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onsemi KA34063ADSTF
- Part No.:
- KA34063ADSTF
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
KA34063ADSTF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,865
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Product details
Overview
KA34063ADSTF from onsemi is a monolithic DC-DC switching regulator controller IC used for step-up, step-down, and inverting converter topologies. It integrates a temperature-compensated bandgap reference (1.24 V), oscillator with 100 Hz–100 kHz frequency range, current-limit sensing (300 mV typical), 1.5 A output switch, and driver stage. It operates from 3.0 V to 40 V input and supports adjustable output voltage in power supply designs for industrial instrumentation.
For engineers reviewing the KA34063ADSTF datasheet, pinout, applications, or equivalent options, key selection considerations include its internal 1.5 A switch saturation voltage (0.45 V min at 1.0 A), short-circuit current limiting, low standby current (2.7 mA typical), and compatibility with standard 8-pin SOIC (SOP) packaging for board-level integration.
Technical Context
The KA34063ADSTF implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by external RC components. Its comparator compares feedback voltage against a precise 1.24 V reference, enabling stable regulation across input and load variations.
It features dual-stage output switching: a high-current NPN transistor (Q1) with integrated current-sense resistor and driver (Q2), supporting direct connection to external inductors and diodes. The device's IPK sense pin enables programmable current limiting via a single resistor, while GND and VCC pins define the reference and supply rails for all internal blocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery-derived supplies without pre-regulation. |
| Output Switch Current | 1.5 A - enables up to ~12 W output power in boost/buck configurations with minimal external components. |
| Reference Voltage | 1.24 V ±3% - sets regulation accuracy baseline for feedback divider design and load transient response. |
| Oscillator Frequency Range | 100 Hz to 100 kHz - allows optimization of inductor size vs. efficiency and EMI in cost-sensitive SMPS designs. |
| Current Limit Threshold | 300 mV typical - defines peak inductor current limit via external sense resistor, enabling overcurrent protection without added circuitry. |
| Supply Current | 2.7–4.0 mA - determines quiescent power draw in standby mode, critical for low-power battery applications. |
| Switch Saturation Voltage | 0.45 V (min at 1.0 A) - directly impacts conduction loss and thermal rise in the internal transistor under full load. |
Pinout & Package
KA34063ADSTF is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) package, 3.95 mm × 4.92 mm body, 1.27 mm pitch, RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Collector | High-current output node connected to inductor/diode in boost/buck/inverting topologies. |
| 2 (GND) | Ground Reference | Common return path for internal circuits, current sense, and external feedback network. |
| 3 (VCC) | Supply Input | Primary power rail for internal logic, oscillator, and driver stages; must be ≥3 V and ≤40 V. |
| 4 (CT) | Oscillator Timing Capacitor | Connects to external capacitor that sets oscillator frequency and discharge/charge ratio. |
| 5 (COMP) | Compensation Node | Internal error amplifier output; connects to RC compensation network for loop stability. |
| 6 (IPK) | Current Limit Sense | Monitors voltage drop across external sense resistor to trigger current limiting at ~300 mV. |
| 7 (INV) | Inverting Input | Feedback node for output voltage divider; compared against 1.24 V internal reference. |
| 8 (REF) | Reference Output | Provides stable 1.24 V reference for external feedback or auxiliary biasing circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A Switch | Eliminates need for external power transistor in low-to-mid power converters (<12 W), reducing BOM count and layout area. |
| Adjustable Output Voltage | Enabled by resistive feedback divider to REF (1.24 V), supporting both fixed and programmable output configurations. |
| Short-Circuit Protection | Implemented via IPK pin sensing and internal current-limit comparator, preventing damage during output faults. |
| Low Standby Current | 2.7 mA typical ICC enables efficient operation in always-on or battery-backed systems where idle power matters. |
| Wide Input Range | 3.0–40 V operation accommodates unregulated 12 V, 24 V, and 36 V industrial bus rails without additional regulators. |
Applications
| Industrial Power Supplies | Automotive Aftermarket Electronics |
|---|---|
Use Scenario: Generating isolated +5 V or +12 V from 24 V truck battery rails in telematics modules. IC Role / Device Role / Timing Role: Primary DC-DC controller managing inductor current, duty cycle, and overcurrent shutdown. Use Value: Enables compact, low-cost buck converter with built-in current limiting and thermal robustness across -40°C to +85°C ambient. | Use Scenario: Powering LED lighting drivers from variable 9–16 V vehicle battery systems. IC Role / Device Role / Timing Role: Step-up controller regulating constant current to LED strings via external MOSFET and sense resistor. Use Value: Delivers stable output despite wide input fluctuations and provides fast overcurrent response to protect LEDs during surge events. |
| Point-of-Load Converters | Legacy Equipment Retrofit |
Use Scenario: Providing +3.3 V or +5 V from existing +12 V backplane in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Synchronous buck controller with external diode and inductor, configured for fixed-frequency operation. Use Value: Offers predictable EMI profile and simple compensation due to fixed-frequency oscillator and known pole-zero locations. | Use Scenario: Replacing obsolete linear regulators in aging test equipment requiring higher efficiency. IC Role / Device Role / Timing Role: Drop-in SMPS controller upgrade enabling >75% efficiency versus <40% for linear solutions. Use Value: Reduces heat sink size and improves reliability without redesigning PCB layout-only minor component swaps required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AP1G | Same functional block diagram and pinout; 1.25 V reference (vs. 1.24 V), slightly higher ICC (3.0 mA typ). | Identical topology support; validated in legacy consumer power supplies with tighter tolerance requirements. | Preferred when sourcing from ON Semiconductor's current active portfolio with identical SOP-8 footprint. |
| LM2574N-5.0 | Fixed 5.0 V output, no adjustable reference; includes internal 52 kHz oscillator and 0.5 A switch - lower current capability. | Limited to fixed-output applications; requires fewer external parts but lacks flexibility in output voltage tuning. | Select when system requires only +5 V and simplified design; not suitable for variable or high-current outputs. |
Compared with KA34063ADSTF, MC34063AP1G offers identical functionality with updated qualification and availability, while LM2574N-5.0 trades adjustability and current drive for simplicity and fixed-voltage convenience-making it viable only for narrow-use cases.
Availability
KA34063ADSTF is available at Aetrix Electronics and suitable for industrial power supplies, automotive aftermarket electronics, and point-of-load converters requiring stable component supply and long-term obsolescence management.
Supply support for KA34063ADSTF 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
onsemi (formerly Fairchild Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The KA34063ADSTF belongs to onsemi's legacy analog power management product line, designed specifically for cost-sensitive, discrete-based DC-DC converter implementations where flexibility, wide input range, and internal switch integration are prioritized over modern integrated FETs or digital control.
FAQ
What is the recommended operating temperature range for KA34063ADSTF?
The KA34063ADSTF is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with its original Fairchild designation and matches the 8-SOP package's thermal performance envelope. While some units may function outside this range, design validation-including thermal derating of the 1.5 A switch and oscillator stability-is required for extended temperature use. The KA34063ADSTF datasheet does not guarantee performance beyond these limits.
Can KA34063ADSTF be used in a step-up (boost) configuration?
Yes, KA34063ADSTF supports step-up operation per its official application schematics and internal block diagram. In boost mode, the SW pin drives the inductor, the diode routes energy to the output capacitor, and feedback is taken from the regulated output via the INV and REF pins. The KA34063ADSTF's 1.5 A switch and 40 V collector rating make it suitable for boost converters up to ~36 V output from 12 V input, provided external components are rated accordingly.
Is KA34063ADSTF pin-compatible with KA34063A in DIP-8 package?
No, KA34063ADSTF is not pin-compatible with KA34063A in DIP-8. Although both share identical electrical functionality and pin functions, KA34063ADSTF uses an 8-pin SOIC (SOP) package with 1.27 mm pitch and gull-wing leads, whereas KA34063A uses a through-hole 8-DIP package with 2.54 mm pitch. Physical mounting, soldering method, and PCB footprint differ entirely-no mechanical interchangeability exists between KA34063ADSTF and KA34063A.
Does KA34063ADSTF include an internal voltage reference?
Yes, KA34063ADSTF includes a precision internal bandgap voltage reference of 1.24 V ±3%, accessible at the REF pin. This reference serves as the comparison threshold for the error amplifier and enables accurate output voltage regulation when used with an external resistive divider on the INV pin. The reference remains stable over temperature and supply voltage, with drift typically less than ±5 mV from 0°C to +70°C per the datasheet's Figure 1.
Why is KA34063ADSTF marked as "Not Recommended for New Design"?
KA34063ADSTF is marked "Not Recommended for New Design" because onsemi has discontinued active development and long-term supply assurance for this legacy part. While still available through distribution channels, it is superseded by newer controllers like the MC34063 series with enhanced ESD ratings, tighter reference tolerances, and extended temperature options. Designers selecting KA34063ADSTF should plan for eventual migration and confirm inventory longevity with Aetrix Electronics before committing to high-volume production.
KA34063ADSTF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100Hz ~ 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
KA34063ADSTF FAQ
1.How can I place an order for KA34063ADSTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KA34063ADSTF 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 KA34063ADSTF reliable?
The price and inventory of KA34063ADSTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA34063ADSTF is usually 5 days.
3.What payment methods are accepted for KA34063ADSTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA34063ADSTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA34063ADSTF?
KA34063ADSTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA34063ADSTF 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 KA34063ADSTF?
For technical support, including KA34063ADSTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA34063ADSTF requirements.
6.How does Aetrix verify that KA34063ADSTF is sourced from the original manufacturer or authorized distributors?
All KA34063ADSTF 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 KA34063ADSTF meets industry standards.
7.What is the process for return or replacement of KA34063ADSTF?
All KA34063ADSTF units undergo pre-shipment inspection (PSI). If there is an issue with KA34063ADSTF, 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 KA34063ADSTF part is unused and in its original packaging.
Return procedure for KA34063ADSTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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