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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

onsemi MC34167D2TR4G

Name: MC34167D2TR4G
Brand: onsemi
SKU: MC34167D2TR4G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC34167D2TR4G

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Datasheet:: MC34167D2TR4G.pdf

Description:: IC REG BUCK BST ADJ 5.5A D2PAK-5

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Product details

Overview

MC34167D2TR4G from onsemi is a fixed-frequency voltage-mode switching regulator IC optimized for step-down, 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, latching PWM controller, and thermal/UVLO/current-limit protection. It operates from 7.5 V to 40 V input and delivers stable regulation in automotive power supplies and industrial embedded converters.

For engineers reviewing the MC34167D2TR4G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated D2PAK package details, confirmed application roles in regulated power systems, and two rigorously cross-checked alternative parts with documented functional differences.

Technical Context

The MC34167D2TR4G implements voltage-mode 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 (4.1 V peak / 2.3 V valley) driving a latching PWM comparator that enforces single-pulse-per-cycle operation.

Cycle-by-cycle current limiting monitors switch conduction via an internal sense resistor and comparator, triggering immediate latch reset at ≥6.5 A typical peak current. Undervoltage lockout activates at 5.9 V (±0.3 V hysteresis), and thermal shutdown engages at ~170 °C - both disabling the output stage without requiring external circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Oscillator Frequency	72 kHz nominal (62–79 kHz over temperature); sets minimum inductor size and EMI profile for compact, cost-effective designs.
Output Switch Current	≥5.0 A continuous (6.5 A typical current limit); supports high-current step-down outputs up to 5.0 A without external MOSFETs.
Reference Voltage	5.05 V ±2% at +25 °C; enables precise 5.0 V output without external divider, compensating for typical 1% cable drop.
Input Voltage Range	7.5 V to 40 V; accommodates wide automotive battery ranges (cold-crank to load-dump) and industrial 24 V rails.
Duty Cycle Range	0% to 95%; allows deep step-down (e.g., 40 V → 5 V) and full inversion (e.g., +12 V → −12 V) with margin for component tolerances.
Standby Supply Current	36 µA at 12 V; reduces system quiescent power during sleep modes - critical for always-on automotive modules.
Thermal Shutdown Threshold	~170 °C junction; protects against sustained overload or inadequate heatsinking without external sensors.

Pinout & Package

MC34167D2TR4G uses the surface-mount D2PAK (Case 936A) package with exposed thermal pad connected internally to Pin 3 (Ground). The 5-pin layout supports high-current switching with low-inductance ground return and integrated heatsinking capability.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Comp)	Compensation Node	Connects to RC network (RF/CF) for loop stability; clamping below 150 mV forces standby mode (36 µA ICC).
Pin 2 (Switch)	Switch Output Collector	Drives external inductor; rated for 40 V max, 5.0 A continuous; requires Schottky rectifier (e.g., 1N5825) for flyback recovery.
Pin 3 (GND)	Power & Signal Ground	Common reference for all internal circuits; thermally tied to exposed pad; must be low-impedance copper pour for thermal management.
Pin 4 (VCC)	Supply Input	Accepts 7.5–40 V; powers internal circuitry; UVLO active below 5.9 V; bypass capacitor required near pin.
Pin 5 (FB)	Voltage Feedback Input	Monitors output via resistive divider; threshold = 5.05 V; open-loop gain >80 dB ensures tight regulation under line/load transients.

Key Features

Feature	Design Value
Integrated 5.0 A switch	Eliminates need for external high-current MOSFET in ≤5 A step-down/inverting designs, reducing BOM count and PCB area.
Fixed 72 kHz oscillator	Enables predictable EMI filtering and consistent inductor sizing; eliminates external timing components and associated drift.
5.05 V ±2% reference	Provides factory-trimmed accuracy enabling 5.0 V output with <±0.04% line regulation (4.0 mV over 10–36 V input) in step-down config.
Cycle-by-cycle current limit	Protects switch during short-circuit or overload without foldback; maintains 6.5 A limit across temperature (−40 °C to +70 °C).
Undervoltage lockout w/ hysteresis	Prevents erratic startup by holding output disabled until VCC ≥5.9 V, then releasing only when VCC drops to ≤5.0 V (0.9 V hysteresis).

Applications

Automotive Body Control Module (BCM)	Industrial Programmable Logic Controller (PLC) I/O Power
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 regulator with integrated 5.0 A switch; 72 kHz switching enables compact LC filter; UVLO prevents brownout resets during cranking. Use Value: Single-chip solution eliminates external MOSFET and gate driver; ±2% reference ensures CAN bus compliance; 36 µA standby extends battery life in sleep mode.	Use Scenario: Generating isolated 5 V and −12 V rails from 24 V DC supply for analog input conditioning and digital logic in modular PLC backplanes. IC Role / Device Role / Timing Role: Dual-role regulator: configured as step-down for +5 V and inverting for −12 V; shared 72 kHz clock simplifies EMI filtering across multiple outputs. Use Value: Enables dual-polarity outputs with one IC and common compensation network; 95% max duty cycle supports wide input range (18–32 V) without dropout.
Off-Line AC/DC Preconverter Stage	Brushed DC Motor Speed Control
Use Scenario: Post-regulation stage in 125 W offline SMPS where transformer-derived 24 V feeds MC34167D2TR4G for precise +5 V output to digital control circuitry. IC Role / Device Role / Timing Role: Secondary-side voltage-mode controller; handles line/load transients with 80 dB error amp gain; thermal shutdown guards against transformer saturation faults. Use Value: Replaces linear regulators in high-efficiency designs; 78.9% efficiency at 5 V/5 A reduces heatsink requirements; D2PAK package aids thermal coupling to chassis.	Use Scenario: Closed-loop speed regulation of 18 V brushed motor using back-EMF sensing, where MC34167D2TR4G drives H-bridge FETs via PWM interface. IC Role / Device Role / Timing Role: Fixed-frequency PWM generator with adjustable duty cycle (0–95%); feedback loop closed via EMF-sensing op-amp into FB pin. Use Value: Eliminates need for separate PWM IC; 72 kHz frequency avoids audible noise; current limit protects motor windings during stall conditions.

Automotive Body Control Module (BCM)

Industrial Programmable Logic Controller (PLC) I/O Power

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 regulator with integrated 5.0 A switch; 72 kHz switching enables compact LC filter; UVLO prevents brownout resets during cranking.

Use Value: Single-chip solution eliminates external MOSFET and gate driver; ±2% reference ensures CAN bus compliance; 36 µA standby extends battery life in sleep mode.

Use Scenario: Generating isolated 5 V and −12 V rails from 24 V DC supply for analog input conditioning and digital logic in modular PLC backplanes.

IC Role / Device Role / Timing Role: Dual-role regulator: configured as step-down for +5 V and inverting for −12 V; shared 72 kHz clock simplifies EMI filtering across multiple outputs.

Use Value: Enables dual-polarity outputs with one IC and common compensation network; 95% max duty cycle supports wide input range (18–32 V) without dropout.

Off-Line AC/DC Preconverter Stage

Brushed DC Motor Speed Control

Use Scenario: Post-regulation stage in 125 W offline SMPS where transformer-derived 24 V feeds MC34167D2TR4G for precise +5 V output to digital control circuitry.

IC Role / Device Role / Timing Role: Secondary-side voltage-mode controller; handles line/load transients with 80 dB error amp gain; thermal shutdown guards against transformer saturation faults.

Use Value: Replaces linear regulators in high-efficiency designs; 78.9% efficiency at 5 V/5 A reduces heatsink requirements; D2PAK package aids thermal coupling to chassis.

Use Scenario: Closed-loop speed regulation of 18 V brushed motor using back-EMF sensing, where MC34167D2TR4G drives H-bridge FETs via PWM interface.

IC Role / Device Role / Timing Role: Fixed-frequency PWM generator with adjustable duty cycle (0–95%); feedback loop closed via EMF-sensing op-amp into FB pin.

Use Value: Eliminates need for separate PWM IC; 72 kHz frequency avoids audible noise; current limit protects motor windings during stall conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar switching regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC33167D2TR4G	Wider operating ambient range (−40 °C to +85 °C) vs. MC34167D2TR4G (0 °C to +70 °C); identical electrical specs and pinout.	Suitable for under-hood automotive or outdoor industrial environments requiring extended temperature operation.	Select MC33167D2TR4G when ambient exceeds +70 °C; otherwise MC34167D2TR4G offers same performance at lower cost.
LM2596S-5.0	Lower output current (3.0 A vs. 5.0 A); different oscillator frequency (150 kHz); no inverting topology support; integrated diode not required.	Limited to step-down only; unsuitable for negative rail generation or >3 A loads; simpler compensation but less flexible.	Choose LM2596S-5.0 for cost-sensitive, low-power step-down only; retain MC34167D2TR4G for multi-topology, high-current, or automotive-grade designs.

Compared with MC33167D2TR4G, the MC34167D2TR4G trades extended temperature range for cost and availability in commercial-grade applications; versus LM2596S-5.0, it delivers 67% higher current, supports inverting/step-up/down topologies, and provides superior thermal protection - making it essential for robust, multi-rail industrial power systems.

Availability

MC34167D2TR4G is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and off-line AC/DC preconverters requiring stable component supply, Pb-free compliance, and tape-and-reel packaging for automated assembly.

Supply support for MC34167D2TR4G 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 MC34167 series belongs to onsemi's legacy power management portfolio, designed specifically for cost-effective, high-reliability DC-DC conversion in automotive and industrial environments where integration, thermal robustness, and topology flexibility are critical.

FAQ

What is the maximum output current capability of the MC34167D2TR4G?

The MC34167D2TR4G features an integrated bipolar output switch rated for ≥5.0 A continuous current. Its cycle-by-cycle current limit is specified at 6.5 A typical (5.5–8.0 A min/max), enabling reliable operation in step-down configurations delivering up to 5.0 A at 5.0 V. Thermal derating applies above +70 °C ambient.

Can the MC34167D2TR4G be used in voltage-inverting applications?

Yes - the MC34167D2TR4G is explicitly designed for voltage-inverting topologies, as confirmed in Figures 23 and 12 of the datasheet. It achieves −12 V/1.7 A output with 79.5% efficiency at 12 V input. The IC's 0–95% duty cycle and internal reference enable stable negative rail generation when the ground pin is connected to the negative output node.

What package type does the MC34167D2TR4G use, and how is thermal management handled?

The MC34167D2TR4G uses the surface-mount D2PAK (Case 936A) package with an exposed thermal pad electrically and thermally connected to Pin 3 (GND). Its junction-to-case thermal resistance is 5.0 °C/W, and recommended PCB layout includes a large copper pour tied to Pin 3 for heatsinking - critical for sustaining 5.0 A output at elevated ambient temperatures.

Does the MC34167D2TR4G require external components for basic step-down operation?

Yes - minimal external components are required: input/output capacitors (Cin, CO), inductor (L), feedback divider (R1/R2 for Vout ≠ 5.05 V), compensation network (RF/CF), and Schottky rectifier (e.g., 1N5825). Figure 19 shows a complete step-down schematic; the IC itself integrates oscillator, reference, error amp, PWM latch, and 5.0 A switch - eliminating need for external driver or timing IC.

How does the standby mode function in the MC34167D2TR4G?

Standby mode is activated by clamping the Compensation pin (Pin 1) to <150 mV, reducing supply current to 36 µA at 12 V - as verified in Figure 11 and Electrical Characteristics table. This feature enables ultra-low-power sleep states in automotive modules. The 100 µA pull-up current source on Pin 5 (Error Amp output) can also be used to implement soft-start by charging an external capacitor.

MC34167D2TR4G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Packaging:: Tape & Reel (TR)

Product Status:: Last Time Buy

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:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK-5

MC34167D2TR4G FAQ

1.How can I place an order for MC34167D2TR4G through Aetrix?

Please submit a Request for Quotation (RFQ) for MC34167D2TR4G 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 MC34167D2TR4G reliable?

The price and inventory of MC34167D2TR4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167D2TR4G is usually 5 days.

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MC34167D2TR4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC34167D2TR4G 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 MC34167D2TR4G?

For technical support, including MC34167D2TR4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167D2TR4G requirements.

6.How does Aetrix verify that MC34167D2TR4G is sourced from the original manufacturer or authorized distributors?

All MC34167D2TR4G 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 MC34167D2TR4G meets industry standards.

7.What is the process for return or replacement of MC34167D2TR4G?

All MC34167D2TR4G units undergo pre-shipment inspection (PSI). If there is an issue with MC34167D2TR4G, 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 MC34167D2TR4G part is unused and in its original packaging.

Return procedure for MC34167D2TR4G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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