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onsemi MC33167T
- Part No.:
- MC33167T
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
MC33167T.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,264
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Product details
Overview
MC33167T from onsemi is a fixed-frequency voltage-mode switching regulator IC designed for step-down, voltage-inverting, and step-up/down dc-dc converter topologies. It integrates a 5.0 A output switch, 72 kHz oscillator with on-chip timing, precision 5.05 V ±2% reference, cycle-by-cycle current limiting, and thermal shutdown. It operates from 7.5 V to 40 V input and supports industrial temperature range (−40°C to +85°C), commonly used in automotive power supplies and industrial embedded converters.
For engineers reviewing the MC33167T datasheet, pinout, applications, or equivalent options, key selection considerations include its 5.0 A switch current capability, −40°C to +85°C operating range, TO-220-5 package with heatsink-connected tab (Pin 3), fixed 72 kHz frequency, and compatibility with inverting/step-down configurations requiring minimal external components.
Technical Context
The MC33167T implements voltage-mode PWM control using an internal error amplifier referenced to a trimmed 5.05 V bandgap, driving a latching comparator against a 72 kHz sawtooth oscillator waveform. Its output stage uses a high-current NPN transistor capable of 5.5–8.0 A peak current with source-saturation voltage of (VCC − 1.5) V at 5.0 A.
Protection includes undervoltage lockout with 5.9 V startup threshold and 0.9 V hysteresis, cycle-by-cycle current limiting triggered by internal sense resistor comparison, and thermal shutdown activating at ~170°C. Standby mode reduces supply current to 36 µA when compensation pin voltage drops below 0.15 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5.0 A continuous output switch current - enables direct drive of medium-power buck/inverting converters without external MOSFETs. |
| Oscillator Frequency | 72 kHz nominal (62–79 kHz over temp) - fixed internal timing enables predictable EMI profile and simplifies filter design. |
| Reference Voltage | 5.05 V ±2% at 25°C - precision internal reference eliminates need for external divider in 5.0 V output designs. |
| Input Voltage Range | 7.5 V to 40 V - supports wide-range industrial and automotive battery inputs including 12 V and 24 V systems. |
| Operating Temperature | −40°C to +85°C - qualified for under-hood automotive and industrial environments requiring extended thermal margin. |
| Current Limit Threshold | 6.5 A typical (5.5–8.0 A min/max) - cycle-by-cycle protection prevents switch overstress during overload or short-circuit events. |
| Standby Supply Current | 36 µA at 12 V - ultra-low quiescent current enables energy-efficient standby operation in always-on systems. |
Pinout & Package
MC33167T is housed in a 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (GND) and intended for heatsink mounting. Pin spacing and outline conform to JEDEC TO-220 standard; moisture sensitivity level (MSL) = 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Compensation | Output of error amplifier; connects to RC network for loop stability tuning - critical for transient response and phase margin. |
| Pin 2 | Switch Output | Collector of internal NPN power transistor - drives external inductor/diode in buck, boost, or inverting topologies. |
| Pin 3 | GND / Heatsink Tab | Power ground reference and thermal path - must be soldered to large copper area or heatsink for thermal management. |
| Pin 4 | VCC | Primary power supply input (7.5–40 V); powers internal circuitry and bias networks - requires local 330 µF bulk capacitance. |
| Pin 5 | Voltage Feedback | Inverting input of error amplifier - senses regulated output via resistive divider; clamping below 0.15 V enables standby mode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A Switch | Eliminates need for external power transistor in ≤5 A applications, reducing BOM count and PCB footprint in compact converters. |
| Fixed 72 kHz Oscillator | Enables consistent EMI filtering and predictable inductor sizing; no external timing components required for basic operation. |
| 5.05 V ±2% Reference | Supports accurate 5.0 V output regulation without external feedback resistor trimming - improves production yield and load regulation. |
| Cycle-by-Cycle Current Limit | Provides immediate overcurrent protection per switching cycle, preventing thermal runaway during fault conditions without latch-up. |
| −40°C to +85°C Operation | Validated performance across full industrial temperature range - suitable for engine control units, motor drives, and factory automation. |
Applications
| Automotive Engine Control Unit (ECU) Power Supply | Industrial Programmable Logic Controller (PLC) I/O Module |
|---|---|
|
Use Scenario: Regulating 12 V battery input to stable 5.0 V for microcontroller, CAN transceiver, and sensor interface circuits in under-hood ECUs. IC Role / Device Role / Timing Role: Primary step-down switching controller with integrated 5.0 A switch and thermal shutdown - manages power conversion and fault protection. Use Value: Delivers 5.0 V @ 5.0 A with <±0.04% line regulation and 78.9% efficiency at 12 V input, meeting ASIL-B functional safety margins for non-safety-critical subsystems. |
Use Scenario: Generating isolated −12 V rail from 24 V DC bus for analog signal conditioning and op-amp biasing in modular PLC backplanes. IC Role / Device Role / Timing Role: Voltage-inverting regulator controller - converts positive input to negative output using external inductor and Schottky diode. Use Value: Achieves −12 V @ 1.7 A with 79.5% efficiency and 78 mVpp ripple, leveraging internal 5.05 V reference and cycle-by-cycle current limit for robustness against field-induced transients. |
| Off-Line AC/DC Preconverter Stage | Distributed Power Architecture (DPA) Postregulator |
|
Use Scenario: Serving as post-regulator after a flyback preconverter to deliver tightly regulated 24 V output from rectified 350 V DC bus in industrial SMPS. IC Role / Device Role / Timing Role: Step-up/down controller with external MOSFET - handles wide-input-voltage variation while maintaining constant output. Use Value: Supports 10–24 V input range with 0.017% line regulation and 87.8% efficiency at 0.9 A load, enabling cost-effective replacement of linear regulators in legacy equipment upgrades. |
Use Scenario: Providing independent 5.0 V, 12 V, and −12 V outputs in multi-rail distributed power systems for test instrumentation and data acquisition modules. IC Role / Device Role / Timing Role: Triple-output synchronous controller - regulates main rail and derives auxiliary rails via transformer-coupled windings. Use Value: Enables 84.2% total system efficiency with ±0.029% line regulation on 5.0 V rail, reducing thermal stress and improving long-term reliability in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-5.0 | Lower 3.0 A switch current; fixed 5.0 V output only; no inverting capability; 150 kHz switching frequency. | Suitable for low-power step-down only; lacks voltage-inverting and step-up/down flexibility of MC33167T. | Select LM2596-5.0 only for cost-sensitive, single-rail 5 V applications where 3 A output suffices and topology flexibility is unnecessary. |
| UC3843BD1R2G | Current-mode controller (not integrated switch); requires external MOSFET; 250 kHz max frequency; no built-in thermal shutdown. | Used in higher-efficiency, higher-frequency designs with custom power stages; lacks integrated protection features of MC33167T. | Choose UC3843BD1R2G when designing >100 kHz converters with discrete FETs and need programmable frequency or tighter current sensing. |
Compared with LM2596-5.0, MC33167T delivers 67% higher output current and supports inverting topologies; versus UC3843BD1R2G, it integrates protection and power switching but trades off frequency agility and external component control - making MC33167T optimal for rugged, medium-power industrial dc-dc conversion where simplicity and reliability dominate.
Availability
MC33167T is available at Aetrix Electronics and suitable for automotive power supplies, industrial PLC modules, off-line preconverters, and distributed power architectures requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MC33167T 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC33167T belongs to onsemi's legacy monolithic switching regulator family, engineered for high-reliability dc-dc conversion in harsh environments - emphasizing integration, thermal robustness, and simplified design for cost-sensitive industrial and automotive applications.
FAQ
What is the maximum output current capability of the MC33167T?
The MC33167T features an integrated NPN power switch rated for 5.0 A continuous output current, with a typical current limit threshold of 6.5 A (min 5.5 A, max 8.0 A). Actual achievable output depends on thermal design: with proper heatsinking per Case 314B layout guidelines, MC33167T reliably delivers 5.0 A in step-down configurations at ambient temperatures up to +85°C.
Does the MC33167T support voltage-inverting converter topologies?
Yes, the MC33167T explicitly supports voltage-inverting configurations, as documented in Figure 23 of its datasheet. It achieves this by re-referencing the IC ground pin to the negative output rail, allowing the internal error amplifier and switch to regulate a negative output voltage - demonstrated with −12 V @ 1.7 A operation and 79.5% efficiency.
What package options are available for the MC33167T?
The MC33167T is offered exclusively in the 5-lead TO-220 package (Case 314B), with the metal tab internally connected to Pin 3 (GND) for heatsink mounting. While the MC33167 series also includes D2PAK variants (e.g., MC33167D2TG), the "T" suffix specifically denotes the TO-220 version - confirmed by ordering codes MC33167TVG and package diagrams on page 16.
How does the MC33167T implement thermal protection?
The MC33167T incorporates internal thermal shutdown circuitry that disables the output switch when junction temperature exceeds approximately 170°C. This protection forces the PWM latch into reset state, halting switching until temperature falls below the hysteresis threshold. It is not a substitute for proper heatsinking - datasheet Figure 29 provides copper-area derating curves for safe operation at elevated ambient temperatures.
Can the MC33167T operate in low-power standby mode?
Yes, the MC33167T enters low-power standby mode when the voltage at Pin 5 (compensation) is held below 0.15 V, reducing supply current to 36 µA at 12 V VCC. This feature is implemented via internal clamping circuitry and enables energy-efficient sleep states in battery-backed or always-on industrial systems without external enable logic.
MC33167T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- 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):
- 7.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5.05V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 5.5A (Switch)
- Frequency - Switching:
- 72kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
MC33167T FAQ
1.How can I place an order for MC33167T through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33167T 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 MC33167T reliable?
The price and inventory of MC33167T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33167T is usually 5 days.
3.What payment methods are accepted for MC33167T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33167T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33167T?
MC33167T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33167T 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 MC33167T?
For technical support, including MC33167T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33167T requirements.
6.How does Aetrix verify that MC33167T is sourced from the original manufacturer or authorized distributors?
All MC33167T 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 MC33167T meets industry standards.
7.What is the process for return or replacement of MC33167T?
All MC33167T units undergo pre-shipment inspection (PSI). If there is an issue with MC33167T, 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 MC33167T part is unused and in its original packaging.
Return procedure for MC33167T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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