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Texas Instruments LMP8640MKX-T/NOPB
- Part No.:
- LMP8640MKX-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640MKX-T/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,210
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Product details
Overview
LMP8640MKX-T/NOPB from Texas Instruments is a precision high-side current sense amplifier with fixed 20 V/V gain, operating from 2.7 V to 12 V supply and supporting −2 V to +42 V common-mode input voltage. It delivers 900 µV max input offset, 0.25% max gain error, 103 dB CMRR (2.1 V–42 V), and 85 dB PSRR - enabling accurate DC/AC current monitoring in battery-powered motor control and power management systems.
For engineers reviewing the LMP8640MKX-T/NOPB datasheet, LMP8640MKX-T/NOPB pinout, LMP8640MKX-T/NOPB application, or LMP8640MKX-T/NOPB equivalent, key selection criteria include its SOT-23-6 package, −40°C to +125°C operation, 950 kHz bandwidth at 20 V/V gain, 13 µA input bias current, and compatibility with high-side shunt sensing in automotive-grade and industrial power rails.
Technical Context
The LMP8640MKX-T/NOPB implements a precision instrumentation amplifier topology optimized for high common-mode rejection across its full −2 V to +42 V range. Its internal matched 5 kΩ RIN resistors set differential input impedance and enable stable gain accuracy without external trimming.
It uses a buffered rail-to-rail output stage delivering low output impedance and supports load currents up to ±10 mA while maintaining linearity. The device operates with no external gain-setting components - gain is factory-trimmed and fixed at 20 V/V, eliminating resistor matching errors and layout sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - fixed, factory-trimmed; eliminates external resistor matching and ensures consistent signal scaling into ADCs. |
| Common-Mode Voltage Range | −2 V to +42 V - enables direct sensing on high-side battery or bus rails above supply voltage. |
| Input Offset Voltage | ±900 µV max - limits current measurement error to ≤0.45 mV at 20 mV sense voltage (e.g., 50 A @ 40 µΩ shunt). |
| Gain Error | ±0.25% max - ensures <10 mV absolute output error over temperature for 2 V full-scale output. |
| CMRR | 103 dB (2.1 V–42 V) - rejects >99.9% of common-mode noise in noisy power rail environments. |
| Bandwidth | 950 kHz - supports fast transient detection in motor phase current or overcurrent protection loops. |
| Supply Current | 722 µA max at 12 V, 25°C - enables low-power always-on monitoring in battery-backed systems. |
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 (Pin 1) | Amplified output | Buffered voltage output referenced to V−; drives ADC inputs or comparator thresholds directly. |
| V− (Pin 2) | Negative supply | Ground reference for output stage; must be connected to system ground or low-side shunt node. |
| +IN (Pin 3) | Positive input | High-impedance sense node connected to high-side of shunt resistor; accepts up to +42 V common mode. |
| −IN (Pin 4) | Negative input | High-impedance sense node connected to low-side of shunt; differential input defines VSENSE = +IN − −IN. |
| NC (Pin 5) | No connect | Internally unconnected; must remain floating - no PCB trace or thermal pad connection. |
| V+ (Pin 6) | Positive supply | Power input (2.7–12 V); supplies internal amplifier and output buffer; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 20 V/V gain | Eliminates external gain resistors and associated tolerance/temperature drift, reducing BOM count and layout sensitivity. |
| −2 V to +42 V common-mode range | Supports bidirectional current sensing and negative rail monitoring (e.g., cold-junction compensation, reverse-current detection). |
| 103 dB CMRR at full common-mode range | Maintains accuracy in high-noise environments like motor drives or switch-mode power supplies without additional filtering. |
| 950 kHz bandwidth | Enables real-time current waveform capture for closed-loop motor control or fast overcurrent response (<1 µs rise time). |
| 6-pin SOT-23 package | Minimizes PCB footprint and thermal mass; compatible with standard reflow profiles and automated assembly. |
Applications
| Motor Phase Current Monitoring | Battery Pack Current Sensing |
|---|---|
Use Scenario: Real-time measurement of individual motor phase currents in BLDC or stepper drivers using high-side shunt resistors. IC Role / Device Role / Timing Role: High-side current sense amplifier converting mV-level shunt voltage to robust 0–2 V analog output for MCU ADC sampling. Use Value: Enables precise field-oriented control (FOC) with <0.5% current measurement error across −40°C to +125°C ambient. | Use Scenario: Bidirectional current monitoring in lithium-ion battery packs for state-of-charge (SoC) and health (SoH) estimation. IC Role / Device Role / Timing Role: Precision analog front-end converting shunt voltage to conditioned output for fuel-gauge IC or microcontroller. Use Value: Supports ±900 µV offset and −2 V common-mode capability to detect charge/discharge direction and leakage currents accurately. |
| Industrial Power Supply OCP | Automotive HVAC Blower Control |
Use Scenario: Overcurrent protection in 24 V/48 V industrial DC power supplies using high-side sensing before the main regulator. IC Role / Device Role / Timing Role: Fast-response current monitor feeding comparator or digital controller for sub-µs fault shutdown. Use Value: 950 kHz bandwidth and 1.4 V/µs slew rate allow detection of 100 ns current spikes without aliasing or delay. | Use Scenario: Closed-loop speed control of 12 V automotive HVAC blower motors via PWM-driven MOSFETs. IC Role / Device Role / Timing Role: High-side current feedback element providing real-time load current to MCU for adaptive torque regulation. Use Value: −2 V to +42 V common-mode range accommodates battery transients (load dump, cranking) without saturation or recovery delay. |
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 |
|---|---|---|---|
| INA240A1QDRQ1 | 500 kHz bandwidth, 20 V/V gain, −5 V to +80 V common-mode, AEC-Q100 Grade 1 | Automotive-qualified; wider common-mode range but lower bandwidth than LMP8640MKX-T/NOPB | Select for automotive systems requiring AEC-Q100 qualification and extended common-mode tolerance. |
| MAX4080TASA+ | 250 kHz bandwidth, 20 V/V gain, −0.1 V to +76 V common-mode, 1.5 µV/°C offset drift | Higher offset drift and lower bandwidth; suited for cost-sensitive, non-critical monitoring | Select when ultra-low offset drift is not required and common-mode extends below −2 V (e.g., sensor biasing). |
Compared with INA240A1QDRQ1 and MAX4080TASA+, the LMP8640MKX-T/NOPB offers superior bandwidth (950 kHz vs. 500/250 kHz) and tighter gain error (±0.25% vs. ±0.5%/±1%), making it optimal for high-fidelity current waveform capture in industrial motor control and precision power management.
Availability
LMP8640MKX-T/NOPB is available at Aetrix Electronics and suitable for motor controls, battery monitoring, and industrial power management requiring stable component supply and long-term production continuity.
Supply support for LMP8640MKX-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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and power management ICs.
The LMP8640 product line was designed for high-accuracy, high-common-mode current sensing in space-constrained industrial and automotive power systems - prioritizing gain stability, low offset, and robust ESD performance in SOT-23 packaging.
FAQ
What is the common-mode voltage range supported by the LMP8640MKX-T/NOPB?
The LMP8640MKX-T/NOPB supports a common-mode voltage range of −2 V to +42 V. This allows it to accurately sense current on high-side shunt resistors even when the shunt voltage exceeds the device's supply voltage - critical for battery monitoring and motor drive applications where rail voltages fluctuate widely. The specification is validated across the full operating temperature range.
Does the LMP8640MKX-T/NOPB require external gain-setting resistors?
No, the LMP8640MKX-T/NOPB does not require external gain-setting resistors. It features a factory-trimmed fixed gain of 20 V/V, implemented using internal matched thin-film resistors. This eliminates resistor matching errors, temperature drift, and PCB layout sensitivity - ensuring consistent performance across units and over temperature without calibration.
What is the maximum bandwidth and slew rate of the LMP8640MKX-T/NOPB at 20 V/V gain?
At 20 V/V gain, the LMP8640MKX-T/NOPB has a typical bandwidth of 950 kHz and a slew rate of 1.4 V/µs (measured at 2.7 V supply). These specifications enable accurate capture of fast current transients in motor control and overcurrent protection circuits, with rise times under 1 µs for small-signal steps.
Can the LMP8640MKX-T/NOPB operate with a single 3.3 V supply?
Yes, the LMP8640MKX-T/NOPB operates from 2.7 V to 12 V supply voltage, fully supporting 3.3 V single-supply operation. At 3.3 V, it maintains its −2 V to +42 V common-mode range and delivers full performance including 900 µV max offset and 0.25% gain error - making it ideal for low-voltage embedded systems interfacing with higher-voltage power stages.
Is Pin 5 (NC) allowed to be connected to ground or left floating on the LMP8640MKX-T/NOPB?
Pin 5 (NC) on the LMP8640MKX-T/NOPB is internally not connected and must remain floating - it must not be tied to ground, V+, V−, or any other node. Connecting NC to any potential risks internal leakage paths or undefined behavior. The datasheet explicitly states this pin is "Not Internally Connected" and requires no PCB routing or thermal pad attachment.
LMP8640MKX-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:
- Active
- 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
LMP8640MKX-T/NOPB FAQ
1.How can I place an order for LMP8640MKX-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640MKX-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 LMP8640MKX-T/NOPB reliable?
The price and inventory of LMP8640MKX-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 LMP8640MKX-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640MKX-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640MKX-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640MKX-T/NOPB?
LMP8640MKX-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640MKX-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 LMP8640MKX-T/NOPB?
For technical support, including LMP8640MKX-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640MKX-T/NOPB requirements.
6.How does Aetrix verify that LMP8640MKX-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640MKX-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 LMP8640MKX-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640MKX-T/NOPB?
All LMP8640MKX-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640MKX-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 LMP8640MKX-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8640MKX-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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