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Texas Instruments LM2674N-3.3/NOPB
- Part No.:
- LM2674N-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2674N-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:192
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Product details
Overview
LM2674N-3.3/NOPB from Texas Instruments is a monolithic non-synchronous step-down DC-DC converter delivering 500mA at fixed 3.3V output, with 8V–40V input range, 260kHz fixed-frequency switching, ±1.5% output voltage tolerance, and integrated 0.25Ω DMOS switch. It serves as a primary power conversion stage in industrial control modules requiring stable low-noise 3.3V rails.
For engineers reviewing the LM2674N-3.3/NOPB datasheet, LM2674N-3.3/NOPB pinout, LM2674N-3.3/NOPB application, or LM2674N-3.3/NOPB equivalent, key selection criteria include verified 3.3V fixed-output regulation accuracy, thermal shutdown and current limit protection, SOIC-8 package compatibility, and minimal external component count (5 total) for rapid implementation in space-constrained embedded systems.
Technical Context
The LM2674N-3.3/NOPB implements a voltage-mode PWM control architecture with internal frequency compensation and a fixed 260kHz oscillator. Its feedback loop regulates output by comparing FB pin voltage to an internal 1.21V reference-though for the fixed 3.3V version, FB is internally tied to output, eliminating external resistors.
It operates in active mode when ON/OFF ≥1.4V (typical), drawing 3.6mA quiescent current, and enters shutdown below that threshold with 50μA standby draw. Protection includes cycle-by-cycle current limiting (0.62–1.2A), thermal shutdown, and overvoltage-safe bootstrap capacitor (CB) management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over line/load/temperature - ensures reliable logic-level supply for microcontrollers and FPGAs without trimming. |
| Input Voltage Range | 8V to 40V - supports wide-input industrial and automotive battery-derived supplies without pre-regulation. |
| Max Output Current | 500mA DC - sufficient for powering multiple low-power peripherals (UART transceivers, sensors, ADCs) from one rail. |
| Switching Frequency | 260kHz fixed - enables use of compact, low-ESR inductors (e.g., 68µH) and reduces EMI compared to sub-100kHz converters. |
| RDS(ON) | 0.25Ω (typ) - minimizes conduction loss at full load, contributing to >86% efficiency at 12VIN/3.3VOUT/500mA. |
| Quiescent Current | 3.6mA (active), 50μA (shutdown) - balances light-load efficiency and fast wake-up response in duty-cycled systems. |
| Protection Features | Thermal shutdown, current limit, and under-voltage lockout - eliminates need for external fault-handling circuitry in harsh environments. |
Pinout & Package
LM2674N-3.3/NOPB is supplied in an 8-pin SOIC (D) package (4.9mm × 6mm), with exposed pad not present - thermal dissipation relies on PCB copper area per RθJA = 105°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 10nF ceramic capacitor to VSW to gate-drive the internal high-side DMOS switch; critical for proper switch turn-on. |
| FB (Pin 4) | Feedback sense input | Internally connected to output for fixed 3.3V version - no external divider required; simplifies layout and improves stability. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible enable: ≥1.4V = active; ≤0.8V = shutdown with 50μA IQ; floating defaults to ON via internal pull-up. |
| VSW (Pin 8) | Switch node output | Drain of internal high-side FET - connects directly to inductor and Schottky catch diode cathode; high dv/dt node requiring tight layout. |
| GND (Pin 6) | Power ground | Main return path for input/output capacitors and IC substrate - must be short, low-impedance trace to minimize noise and thermal resistance. |
| VIN (Pin 7) | Input supply | High-side FET collector input - accepts 8–40V; requires local 22µF tantalum bypass capacitor with shortest possible path to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external resistor network, reducing BOM count and layout sensitivity while guaranteeing ±1.5% regulation across temperature and load. |
| 260kHz fixed-frequency operation | Enables predictable EMI filtering and consistent inductor sizing - avoids subharmonic oscillation issues common in variable-frequency controllers. |
| Integrated 0.25Ω DMOS switch | Reduces external component count and PCB footprint versus external-FET buck controllers; supports full 500mA load without heatsinking. |
| TTL shutdown with 50μA standby | Allows system-level power sequencing and low-power sleep modes - compatible with standard logic outputs without level-shifting. |
| Patented internal compensation | Permits stable operation with standard off-the-shelf inductors and capacitors - no loop compensation calculations or external components needed. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated CAN transceivers, analog sensor front-ends, and digital I/O drivers within DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting 24V rail to logic-compatible voltage for microcontroller peripherals and communication interfaces. Use Value: Delivers 500mA with <1.5% output variation across –40°C to +85°C ambient, ensuring deterministic timing and signal integrity in noisy factory-floor environments. | Use Scenario: Supplying 3.3V to door module MCUs, LIN transceivers, and LED driver ICs in 12V vehicle electrical systems with cold-crank (6.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Robust buck converter handling wide input excursions while maintaining regulated output during engine start-stop cycles. Use Value: 8V–40V input range and thermal/current protection prevent brownouts or latch-up during battery voltage sag or surge events. |
| Medical Patient Monitor Subsystem | Point-of-Sale Terminal Power Rail |
Use Scenario: Generating clean 3.3V for low-noise ADCs, touch-screen controllers, and wireless BLE modules in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-quiescent, fixed-output DC-DC stage minimizing heat generation and enabling battery-operated runtime extension. Use Value: 3.6mA active IQ and 50μA shutdown current reduce average power draw, extending single-cell Li-ion battery life between charges. | Use Scenario: Providing stable 3.3V to ARM-based payment processors, display drivers, and secure element ICs in retail kiosks powered from unregulated 12V wall adapters. IC Role / Device Role / Timing Role: Cost-optimized, easy-to-layout buck regulator replacing linear regulators to eliminate thermal derating concerns. Use Value: Requires only five external components (inductor, diode, two caps, bootstrap cap) - accelerates design validation and reduces assembly cost vs. multi-chip solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675M-3.3 | Same topology and pinout, but in MSOP-8 package with improved thermal performance (RθJA = 85°C/W) and tighter ±1.0% output tolerance. | Better suited for thermally constrained PCBs or higher ambient temperatures where SOIC-8 thermal resistance may limit output current. | Select LM2675M-3.3 when board space allows MSOP-8 and junction temperature margin is critical above 85°C ambient. |
| TPS54332DR | Synchronous buck controller (no external diode needed), 3.5–28V input, 3.3V fixed output, 3A capability, adjustable frequency (100kHz–2.5MHz). | Higher current, higher efficiency (>92%), and smaller solution size - but requires more complex layout and lacks integrated diode drive. | Choose TPS54332DR for next-generation designs needing >500mA, higher efficiency, or frequency tuning - not a drop-in replacement due to different pinout and control scheme. |
Compared with LM2674N-3.3/NOPB, LM2675M-3.3 offers enhanced thermal and accuracy specs in a smaller footprint, while TPS54332DR delivers significantly higher current and efficiency at the cost of design complexity and non-pin-compatibility - making LM2674N-3.3/NOPB optimal for cost-sensitive, thermally moderate, fixed-3.3V legacy upgrades.
Availability
LM2674N-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for LM2674N-3.3/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, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2674 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers seeking robust, easy-to-implement DC-DC solutions with minimal external components and proven field reliability in industrial and automotive applications.
FAQ
What is the maximum input voltage rating for LM2674N-3.3/NOPB?
The absolute maximum input voltage for LM2674N-3.3/NOPB is 45V, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe operating area limits and may trigger overvoltage protection or cause permanent damage. For automotive cold-crank scenarios down to 6.5V, the device remains functional but requires verification of minimum duty cycle and dropout behavior per Figure 5-13.
Does LM2674N-3.3/NOPB require external feedback resistors?
No, LM2674N-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its internal feedback network is trimmed to deliver 3.3V ±1.5%, and the FB pin is internally connected to the output. External resistor networks are only needed for the adjustable version (LM2674MX-ADJ); adding them to LM2674N-3.3/NOPB will disrupt regulation.
What type of diode should be used with LM2674N-3.3/NOPB?
A Schottky rectifier rated for ≥3.3A peak current and ≥50V reverse voltage is recommended for LM2674N-3.3/NOPB - such as the IR 30WQ05F cited in the datasheet. Schottky diodes minimize forward voltage drop and switching losses, directly improving efficiency and thermal performance. Fast-recovery PN diodes are not advised due to higher conduction loss and reverse recovery spikes.
Can LM2674N-3.3/NOPB be synchronized to an external clock?
No, LM2674N-3.3/NOPB cannot be synchronized to an external clock. It uses an internal fixed-frequency 260kHz oscillator with ±10% tolerance over temperature. Synchronization capability is absent from the pinout and functional description - pins are dedicated to VIN, GND, VSW, FB, ON/OFF, and CB only. For sync-capable alternatives, consider TI's TPS54332 or TPS62130 families.
Is LM2674N-3.3/NOPB RoHS compliant and lead-free?
Yes, LM2674N-3.3/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per JEDEC J-STD-609, and the device meets EU RoHS Directive 2011/65/EU requirements. It is manufactured using TI's green packaging process and carries full material declarations available via TI.com's product folder.
LM2674N-3.3/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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2674N-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2674N-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2674N-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2674N-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2674N-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2674N-3.3/NOPB?
LM2674N-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2674N-3.3/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-3.3/NOPB?
For technical support, including LM2674N-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2674N-3.3/NOPB requirements.
6.How does Aetrix verify that LM2674N-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2674N-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2674N-3.3/NOPB?
All LM2674N-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2674N-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2674N-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2674N-3.3/NOPB Tags
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