My Inquiry
My Account
onsemi MC33063AVD
- Part No.:
- MC33063AVD
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33063AVD.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC33063AVD from onsemi is a monolithic DC-DC switching regulator IC supporting step-up, step-down, and inverting topologies. It integrates a temperature-compensated 1.25 V reference, comparator, oscillator with active current limit, driver, and 1.5 A Darlington output switch. Designed for minimal external components, it operates from 3.0 V to 40 V input and delivers adjustable output voltage in industrial power supplies and battery-powered systems.
For engineers reviewing the MC33063AVD datasheet, pinout, applications, or equivalent options, key selection factors include its −40°C to +125°C operating ambient range, SOIC-8 package (D suffix), 100 kHz max switching frequency, 2% reference accuracy, and internal current limiting with 300 mV typical IPk sense threshold.
Technical Context
The MC33063AVD implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing capacitor (CT) sets frequency via charge/discharge cycles. Its Darlington output stage enables 1.5 A peak switch current with saturation voltage of 1.0 V (typ) at 1.0 A, avoiding hard-saturation issues seen in non-Darlington configurations.
It features a precision 1.25 V ±2% bandgap reference referenced to the inverting comparator input (Pin 5), enabling stable feedback across temperature. The current-limit circuit monitors emitter voltage of the internal NPN switch (Pin 7) and triggers cycle-by-cycle shutdown when sensed voltage exceeds ~300 mV, providing inherent short-circuit protection without external sensing resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 40 V - supports wide-input industrial and automotive battery systems without pre-regulation |
| Output Switch Current | 1.5 A - enables direct drive of medium-power converters without external boost transistors |
| Reference Voltage | 1.25 V ±2% - ensures accurate output voltage setting with minimal feedback resistor tolerance impact |
| Max Switching Frequency | 100 kHz - balances efficiency, EMI, and inductor size for cost-sensitive designs |
| Operating Ambient Range | −40°C to +125°C - qualified for extended-temperature industrial and under-hood automotive applications |
| Current Limit Threshold | 300 mV (typ) - defines precise overcurrent trip point at Pin 7, simplifying current-sense resistor calculation |
| Supply Current (Standby) | 4.0 mA (max) - enables low-quiescent operation in battery-backed or energy-conscious systems |
Pinout & Package
MC33063AVD is housed in an 8-pin SOIC package (Case 751, D suffix), with exposed pad not present. Thermal resistance is RJA = 160°C/W, requiring moderate PCB copper area for thermal management at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SWC) | Switch Collector | High-side collector of internal Darlington switch; connects to inductor in step-up or diode anode in step-down |
| 2 (GND) | Ground Reference | Power and signal ground return for all internal circuits and external feedback network |
| 3 (VCC) | Power Supply Input | Bias supply for internal logic and driver; must be ≥3.0 V and ≤40 V; decoupling required |
| 4 (DRVC) | Driver Collector | Collector of internal driver transistor; used only in external-switch configurations (not Darlington mode) |
| 5 (COMP) | Comparator Inverting Input | Feedback node for output regulation; connected to resistor divider from VOUT to set 1.25 V reference point |
| 6 (IPk) | Current Limit Sense | Emitting terminal of internal switch; voltage drop here triggers current limit when ≥300 mV |
| 7 (SW E) | Switch Emitter | Emitter of internal Darlington switch; tied to GND in standard configurations; forms current-sense path with Pin 6 |
| 8 (CT) | Oscillator Timing Capacitor | Connects external capacitor to set oscillator frequency; discharge/charge current ratio determines fosc |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Darlington Output Switch | Eliminates need for external high-current transistors in ≤1.5 A applications, reducing BOM count and layout complexity |
| Adjustable Output Voltage | Enabled by 1.25 V reference and external resistor divider on Pin 5, supporting any VOUT ≥1.25 V |
| Internal Current Limit Protection | Fixed 300 mV sense threshold at Pin 6 provides cycle-by-cycle overcurrent shutdown without external op-amps or comparators |
| Wide Input Voltage Range | 3.0 V to 40 V operation accommodates 12 V/24 V industrial rails and unregulated battery inputs (e.g., 4×AA, lead-acid) |
| Temperature-Stable Reference | 1.25 V ±2% over −40°C to +125°C ensures consistent regulation across harsh environments |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Generating isolated 5 V or 12 V rails from 24 V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing step-down conversion with fixed-frequency current-mode regulation. Use Value: Delivers 500 mA output with 83.7% efficiency at 25 V input, leveraging −40°C to +125°C rating for cabinet-mounted reliability. | Use Scenario: Providing regulated 5 V for microcontrollers and CAN transceivers in door modules or lighting controllers. IC Role / Device Role / Timing Role: Step-down regulator converting vehicle battery (9–16 V) to stable 5 V with built-in current limiting for short-circuit robustness. Use Value: Meets automotive ambient requirements without derating; achieves ±0.12% line regulation per datasheet Figure 11 test conditions. |
| Portable Medical Instrument | Battery-Powered Test Equipment |
Use Scenario: Generating −12 V bias for op-amp rails in handheld ECG front-ends powered by 4×AA alkaline cells. IC Role / Device Role / Timing Role: Voltage-inverting converter using internal switch and external diode/inductor to produce negative output. Use Value: Achieves 62.2% efficiency at 5 V input and 100 mA load (Figure 13), with <±0.012% line regulation over 4.5–6.0 V input range. | Use Scenario: Boosting 3.3 V from Li-ion battery to 12 V for analog front-end amplifiers and ADC references. IC Role / Device Role / Timing Role: Step-up controller driving external Schottky diode and 170 µH inductor to generate stable 12 V output. Use Value: Supports 175 mA output with 87.7% efficiency (Figure 9); 400 mVpp ripple reduced to 40 mVpp with optional LC filter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063AD | Same architecture but rated for 0°C to +70°C ambient; lacks extended temperature qualification | Suitable only for commercial-grade applications; not qualified for industrial or automotive use | Select MC34063AD only if ambient temperature remains within 0–70°C and automotive/industrial certification is unnecessary |
| NCV33063AVDR2G | Identical electrical specs and package; AEC-Q100 qualified with PPAP capability and tighter process controls | Required for automotive safety-critical subsystems where traceability and change control are mandated | Choose NCV33063AVDR2G when automotive qualification (AEC-Q100) and site-specific control are mandatory |
Compared with MC33063AVD, MC34063AD offers identical functionality but limited temperature range, while NCV33063AVDR2G adds automotive qualification and process rigor-neither is pin-compatible drop-in replacements without verifying system-level compliance requirements.
Availability
MC33063AVD is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, portable medical instruments, and battery-powered test equipment requiring stable component supply across extended temperature ranges.
Supply support for MC33063AVD 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 ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MC33063A series was designed as a cost-optimized, general-purpose switching regulator IC family targeting industrial and automotive power conversion where high integration, wide input range, and extended temperature operation are essential.
FAQ
What is the maximum switching frequency of the MC33063AVD?
The MC33063AVD supports a maximum oscillator frequency of 100 kHz, determined by the external timing capacitor (CT) value and internal charge/discharge currents. At 25°C with CT = 1.0 nF, typical frequency is 33 kHz; higher values reduce frequency, lower values increase it-but operation beyond 100 kHz is not guaranteed per datasheet specifications. The MC33063AVD's oscillator design prioritizes stability and current-mode control integrity over ultra-high frequency.
Does the MC33063AVD require external components to function as a step-down regulator?
Yes, the MC33063AVD requires external components including an inductor, output capacitor, feedback resistor divider, timing capacitor, and rectifier diode to implement a functional step-down converter. Figure 11 in the datasheet shows a complete reference design delivering 5.0 V/500 mA from 25 V input using a 220 µH inductor, 470 pF CT, and 1.2 kΩ/3.6 kΩ feedback network. No internal compensation or power MOSFETs are included-the IC provides only the control logic and switch driver.
What is the purpose of Pin 6 (IPk) on the MC33063AVD?
Pin 6 (IPk) on the MC33063AVD is the current limit sense terminal. It monitors the voltage drop across the internal switch's emitter resistor during conduction. When this voltage reaches ~300 mV (typ), the IC terminates the switch-on time for that cycle, providing cycle-by-cycle overcurrent protection. This eliminates the need for external current-sense amplifiers in basic implementations, though external sensing may be added for enhanced accuracy or fault logging.
Can the MC33063AVD operate from a 3.3 V input supply?
No, the MC33063AVD cannot reliably operate from a 3.3 V input. Its absolute minimum VCC is 3.0 V, but the internal Darlington switch requires sufficient VCE headroom to avoid saturation-datasheet Figure 6 shows VCE(sat) rising sharply below 5 V. Practical operation starts at ≥4.5 V; for true 3.3 V input compatibility, consider modern alternatives like the LM2678 or TPS5430, as the MC33063AVD's architecture is optimized for ≥5 V nominal inputs.
How does the MC33063AVD differ from the MC34063A in terms of temperature rating?
The MC33063AVD is rated for −40°C to +125°C operating ambient temperature, qualifying it for extended-temperature industrial and automotive under-hood applications. In contrast, the MC34063A is specified for 0°C to +70°C only. This difference stems from process and screening variations-not pinout or electrical function-and is explicitly documented in the "Operating Ambient Temperature Range" table on page 2 of the datasheet. Both share identical SOIC-8 packaging and core functionality.
MC33063AVD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 1.25V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC33063AVD FAQ
1.How can I place an order for MC33063AVD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33063AVD 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 MC33063AVD reliable?
The price and inventory of MC33063AVD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AVD is usually 5 days.
3.What payment methods are accepted for MC33063AVD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AVD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33063AVD?
MC33063AVD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33063AVD 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 MC33063AVD?
For technical support, including MC33063AVD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AVD requirements.
6.How does Aetrix verify that MC33063AVD is sourced from the original manufacturer or authorized distributors?
All MC33063AVD 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 MC33063AVD meets industry standards.
7.What is the process for return or replacement of MC33063AVD?
All MC33063AVD units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AVD, 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 MC33063AVD part is unused and in its original packaging.
Return procedure for MC33063AVD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC33063AVD Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
