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onsemi MC34167TH
- Part No.:
- MC34167TH
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
MC34167TH.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
MC34167TH 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, 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 MC34167TH datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design parameters, package-specific layout guidance, and validated alternative options for stable, high-current DC-DC conversion under 40 V input.
Technical Context
The MC34167TH implements voltage-mode PWM control with an internal 72 kHz oscillator (±10% over temperature), latching PWM comparator, and high-gain error amplifier (80 dB typical gain, 600 kHz unity-gain bandwidth). Its feedback loop references a trimmed 5.05 V bandgap, with VFB threshold ranging 4.95–5.15 V at +25°C.
It features cycle-by-cycle current limiting set at 6.5 A typical, undervoltage lockout with 5.9 V startup threshold and 0.9 V hysteresis, and thermal shutdown activating near 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 |
|---|---|
| Output Switch Current | 5.0 A continuous; supports ≥5.5 A peak conduction without external boost, enabling direct drive of medium-power buck/inverter stages |
| Oscillator Frequency | 72 kHz nominal; fixed internal timing ensures predictable EMI profile and simplifies filter design for 12–24 V input systems |
| Reference Voltage | 5.05 V ±2% at +25°C; internally trimmed and temperature-compensated to maintain regulation accuracy across 0°C to +70°C ambient |
| Input Voltage Range | 7.5 V to 40 V; compatible with 12 V/24 V automotive and industrial rails, including pre-regulated off-line intermediate buses |
| Duty Cycle Range | 0% to 95%; enables deep step-down (e.g., 24 V → 3.3 V) and wide-range inverting outputs (e.g., +12 V → –12 V) |
| Current Limit Threshold | 6.5 A typical; cycle-by-cycle protection prevents MOSFET overstress during short-circuit or overload transients |
| Standby Supply Current | 36 µA at 12 V; achieved by pulling Pin 5 below 150 mV, supporting low-power sleep modes in battery-backed systems |
Pinout & Package
The MC34167TH 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. Leadform is vertical mount, Pb-free (G suffix), MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Ground (GND) | Power ground reference for internal circuits; must be low-impedance connection to minimize noise coupling into error amplifier |
| Pin 2 | Switch Output (SW) | Collector of internal NPN power transistor; connects directly to inductor in buck topology or emitter in inverting configuration |
| Pin 3 | Ground / Heatsink Tab | Common ground terminal and thermal path; electrically tied to metal tab; requires insulated mounting if heatsink is not grounded |
| Pin 4 | Supply Input (VCC) | Primary power input (7.5–40 V); powers internal bias, oscillator, and gate drive; bypass capacitor mandatory at pin |
| Pin 5 | Compensation / Feedback Output | Error amplifier output; used for loop compensation (RC network to GND) and standby control (clamp ≤150 mV) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A switch | Eliminates need for external power transistor in ≤5 A buck/inverter designs, reducing BOM count and PCB area |
| Fixed 72 kHz oscillator | Enables consistent EMI filtering and predictable inductor sizing; no external timing resistor required |
| 5.05 V ±2% reference | Supports accurate 5.0 V output without external divider; 50 mV headroom compensates for typical 1% cable drop |
| Cycle-by-cycle current limit | Provides robust short-circuit protection without latch-up, allowing automatic recovery after fault removal |
| Undervoltage lockout with hysteresis | Prevents erratic operation during brown-out; 0.9 V hysteresis avoids oscillation near 5.9 V startup threshold |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Regulating 12 V battery input to stable 5 V for microcontroller, CAN transceiver, and sensor interface circuitry in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary step-down controller; provides regulated 5 V rail with built-in current limiting and thermal protection for harsh under-hood environments. Use Value: Eliminates need for external MOSFET and reduces component count by 4–6 parts versus discrete switcher solutions, improving reliability and qualification time. | Use Scenario: Generating isolated ±12 V rails from a 24 V industrial bus to power analog input/output signal conditioning circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage-inverting regulator core; configured per Figure 23 to deliver clean –12 V/1.7 A with <78 mVpp ripple at full load. Use Value: Achieves tight line/load regulation (±0.61%/±0.020%) without optocoupler feedback, simplifying isolation design while meeting IEC 61000-4 immunity requirements. |
| Off-Line AC/DC Preconverter | Brushed DC Motor Speed Control |
Use Scenario: Serving as post-regulator in a two-stage AC/DC supply where a flyback preconverter delivers 24 V to multiple MC34167TH-based outputs. IC Role / Device Role / Timing Role: Secondary-side DC-DC controller; leverages fixed 72 kHz frequency to synchronize with primary-side 50 kHz self-oscillating stage for reduced inter-stage noise coupling. Use Value: Enables independent, tightly regulated outputs (e.g., +5 V/3 A, +12 V/250 mA, –12 V/200 mA) with 84.2% total efficiency and <75 mVpp ripple - critical for mixed-signal industrial systems. | Use Scenario: Controlling speed of 18 V brushed DC motors in factory automation equipment using EMF feedback for closed-loop RPM regulation. IC Role / Device Role / Timing Role: Step-down PWM controller with analog feedback interface; uses motor back-EMF as voltage feedback signal to stabilize speed across varying loads. Use Value: Delivers ±1% line regulation (12–24 V input) at low speed and ±6% at high speed - sufficient for non-critical motion tasks while avoiding costly encoder-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33167D2TG | Same architecture and pinout; rated for –40°C to +85°C operating range vs. MC34167TH's 0°C to +70°C | Suitable for extended-temperature automotive or outdoor industrial deployments where ambient exceeds 70°C | Select MC33167D2TG when full industrial temperature range is required; otherwise MC34167TH offers identical performance at lower cost. |
| LM2596-5.0 | Fixed 5.0 V output (non-adjustable), 3 A switch current, 150 kHz switching frequency; lacks inverting capability and standby mode | Limited to step-down only; no support for negative output or ultra-low quiescent current modes | Choose LM2596-5.0 only for simple, low-cost 5 V/≤3 A buck supplies where inverting or standby features are unnecessary. |
Compared with MC33167D2TG, the MC34167TH trades extended temperature rating for cost advantage in commercial-grade applications; compared with LM2596-5.0, it delivers higher current, inverting topology support, and µA-level standby - making it superior for multi-rail, thermally constrained, or battery-aware systems.
Availability
MC34167TH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, off-line AC/DC preconverters, and brushed motor control systems requiring stable component supply and long-term manufacturability.
Supply support for MC34167TH 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC34167TH belongs to onsemi's legacy monolithic switching regulator product line, engineered specifically for cost-sensitive, medium-current DC-DC conversion in step-down, inverting, and step-up/down topologies with minimal external components.
FAQ
What is the maximum input voltage supported by the MC34167TH?
The MC34167TH supports a maximum power supply input voltage (VCC) of 40 V, as specified in its Absolute Maximum Ratings table. This allows direct operation from 24 V industrial buses or pre-regulated 36 V intermediate rails. Exceeding 40 V risks permanent damage; for higher-input applications, a front-end pre-regulator or Zener clamp is required before the MC34167TH VCC pin.
Does the MC34167TH support negative output voltage generation?
Yes, the MC34167TH supports voltage-inverting configurations, as demonstrated in Figure 23 of its datasheet. By connecting the IC ground pin to the negative output rail, it enables stable –12 V/1.7 A generation from a +12 V input. The internal 5.05 V reference and error amplifier are reconfigured to regulate the inverted output, achieving ±0.61% line regulation and 79.5% efficiency at full load.
What package type is used for the MC34167TH, and how is thermal management handled?
The MC34167TH uses a 5-lead TO-220 package (Case 314B) with the metal tab internally connected to Pin 3 (Ground). Thermal resistance is θJC = 5.0°C/W and θJA = 65°C/W (free-air). For reliable operation above 2 A, a heatsink such as AAVID 5903B or 5930B is required; the tab must be electrically isolated if the heatsink is not grounded.
Can the MC34167TH be used in step-up (boost) converter topologies?
Yes - the MC34167TH can be used in step-up/down configurations (Figure 21) by adding an external power MOSFET (e.g., MTP3055EL). In this arrangement, the internal switch controls the primary side while the external FET handles higher voltage/current demands. This extends output capability beyond the internal switch's 40 V limit and enables outputs greater than input voltage, with built-in short-circuit protection via the MC34167TH's current sense.
How does the standby mode function on the MC34167TH, and what is its current draw?
The MC34167TH enters low-power standby mode when Pin 5 (Compensation) is clamped to ≤150 mV, reducing supply current to 36 µA at 12 V VCC (Figure 11). This is implemented using an external transistor or logic signal to pull Pin 5 low. Standby mode disables PWM operation and preserves regulation readiness, making it ideal for battery-powered systems requiring periodic wake-up cycles without full shutdown.
MC34167TH 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
MC34167TH FAQ
1.How can I place an order for MC34167TH through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34167TH 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 MC34167TH reliable?
The price and inventory of MC34167TH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167TH is usually 5 days.
3.What payment methods are accepted for MC34167TH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34167TH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34167TH?
MC34167TH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34167TH 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 MC34167TH?
For technical support, including MC34167TH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167TH requirements.
6.How does Aetrix verify that MC34167TH is sourced from the original manufacturer or authorized distributors?
All MC34167TH 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 MC34167TH meets industry standards.
7.What is the process for return or replacement of MC34167TH?
All MC34167TH units undergo pre-shipment inspection (PSI). If there is an issue with MC34167TH, 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 MC34167TH part is unused and in its original packaging.
Return procedure for MC34167TH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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