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onsemi MC34167THG
- Part No.:
- MC34167THG
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
MC34167THG.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,612
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Product details
Overview
MC34167THG from onsemi is a fixed-frequency voltage-mode switching regulator IC designed for step-down, voltage-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 and industrial power supplies.
For engineers reviewing the MC34167THG datasheet, pinout, applications, or equivalent options, this page provides verified functional context, validated package mapping (TO-220, 5-lead), confirmed pin roles, real-world converter configurations (step-down/inverting/step-up-down), and two technically documented alternative parts with explicit parameter-level differences.
Technical Context
The MC34167THG implements voltage-mode 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 latching PWM comparator, enabling up to 95% duty cycle with cycle-by-cycle current limiting.
Protection circuitry includes undervoltage lockout with 5.9 V startup threshold and 0.9 V hysteresis, thermal shutdown at ~170 °C, and standby mode activation when Pin 5 (Compensation) is clamped below 150 mV - reducing supply current to 36 µA at 12 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Switch Current | 6.5 A typical peak limit - enables robust 5 A continuous load handling with margin against transient overloads |
| Oscillator Frequency | 72 kHz nominal - fixed frequency simplifies EMI filtering and magnetics design for cost-sensitive industrial converters |
| Reference Voltage | 5.05 V ±2% at +25 °C - precision threshold enables accurate 5.0 V output without external divider in basic step-down designs |
| Input Voltage Range | 7.5 V to 40 V - supports wide-input 12 V/24 V automotive and industrial bus systems with headroom for transients |
| Duty Cycle Range | 0% to 95% - allows deep step-down ratios and accommodates high-dropout rectifier losses in inverting topologies |
| Standby Supply Current | 36 µA at 12 V - ultra-low quiescent current enables energy-efficient sleep modes in battery-backed systems |
| UVLO Threshold | 5.9 V startup with 0.9 V hysteresis - prevents erratic operation during brownout conditions and ensures clean power-on sequencing |
Pinout & Package
MC34167THG is housed in a Pb-free 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (Ground). The heatsink surface serves as terminal 6 in mechanical drawings but is internally tied to Pin 3.
| 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 activates 36 µA standby mode |
| Pin 2 (Switch Output) | Collector of internal NPN power transistor | Drives external inductor; rated for −2.0 V to +Vin; requires Schottky rectifier (e.g., 1N5825) for efficient flyback recovery |
| Pin 3 (Ground) | Power and signal reference common | Internally bonded to heatsink tab; must be low-impedance connection to minimize noise and thermal resistance |
| Pin 4 (VCC) | Primary power supply input | Accepts 7.5–40 V; powers internal circuitry and oscillator; UVLO monitors this pin for startup/shutdown |
| Pin 5 (Feedback) | Inverting input of error amplifier | Internally referenced to 5.05 V; used with resistor divider to set output voltage; 0.15 µA bias current affects high-R dividers |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A switch with <1.8 V saturation | Reduces external component count in step-down/inverting converters; eliminates need for external driver and MOSFET |
| Fixed 72 kHz oscillator with on-chip capacitor | Eliminates external timing resistor/capacitor; ensures consistent switching frequency across temperature and unit variance |
| 0–95% duty cycle control | Supports wide output voltage ranges including negative outputs and high-ratio step-down without external duty cycle clamp |
| Cycle-by-cycle current limiting | Provides instantaneous overcurrent protection per switching cycle - critical for reliability in short-circuit or overload events |
| Thermal shutdown with automatic recovery | Disables output at ~170 °C junction temperature; resumes operation after cooldown - prevents permanent damage without system reset |
Applications
| Automotive Body Control Module (BCM) Power | Industrial 24 V to ±12 V Dual Rail Supply |
|---|---|
|
Use Scenario: Generating regulated 5.0 V for microcontrollers and sensors from noisy 12 V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: Step-down regulator with integrated switch; uses 72 kHz fixed frequency for predictable EMI filtering and compact magnetics. Use Value: Eliminates external MOSFET and gate driver; 5.05 V reference ensures stable MCU core voltage despite battery sag to 7.5 V. |
Use Scenario: Providing isolated ±12 V rails for op-amp signal conditioning in PLC I/O modules powered from 24 V DC bus. IC Role / Device Role / Timing Role: Voltage-inverting regulator (Pin 3 grounded to negative output); leverages 95% max duty cycle for efficient -12 V generation. Use Value: Single IC replaces dual converters; internal current limit protects against field-wiring faults; thermal shutdown guards against enclosure overheating. |
| Off-Line AC-DC Preconverter Stage | Brushed DC Motor Speed Controller |
|
Use Scenario: 24 V intermediate bus generation from rectified AC line via self-oscillating flyback preconverter feeding multiple MC34167THG post-regulators. IC Role / Device Role / Timing Role: Post-regulator in distributed power architecture; operates in step-down mode with tight line/load regulation (±0.039%). Use Value: Enables independent, high-accuracy outputs (5 V, 12 V, −12 V) with shared magnetics; 84.2% total efficiency reduces thermal load in enclosed systems. |
Use Scenario: Variable-speed control of 18 V brushed motor using EMF feedback to maintain RPM under varying mechanical load. IC Role / Device Role / Timing Role: Step-down controller modulating average motor voltage; uses error amplifier for closed-loop speed regulation. Use Value: Internal 5.05 V reference stabilizes feedback scaling; 72 kHz switching minimizes audible noise; standby mode cuts idle current in parked state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33167D2TG | Wider operating temperature range (−40 °C to +85 °C) vs. MC34167THG (0 °C to +70 °C); identical electrical specs and pinout | Suitable for under-hood automotive or outdoor industrial environments requiring extended thermal tolerance | Select MC33167D2TG when ambient exceeds +70 °C; otherwise MC34167THG offers same performance at lower cost for commercial-grade applications |
| LM2596-5.0 | Fixed 5.0 V output (non-adjustable), 3.0 A switch current, 150 kHz switching - lacks inverting/step-up-down capability and 5.05 V reference trim | Limited to basic step-down only; no support for negative outputs or external duty cycle extension beyond 85% | Choose LM2596-5.0 only for simple 5 V point-of-load where adjustability, inverting topology, and >3 A load are unnecessary |
Compared with MC34167THG, MC33167D2TG extends thermal range without trade-offs, while LM2596-5.0 sacrifices topology flexibility and output accuracy for integration simplicity - making MC34167THG optimal for multi-topology, precision-voltage, and industrial-temp designs.
Availability
MC34167THG is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, off-line AC-DC power supplies, and brushed motor control systems requiring stable component supply and long-term manufacturability.
Supply support for MC34167THG 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power markets.
The MC34167THG belongs to onsemi's legacy monolithic switching regulator product line, engineered for cost-effective, high-reliability DC-DC conversion in automotive and industrial applications where fixed-frequency control and integrated protection are essential.
FAQ
What is the maximum output current capability of the MC34167THG?
The MC34167THG features an internal NPN power switch with a typical current limit threshold of 6.5 A and guaranteed minimum of 5.5 A. In practical step-down designs with adequate heatsinking (e.g., AAVID 5903B), it reliably delivers 5.0 A continuous output current. Peak transient capability reaches 8.0 A per datasheet limits, but sustained operation above 5.0 A requires careful thermal design due to package power dissipation constraints.
Can the MC34167THG be used to generate a negative output voltage?
Yes, the MC34167THG is explicitly designed for voltage-inverting configurations, as shown in Figure 23 of its datasheet. By connecting Pin 3 (Ground) to the negative output rail, the internal error amplifier adapts to regulate negative voltage. The device supports −12 V/1.7 A operation with 79.5% efficiency at 12 V input, using standard components like 1N5825 Schottky diodes and 190 µH inductors.
Does the MC34167THG require external timing components for oscillator operation?
No, the MC34167THG incorporates an on-chip oscillator with internal timing components, operating at a fixed 72 kHz nominal frequency. Unlike many controllers, it does not require external resistors or capacitors to set switching frequency - simplifying BOM and layout. The oscillator's 4.1 V/2.3 V ramp thresholds and charge/discharge ratio are factory-trimmed for stability across temperature and process variation.
What protection features are built into the MC34167THG?
The MC34167THG integrates three primary protections: cycle-by-cycle current limiting (triggering at 6.5 A typical), undervoltage lockout with 5.9 V startup and 0.9 V hysteresis, and thermal shutdown activating near 170 °C. Additionally, it supports low-power standby mode (36 µA ICC) when Pin 5 is clamped below 150 mV - providing system-level energy savings without external circuitry.
Is the MC34167THG pin-compatible with other devices in the MC33167/MC34167 family?
Yes, the MC34167THG shares identical pinout, electrical characteristics, and functional block diagram with MC33167 variants and other MC34167 suffixes (e.g., MC34167TVG, MC34167D2TR4G). All members use the same 5-pin TO-220 or D2PAK footprint and support interchangeable placement in existing designs - differing only in temperature grade, packaging, and shipping format.
MC34167THG 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Horizontal
MC34167THG FAQ
1.How can I place an order for MC34167THG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34167THG 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 MC34167THG reliable?
The price and inventory of MC34167THG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167THG is usually 5 days.
3.What payment methods are accepted for MC34167THG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34167THG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34167THG?
MC34167THG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34167THG 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 MC34167THG?
For technical support, including MC34167THG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167THG requirements.
6.How does Aetrix verify that MC34167THG is sourced from the original manufacturer or authorized distributors?
All MC34167THG 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 MC34167THG meets industry standards.
7.What is the process for return or replacement of MC34167THG?
All MC34167THG units undergo pre-shipment inspection (PSI). If there is an issue with MC34167THG, 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 MC34167THG part is unused and in its original packaging.
Return procedure for MC34167THG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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