My Inquiry
My Account
STMicroelectronics MC34063EBD-TR
- Part No.:
- MC34063EBD-TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC34063EBD-TR.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:12,089
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC34063EBD-TR from STMicroelectronics is a monolithic DC-DC converter control circuit in SO-8 package, featuring 1.5 A output switch current, 2% reference accuracy, and operation from 3 V to 40 V input. It supports step-up, step-down, and voltage-inverting topologies with internal oscillator up to 100 kHz, used in industrial power supplies and battery-powered instrumentation.
For engineers reviewing the MC34063EBD-TR datasheet, MC34063EBD-TR pinout, MC34063EBD-TR application, or MC34063EBD-TR equivalent, key selection criteria include its -40 °C to +125 °C operating junction temperature, active current limiting via IPK sense (300 mV typ.), Darlington-compatible output stage, and SO-8 thermal resistance (RthJA = 160 °C/W).
Technical Context
The MC34063EBD-TR integrates a temperature-compensated 1.25 V reference, comparator, duty-cycle-controlled oscillator with timing capacitor interface (Pin 3), and a high-current Darlington output switch (Pins 1 & 2). Its current-limiting function operates via external sense resistor connected to Pin 7 (IPK), where 300 mV threshold triggers shutdown.
Oscillator frequency is set by CT (Pin 3) and ranges from 24–42 kHz (typ.) at 1 nF; discharge-to-charge current ratio is 6.2 (typ.), enabling precise duty cycle control. The device supports forced β ≥ 10 in non-Darlington configurations using external driver transistors on Pin 8 (DRC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output switch current | 1.5 A max - supports ≥500 mA continuous output in step-down converters with proper heatsinking |
| Reference voltage accuracy | ±2 % - enables stable output regulation within ±25 mV for 1.25 V reference-based feedback |
| Operating input voltage | 3 V to 40 V - accommodates wide-input industrial rails and automotive cold-crank conditions |
| Quiescent supply current | 2.5 mA typ. - minimizes no-load power loss in battery-backed systems |
| Current limit sense voltage | 300 mV typ. - sets overcurrent threshold with <1% tolerance resistor for precise foldback protection |
| Switch saturation voltage | 0.7 V typ. (Darlington) - limits conduction loss to ≤0.35 W at 0.5 A output switch current |
| Temperature range | -40 °C to +125 °C - qualified for under-hood and industrial ambient environments |
Pinout & Package
MC34063EBD-TR is housed in a surface-mount SO-8 package (4.80 × 3.80 mm, 1.27 mm pitch), compliant with ECOPACK environmental standards. Thermal resistance is RthJA = 160 °C/W and RthJC = 20 °C/W, requiring PCB copper area for thermal management in >500 mA applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SWC | Switch collector | High-side output node of internal Darlington transistor; connects to inductor in step-up or transformer primary in flyback |
| 2 SWE | Switch emitter | Emitting terminal of internal switch; tied to ground in standard step-down configuration |
| 3 TC | Timing capacitor | Controls oscillator frequency and duty cycle via external capacitor (1 nF typical for ~33 kHz) |
| 4 GND | Ground reference | Power and signal return path; must be low-impedance for stable current sensing and reference stability |
| 5 CII | Comparator inverting input | Feedback node for output voltage regulation; referenced to 1.25 V internal bandgap |
| 6 VCC | Supply input | Primary power rail (3–40 V); powers internal logic, reference, and oscillator |
| 7 IPK | Current limit sense | Detects switch current via external shunt; 300 mV threshold triggers cycle-by-cycle current limiting |
| 8 DRC | Driver collector | Open-collector output for driving external NPN/PNP transistors in higher-power configurations |
Key Features
| Feature | Design Value |
|---|---|
| Internal temperature-compensated reference | 1.25 V ±2 % over -40 °C to +125 °C - eliminates need for external precision reference in cost-sensitive designs |
| Active current limiting | 300 mV IPK threshold with fast response - provides robust short-circuit protection without external comparators |
| Dual-mode oscillator control | Charge/discharge current ratio of 6.2 - enables accurate duty cycle tuning across input voltage and load variations |
| Configurable output stage | Darlington (Pins 1/2) or external transistor drive (Pin 8) - supports scalable power from 1 W to >10 W with discrete boost |
| Wide input voltage range | 3 V to 40 V operation - simplifies design across 5 V logic rails, 12 V industrial buses, and 24 V PLC inputs |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: 24 V DC input converted to isolated 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing step-down topology with external MOSFET driver on Pin 8. Use Value: -40 °C to +125 °C rating ensures reliability in uncontrolled cabinet environments; 2% reference maintains ADC reference stability. |
Use Scenario: Single-cell Li-ion (3.0–4.2 V) boosted to 5 V for USB-C peripheral charging and display backlight drivers. IC Role / Device Role / Timing Role: Step-up controller with discontinuous conduction mode, using Pin 3 timing capacitor for fixed 50 kHz switching. Use Value: 2.5 mA quiescent current extends battery life in sleep mode; 1.5 A switch supports ≥1 A peak load during measurement bursts. |
| Automotive Body Control Module | Medical Portable Monitor |
|
Use Scenario: 12 V vehicle bus stepped down to 3.3 V for microcontroller and CAN transceiver power in door modules. IC Role / Device Role / Timing Role: Step-down regulator with external Schottky diode and low-ESR output capacitor; Pin 5 feedback loop closed via resistor divider. Use Value: 40 V absolute max input withstands load-dump transients; 300 mV current limit prevents fuse blow during motor stall events. |
Use Scenario: Inverting converter generating -12 V from 3.3 V MCU rail for op-amp bias in ECG front-end analog stages. IC Role / Device Role / Timing Role: Voltage-inverting controller with Pin 2 grounded and Pin 1 connected to negative output rail. Use Value: 2% reference accuracy ensures consistent gain calibration across temperature; SO-8 footprint enables compact layout near analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34063ACD-TR | 0 °C to +70 °C operating range; same electrical specs except temperature grade | Limited to commercial ambient environments; unsuitable for under-hood or industrial enclosures | Select when cost sensitivity outweighs extended temperature requirement and ambient stays below 70 °C |
| LM2574N-5.0 | Fixed 5 V output; no adjustable feedback; 0.5 A switch current; integrated error amplifier | Requires no external feedback resistors but lacks flexibility for custom output voltages | Choose for simple 5 V step-down only; avoid when needing inverting, step-up, or programmable outputs |
Compared with MC34063ACD-TR, the MC34063EBD-TR delivers guaranteed operation up to +125 °C junction temperature-critical for thermally constrained industrial PCBs-while LM2574N-5.0 trades configurability for lower BOM count in fixed-output applications.
Availability
MC34063EBD-TR is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC34063EBD-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The MC34063 series belongs to ST's legacy analog power management product line, engineered for cost-effective, flexible DC-DC conversion in resource-constrained embedded systems where external component count and thermal resilience are critical.
FAQ
What is the maximum recommended switching frequency for MC34063EBD-TR?
The MC34063EBD-TR oscillator operates up to 100 kHz per datasheet specifications, with typical frequency of 33 kHz at 1 nF timing capacitor. Higher frequencies increase switching losses and reduce efficiency above 60 kHz due to limited gate drive strength and internal propagation delays.
Can MC34063EBD-TR drive an external MOSFET instead of using its internal switch?
Yes-Pin 8 (DRC) provides an open-collector driver output capable of sinking ≥100 mA, enabling direct connection to the gate of an external N-channel MOSFET. This configuration bypasses the internal bipolar switch and supports higher output power and efficiency in step-up or inverting topologies.
How does the current limit function respond to transient overloads?
The IPK pin (Pin 7) senses switch current through an external resistor; when voltage exceeds 300 mV (typ.), the oscillator is immediately disabled for that cycle. This cycle-by-cycle limiting prevents thermal runaway during short circuits and sustains safe operation without latch-off or external fault latching circuitry.
Is MC34063EBD-TR RoHS and REACH compliant?
Yes-MC34063EBD-TR is manufactured in ST's ECOPACK2-compliant SO-8 package, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free terminations and halogen-free molding compound as confirmed in ST's official material declarations.
MC34063EBD-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 38V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 33kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC34063EBD-TR FAQ
1.How can I place an order for MC34063EBD-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34063EBD-TR 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 MC34063EBD-TR reliable?
The price and inventory of MC34063EBD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34063EBD-TR is usually 5 days.
3.What payment methods are accepted for MC34063EBD-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34063EBD-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34063EBD-TR?
MC34063EBD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34063EBD-TR 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 MC34063EBD-TR?
For technical support, including MC34063EBD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34063EBD-TR requirements.
6.How does Aetrix verify that MC34063EBD-TR is sourced from the original manufacturer or authorized distributors?
All MC34063EBD-TR 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 MC34063EBD-TR meets industry standards.
7.What is the process for return or replacement of MC34063EBD-TR?
All MC34063EBD-TR units undergo pre-shipment inspection (PSI). If there is an issue with MC34063EBD-TR, 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 MC34063EBD-TR part is unused and in its original packaging.
Return procedure for MC34063EBD-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC34063EBD-TR 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
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
