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onsemi MC33167THG
- Part No.:
- MC33167THG
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
MC33167THG.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,781
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Product details
Overview
MC33167THG 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, precision 5.05 V ±2% reference, cycle-by-cycle current limiting, and thermal shutdown - enabling compact, cost-effective power supplies in automotive and industrial systems.
For engineers reviewing the MC33167THG datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design parameters, package-specific layout guidance, and validated alternative options - all grounded in the official ON Semiconductor MC34167/MC33167 Rev. 10 datasheet (April 2025).
Technical Context
The MC33167THG 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 92–100% duty cycle range, driving a latching PWM comparator that prevents multiple pulses per cycle.
Protection architecture includes undervoltage lockout (startup at 5.9 V with 0.9 V hysteresis), cycle-by-cycle current limiting (6.5 A typical threshold), 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 |
|---|---|
| Oscillator Frequency | 72 kHz nominal (62–79 kHz over −40 °C to +85 °C); sets minimum external component count and defines switching loss vs. filter size trade-off. |
| Output Switch Current | 5.0 A continuous (6.5 A typical current limit); supports high-current step-down converters up to 40 V input without external MOSFET. |
| Reference Voltage | 5.05 V ±2% at 25 °C; enables stable 5.0 V output without external resistor divider, compensating for typical 1% cable drop. |
| Operating Input Range | 7.5 V to 40 V; accommodates wide automotive battery ranges and industrial 24 V rails while maintaining regulation. |
| Duty Cycle Range | 0% to 95% maximum; allows full output voltage adjustment from near-zero to just below input in step-down mode. |
| Thermal Shutdown Threshold | ~170 °C junction temperature; protects against catastrophic failure during overload or inadequate heatsinking. |
| Standby Supply Current | 36 µA at 12 V supply; enables low-power sleep modes in battery-backed or energy-sensitive systems. |
Pinout & Package
MC33167THG 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. The package is Pb-free (G suffix) and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Compensation (Comp) | Error amplifier output / loop compensation node | Connects to RC network (RF, CF) for stability tuning; clamping below 150 mV enables 36 µA standby mode. |
| Pin 2: Switch Output (SW) | 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) for flyback recovery. |
| Pin 3: Ground (GND) | Power and signal reference plane | Common return for internal circuits; tab connection enables direct heatsink attachment; must be low-impedance path. |
| Pin 4: VCC | Primary power supply input | Accepts 7.5–40 V; powers internal circuitry and oscillator; UVLO activates below 5.9 V with 0.9 V hysteresis. |
| Pin 5: Feedback (FB) | Inverting input of error amplifier | Internally biased to 5.05 V reference; senses output via resistor divider; determines regulated output voltage (VOUT = 5.05 × (1 + R1/R2)). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A NPN switch | Eliminates need for external power transistor in ≤5 A step-down designs, reducing BOM count and PCB area. |
| Fixed 72 kHz oscillator with on-chip timing | Removes external timing capacitor/resistor; ensures consistent frequency across temperature and unit-to-unit variation. |
| 0%–95% adjustable duty cycle | Enables output voltages from near-zero up to just below input rail - critical for flexible step-down and inverting topologies. |
| Cycle-by-cycle current limiting | Provides instantaneous overcurrent protection per switching cycle, preventing switch destruction during short-circuit events. |
| −40 °C to +85 °C operating range | Qualified for under-hood automotive and industrial environments where extended temperature tolerance is mandatory. |
| Pb-free TO-220 package (MSL 1) | Complies with RoHS; MSL 1 allows unlimited floor life - simplifies manufacturing and eliminates bake requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V DC-DC Converter |
|---|---|
|
Use Scenario: Regulating 12 V battery input to stable 5.0 V for microcontroller, CAN transceiver, and sensor interfaces in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary step-down controller with integrated 5.0 A switch, providing regulated output without external MOSFET or driver. Use Value: Reduces solution size by 30% vs. controller+MOSFET alternatives; 72 kHz switching enables compact magnetics and meets CISPR-25 EMI limits. |
Use Scenario: Converting unregulated 24 V industrial rail to isolated 5 V/3 A and −12 V/1.7 A outputs for PLC I/O and analog front-ends. IC Role / Device Role / Timing Role: Core voltage-inverting regulator (Figure 23) and step-down controller in multi-output distributed power architecture. Use Value: Single IC supports dual-polarity outputs; −40 °C to +85 °C rating ensures reliability in factory-floor enclosures with ambient temperature swings. |
| Off-Line AC-DC Preconverter | Brushed DC Motor Speed Control |
|
Use Scenario: Serving as post-regulator in 125 W offline preconverter (Figure 28), stepping down 24 V intermediate bus to precise 5 V for digital logic. IC Role / Device Role / Timing Role: Secondary-side fixed-frequency PWM regulator ensuring tight line/load regulation despite upstream transformer ripple. Use Value: 0.039% line regulation and 20 mVpp ripple enable noise-sensitive MCU operation; UVLO prevents startup during brownouts. |
Use Scenario: Controlling speed of 18 V brushed motor using EMF feedback (Figure 27), delivering variable 0–3260 RPM with closed-loop stability. IC Role / Device Role / Timing Role: Voltage-mode PWM generator modulating drive to external NPN switch (MJE13005), with error amp sensing back-EMF. Use Value: Internal 5.05 V reference and 80 dB error amp gain ensure <1% speed regulation across 12–24 V input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34167TVG | Identical architecture and pinout; rated for 0 °C to +70 °C ambient (vs. −40 °C to +85 °C for MC33167THG). | Suitable for commercial-grade equipment only; not qualified for automotive or extended-temperature industrial use. | Select MC34167TVG only if operating environment stays within 0–70 °C and cost is prioritized over temperature margin. |
| LM2596T-5.0 | Fixed 5.0 V output (non-adjustable); 3.0 A max switch current (vs. 5.0 A); 150 kHz switching (vs. 72 kHz). | Limited to single-output 5 V step-down; cannot support inverting or step-up/down topologies without redesign. | Choose LM2596T-5.0 only for simple, low-cost 5 V/≤3 A supplies where topology flexibility and temperature range are not required. |
Compared with MC34167TVG and LM2596T-5.0, MC33167THG uniquely combines −40 °C to +85 °C operation, 5.0 A integrated switch, and full topology support (step-down/inverting/step-up-down) - making it the sole option for ruggedized, multi-rail, or automotive-qualified designs.
Availability
MC33167THG is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V power distribution, and off-line preconverter subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MC33167THG 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.
The MC33167THG belongs to the MC33167/MC34167 series of monolithic switching regulators, engineered specifically for robust, low-component-count dc-dc conversion in harsh environments - emphasizing thermal resilience, wide input range, and topology versatility.
FAQ
What is the maximum output current capability of the MC33167THG?
The MC33167THG integrates a high-current NPN switch rated for 5.0 A continuous output. Its cycle-by-cycle current limit is typically 6.5 A, with absolute maximum peak switch current specified at 8.0 A. Actual deliverable output current depends on thermal management, input voltage, and duty cycle - e.g., at 12 V input and 5 V output, full 5.0 A is achievable with adequate heatsinking per Figure 29.
Can the MC33167THG be used in a voltage-inverting configuration?
Yes, the MC33167THG supports voltage-inverting operation as documented in Figure 23 of the datasheet. It requires 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 its −1.5 V limit. This configuration delivers regulated negative outputs such as −12 V/1.7 A with 79.5% efficiency at 12 V input.
What is the purpose of Pin 5 (Feedback) on the MC33167THG?
Pin 5 is the inverting input of the internal error amplifier, internally biased to the 5.05 V reference. It senses output voltage via an external resistor divider (R1/R2). The regulation equation is VOUT = 5.05 × (1 + R1/R2). For fixed 5.0 V output, no divider is needed - connect Pin 5 directly to the regulated output. This pin determines regulation accuracy and loop stability.
Does the MC33167THG require an external timing capacitor?
No, the MC33167THG 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 or RT components. This simplifies design, improves frequency consistency across units and temperature, and reduces bill-of-materials count.
How does the standby mode function on the MC33167THG?
Standby mode is activated by clamping Pin 1 (Compensation) to <150 mV, which disables the internal oscillator and PWM latch. This reduces supply current to 36 µA at 12 V - ideal for battery-backed systems. The mode is implemented using a simple transistor or logic-level FET controlled by a system microcontroller, as shown in Figure 16 of the datasheet.
MC33167THG 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
MC33167THG FAQ
1.How can I place an order for MC33167THG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33167THG 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 MC33167THG reliable?
The price and inventory of MC33167THG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33167THG is usually 5 days.
3.What payment methods are accepted for MC33167THG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33167THG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33167THG?
MC33167THG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33167THG 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 MC33167THG?
For technical support, including MC33167THG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33167THG requirements.
6.How does Aetrix verify that MC33167THG is sourced from the original manufacturer or authorized distributors?
All MC33167THG 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 MC33167THG meets industry standards.
7.What is the process for return or replacement of MC33167THG?
All MC33167THG units undergo pre-shipment inspection (PSI). If there is an issue with MC33167THG, 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 MC33167THG part is unused and in its original packaging.
Return procedure for MC33167THG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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