My Inquiry
My Account
onsemi MC34167D2TR4
- Part No.:
- MC34167D2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MC34167D2TR4.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,967
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC34167D2TR4 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 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 automotive and industrial power supply designs requiring high-current, low-component-count regulation.
For engineers reviewing the MC34167D2TR4 datasheet, pinout, applications, or equivalent options, key selection considerations include its D2PAK package thermal performance (θJC = 5.0 °C/W), 95% max duty cycle, standby mode (36 µA ICC), undervoltage lockout with 0.9 V hysteresis, and compatibility with Schottky rectifiers in flyback-derived configurations.
Technical Context
The MC34167D2TR4 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 (4.1 V peak / 2.3 V valley) that drives a latch-based PWM comparator, ensuring single-pulse metering per cycle.
Cycle-by-cycle current limiting monitors switch conduction via an internal sense resistor and comparator, triggering immediate latch reset at ~6.5 A typical threshold. Undervoltage lockout enables operation only above 5.9 V (with 0.9 V hysteresis), while thermal shutdown activates at ~170 °C to disable the output stage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5.0 A continuous output capability - supports high-power step-down and inverting converters without external boost transistors. |
| Oscillator Frequency | 72 kHz nominal - enables compact magnetics design while maintaining EMI manageability in industrial and automotive environments. |
| Reference Voltage | 5.05 V ±2% at +25°C - provides stable feedback threshold for accurate output regulation; internally trimmed and not externally accessible. |
| Input Voltage Range | 7.5 V to 40 V - accommodates 12 V and 24 V battery systems, including automotive cold-crank and industrial bus rails. |
| Duty Cycle Range | 0% to 95% - allows wide output voltage adjustment in step-down (VOUT < VIN) and inverting (VOUT < 0) topologies. |
| Standby Supply Current | 36 µA at 12 V - enables low-power hold modes by clamping Pin 5 (Compensation) below 150 mV. |
| UVLO Threshold | 5.9 V startup with 0.9 V hysteresis - prevents erratic switching during brown-out conditions and ensures clean power-on sequencing. |
Pinout & Package
The MC34167D2TR4 is housed in a surface-mount D2PAK (Case 936A) package with exposed tab thermally connected to Pin 3 (Ground). The heatsink surface serves as the primary thermal path to PCB copper.
| 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 switch | Drives external inductor; must be paired with fast Schottky diode (e.g., 1N5825); emitter referenced to Pin 3. |
| Pin 3 (Ground) | Power and signal ground reference | Common return for internal circuits, thermal tab, and external components; critical for noise immunity and thermal management. |
| Pin 4 (VCC) | Primary power supply input | Accepts 7.5–40 V; powers internal circuitry and bias networks; requires local 330 µF input capacitor. |
| Pin 5 (Feedback) | Inverting input of error amplifier | Connected to resistor divider from output; senses regulated voltage; internal non-inverting input fixed at 5.05 V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A NPN switch | Eliminates need for external power transistor in ≤5 A step-down/inverting supplies, reducing BOM count and layout complexity. |
| Fixed 72 kHz oscillator | Provides consistent switching frequency without external timing components, simplifying EMI filtering and magnetics selection. |
| Cycle-by-cycle current limiting | Protects switch under overload or short-circuit by terminating each conduction cycle independently - no latch-up or delayed response. |
| Thermal shutdown at ~170°C | Prevents permanent damage during sustained overtemperature; resets automatically upon cooling - not intended as steady-state thermal management. |
| Undervoltage lockout with hysteresis | Ensures reliable start-up only when VCC exceeds 5.9 V and prevents oscillation near threshold via 0.9 V hysteresis window. |
Applications
| Automotive Body Control Module (BCM) Power Supply | Industrial Programmable Logic Controller (PLC) I/O Isolation Rail |
|---|---|
Use Scenario: Generating isolated -12 V rail from 12 V battery for CAN transceiver bias and sensor interface circuitry in harsh automotive environments. IC Role / Device Role / Timing Role: Configured as voltage-inverting regulator with ground pin tied to negative output; regulates output using internal 5.05 V reference and external R1/R2 divider. Use Value: Delivers 1.7 A at -12 V with 79.5% efficiency and 78 mVpp ripple, meeting ASIL-B EMC and thermal requirements without external switch. | Use Scenario: Providing stable +5.0 V/3.0 A main logic rail and auxiliary +12 V/250 mA and -12 V/200 mA rails from 24 V industrial bus in distributed I/O modules. IC Role / Device Role / Timing Role: Used in triple-output flyback-derived topology with shared transformer winding; MC34167D2TR4 controls primary switch while secondary voltages derive from turns ratio. Use Value: Achieves 84.2% total efficiency and ±0.029% line regulation on 5 V rail, enabling compact, cost-effective multi-rail power in space-constrained PLC backplanes. |
| Off-Line AC/DC Preconverter Stage | Brushed DC Motor Speed Control with EMF Feedback |
Use Scenario: Acting as post-regulator in offline SMPS where a self-oscillating flyback preconverter delivers 24 V to multiple MC34167D2TR4 stages for isolated, independently regulated outputs. IC Role / Device Role / Timing Role: Functions as step-down regulator receiving 24 V DC input; leverages fixed 72 kHz frequency to simplify filter design and reduce conducted EMI. Use Value: Enables distributed power architecture with >90% overall system efficiency and independent load regulation across outputs - critical for medical and telecom equipment. | Use Scenario: Regulating motor drive voltage in variable-speed fans or pumps using back-EMF sensing to maintain constant RPM across input voltage variations (12–24 V). IC Role / Device Role / Timing Role: Implements closed-loop speed control by feeding motor EMF into Pin 5 (Feedback) to dynamically adjust duty cycle via error amplifier. Use Value: Achieves ±1% speed regulation at low speed and ±6% at high speed without encoder, reducing system cost versus servo solutions in HVAC and industrial automation. |
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. MC34167D2TR4 (0°C to +70°C); identical electrical specs and pinout. | Suitable for extended-temperature automotive or outdoor industrial deployments where ambient exceeds 70°C. | Select MC33167D2TR4G when temperature robustness is required; otherwise MC34167D2TR4 suffices for commercial-grade applications. |
| LM2596S-5.0 | Fixed 5.0 V output (non-adjustable), lower 3.0 A switch current, 150 kHz switching frequency, integrated bootstrap diode - different topology and feature set. | Better suited for simple, low-cost 5 V point-of-load supplies where adjustable output or inverting capability is unnecessary. | Choose LM2596S-5.0 only for basic step-down applications needing fixed 5 V; MC34167D2TR4 remains preferred for inverting, step-up/down, or higher-current designs. |
Compared with MC33167D2TR4G, the MC34167D2TR4 trades extended temperature range for cost and availability in commercial applications; compared with LM2596S-5.0, it offers greater topology flexibility and higher current, but requires external feedback resistors and rectifier.
Availability
MC34167D2TR4 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, off-line preconverter stages, and brushed motor control systems requiring stable component supply and long-term manufacturability.
Supply support for MC34167D2TR4 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 manufacturer specializing in energy-efficient silicon and power solutions for automotive, industrial, cloud, and IoT applications.
The MC34167 series belongs to onsemi's legacy analog power management portfolio, engineered specifically for high-current, fixed-frequency DC-DC conversion in cost-sensitive and thermally demanding environments.
FAQ
What is the maximum output current supported by the MC34167D2TR4 in step-down configuration?
The MC34167D2TR4 integrates a 5.0 A rated NPN power switch, enabling up to 5.0 A continuous output current in properly heatsinked step-down applications. Actual achievable current depends on PCB copper area, ambient temperature, and input/output voltage differential - for example, at 12 V input and 5 V output, the datasheet demonstrates 5.0 A operation with 78.9% efficiency using AAVID 5903B heatsink.
Can the MC34167D2TR4 be used in voltage-inverting applications, and what is required?
Yes, the MC34167D2TR4 supports voltage-inverting configurations, as validated in Figure 23 of the datasheet. To implement this, the IC's ground pin (Pin 3) must be connected to the negative output rail, reversing the error amplifier's effective inputs. An external Schottky diode (e.g., 1N5825) and inductor are required, and the feedback divider must be referenced to the inverted output to regulate −12 V at 1.7 A.
What is the purpose of Pin 1 (Compensation) on the MC34167D2TR4, and how is it used?
Pin 1 is the error amplifier output and compensation node. It connects to an external RC network (RF and CF) between Pins 1 and 5 to stabilize the control loop. Clamping Pin 1 below 150 mV places the MC34167D2TR4 into low-power standby mode, reducing supply current to 36 µA - a feature used in battery-backed systems to extend hold-up time without disabling regulation.
Does the MC34167D2TR4 require an external timing capacitor, and what sets its switching frequency?
No, the MC34167D2TR4 does not require an external timing capacitor. Its 72 kHz oscillator uses an internal trimmed current source and on-chip capacitor, eliminating external timing components. This fixed frequency simplifies EMI compliance and reduces bill-of-materials versus programmable oscillators, though it limits optimization for ultra-low-noise or high-efficiency boundary conditions.
How does the MC34167D2TR4 handle overcurrent protection, and is it latch-off or cycle-by-cycle?
The MC34167D2TR4 employs cycle-by-cycle current limiting, not latch-off protection. Each switch conduction cycle is independently monitored via internal current-sense resistor and comparator; if the 6.5 A typical threshold is exceeded, the PWM latch resets immediately, terminating that cycle only. This preserves regulation under transient overloads and avoids full shutdown recovery delays seen in latched protectors.
MC34167D2TR4 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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
MC34167D2TR4 FAQ
1.How can I place an order for MC34167D2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34167D2TR4 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 MC34167D2TR4 reliable?
The price and inventory of MC34167D2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167D2TR4 is usually 5 days.
3.What payment methods are accepted for MC34167D2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34167D2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34167D2TR4?
MC34167D2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34167D2TR4 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 MC34167D2TR4?
For technical support, including MC34167D2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167D2TR4 requirements.
6.How does Aetrix verify that MC34167D2TR4 is sourced from the original manufacturer or authorized distributors?
All MC34167D2TR4 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 MC34167D2TR4 meets industry standards.
7.What is the process for return or replacement of MC34167D2TR4?
All MC34167D2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with MC34167D2TR4, 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 MC34167D2TR4 part is unused and in its original packaging.
Return procedure for MC34167D2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC34167D2TR4 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
