Absolute Maximum Ratings table and accounts for safe operation with thermal margin. Exceeding 30V risks permanent damage even with brief transients, so input filtering and clamping should be designed accordingly. The KA78L08AZTA datasheet specifies 10.5V minimum input for proper regulation.
Does KA78L08AZTA require external capacitors?
Yes, KA78L08AZTA requires two external capacitors: a 0.33µF capacitor between Input and Ground, and a 0.1µF capacitor between Output and Ground. These are mandatory for stability and transient response, as confirmed in the Typical Application diagram and Electrical Characteristics notes. Ceramic or tantalum types are acceptable, and both must be placed as close as possible to their respective pins per the KA78L08AZTA layout guidance.
What is the operating temperature range of KA78L08AZTA?
The KA78L08AZTA is rated for operation from 0°C to +125°C ambient temperature, with junction temperature reaching up to +150°C under load. This range is specified in the Ordering Information table and validated across all electrical parameters. The device's thermal shutdown activates near 150°C junction to prevent damage, making it suitable for enclosed industrial enclosures without forced airflow.
Is KA78L08AZTA pin-compatible with other 78Lxx regulators?
Yes, KA78L08AZTA uses the standard TO-92 pinout: Pin 1 = Output, Pin 2 = Ground, Pin 3 = Input - identical to industry-standard 78Lxx devices including LM78L08 and MC78L08. This enables direct substitution in existing layouts without PCB modification, provided input voltage and load current remain within KA78L08AZTA's 30V/100mA limits.
What protection features does KA78L08AZTA include?
KA78L08AZTA integrates thermal overload protection and short-circuit current limiting as core safety features. Thermal shutdown disables the output above ~150°C junction temperature and recovers automatically upon cooling. Short-circuit limiting caps output current near 100mA during faults, preventing destructive current flow. Both functions are implemented internally and require no external components - confirmed in the Features section and Internal Block Diagram of the KA78L08AZTA datasheet.
KA78L08AZTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 5.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KA78L08AZTA FAQ
1.How can I place an order for KA78L08AZTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KA78L08AZTA 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 KA78L08AZTA reliable?
The price and inventory of KA78L08AZTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA78L08AZTA is usually 5 days.
3.What payment methods are accepted for KA78L08AZTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA78L08AZTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA78L08AZTA?
KA78L08AZTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA78L08AZTA 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 KA78L08AZTA?
For technical support, including KA78L08AZTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA78L08AZTA requirements.
6.How does Aetrix verify that KA78L08AZTA is sourced from the original manufacturer or authorized distributors?
All KA78L08AZTA 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 KA78L08AZTA meets industry standards.
7.What is the process for return or replacement of KA78L08AZTA?
All KA78L08AZTA units undergo pre-shipment inspection (PSI). If there is an issue with KA78L08AZTA, 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 KA78L08AZTA part is unused and in its original packaging.
Return procedure for KA78L08AZTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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