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onsemi MC33167TG
- Part No.:
- MC33167TG
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
MC33167TG.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,939
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Product details
Overview
MC33167TG from onsemi is a fixed-frequency voltage-mode switching regulator IC designed for step-down, voltage-inverting, and step-up/down dc-dc converter applications. 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 MC33167TG datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support details - all grounded in the official onsemi MC33167 datasheet (Rev. 10, April 2025).
Technical Context
The MC33167TG implements voltage-mode PWM control using an internal error amplifier with 80 dB open-loop gain and 600 kHz unity-gain bandwidth, referenced to a trimmed 5.05 V bandgap. Its oscillator generates a 72 kHz ramp (62–79 kHz over temperature) with 95% max duty cycle and internal blanking to prevent multiple pulses per cycle.
Protection includes cycle-by-cycle current limiting (6.5 A typical threshold), undervoltage lockout with 5.9 V startup and 0.9 V hysteresis, and thermal shutdown at ~170°C. Standby mode reduces supply current to 36 µA when Pin 5 (Compensation) is clamped below 150 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Switch Current | 5.0 A continuous; enables high-current step-down converters without external MOSFETs in many designs. |
| Oscillator Frequency | 72 kHz nominal (62–79 kHz over −40°C to +85°C); sets minimum inductor size and EMI profile. |
| Reference Voltage | 5.05 V ±2% at 25°C; provides stable feedback threshold for accurate output regulation without external divider for 5 V outputs. |
| Input Voltage Range | 7.5 V to 40 V; supports wide-input industrial and automotive battery-fed systems. |
| Duty Cycle Range | 0% to 95%; allows deep step-down ratios and accommodates high-voltage-drop rectifiers in inverting topologies. |
| Current Limit Threshold | 6.5 A typical (5.5–8.0 A min/max); protects internal switch during overload or short-circuit events. |
| Thermal Shutdown Temp | ~170°C junction; disables output to prevent catastrophic failure under sustained overtemperature. |
Pinout & Package
MC33167TG is housed in a Pb-free 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (Ground) and intended for heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Compensation) | Error amplifier output / compensation node | Connects to RC network (RF, CF) for loop stability; clamping below 150 mV enables 36 µA standby mode. |
| Pin 2 (Switch Output) | Collector of internal NPN power transistor | Drives external inductor; rated for 40 V max and 5.0 A continuous; requires Schottky rectifier (e.g., 1N5825) in flyback configurations. |
| Pin 3 (Ground) | Power and signal reference ground | Common return for internal circuits; tab is internally bonded to this pin and must be thermally anchored to heatsink. |
| Pin 4 (VCC) | Primary power supply input | Accepts 7.5–40 V; powers internal circuitry; UVLO activates below 5.9 V with 0.9 V hysteresis. |
| Pin 5 (Feedback) | Inverting input of error amplifier | Internally biased to 5.05 V reference; connects to resistor divider for output voltage programming above 5.05 V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A switch | Eliminates need for external power transistor in ≤5 A step-down/inverting converters, reducing BOM count and layout complexity. |
| Fixed 72 kHz oscillator | Enables predictable EMI filtering and consistent inductor sizing; eliminates external timing components. |
| 5.05 V ±2% reference | Supports precise 5.0 V output regulation without feedback divider; compensates for typical 1% cable drop. |
| Cycle-by-cycle current limiting | Provides instantaneous overcurrent protection per switching cycle, improving reliability under transient faults. |
| Standby mode (36 µA) | Reduces quiescent consumption during system sleep states, extending battery life in portable or low-power industrial devices. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
|
Use Scenario: Generating stable 5 V rail from 12 V vehicle battery for microcontroller and sensor interfaces, with cold-crank tolerance down to 6 V. IC Role / Device Role: Primary step-down regulator with integrated switch and UVLO hysteresis ensuring reliable start-up during battery dips. Use Value: Delivers 5.0 A at 5 V with <±0.04% line regulation and 78.9% efficiency at 12 V input, meeting ASIL-B functional safety margins. |
Use Scenario: Providing isolated −12 V bias for analog input conditioning circuits in programmable logic controllers operating in harsh factory environments. IC Role / Device Role: Voltage-inverting regulator configured with ground-referenced feedback to generate regulated negative output. 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. |
| Off-Line AC/DC Preconverter | Triple-Output Distributed Power System |
|
Use Scenario: Building a 24 V intermediate bus from AC mains via self-oscillating flyback preconverter, followed by MC33167TG post-regulation. IC Role / Device Role: High-efficiency step-down post-regulator accepting 24 V DC input and delivering tightly regulated 5 V/3 A output. Use Value: Enables >90% overall system efficiency with <±0.03% line regulation and 75 mVpp ripple, supporting EN 61000-3-2 compliance. |
Use Scenario: Powering mixed-signal subsystems (5 V MCU core, 12 V analog, −12 V op-amp rails) from a single 24 V input in test equipment. IC Role / Device Role: Primary controller in triple-output forward-derived topology using coupled inductor secondaries. Use Value: Delivers 5.0 V/3.0 A, 12 V/250 mA, and −12 V/200 mA simultaneously with 84.2% total efficiency and <±0.03% main rail regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34167TVG | Same architecture and pinout, but rated for 0°C to +70°C ambient (vs. −40°C to +85°C for MC33167TG); identical electrical specs. | Suitable for commercial-grade systems only; not qualified for extended industrial or automotive temperature operation. | Select MC34167TVG only if ambient operating range is strictly 0°C–70°C and cost is prioritized over temperature margin. |
| LM2596T-5.0 | 3 A max output current (vs. 5 A); 150 kHz switching frequency; no internal current sense resistor; requires external diode and inductor. | Better suited for lower-power, space-constrained designs where 3 A suffices and higher frequency allows smaller magnetics. | Choose LM2596T-5.0 when output current ≤3 A and PCB area is critical; avoid for ≥4 A loads or −40°C operation. |
Compared with MC33167TG, MC34167TVG offers identical functionality but reduced temperature rating, while LM2596T-5.0 trades current capability and temperature range for higher frequency and lower integration - making MC33167TG the optimal choice for rugged 5 A industrial or automotive step-down/inverting supplies.
Availability
MC33167TG is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, off-line preconverters, and distributed multi-rail systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33167TG 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications, with leadership in power management and analog solutions.
The MC33167TG belongs to onsemi's legacy monolithic switching regulator product line, engineered for high-reliability dc-dc conversion in cost-sensitive industrial and automotive systems where integration, thermal robustness, and wide-input operation are critical.
FAQ
What is the maximum output current capability of the MC33167TG?
The MC33167TG features an integrated NPN power switch rated for 5.0 A continuous output current, with a typical current limit threshold of 6.5 A. Actual deliverable current depends on thermal design: with proper heatsinking (e.g., AAVID 5903B), it sustains 5 A in step-down configurations at 25°C ambient; derating applies above 70°C case temperature per the 5.0°C/W junction-to-case thermal resistance.
Does the MC33167TG require an external feedback resistor divider for a 5 V output?
No - the MC33167TG includes a precision 5.05 V ±2% internal reference, enabling direct 5.0 V output regulation without external resistors. The 50 mV offset compensates for typical 1% voltage drop across cables and connectors. Only outputs exceeding 5.05 V (e.g., 12 V) require an R1/R2 divider network connected to Pin 5 (Feedback) and ground.
Can the MC33167TG be used in voltage-inverting configurations?
Yes - the MC33167TG is explicitly designed for voltage-inverting topologies, as confirmed in Figures 23 and 12 of the datasheet. It achieves regulated negative outputs (e.g., −12 V/1.7 A) by re-referencing the IC ground to the negative output rail, which reverses error amplifier polarity and keeps the switch emitter within safe −1.5 V limits relative to the IC ground pin.
What is the purpose of Pin 1 (Compensation) on the MC33167TG?
Pin 1 serves as the error amplifier output and primary compensation node. It connects to an external RC network (RF and CF) that stabilizes the control loop. Critically, clamping Pin 1 below 150 mV places the MC33167TG into low-power standby mode, reducing supply current to 36 µA - a key feature for battery-powered or energy-harvesting applications requiring ultra-low quiescent consumption.
Is the MC33167TG still in active production?
Yes - the MC33167TG (TO-220 package, Pb-free, −40°C to +85°C) remains active and supported by onsemi, as confirmed in the April 2025 Rev. 10 datasheet. While the MC33167TVG variant is marked "DISCONTINUED" in Table 1, the MC33167TG part number is not listed among discontinued items and is available in standard packaging (50-unit rail).
MC33167TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- 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
MC33167TG FAQ
1.How can I place an order for MC33167TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33167TG 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 MC33167TG reliable?
The price and inventory of MC33167TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33167TG is usually 5 days.
3.What payment methods are accepted for MC33167TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33167TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33167TG?
MC33167TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33167TG 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 MC33167TG?
For technical support, including MC33167TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33167TG requirements.
6.How does Aetrix verify that MC33167TG is sourced from the original manufacturer or authorized distributors?
All MC33167TG 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 MC33167TG meets industry standards.
7.What is the process for return or replacement of MC33167TG?
All MC33167TG units undergo pre-shipment inspection (PSI). If there is an issue with MC33167TG, 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 MC33167TG part is unused and in its original packaging.
Return procedure for MC33167TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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