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Texas Instruments LM2674N-5.0/NOPB
- Part No.:
- LM2674N-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2674N-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:202
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Product details
Overview
LM2674N-5.0/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering 500mA output current with ±1.5% output voltage tolerance, 260kHz fixed switching frequency, and 8V–40V input range - used as a primary buck regulator in industrial power supplies and embedded systems requiring stable 5V rail generation.
For engineers reviewing the LM2674N-5.0/NOPB datasheet, LM2674N-5.0/NOPB pinout, LM2674N-5.0/NOPB application, or LM2674N-5.0/NOPB equivalent, key selection criteria include its fixed 5V output, SOIC-8 package thermal performance (RθJA = 105°C/W), 0.25Ω internal DMOS switch RDS(ON), TTL-compatible shutdown capability, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2674N-5.0/NOPB integrates a high-side DMOS switch, internal 260kHz oscillator, and patented frequency compensation - eliminating need for external compensation components. Its feedback loop regulates output by comparing FB pin voltage to an internal 1.21V reference, but for the fixed-5V version, FB is internally connected to VOUT so no external divider is required.
It operates in continuous conduction mode with cycle-by-cycle current limiting (typ. 0.8A limit), thermal shutdown, and low-power standby mode (50μA quiescent current). The SOIC-8 package uses exposed copper traces as sole heatsink due to >90% efficiency at full load - no external heatsink needed under typical PCB layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% over line/load/temperature - eliminates need for feedback resistor network and ensures stable logic supply rail. |
| Max Output Current | 500mA DC - supports mid-power microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 8V to 40V - enables direct use with unregulated 12V/24V industrial bus rails and battery-backed systems. |
| Switching Frequency | 260kHz fixed - allows compact LC filter design with standard 47μH inductors and reduces EMI compared to lower-frequency alternatives. |
| RDS(ON) | 0.25Ω (typ.) - minimizes conduction loss and enables >90% efficiency at 500mA with 12V input. |
| Shutdown Current | 50μA (typ.) - supports low-power sleep modes in battery-operated equipment without compromising wake-up latency. |
| Oscillator Tolerance | ±10% - ensures predictable filter sizing and avoids resonant coupling with system clocks or communication buses. |
Pinout & Package
LM2674N-5.0/NOPB is supplied in an 8-pin SOIC (D) package (4.9mm × 6mm) with exposed pad not present - thermal management relies on PCB copper area per JEDEC MO-153. Pin functions are validated per TI SNVS007I Rev JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap capacitor connection | Connects 10nF ceramic capacitor between CB and VSW to drive high-side DMOS gate - critical for proper switch turn-on and efficiency. |
| 4 - FB | Feedback sense input | Internally tied to output for fixed-5V version - no external resistors required; floating or misconnection causes regulation failure. |
| 5 - ON/OFF | Enable control input | TTL-compatible; ≥1.4V enables operation, ≤0.8V disables with 50μA standby draw - supports microcontroller GPIO control. |
| 6 - GND | Power ground | Main return path for input/output capacitors and inductor - must be short, low-impedance trace to minimize noise and thermal rise. |
| 7 - VIN | Input supply | Accepts 8–40V DC; requires local 22μF tantalum bypass capacitor placed adjacent to pin to suppress high-frequency ripple. |
| 8 - VSW | Switch node output | Drives external inductor and Schottky catch diode - high dv/dt node requiring tight layout and minimal parasitic capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS switch | 0.25Ω RDS(ON) enables self-contained buck conversion with only 5 external components - reduces BOM count and layout complexity. |
| Fixed-frequency oscillator | 260kHz operation allows consistent EMI filtering and predictable inductor sizing - avoids subharmonic oscillation without slope compensation. |
| Thermal & current protection | Auto-recovering thermal shutdown and cycle-by-cycle current limit (0.62–1.2A range) prevent damage during overload or short-circuit events. |
| Simple PCB layout | SOIC-8 pinout optimized for minimum trace length between VIN, VSW, GND, and CIN/COUT - eliminates need for complex thermal vias or multi-layer routing. |
| WEBENCH® compatibility | Fully supported in TI's WEBENCH Power Designer - generates complete schematics, bill-of-materials, efficiency plots, and thermal simulations for LM2674N-5.0/NOPB designs. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powers 5V logic rails for isolated digital inputs, CAN transceivers, and microcontroller peripherals in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24V DC bus to clean 5V supply - handles transient loads up to 500mA during relay actuation. Use Value: High efficiency (>90%) prevents thermal derating in enclosed enclosures; 40V max input accommodates load-dump transients without external clamping. |
Use Scenario: Supplies 5V to microcontrollers, LIN transceivers, and sensor interfaces in automotive body electronics modules operating from 12V battery with cold-crank down to 6.5V. IC Role / Device Role / Timing Role: Pre-regulator stepping down battery voltage before LDOs - delivers stable 5V even during cranking when input dips to 6.5V. Use Value: Wide 8–40V input range covers cold-crank (6.5V min operating) and load-dump (45V abs max) conditions; ±1.5% output tolerance meets AEC-Q100 functional safety margins. |
| Medical Point-of-Care Device | Test & Measurement Equipment |
|
Use Scenario: Generates 5V rail for ARM-based processor, ADC front-end, and USB interface in portable diagnostic instruments powered by Li-ion battery packs (8.4–12.6V). IC Role / Device Role / Timing Role: Main DC-DC converter enabling battery-powered operation with >10-hour runtime - switches at fixed 260kHz to avoid interference with sensitive analog signal chains. Use Value: 50μA shutdown current extends battery life in standby; 0.25Ω RDS(ON) minimizes heat generation near temperature-sensitive biosensors. |
Use Scenario: Provides regulated 5V supply for FPGA configuration, precision DACs, and serial communication ICs in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Low-noise intermediate regulator feeding LDOs - maintains tight output tolerance across wide temperature range (–40°C to +125°C junction). Use Value: ±1.5% output tolerance over full temp/load ensures accurate reference voltage generation; SOIC-8 package allows manual rework and prototyping flexibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574H-5.0 | Higher 60V input rating, 52kHz switching frequency, larger external components required - 3× footprint vs. LM2674N-5.0/NOPB. | Better suited for high-input-voltage industrial systems where 40V limit is insufficient; lower frequency increases inductor size and reduces EMI filtering complexity. | Select LM2574H-5.0 only if input exceeds 40V or legacy 52kHz EMI profile is required; otherwise LM2674N-5.0/NOPB offers superior efficiency and smaller solution size. |
| TPS54302DDAR | Synchronous buck, 2.5–6V input, 3A output, 2.5MHz switching - requires different input voltage domain and higher component count. | Designed for low-input-voltage, high-current applications (e.g., point-of-load from 3.3V/5V rails); incompatible with 12V+ input sources. | Choose TPS54302DDAR only for 3–6V input systems needing >500mA; LM2674N-5.0/NOPB remains optimal for 8–40V industrial/mid-power use cases. |
Compared with LM2574H-5.0, LM2674N-5.0/NOPB delivers higher efficiency and smaller magnetics at 260kHz, while TPS54302DDAR targets entirely different input ranges and current levels - making LM2674N-5.0/NOPB the only drop-in replacement for fixed 5V, 8–40V, 500mA buck applications in SOIC-8.
Availability
LM2674N-5.0/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical diagnostics devices, and test equipment requiring stable component supply with long-term manufacturability and RoHS-compliant packaging.
Supply support for LM2674N-5.0/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - engineered for ease-of-use in cost-sensitive, medium-power DC-DC conversion applications where reliability, minimal external components, and fast time-to-market are critical.
FAQ
What is the maximum input voltage rating for LM2674N-5.0/NOPB?
The absolute maximum input voltage for LM2674N-5.0/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe operating area limits and may trigger internal protection circuits. For sustained reliability in 24V industrial systems with load-dump transients, external TVS clamping is advised to hold VIN ≤40V.
Does LM2674N-5.0/NOPB require external feedback resistors?
No - LM2674N-5.0/NOPB is the fixed 5V output variant, so the FB pin is internally connected to the output. External resistors are unnecessary and must not be added; connecting them will disrupt regulation. Only adjustable versions (e.g., LM2674MX-ADJ) require an R1/R2 divider network on the FB pin.
What is the thermal resistance (RθJA) of LM2674N-5.0/NOPB in SOIC-8 package?
The junction-to-ambient thermal resistance (RθJA) for LM2674N-5.0/NOPB in SOIC-8 (D) package is 105°C/W, measured with ~1 in² of 2-oz copper on the PCB. This value assumes standard JEDEC 2S2P board layout; adding thermal vias or increasing copper area can reduce RθJA by up to 30%, improving power handling at full 500mA load.
Can LM2674N-5.0/NOPB be synchronized to an external clock?
No - LM2674N-5.0/NOPB uses an internal fixed-frequency 260kHz oscillator and does not support external synchronization. Its timing is fully self-contained, which simplifies design but precludes phase alignment with other switching regulators. For sync-capable alternatives, consider TI's TPS54x02 family or newer LM5164.
What type of catch diode is recommended for LM2674N-5.0/NOPB?
A Schottky diode rated for ≥3.3A peak forward current and ≥50V reverse voltage is recommended - such as the IR 30WQ05F or equivalent. Schottky selection minimizes forward voltage drop (typically 0.4–0.5V), reducing power loss and improving efficiency; fast recovery is essential to handle the 260kHz switching edge without reverse recovery spikes.
LM2674N-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2674N-5.0/NOPB FAQ
1.How can I place an order for LM2674N-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674N-5.0/NOPB 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 LM2674N-5.0/NOPB reliable?
The price and inventory of LM2674N-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2674N-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674N-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674N-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674N-5.0/NOPB?
LM2674N-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674N-5.0/NOPB 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 LM2674N-5.0/NOPB?
For technical support, including LM2674N-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674N-5.0/NOPB requirements.
6.How does Aetrix verify that LM2674N-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674N-5.0/NOPB 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 LM2674N-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674N-5.0/NOPB?
All LM2674N-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674N-5.0/NOPB, 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 LM2674N-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2674N-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2674N-5.0/NOPB Tags
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MC34063EBD-TR
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