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onsemi MC33167TH
- Part No.:
- MC33167TH
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
MC33167TH.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,945
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Product details
Overview
MC33167TH from onsemi is a fixed-frequency voltage-mode switching regulator IC designed for step-down, inverting, and step-up/down DC-DC converter topologies. It integrates a 5.0 A output switch, 72 kHz oscillator, precision 5.05 V ±2% reference, cycle-by-cycle current limiting, and thermal shutdown - enabling compact, high-current power supplies in automotive and industrial systems.
For engineers reviewing the MC33167TH datasheet, pinout, applications, or equivalent options, key selection considerations include its −40 °C to +85 °C operating range, TO-220-5 package with heatsink-connected Pin 3, 7.5–40 V input range, and compatibility with inverting/step-down configurations requiring no external resistor for 5.05 V output.
Technical Context
The MC33167TH implements voltage-mode PWM control using an internal error amplifier (80 dB gain, 600 kHz unity-gain bandwidth) referenced to a trimmed 5.05 V bandgap. Its oscillator generates a 72 kHz ramp with 95% max duty cycle, feeding a latch-based PWM comparator that meters single pulses per cycle to prevent subharmonic oscillation.
Protection is implemented via three independent circuits: undervoltage lockout (6.3 V startup threshold with 0.9 V hysteresis), cycle-by-cycle current sensing (6.5 A typical limit), and thermal shutdown (activation 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 - supports high-power step-down converters without external MOSFETs |
| Oscillator Frequency | 72 kHz fixed - enables predictable EMI filtering and stable loop compensation |
| Reference Voltage | 5.05 V ±2% - provides accurate output regulation without external feedback resistors for 5 V rails |
| Input Voltage Range | 7.5 V to 40 V - compatible with 12 V/24 V automotive and industrial bus systems |
| Operating Temperature | −40 °C to +85 °C - qualified for under-hood and industrial ambient environments |
| Duty Cycle Range | 0% to 95% - enables wide output voltage adjustment in inverting and step-up/down topologies |
| Standby Supply Current | 36 µA at 12 V - allows low-power sleep modes in battery-backed systems |
Pinout & Package
MC33167TH is housed in a 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (Ground) and intended for heatsink mounting. Pin spacing and outline conform to JEDEC TO-220 standards, supporting vertical PCB mounting and direct thermal coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Compensation (Comp) | Output of error amplifier; connects to RC network for loop stability - clamping below 150 mV enables standby mode |
| Pin 2 | Switch Output (SW) | Collector of internal NPN power transistor; drives external inductor/diode in all topologies |
| Pin 3 | Ground (GND) | Power and signal ground reference; internally tied to heatsink tab for thermal conduction |
| Pin 4 | Supply Input (VCC) | Main power input (7.5–40 V); powers internal circuitry and bias networks |
| Pin 5 | Voltage Feedback (FB) | Inverting input of error amplifier; referenced to internal 5.05 V - sets output voltage via external divider |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A NPN switch | Eliminates need for external power transistor in ≤5 A step-down/inverting designs |
| Fixed 72 kHz oscillator with on-chip timing | Removes external timing capacitor; ensures consistent frequency across temperature and voltage |
| 5.05 V ±2% internal reference | Enables precise 5 V output without feedback resistors - reduces BOM count and layout sensitivity |
| Cycle-by-cycle current limiting | Provides robust short-circuit protection without foldback delay or secondary sensing components |
| Undervoltage lockout with hysteresis | Prevents erratic startup below 5.9 V and ensures clean enable/disable transitions during brownout |
| Thermal shutdown at ~170 °C | Protects against sustained overload or inadequate heatsinking without requiring external sensors |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O Power |
|---|---|
Use Scenario: Regulating 5 V rail for microcontroller, CAN transceiver, and sensor interface circuitry in vehicle door modules. IC Role / Device Role / Timing Role: Primary step-down controller converting 12 V battery to stable 5.05 V output with cycle-by-cycle overcurrent protection. Use Value: Delivers 5 A peak current while maintaining ±0.039% line regulation across 10–36 V input - critical for EMC-compliant automotive operation. | Use Scenario: Generating isolated −12 V auxiliary supply for analog input conditioning in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Inverting regulator driving Schottky rectifier and coupled inductor to produce negative output referenced to system ground. Use Value: Achieves 79.5% efficiency at 1.7 A load with 78 mVpp ripple - meets industrial noise immunity requirements without added filtering. |
| Off-Line AC/DC Preconverter Stage | Brushed DC Motor Speed Controller |
Use Scenario: Front-end 24 V pre-regulator in multi-output distributed power supply fed from rectified AC line. IC Role / Device Role / Timing Role: Fixed-frequency step-down controller operating at 50 kHz in self-oscillating flyback configuration with transformer isolation. Use Value: Enables 90% conversion efficiency and 125 W total output - reduces heat sink size and improves system-level reliability. | Use Scenario: Closed-loop speed control of 18 V brushed motor using back-EMF sensing in portable test equipment. IC Role / Device Role / Timing Role: PWM generator with adjustable duty cycle; uses internal oscillator and error amplifier to regulate average motor voltage. Use Value: Maintains ±1% speed stability across 12–24 V input variation - eliminates need for external op-amps or DACs. |
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; rated for 0 °C to +70 °C ambient (vs. −40 °C to +85 °C for MC33167TH) | Not suitable for extended-temperature automotive or industrial deployments | Select MC34167TVG only for commercial-grade applications where ambient stays within 0–70 °C |
| LM2596T-5.0 | Fixed 5.0 V output (non-adjustable), 3 A switch current, 150 kHz switching - lower current, higher frequency, different compensation topology | Lacks inverting capability and requires external diode; limited to step-down only | Choose LM2596T-5.0 for cost-sensitive, low-power 5 V point-of-load applications where 3 A suffices |
Compared with MC34167TH, MC34167TVG offers identical functionality but reduced temperature range, while LM2596T-5.0 trades off adjustability, topology flexibility, and current capability for lower cost and simpler design - making MC33167TH the preferred choice for ruggedized, multi-topology, ≥5 A applications.
Availability
MC33167TH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, off-line preconverters, and brushed motor controllers requiring stable component supply across extended temperature ranges and high-current DC-DC conversion.
Supply support for MC33167TH 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC33167TH belongs to onsemi's legacy monolithic switching regulator product line, engineered for high-reliability, low-component-count DC-DC conversion in harsh environments - emphasizing thermal robustness, integrated protection, and wide-input operation.
FAQ
What is the maximum output current capability of the MC33167TH?
The MC33167TH integrates a 5.0 A NPN power switch with a typical current limit threshold of 6.5 A. Its continuous output current depends on thermal management: with adequate heatsinking (e.g., AAVID 5903B), it delivers 5 A in step-down configurations at full load and ambient up to +85 °C. Derating applies above 70 °C ambient due to thermal shutdown activation at ~170 °C junction temperature. The MC33167TH datasheet specifies 5.5 A minimum peak switch current under test conditions.
Can the MC33167TH be used in an inverting (negative output) configuration?
Yes, the MC33167TH supports voltage-inverting topologies, as confirmed in Figure 23 of the official datasheet. It achieves this by connecting the IC's ground pin (Pin 3) to the negative output rail, which reverses the error amplifier's effective inputs and keeps the switch emitter within safe limits (−1.5 V max relative to ground). The MC33167TH maintains 79.5% efficiency at −12 V/1.7 A output with 78 mVpp ripple, using a 1N5825 Schottky diode and 190 µH inductor.
What is the purpose of Pin 1 (Compensation) on the MC33167TH?
Pin 1 (Compensation) is the output of the internal error amplifier and serves two critical functions: (1) it connects to an external RC network (RF and CF) for loop stability compensation, and (2) clamping it below 150 mV places the MC33167TH into low-power standby mode, reducing supply current to 36 µA. This dual-role pin enables both dynamic performance tuning and power-saving states - a key feature distinguishing the MC33167TH from simpler regulators.
Does the MC33167TH require an external timing capacitor?
No, the MC33167TH does not require an external timing capacitor. Its 72 kHz oscillator uses an internal trimmed current source and on-chip timing components, eliminating the need for external CT. This simplifies design, improves frequency stability across temperature and voltage, and reduces component count - a core advantage highlighted in the datasheet's "Features" section and confirmed in the oscillator description on page 7.
What package options are available for the MC33167TH?
The MC33167TH is offered exclusively in the 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (Ground) for heatsink mounting. While the MC33167 family also includes D2PAK variants (e.g., MC33167D2TG), the "TH" suffix specifically denotes the TO-220 version. This package supports vertical PCB mounting and provides superior thermal performance (θJC = 5.0 °C/W) compared to surface-mount alternatives.
MC33167TH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- 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 Horizontal
MC33167TH FAQ
1.How can I place an order for MC33167TH through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33167TH 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 MC33167TH reliable?
The price and inventory of MC33167TH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33167TH is usually 5 days.
3.What payment methods are accepted for MC33167TH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33167TH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33167TH?
MC33167TH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33167TH 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 MC33167TH?
For technical support, including MC33167TH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33167TH requirements.
6.How does Aetrix verify that MC33167TH is sourced from the original manufacturer or authorized distributors?
All MC33167TH 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 MC33167TH meets industry standards.
7.What is the process for return or replacement of MC33167TH?
All MC33167TH units undergo pre-shipment inspection (PSI). If there is an issue with MC33167TH, 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 MC33167TH part is unused and in its original packaging.
Return procedure for MC33167TH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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