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onsemi MC33167D2T
- Part No.:
- MC33167D2T
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MC33167D2T.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,621
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Product details
Overview
MC33167D2T from onsemi is a fixed-frequency, voltage-mode switching regulator IC designed for step-down, 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. It operates from 7.5 V to 40 V input and supports industrial temperature range (−40°C to +85°C) in D2PAK package.
For engineers reviewing the MC33167D2T datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application configurations (step-down/inverting/step-up-down), and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The MC33167D2T 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.
Current protection uses cycle-by-cycle sensing via an internal resistor; the switch current limit threshold is 6.5 A typical (5.5–8.0 A). Undervoltage lockout activates at 5.9 V (±0.3 V) with 0.9 V hysteresis, and thermal shutdown triggers at ~170°C. Standby mode reduces supply current to 36 µA when compensation pin voltage drops below 150 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Output Current | 5.0 A continuous - enables high-current step-down converters without external MOSFETs |
| Oscillator Frequency | 72 kHz nominal (62–79 kHz over temp) - sets minimum inductor size and EMI profile |
| Reference Voltage | 5.05 V ±2% - provides stable feedback threshold for 5.0 V output with 50 mV headroom for cable drop |
| Input Voltage Range | 7.5 V to 40 V - supports 12 V/24 V automotive and industrial bus inputs |
| Duty Cycle Range | 0% to 95% - allows deep step-down (e.g., 40 V → 5 V) and wide inverting output range |
| Operating Temperature | −40°C to +85°C - qualified for under-hood automotive and industrial ambient conditions |
| Thermal Shutdown | ~170°C junction - protects against sustained overload or inadequate heatsinking |
Pinout & Package
D2PAK (TO-263) surface-mount package (Case 936A), thermally enhanced with exposed metal pad tied to Pin 3 (GND). Heatsink surface electrically connected to Pin 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Comp) | Compensation node | Output of error amplifier; connects to RC network for loop stability - clamping below 150 mV enables 36 µA standby mode |
| Pin 2 (FB) | Voltage feedback input | Monitors regulated output via resistive divider; threshold = 5.05 V ±2%; not internally connected to reference |
| Pin 3 (GND) | Power and signal ground | Common return for internal circuits and external components; electrically tied to heatsink tab |
| Pin 4 (VCC) | Power supply input | Accepts 7.5–40 V; powers internal circuitry and gate drive; UVLO active below 5.9 V |
| Pin 5 (SW) | Switch collector output | High-current NPN transistor collector; drives external inductor; rated for 40 V max and 5.0 A continuous |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A switch | Eliminates need for external power transistor in ≤5 A step-down/inverting designs |
| Fixed 72 kHz oscillator | Reduces external timing component count; enables predictable EMI filtering and inductor selection |
| 5.05 V ±2% reference | Enables accurate 5.0 V output without trimming; 50 mV offset compensates for typical 1% interconnect drop |
| Cycle-by-cycle current limiting | Provides immediate overcurrent shutdown per switching cycle - prevents MOSFET/fuse failure during short-circuit events |
| Standby mode (36 µA) | Supports low-power sleep states in battery-backed systems by disabling PWM while retaining regulation readiness |
Applications
| Automotive Body Control Module | Industrial 24 V to ±12 V Power Supply |
|---|---|
|
Use Scenario: Regulating 24 V vehicle battery to stable 5 V for microcontroller and 12 V for actuators in door modules. IC Role / Device Role / Timing Role: Primary step-down controller with integrated 5 A switch; operates at 72 kHz to minimize filter size in space-constrained modules. Use Value: Single-chip solution eliminates external MOSFET and driver, reducing BOM count and PCB area by >30% vs discrete alternatives. |
Use Scenario: Generating isolated ±12 V rails from 24 V industrial bus for op-amp signal conditioning and analog I/O. IC Role / Device Role / Timing Role: Configured in voltage-inverting topology (Fig. 23); uses internal 5.05 V reference to regulate negative output via feedback inversion. Use Value: Achieves −12 V @ 1.7 A with 79.5% efficiency at 12 V input - avoids need for dual-output transformer or separate inverter IC. |
| Off-Line AC/DC Preconverter | Brushed DC Motor Speed Controller |
|
Use Scenario: 125 W offline preconverter stepping 115 VAC down to 24 V for downstream MC33167D2T post-regulators in distributed power systems. IC Role / Device Role / Timing Role: Post-regulator in multi-rail system; accepts 24 V input and delivers tightly regulated outputs with <0.03% line regulation. Use Value: Enables modular, isolated power architecture - each MC33167D2T handles independent load with no cross-regulation issues. |
Use Scenario: Variable-speed control of 18 V brushed motor using EMF feedback to maintain constant RPM across load and supply variations. IC Role / Device Role / Timing Role: PWM controller modulating switch duty cycle based on back-EMF sensing; leverages 0–95% duty range for full speed control. Use Value: Delivers ±1% speed regulation over 12–24 V input range - eliminates need for closed-loop tachometer or encoder feedback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34167D2TR4G | Same silicon, but rated for 0°C to +70°C ambient - lacks extended industrial temperature qualification | Not suitable for under-hood automotive or uncooled industrial enclosures above +70°C | Select only for commercial-grade applications where ambient stays ≤70°C |
| LM2596S-5.0 | 3 A switch current, 150 kHz fixed frequency, integrated synchronous rectification - lower current, higher frequency, different compensation structure | Requires redesign of inductor (smaller), output capacitor (lower ESR), and feedback network; no inverting mode support | Choose for cost-sensitive 3 A designs needing smaller magnetics; avoid for >3 A or inverting topologies |
Compared with MC33167D2T, MC34167D2TR4G shares identical electrical performance but sacrifices industrial temperature range, while LM2596S-5.0 trades current capability and topology flexibility for higher integration and smaller passive components - making it viable only for lower-power, non-inverting applications.
Availability
MC33167D2T is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V power supplies, off-line preconverters, and brushed motor controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33167D2T 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 MC33167 series was engineered specifically for robust, low-component-count dc-dc conversion in harsh environments - emphasizing thermal resilience, wide input range, and flexible topology support (step-down/inverting/step-up-down) for automotive and industrial power systems.
FAQ
What is the maximum continuous output current supported by the MC33167D2T?
The MC33167D2T integrates a high-current NPN switch rated for 5.0 A continuous collector current. This is validated across its full operating temperature range (−40°C to +85°C) with appropriate heatsinking. Peak switch current limit is 6.5 A typical, with cycle-by-cycle protection preventing damage during transient overloads. The MC33167D2T achieves this without external MOSFETs in step-down or inverting configurations.
Can the MC33167D2T be used in a voltage-inverting configuration?
Yes, the MC33167D2T is explicitly designed for voltage-inverting applications, as confirmed in Figures 23 and 12 of the official datasheet. It requires connecting the IC's GND pin (Pin 3) to the negative output rail, which reverses the error amplifier's effective inputs and keeps the switch emitter within safe voltage limits. The MC33167D2T delivers −12 V at 1.7 A with 79.5% efficiency in this configuration.
What is the purpose of the 5.05 V reference voltage in the MC33167D2T?
The MC33167D2T features a precision 5.05 V ±2% internal reference to serve as the feedback threshold for output regulation. It is intentionally set 50 mV above 5.0 V to compensate for typical 1% voltage drop across cables and connectors - ensuring the actual load receives exactly 5.0 V. This reference is not pinned out but biases the error amplifier's non-inverting input internally.
Does the MC33167D2T support standby or low-power mode?
Yes, the MC33167D2T supports a low-power standby mode that reduces supply current to 36 µA. This is activated by clamping the compensation pin (Pin 1) voltage below 150 mV - for example, using a transistor or logic signal. In this state, the PWM latch is disabled while maintaining regulation readiness, enabling energy savings in battery-powered or sleep-mode systems without losing output voltage setting.
What package type and thermal characteristics does the MC33167D2T use?
The MC33167D2T is housed in a D2PAK (TO-263) surface-mount package (Case 936A) with an exposed metal pad electrically connected to Pin 3 (GND). Its thermal resistance is θJA = 70°C/W (on 1-inch² 2-oz copper) and θJC = 5.0°C/W, enabling efficient heat transfer to the PCB. The package is Pb-free and moisture sensitivity level (MSL) 1 - suitable for standard reflow processes without baking.
MC33167D2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
MC33167D2T FAQ
1.How can I place an order for MC33167D2T through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33167D2T 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 MC33167D2T reliable?
The price and inventory of MC33167D2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33167D2T is usually 5 days.
3.What payment methods are accepted for MC33167D2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33167D2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33167D2T?
MC33167D2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33167D2T 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 MC33167D2T?
For technical support, including MC33167D2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33167D2T requirements.
6.How does Aetrix verify that MC33167D2T is sourced from the original manufacturer or authorized distributors?
All MC33167D2T 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 MC33167D2T meets industry standards.
7.What is the process for return or replacement of MC33167D2T?
All MC33167D2T units undergo pre-shipment inspection (PSI). If there is an issue with MC33167D2T, 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 MC33167D2T part is unused and in its original packaging.
Return procedure for MC33167D2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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