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Texas Instruments LMP8640MK-T/NOPB
- Part No.:
- LMP8640MK-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640MK-T/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
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Product details
Overview
LMP8640MK-T/NOPB from Texas Instruments is a precision high-side current sense amplifier with fixed 20 V/V gain, -2 V to +42 V common-mode input range, 0.25% max gain error, and 900 µV input offset voltage. It operates from 2.7 V to 12 V supply and delivers buffered output for direct ADC interfacing in battery-powered DC systems.
For engineers reviewing the LMP8640MK-T/NOPB datasheet, LMP8640MK-T/NOPB pinout, LMP8640MK-T/NOPB application, or LMP8640MK-T/NOPB equivalent, this device supports high-accuracy current monitoring in automotive, industrial power management, motor control, and battery protection circuits where wide common-mode rejection and temperature-stable gain are critical.
Technical Context
The LMP8640MK-T/NOPB uses a precision current-sense topology with matched internal resistive feedback (RG = 2×RIN) and differential input stage optimized for high CMRR across its full -2 V to +42 V common-mode range. Its fixed-gain architecture eliminates external resistor selection errors and ensures ±0.25% gain accuracy over temperature.
It features low input bias current (13 µA typical), 103 dB CMRR at 2.1–42 V common mode, 85 dB PSRR, and 950 kHz small-signal bandwidth at 20 V/V gain - enabling accurate, stable sensing of millivolt-level sense voltages in noisy high-voltage environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 20 V/V - eliminates external gain-setting resistor errors and ensures consistent signal scaling into downstream ADCs |
| Common-Mode Input Range | -2 V to +42 V - supports high-side sensing in 12 V, 24 V, and 42 V automotive and industrial bus systems |
| Max Gain Error | ±0.25% - guarantees ≤2.5 mV error on 1 V output for precise current reconstruction |
| Input Offset Voltage | ±900 µV - enables accurate detection of sub-50 mV sense voltages across shunt resistors |
| Supply Voltage Range | 2.7 V to 12 V - compatible with single-supply microcontrollers and low-voltage logic interfaces |
| Bandwidth | 950 kHz - supports fast transient current monitoring in motor phase control and overcurrent protection |
| CMRR | 103 dB (2.1–42 V) - rejects noise from high-voltage switching nodes while preserving small differential signals |
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 10 MΩ loads with <80 mV min/2.65 V max swing at 2.7 V supply |
| 2 - V− | Negative supply | Ground reference or negative rail; supports true negative common-mode operation down to -2 V |
| 3 - +IN | Positive input | High-impedance node connected to high-side shunt terminal; accepts up to +60 V absolute |
| 4 - -IN | Negative input | High-impedance node connected to low-side shunt terminal; matches +IN for differential sensing |
| 5 - NC | No connect | Internally unconnected; must be left floating or tied to ground per layout best practices |
| 6 - V+ | Positive supply | Power input (2.7–12 V); supplies internal amplifier and output buffer |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 20 V/V gain | Guarantees production-ready accuracy without external resistor tolerance or drift effects |
| 103 dB CMRR (2.1–42 V) | Maintains signal integrity when placed directly on high-noise battery or bus rails |
| 900 µV input offset | Enables use with 1 mΩ–10 mΩ shunts in 0–50 A current ranges without calibration |
| 950 kHz bandwidth | Supports real-time current feedback for closed-loop motor control and fast fault detection |
| 2.7–12 V supply range | Operates from Li-ion battery (3.0–4.2 V), 5 V logic rails, or 12 V automotive systems |
Applications
| Automotive Battery Monitoring | Industrial Motor Phase Current Sensing |
|---|---|
Use Scenario: Real-time monitoring of 12 V lead-acid or 48 V mild-hybrid battery pack current during charge/discharge cycles. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to scaled analog output for MCU ADC sampling. Use Value: Enables SOC estimation and overcurrent cutoff with ±0.5% full-scale accuracy across -40°C to +125°C ambient. |
Use Scenario: Closed-loop current feedback in three-phase BLDC motor drives using discrete IGBTs or MOSFETs. IC Role / Device Role / Timing Role: Fast-response current monitor placed on each phase leg to feed PWM-controlled current regulators. Use Value: 950 kHz bandwidth and 1.4 V/µs slew rate support 20 kHz PWM switching with minimal phase lag. |
| Server PSU Output Current Protection | Smart Power Strip Load Management |
Use Scenario: Secondary-side current sensing in 48 V intermediate bus converters for OCP and derating logic. IC Role / Device Role / Timing Role: High-common-mode amplifier isolating sense signal from 48 V rail while rejecting switching noise. Use Value: 103 dB CMRR suppresses >60 Vpp ripple at 100–500 kHz, ensuring clean ADC readings under load transients. |
Use Scenario: Individual outlet current measurement in multi-socket smart power strips with USB-C PD negotiation. IC Role / Device Role / Timing Role: Precision current monitor per outlet feeding microcontroller for real-time load balancing and overload shutdown. Use Value: ±900 µV offset allows detection of 10 mA leakage or 50 mA standby loads using 0.1 Ω shunts. |
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 | 20 V/V gain, -4 V to +80 V common-mode, 120 kHz bandwidth, 50 µV offset | Better offset and wider common-mode, but lower bandwidth limits high-speed motor control use | Select for ultra-low-offset precision in battery monitoring where bandwidth <200 kHz suffices |
| MAX40056ATA+T | 20 V/V gain, -0.2 V to +65 V common-mode, 1.5 MHz bandwidth, 1.5 mV offset | Higher bandwidth supports faster control loops, but higher offset reduces low-current resolution | Select for high-frequency switching applications requiring >1 MHz response with moderate accuracy |
Compared with LMP8640MK-T/NOPB, INA240A1IDR offers superior offset performance and extended common-mode range but trades bandwidth for precision, while MAX40056ATA+T provides higher speed at the cost of reduced DC accuracy - making LMP8640MK-T/NOPB optimal for balanced 20 V/V sensing in automotive and industrial 12–42 V systems.
Availability
LMP8640MK-T/NOPB is available at Aetrix Electronics and suitable for automotive battery monitoring, industrial motor control, server power supply protection, and smart energy metering requiring stable component supply and long-term manufacturability.
Supply support for LMP8640MK-T/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 amplifiers and power management ICs.
The LMP8640MK-T/NOPB belongs to TI's precision current sense amplifier product line, designed specifically for high-accuracy, high-common-mode current measurement in automotive, industrial, and computing power systems.
FAQ
What is the maximum common-mode voltage supported by the LMP8640MK-T/NOPB?
The LMP8640MK-T/NOPB supports a common-mode input voltage range of -2 V to +42 V. This enables reliable high-side current sensing on 12 V, 24 V, and 42 V automotive and industrial bus systems without level-shifting circuitry. The specification is validated across the full operating temperature range (-40°C to +125°C).
Does the LMP8640MK-T/NOPB require external gain-setting resistors?
No, the LMP8640MK-T/NOPB has an internally fixed 20 V/V gain. Its RG = 2×RIN architecture uses matched on-die resistors, eliminating external components and associated tolerance, drift, and layout sensitivity - ensuring ±0.25% gain accuracy over temperature and supply voltage.
Can the LMP8640MK-T/NOPB operate from a 3.3 V supply?
Yes, the LMP8640MK-T/NOPB operates from 2.7 V to 12 V supply. At 3.3 V, it maintains full functionality including 103 dB CMRR and 900 µV offset, with output swing limited to approximately 40 mV to 3.15 V - sufficient for interfacing with 3.3 V ADCs with appropriate reference scaling.
What is the function of Pin 5 (NC) on the LMP8640MK-T/NOPB?
Pin 5 is Not Connected (NC) - it is not bonded internally and carries no electrical function. TI recommends leaving it unconnected or tying it to ground for mechanical stability and ESD robustness. Routing traces or vias to this pin is unnecessary and may compromise thermal or electrical performance.
How does the LMP8640MK-T/NOPB handle negative common-mode voltages?
The LMP8640MK-T/NOPB supports common-mode inputs down to -2 V relative to V−, enabling sensing in configurations where the shunt is placed between load and negative rail (e.g., ground-referenced loads with negative supply). Input pins tolerate -6 V absolute, and internal circuitry remains functional and specified down to -2 V common mode.
LMP8640MK-T/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:
- 950 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-T/NOPB FAQ
1.How can I place an order for LMP8640MK-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640MK-T/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-T/NOPB reliable?
The price and inventory of LMP8640MK-T/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-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640MK-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640MK-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640MK-T/NOPB?
LMP8640MK-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640MK-T/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-T/NOPB?
For technical support, including LMP8640MK-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640MK-T/NOPB requirements.
6.How does Aetrix verify that LMP8640MK-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640MK-T/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-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640MK-T/NOPB?
All LMP8640MK-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640MK-T/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-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8640MK-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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