My Inquiry
My Account
Texas Instruments LMP8640MKE-T/NOPB
- Part No.:
- LMP8640MKE-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640MKE-T/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:305
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMP8640MKE-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 voltage, 0.25% max gain error, and 103 dB CMRR (2.1 V–42 V), enabling accurate DC/AC current monitoring in battery-powered industrial power supplies and motor control feedback loops.
For engineers reviewing the LMP8640MKE-T/NOPB datasheet, LMP8640MKE-T/NOPB pinout, LMP8640MKE-T/NOPB application, or LMP8640MKE-T/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed gain accuracy over temperature, real-world application constraints for high-common-mode sensing, and two rigorously cross-checked alternative parts with documented functional trade-offs.
Technical Context
The LMP8640MKE-T/NOPB implements a precision current-sense topology using matched internal resistors (RIN = 5 kΩ) and a low-input-bias-current error amplifier to reject high common-mode voltages while amplifying small differential sense signals. Its fixed-gain architecture eliminates external resistor matching errors and ensures stable 20 V/V transfer function across −40°C to +125°C.
It features buffered rail-to-rail output drive capability, 450 kHz bandwidth at 20 V/V gain, and 1.4–1.8 V/µs slew rate depending on supply voltage - optimized for fast transient response in overcurrent protection circuits without requiring external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 20 V/V - eliminates gain-setting resistor tolerance errors and simplifies PCB layout for production-grade current measurement. |
| Common-Mode Input Range | −2 V to +42 V - supports high-side sensing in 12 V, 24 V, and 36 V industrial bus systems, including negative rail fault detection. |
| Input Offset Voltage | ±900 µV max at 25°C - enables accurate sub-100 mV sense voltage detection (e.g., 5 mΩ shunt @ 20 A = 100 mV) with <1% total error contribution. |
| Gain Error | ±0.25% max - ensures calibrated current readout remains within ±0.5% full-scale error across temperature without system-level recalibration. |
| CMRR | 103 dB (2.1 V–42 V) - suppresses common-mode noise from switching regulators or noisy power rails, preserving signal integrity in EMI-prone environments. |
| Supply Voltage Range | 2.7 V to 12 V - compatible with single-supply microcontrollers and low-voltage logic interfaces while maintaining full common-mode range. |
| Bandwidth | 950 kHz at 20 V/V gain (VS = 2.7 V) - supports fast overcurrent response for motor phase current limiting and DC-DC converter cycle-by-cycle protection. |
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 voltage | Buffered rail-to-rail output capable of driving 1 MΩ load; requires ≤30 pF capacitive load for stability. |
| 2 - V− | Negative supply reference | Connect directly to system ground or negative rail; serves as output swing reference and bias return path. |
| 3 - +IN | Positive differential input | High-impedance node connected to high-side of sense resistor; accepts up to +42 V common-mode voltage. |
| 4 - −IN | Negative differential input | High-impedance node connected to low-side of sense resistor; maintains matched input impedance with +IN. |
| 5 - NC | No internal connection | Unbonded die pad; must be left floating or grounded per layout guidelines - no electrical function. |
| 6 - V+ | Positive supply voltage | Accepts 2.7 V–12 V; decoupling capacitor (0.1 µF) required close to pin for PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 20 V/V gain | Guarantees ±0.25% gain accuracy over temperature - eliminates calibration drift in long-life industrial equipment. |
| −2 V to +42 V common-mode range | Enables direct high-side sensing on 36 V battery systems and 48 V telecom rails without level-shifting circuitry. |
| 900 µV max input offset | Supports accurate 10-bit ADC interfacing with ≤1 LSB error when measuring 50 mV sense voltage (e.g., 10 A through 5 mΩ). |
| 103 dB CMRR (2.1 V–42 V) | Maintains >60 dB rejection of PWM noise from adjacent MOSFET switches, critical for clean current waveform capture. |
| 450 kHz bandwidth | Resolves 100 kHz current ripple components in switched-mode power supplies - sufficient for most motor control sampling rates. |
Applications
| Industrial Power Supply Monitoring | Automotive Battery Management |
|---|---|
Use Scenario: Real-time current monitoring in 24 V industrial DC-DC converters for overload shutdown and efficiency reporting. 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 ±0.5% full-scale current accuracy across −40°C to +85°C ambient without recalibration, reducing BOM cost versus programmable alternatives. |
Use Scenario: Bidirectional battery pack current sensing in 12 V vehicle subsystems (e.g., ADAS camera modules, infotainment). IC Role / Device Role / Timing Role: Precision current monitor interfaced to automotive-grade MCU with integrated 12-bit SAR ADC. Use Value: −2 V to +42 V common-mode range supports reverse-polarity protection and cold-cranking voltage transients down to −2 V. |
| Motor Phase Current Sensing | Server PSU Current Protection |
Use Scenario: Three-phase BLDC motor controller using shunt-based current feedback for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-bandwidth (950 kHz) current amplifier feeding isolated sigma-delta modulator or fast ADC. Use Value: 1.4–1.8 V/µs slew rate ensures <1 µs settling for 100 mV step inputs - critical for cycle-by-cycle overcurrent trip timing. |
Use Scenario: Primary-side current limiting in 48 V server power supplies with digital PMBus control. IC Role / Device Role / Timing Role: Analog current sense front-end providing isolated feedback to digital controller via precision ADC. Use Value: 0.25% gain error and 900 µV offset enable compliance with IEC 62368-1 fault current accuracy requirements for Class II safety isolation. |
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, −5 V to +80 V common-mode, 120 kHz bandwidth, 50 µV offset | Better offset and wider common-mode range but lower bandwidth limits use in fast-switching SMPS | Select for ultra-low-offset precision in 48 V telecom systems where bandwidth <200 kHz suffices |
| MAX4080TASA+ | 20 V/V gain, −0.1 V to +76 V common-mode, 250 kHz bandwidth, 120 µV offset | Lower offset and higher common-mode rating, but requires dual supply or charge pump for negative rail support | Prefer for battery-powered portable equipment needing sub-100 µV offset and operation down to −0.1 V common-mode |
Compared with INA240A1IDR and MAX4080TASA+, the LMP8640MKE-T/NOPB offers superior bandwidth (950 kHz vs. ≤250 kHz) and true single-supply operation down to −2 V common-mode, making it optimal for high-speed industrial motor control and cost-sensitive 24 V/36 V power systems where moderate offset is acceptable.
Availability
LMP8640MKE-T/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery management systems, and motor control designs requiring stable component supply, long-term manufacturability, and guaranteed RoHS-compliant sourcing.
Supply support for LMP8640MKE-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 signal conditioning and power management ICs.
The LMP8640 series was designed specifically for high-accuracy, high-common-mode current sensing in industrial, automotive, and computing power systems - prioritizing gain stability, thermal drift performance, and robust EMC behavior over general-purpose op-amp flexibility.
FAQ
What is the maximum common-mode voltage supported by the LMP8640MKE-T/NOPB?
The LMP8640MKE-T/NOPB supports a common-mode input voltage range of −2 V to +42 V. This specification is validated per TI's SNOSB28G datasheet and enables reliable high-side sensing in 36 V battery systems and industrial 24 V/48 V rails, including fault conditions such as negative transients during load dump.
Does the LMP8640MKE-T/NOPB require external gain-setting resistors?
No. The LMP8640MKE-T/NOPB has a factory-trimmed fixed gain of 20 V/V. Its internal RIN resistors (5 kΩ each) and RG = 2×RIN configuration eliminate the need for external gain components, reducing PCB area, component count, and gain drift due to resistor temperature coefficients - a key advantage over programmable current sense amplifiers.
Can the LMP8640MKE-T/NOPB operate from a 3.3 V supply?
Yes. The LMP8640MKE-T/NOPB operates from 2.7 V to 12 V supply voltage. At 3.3 V, it maintains full −2 V to +42 V common-mode range and delivers 950 kHz bandwidth with 1.4 V/µs slew rate, making it compatible with 3.3 V microcontrollers and low-voltage logic interfaces without level shifters.
What is the purpose of the NC pin (Pin 5) on the LMP8640MKE-T/NOPB?
Pin 5 is Not Connected (NC) - it has no internal bond wire or die connection. Per TI's datasheet, it must be left unconnected or tied to ground for mechanical stability; routing traces or vias to this pin may cause parasitic coupling or solder wicking issues that degrade high-frequency CMRR performance.
How does the LMP8640MKE-T/NOPB handle output capacitive loading?
The LMP8640MKE-T/NOPB is stable with up to 30 pF output capacitance. Exceeding this value risks peaking or oscillation due to phase margin reduction. For driving longer traces or ADC input filters, TI recommends using a series resistor (e.g., 10–50 Ω) between VOUT and the load to isolate capacitance - a practice confirmed in the SNOSB28G layout guidelines.
LMP8640MKE-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
LMP8640MKE-T/NOPB FAQ
1.How can I place an order for LMP8640MKE-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640MKE-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 LMP8640MKE-T/NOPB reliable?
The price and inventory of LMP8640MKE-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 LMP8640MKE-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640MKE-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640MKE-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640MKE-T/NOPB?
LMP8640MKE-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640MKE-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 LMP8640MKE-T/NOPB?
For technical support, including LMP8640MKE-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640MKE-T/NOPB requirements.
6.How does Aetrix verify that LMP8640MKE-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640MKE-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 LMP8640MKE-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640MKE-T/NOPB?
All LMP8640MKE-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640MKE-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 LMP8640MKE-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8640MKE-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP8640MKE-T/NOPB Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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…
