My Inquiry
My Account
Texas Instruments LM2671M-3.3/NOPB
- Part No.:
- LM2671M-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2671M-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,627
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2671M-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering a fixed 3.3 V output at up to 500 mA, featuring 260 kHz fixed-frequency operation, ±1.5% output voltage tolerance over line/load/temperature, 0.25 Ω DMOS switch RDS(ON), and wide 6.5–40 V input range. It serves as a high-efficiency primary power stage in industrial power supplies and embedded system rails.
For engineers reviewing the LM2671M-3.3/NOPB datasheet, LM2671M-3.3/NOPB pinout, LM2671M-3.3/NOPB application, or LM2671M-3.3/NOPB equivalent, key selection criteria include its guaranteed 500-mA load capability, soft-start control via external capacitor, TTL-compatible ON/OFF enable, thermal/current-limit protection, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2671M-3.3/NOPB integrates a DMOS power MOSFET switch, fixed-frequency 260 kHz PWM controller, internal frequency compensation, and feedback amplifier with 1.21 V reference. Its architecture uses cycle-by-cycle current limiting and thermal shutdown for fault protection, with duty cycle ranging from 0% to 95%.
It operates in active mode when ON/OFF pin voltage exceeds 1.4 V (typ), drawing 3.6 mA quiescent current, and enters low-power shutdown at ≤0.8 V (min), reducing supply current to 100 μA (max). The FB pin is internally connected to the output for fixed 3.3 V regulation-no external divider required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over full line/load/temperature range - ensures stable logic rail without trimming. |
| Max Output Current | 500 mA continuous - supports microcontroller cores, FPGAs, and peripheral ICs in compact systems. |
| Input Voltage Range | 6.5 V to 40 V - accommodates 12 V/24 V industrial buses and unregulated AC-DC outputs. |
| Switching Frequency | 260 kHz (±10%) - enables use of small, low-cost 22–68 µH inductors and reduces EMI filtering burden. |
| RDS(ON) | 0.25 Ω (typ) at TJ = 25°C - minimizes conduction loss and self-heating under full load. |
| Efficiency | 86% at 12 VIN/500 mA - reduces thermal stress on PCB copper traces, eliminating need for heatsinks. |
| Quiescent Current | 3.6 mA (typ) in active mode; 100 μA (max) in shutdown - supports low-power standby states. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload or short-circuit events. |
Pinout & Package
LM2671M-3.3/NOPB is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed thermal pad not present. Pin functions are validated per TI SNVS008L Rev L (June 2016) datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100 nF ceramic cap to VSW to gate-drive high-side DMOS switch fully ON - critical for efficiency. |
| SS | Soft-start control | Accepts external capacitor to linearly ramp output voltage - prevents inrush current and overshoot at startup. |
| SYNC | Frequency synchronization input | Allows external TTL/CMOS clock >260 kHz to align switching frequency - essential for EMI-sensitive systems. |
| FB | Feedback sense input | Internally tied to output for 3.3 V fixed version - no external resistor network needed; simplifies layout. |
| ON/OFF | Enable/disable control | TTL-compatible input: ≥1.4 V = ON, ≤0.8 V = OFF - enables system-level power sequencing and sleep modes. |
| VSW | Switch node output | Drives external inductor and Schottky diode cathode - high dv/dt node requiring tight loop area and ground plane. |
| GND | Power ground | Dual GND pins (6 & 7) - must connect to low-impedance ground plane; shortest possible path to CIN and COUT. |
| VIN | Input supply | Accepts 6.5–40 V DC - requires local 22 µF tantalum bypass capacitor placed adjacent to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and calibration risk. |
| 260 kHz fixed oscillator | Enables predictable EMI profile and consistent filter design - avoids variable-frequency noise spreading. |
| 0.25 Ω RDS(ON) DMOS switch | Reduces conduction loss by ~30% vs. comparable 0.35 Ω devices - improves thermal margin at 500 mA. |
| Soft-start with external capacitor | Allows precise control of output rise time - prevents brownout in downstream logic during power-up. |
| TTL shutdown with 50 μA standby | Supports low-power system states without auxiliary LDOs - simplifies power management architecture. |
| Integrated thermal/current protection | Self-protects under sustained overload or ambient temperature rise - no external sensing circuitry required. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powers 3.3 V MCU, CAN transceiver, and analog sensor interface in DIN-rail mounted PLC module operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V to clean, regulated 3.3 V rail with ripple <50 mVPP at full load. Use Value: Delivers 500 mA continuously with 86% efficiency - keeps board temperature rise below 15°C without heatsink or airflow. |
Use Scenario: Supplies 3.3 V logic rail for microcontroller and LIN transceiver in automotive door module powered from 12 V battery (8–16 V range). IC Role / Device Role / Timing Role: Input-robust step-down converter handling cold-crank (6.5 V) and load-dump (40 V) transients per ISO 7637-2. Use Value: Wide 6.5–40 V input range and thermal shutdown ensure reliable operation across automotive temperature extremes (−40°C to +125°C). |
| Medical Point-of-Care Monitor | Networking Edge Router |
|
Use Scenario: Generates isolated 3.3 V supply for ARM-based processor and touch-screen controller in portable diagnostic device. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator between main Li-ion battery pack (8–12 V) and low-noise LDOs feeding analog front-end. Use Value: 260 kHz switching enables compact 68 µH inductor and 47 µF output capacitor - meets strict volume constraints. |
Use Scenario: Provides 3.3 V core voltage for Ethernet PHY and packet processor in fanless enterprise edge router with 48 V PoE input. IC Role / Device Role / Timing Role: Pre-regulator stepping 48 V down to 3.3 V before final LDO - reduces LDO thermal dissipation by >70%. Use Value: 95% peak efficiency at light loads and soft-start prevent inrush into large downstream capacitance - avoids PoE PSE disconnect. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672M-3.3/NOPB | Same pinout, 260 kHz, but rated for 1 A output - higher RDS(ON) (0.3 Ω) and larger thermal footprint. | Preferred where future load growth beyond 500 mA is anticipated; requires larger inductor and heatsinking. | Select LM2672M-3.3/NOPB only if >500 mA headroom is required - LM2671M-3.3/NOPB offers better efficiency at 300–500 mA loads. |
| TPS54331DR | 3.5–28 V input, 3 A output, 570 kHz switching - smaller solution size but requires external compensation and has no SYNC pin. | Better suited for space-constrained designs needing >1 A; lacks frequency synchronization for EMI control. | Choose TPS54331DR for higher current density; retain LM2671M-3.3/NOPB when EMI predictability, simplicity, or legacy compatibility is critical. |
Compared with LM2672M-3.3/NOPB and TPS54331DR, the LM2671M-3.3/NOPB delivers optimal balance of proven reliability, minimal external components (5 total), and deterministic 260 kHz EMI behavior - making it ideal for cost-sensitive, thermally constrained, or safety-reviewed industrial designs.
Availability
LM2671M-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 packaging.
Supply support for LM2671M-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 LM2671 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for engineers seeking robust, easy-to-implement DC-DC solutions with minimal external components and industry-standard inductor compatibility.
FAQ
What is the maximum input voltage rating for LM2671M-3.3/NOPB?
The absolute maximum input voltage for LM2671M-3.3/NOPB is 45 V, but the recommended operating range is 6.5 V to 40 V per TI SNVS008L. Operation above 40 V risks exceeding internal DMOS breakdown limits and voids parametric guarantees. For automotive load-dump scenarios, external TVS clamping is advised to keep VIN within 40 V.
Does LM2671M-3.3/NOPB require an external feedback resistor network?
No - LM2671M-3.3/NOPB is a fixed-output variant with internal feedback divider. The FB pin is internally connected to the 3.3 V output, so no external resistors are needed. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like LM2671MX-ADJ/NOPB.
Can LM2671M-3.3/NOPB synchronize to an external clock?
Yes - the SYNC pin accepts TTL/CMOS-compatible signals above 260 kHz (up to 400 kHz) to lock the internal oscillator. When synchronized, the LM2671M-3.3/NOPB maintains phase coherence across multiple converters, enabling predictable EMI filtering and reduced conducted noise in multi-rail systems.
What thermal performance can be expected from LM2671M-3.3/NOPB in SOIC package?
In 8-pin SOIC (D package), LM2671M-3.3/NOPB has RθJA = 105°C/W. At 500 mA output and 12 V input, typical power dissipation is ~0.35 W, resulting in ~37°C junction-to-ambient rise - well within the 125°C max junction limit. No heatsink is required with adequate PCB copper area.
Is LM2671M-3.3/NOPB pin-compatible with other LM2671 fixed-output variants?
Yes - all LM2671 fixed-output versions (3.3 V, 5 V, 12 V) share identical SOIC, PDIP, and WSON packages and pinouts. Only the internal feedback ratio differs; external circuitry (inductor, diode, capacitors, CB, SS) remains interchangeable across voltage options.
LM2671M-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2671M-3.3/NOPB FAQ
1.How can I place an order for LM2671M-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2671M-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 LM2671M-3.3/NOPB reliable?
The price and inventory of LM2671M-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 LM2671M-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2671M-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2671M-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2671M-3.3/NOPB?
LM2671M-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2671M-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 LM2671M-3.3/NOPB?
For technical support, including LM2671M-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2671M-3.3/NOPB requirements.
6.How does Aetrix verify that LM2671M-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2671M-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 LM2671M-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2671M-3.3/NOPB?
All LM2671M-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2671M-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 LM2671M-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2671M-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2671M-3.3/NOPB 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
