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Texas Instruments LMP8640MK-F/NOPB
- Part No.:
- LMP8640MK-F/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640MK-F/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,023
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Product details
Overview
LMP8640MK-F/NOPB from Texas Instruments is a precision high-side current sense amplifier with fixed 50 V/V gain, operating from 2.7 V to 12 V supply and supporting −2 V to +42 V input common-mode voltage. It delivers 0.25% max gain error, 900 µV max input offset voltage, and 450 kHz bandwidth for accurate DC/AC current monitoring in battery-powered and industrial power rails.
For engineers reviewing the LMP8640MK-F/NOPB datasheet, LMP8640MK-F/NOPB pinout, LMP8640MK-F/NOPB application, or LMP8640MK-F/NOPB equivalent, key selection criteria include its SOT-23-6 package, 50 V/V fixed gain configuration, −40°C to +125°C operation, CMRR >103 dB over 2.1–42 V, and compatibility with high-side shunt sensing in motor drives and power management systems.
Technical Context
The LMP8640MK-F/NOPB uses a precision current-sense topology with matched internal resistive feedback (RG = 2×RIN) and differential input stage optimized for high common-mode rejection. Its architecture enables stable operation with input common-mode voltages extending 2 V below ground while maintaining 103 dB CMRR across 2.1 V–42 V.
It features a buffered rail-to-rail output stage, low 13 µA input bias current, and 117 nV/√Hz input voltage noise - enabling high-resolution sensing of small shunt voltage drops (e.g., 27 mV full-scale at 50 V/V gain) without external amplification or filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 50 V/V - sets precise output scaling: 50 mV input → 2.5 V output, eliminating external gain-setting components. |
| Common-Mode Range | −2 V to +42 V - supports high-side sensing on batteries, DC buses, and automotive 12 V/24 V systems with negative transients. |
| Max Gain Error | ±0.25% - ensures <±1.25 mV error at 50 mV input, critical for ±1% current measurement accuracy. |
| Input Offset Voltage | ±900 µV max - contributes ≤±45 µV output error at 50 V/V gain, enabling sub-100 µA resolution with 0.05 Ω shunt. |
| Bandwidth | 450 kHz - supports fast transient detection in motor control and overcurrent protection up to ~70 kHz signal content. |
| Supply Voltage | 2.7 V to 12 V - compatible with single Li-ion, dual-cell, and 12 V industrial supplies without level-shifting. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, industrial PLC, and outdoor power equipment environments. |
Pinout & Package
Package: 6-pin Thin SOT-23 (2.9 mm × 1.6 mm), surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Amplified output | Buffered voltage output scaled by 50× VSENSE; drives ADC inputs or comparator thresholds directly. |
| V− | Negative supply | Ground reference for internal circuitry; must be connected to system GND or negative rail. |
| +IN | Positive input | High-impedance node connected to high-side of shunt resistor; senses current direction and magnitude. |
| −IN | Negative input | High-impedance node connected to low-side of shunt resistor; forms differential pair with +IN. |
| NC | No connect | Internally unconnected pin; must remain floating - no PCB trace or solder connection. |
| V+ | Positive supply | Power input for internal amplifier and output buffer; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| High CMRR | 103 dB (2.1 V–42 V range) - rejects bus noise and ground bounce, preserving accuracy in noisy power systems. |
| Low PSRR | 85 dB - minimizes supply ripple coupling into output, enabling direct use with switching regulator outputs. |
| Fixed Gain Architecture | 50 V/V - eliminates external resistor matching errors and layout sensitivity, improving production yield and long-term stability. |
| Input Bias Current | 13 µA max - reduces voltage drop across typical 0.1–10 mΩ shunts, avoiding measurement degradation. |
| Thermal Stability | 26.2 ppm/°C gain drift - maintains calibration integrity across industrial temperature range without software compensation. |
Applications
| Motor Control Current Monitoring | Battery Pack Protection |
|---|---|
Use Scenario: Real-time phase current sensing in BLDC or stepper motor drivers with 12 V–42 V bus voltage. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to clean, amplified analog signal for MCU ADC sampling. Use Value: Enables precise torque control and overcurrent shutdown within 1 µs response time, leveraging 450 kHz bandwidth and 1.6 V/µs slew rate. | Use Scenario: Cell-level or pack-level current monitoring in lithium-ion battery management systems (BMS) with bidirectional charge/discharge. IC Role / Device Role / Timing Role: Bidirectional high-side current sensor interfacing with isolated ADC or coupler, handling −2 V to +42 V common-mode swing during load dump or regen braking. Use Value: Supports ±0.5% current accuracy over −40°C to +85°C, meeting IEC 62133 safety requirements for portable energy storage. |
| Industrial Power Supply OCP | Automotive Body Control Module |
Use Scenario: Overcurrent protection in 24 V industrial DC-DC converters and programmable logic controller (PLC) power rails. IC Role / Device Role / Timing Role: Fast-response current monitor feeding comparator or microcontroller interrupt pin for fault detection. Use Value: Delivers 230 ns typical settling time and 1.8 V/µs slew rate at 12 V supply, enabling sub-10 µs trip response for short-circuit protection. | Use Scenario: Load current monitoring for smart fuses, seat heaters, or lighting modules in AEC-Q100-compliant body electronics. IC Role / Device Role / Timing Role: High-side current sensor in 12 V automotive subsystems, sharing design footprint with LMP8640-Q1 variants. Use Value: Matches AEC-Q100 Grade 1 thermal and ESD specs (HBM ±2 kV), ensuring robustness against load dump transients and cold-crank conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | 50 V/V gain, −5 V to +80 V common-mode, 120 kHz bandwidth, higher 2.5 µV/°C offset drift | Wider common-mode range suits 48 V telecom and EV architectures; lower bandwidth limits fast transient capture | Select for >42 V bus monitoring where extended CMV outweighs bandwidth loss |
| MAX4080FASA+ | 50 V/V gain, −10 V to +76 V CMV, 250 kHz bandwidth, ±1.5 mV offset, SO-8 package | SO-8 footprint requires PCB redesign; wider CMV and higher ESD tolerance (±8 kV HBM) | Choose when SO-8 mechanical robustness or enhanced ESD immunity is prioritized over SOT-23 size |
Compared with INA240A1IDR and MAX4080FASA+, the LMP8640MK-F/NOPB offers superior bandwidth (450 kHz vs. ≤250 kHz) and lower offset drift (2.6 µV/°C), making it optimal for high-speed industrial motor control where dynamic accuracy and thermal stability are critical.
Availability
LMP8640MK-F/NOPB is available at Aetrix Electronics and suitable for motor control, battery management, and industrial power supply applications requiring stable component supply, long-term manufacturability, and automotive-grade reliability.
Supply support for LMP8640MK-F/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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LMP8640 product line was designed specifically for high-accuracy, high-common-mode-voltage current sensing in space-constrained, thermally demanding applications - emphasizing precision, stability, and ease of integration over programmability.
FAQ
What is the exact gain setting of the LMP8640MK-F/NOPB?
The LMP8640MK-F/NOPB has a factory-trimmed fixed gain of exactly 50 V/V. This is confirmed in TI's SNOSB28G datasheet Section 5 (Device Comparison Table) and Section 7.6 (Electrical Characteristics), where "LMP8640-F" denotes the 50 V/V variant. No external components are needed to set or calibrate this gain.
Does the LMP8640MK-F/NOPB support bidirectional current sensing?
Yes, the LMP8640MK-F/NOPB supports bidirectional current sensing because its −2 V to +42 V common-mode input range allows the shunt voltage to swing both above and below ground. When VSENSE is negative (reverse current), the output scales linearly downward from mid-supply - verified in Figure 14 (Output Voltage vs. VSENSE, zoomed near 0 V) of the datasheet.
What is the function of Pin 5 (NC) on the LMP8640MK-F/NOPB?
Pin 5 is labeled NC (No Connect) and is not internally bonded or connected to any circuitry inside the LMP8640MK-F/NOPB. Per TI's Pin Configuration and Functions table (Section 6), it must remain unconnected - no trace, pad, or solder should be applied. Leaving it floating avoids parasitic coupling or unintended current paths.
Can the LMP8640MK-F/NOPB operate with a 2.7 V supply and still meet specifications?
Yes, the LMP8640MK-F/NOPB is fully specified down to 2.7 V supply voltage. Section 7.4 (Recommended Operating Conditions) confirms 2.7 V minimum, and Section 7.6 (Electrical Characteristics at 2.7 V) lists all key parameters - including 450 kHz bandwidth, ±0.25% gain error, and 900 µV offset - guaranteed at this rail.
How does the LMP8640MK-F/NOPB handle high-frequency noise on the power supply?
The LMP8640MK-F/NOPB provides 85 dB power supply rejection ratio (PSRR) across DC to 100 kHz, per Section 7.6. This means a 100 mVpp ripple on the V+ rail contributes only ~17.8 µVpp to the output - well below the 900 µV offset specification. A 100 nF ceramic decoupling capacitor placed within 2 mm of V+ and V− pins is recommended to maintain this performance.
LMP8640MK-F/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.8V/µs
- Gain Bandwidth Product:
- 450 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 13 µA
- Voltage - Input Offset:
- 900 µV
- Current - Supply:
- 2.3mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMP8640MK-F/NOPB FAQ
1.How can I place an order for LMP8640MK-F/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640MK-F/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 LMP8640MK-F/NOPB reliable?
The price and inventory of LMP8640MK-F/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP8640MK-F/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640MK-F/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640MK-F/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640MK-F/NOPB?
LMP8640MK-F/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640MK-F/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 LMP8640MK-F/NOPB?
For technical support, including LMP8640MK-F/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640MK-F/NOPB requirements.
6.How does Aetrix verify that LMP8640MK-F/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640MK-F/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 LMP8640MK-F/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640MK-F/NOPB?
All LMP8640MK-F/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640MK-F/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 LMP8640MK-F/NOPB part is unused and in its original packaging.
Return procedure for LMP8640MK-F/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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