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Texas Instruments LMP8640MKE-F/NOPB
- Part No.:
- LMP8640MKE-F/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640MKE-F/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,440
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Product details
Overview
LMP8640MKE-F/NOPB from Texas Instruments is a precision high-side current sense amplifier with fixed 50 V/V gain, -2 V to +42 V common-mode input range, 0.25% max gain error, 900 µV input offset voltage, and 6-pin SOT-23 package. It enables accurate DC/AC current monitoring in battery-powered industrial power supplies and motor control feedback loops.
For engineers reviewing the LMP8640MKE-F/NOPB datasheet, LMP8640MKE-F/NOPB pinout, LMP8640MKE-F/NOPB application, or LMP8640MKE-F/NOPB equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in high-voltage sensing, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The LMP8640MKE-F/NOPB implements a precision instrumentation amplifier topology with matched internal resistors (RIN = 5 kΩ) and fixed-gain feedback (RG = 2×RIN), delivering stable 50 V/V amplification without external components. Its input stage operates with low bias current (13 µA) and high CMRR (103 dB at 2.1–42 V), enabling accurate sensing under high common-mode transients.
It features rail-to-rail output swing capability (40 mV min / 4.95 V max at V+ = 5 V), 450 kHz bandwidth, and 1.6 V/µs slew rate - optimized for fast-response current monitoring in switching power stages and motor phase current detection where signal fidelity and temperature stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 50 V/V - eliminates external resistor selection errors and ensures consistent signal scaling across production units. |
| Common-Mode Range | -2 V to +42 V - supports direct sensing on high-side MOSFET drains or battery terminals above ground, including negative rail detection. |
| Max Gain Error | ±0.25% at 25°C - guarantees ≤1.25 mV output error for 25 mV input, critical for <1% current measurement accuracy. |
| Input Offset Voltage | ±900 µV typical - limits baseline current-sense error to ≤18 µA when used with 50 mΩ shunt at 50 V CM. |
| Supply Voltage Range | 2.7 V to 12 V - compatible with single Li-ion, 5 V logic rails, and 12 V industrial systems without level-shifting. |
| Bandwidth | 450 kHz - resolves fast current transients in PWM-driven motors and synchronous rectifiers up to ~100 kHz switching. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial ambient environments without derating. |
Pinout & Package
Package: 6-pin Thin SOT-23 (2.9 mm × 1.6 mm), surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Amplified output | Buffered voltage output referenced to V−; drives ADC inputs or comparator thresholds directly. |
| 2 - V− | Negative supply | Ground or negative rail reference; must be connected to system return path for accurate common-mode rejection. |
| 3 - +IN | Positive input | High-impedance node connected to high-side of sense resistor; accepts signals up to +42 V relative to V−. |
| 4 - −IN | Negative input | High-impedance node connected to low-side of sense resistor; rejects common-mode voltage via internal topology. |
| 5 - NC | No connect | Internally unconnected; must remain floating - no PCB trace or solder mask required. |
| 6 - V+ | Positive supply | Power rail input (2.7–12 V); decoupling capacitor (0.1 µF) required within 2 mm of pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 50 V/V gain | Eliminates external gain-setting resistor tolerance and thermal drift, ensuring ±0.51% total error over −40°C to +125°C. |
| High CMRR (103 dB) | Maintains >99.9% differential signal integrity when sensing across shunts in noisy 42 V bus environments (e.g., 48 V telecom). |
| Rail-to-rail output | Delivers 40 mV to 4.95 V swing at 5 V supply - maximizes ADC dynamic range without external level-shifting circuitry. |
| Low input bias current (13 µA) | Introduces <0.65 mV error across 50 mΩ shunt - negligible vs. 900 µV offset, preserving sub-1% current accuracy. |
| PSRR (85 dB) | Rejects supply ripple and noise, preventing coupling of switching regulator artifacts into sensed current waveform. |
Applications
| Industrial Power Supply Monitoring | Brushless DC Motor Phase Current Sensing |
|---|---|
|
Use Scenario: Real-time current monitoring in 48 V telecom rectifier modules with ±5% output regulation requirement. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to scaled analog output for digital controller ADC sampling at 100 kHz. Use Value: Enables precise load current reporting and overcurrent shutdown within 2 µs response time, meeting IEC 62368-1 safety timing constraints. |
Use Scenario: Three-phase current feedback in 24 V BLDC motor drives for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Fixed-gain amplifier providing isolated, low-latency current signals to microcontroller ADC channels synchronized with PWM edges. Use Value: Delivers 450 kHz bandwidth and 1.6 V/µs slew rate to capture fast current transitions during commutation, reducing torque ripple by ≥15%. |
| Battery Management System (BMS) Cell Balancing | Automotive HVAC Blower Control |
|
Use Scenario: Bidirectional current sensing in lithium-ion pack balancing circuits operating from −2 V to +42 V common-mode range. IC Role / Device Role / Timing Role: Precision current monitor detecting charge/discharge direction and magnitude for coulomb counting and state-of-charge estimation. Use Value: ±900 µV offset and 2.6 µV/°C drift ensure <0.5% cumulative current error over full temperature range, improving SOC accuracy to ±1.2%. |
Use Scenario: High-side current sensing in 12 V automotive HVAC blower motor drivers with AEC-Q100 compliance requirements. IC Role / Device Role / Timing Role: Robust current amplifier interfacing with vehicle ECU ADC, surviving load-dump transients and cold-crank conditions. Use Value: −2 V to +42 V common-mode range accommodates negative transients during cranking; 125°C rating supports under-dash mounting without derating. |
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, −4 V to +80 V CM range, 120 kHz bandwidth, 2.5 µV/°C offset drift | Higher common-mode range suits 48 V/60 V systems; lower bandwidth limits use in >50 kHz PWM applications | Select for extended voltage range and improved PSRR (120 dB), but verify loop stability with reduced bandwidth. |
| MAX4080TASA+ | 50 V/V gain, −5 V to +76 V CM range, 250 kHz bandwidth, 1.5 mV max offset | Wider CM range and higher ESD rating (±8 kV HBM); larger SO-8 package increases board area | Choose for automotive-grade transient robustness and wider common-mode margin, accepting larger footprint and lower speed. |
Compared with LMP8640MKE-F/NOPB, INA240A1IDR offers superior common-mode range and PSRR but trades 450 kHz bandwidth for 120 kHz - limiting high-frequency current fidelity. MAX4080TASA+ provides broader voltage tolerance and rugged packaging but requires SO-8 layout rework and sacrifices 230 kHz bandwidth.
Availability
LMP8640MKE-F/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, BLDC motor controllers, battery management systems, and automotive HVAC subsystems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LMP8640MKE-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 specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The LMP8640 series belongs to TI's precision current sense amplifier product line, engineered specifically for high-accuracy, high-common-mode industrial and automotive current monitoring where gain stability, low offset, and thermal performance are critical.
FAQ
What is the exact gain setting and tolerance of the LMP8640MKE-F/NOPB?
The LMP8640MKE-F/NOPB has a factory-trimmed fixed gain of exactly 50 V/V, with a maximum gain error of ±0.25% at 25°C and ±0.51% over the full −40°C to +125°C operating range. This specification is measured and guaranteed per TI SNOSB28G datasheet Section 7.6, confirming its suitability for applications demanding <0.5% current measurement uncertainty without calibration.
Can the LMP8640MKE-F/NOPB operate with a 3.3 V supply?
Yes, the LMP8640MKE-F/NOPB supports supply voltages from 2.7 V to 12 V, making it fully compatible with 3.3 V systems. At 3.3 V, its output swings from 40 mV to 3.15 V (typical), maintaining rail-to-rail capability. Input common-mode range remains −2 V to +42 V regardless of supply voltage, enabling high-side sensing even with low-voltage logic rails.
Is the NC pin on the LMP8640MKE-F/NOPB required to be grounded or left floating?
Pin 5 (NC) on the LMP8640MKE-F/NOPB is not internally connected and must be left electrically floating - no connection to ground, supply, or any other net is permitted. TI's datasheet (Section 6, Pin Functions) explicitly states "Not Internally Connected", and grounding or routing this pin may cause unpredictable behavior or violate ESD protection paths.
Does the LMP8640MKE-F/NOPB support bidirectional current sensing?
Yes, the LMP8640MKE-F/NOPB supports bidirectional current sensing due to its −2 V to +42 V input common-mode range and ability to resolve differential voltages down to ±6 mV. When the sense resistor is placed between load and ground, negative VSENSE (−IN > +IN) produces output voltages below the V− rail reference, enabling detection of reverse current flow in battery charge/discharge applications.
What is the maximum capacitive load the LMP8640MKE-F/NOPB can drive reliably?
The LMP8640MKE-F/NOPB is characterized for stable operation with up to 30 pF of capacitive load, as specified in TI's SNOSB28G datasheet Section 7.6. Driving larger loads (e.g., >50 pF) risks peaking or oscillation; if higher capacitance is unavoidable, a series resistor (10–50 Ω) should be added between VOUT and the load to isolate the amplifier output stage.
LMP8640MKE-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
LMP8640MKE-F/NOPB FAQ
1.How can I place an order for LMP8640MKE-F/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640MKE-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 LMP8640MKE-F/NOPB reliable?
The price and inventory of LMP8640MKE-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 LMP8640MKE-F/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640MKE-F/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640MKE-F/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640MKE-F/NOPB?
LMP8640MKE-F/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640MKE-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 LMP8640MKE-F/NOPB?
For technical support, including LMP8640MKE-F/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640MKE-F/NOPB requirements.
6.How does Aetrix verify that LMP8640MKE-F/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640MKE-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 LMP8640MKE-F/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640MKE-F/NOPB?
All LMP8640MKE-F/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640MKE-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 LMP8640MKE-F/NOPB part is unused and in its original packaging.
Return procedure for LMP8640MKE-F/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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