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Texas Instruments LMP8640QMKE-T/NOPB
- Part No.:
- LMP8640QMKE-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640QMKE-T/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,615
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Product details
Overview
LMP8640QMKE-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, 900 µV input offset voltage, and 6-pin SOT-23 package - designed for accurate DC/AC current monitoring in battery-powered industrial power supplies and motor control feedback loops.
For engineers reviewing the LMP8640QMKE-T/NOPB datasheet, LMP8640QMKE-T/NOPB pinout, LMP8640QMKE-T/NOPB application, or LMP8640QMKE-T/NOPB equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and electrical behavior across temperature and supply conditions, and real-world substitution guidance for high-voltage sensing designs.
Technical Context
The LMP8640QMKE-T/NOPB implements a high-precision current-sense topology using matched internal resistors (RIN = 5 kΩ) and a low-drift amplifier core. Its differential input stage rejects common-mode voltages up to +42 V while maintaining 103 dB CMRR over 2.1 V–42 V VCM range and 85 dB PSRR across 2.7 V–12 V supply.
It operates as a single-supply device with rail-to-rail output capability, delivering buffered voltage output scaled by fixed 20× gain. Input bias current remains ≤22 µA across temperature, and output drives ≥1 MΩ loads with ≤30 pF capacitive load stability - enabling direct interface to ADCs without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 20 V/V - eliminates external gain-setting components and ensures ±0.25% accuracy at 25°C |
| Common-Mode Range | -2 V to +42 V - supports high-side sensing in 12 V, 24 V, and 36 V systems with negative transient tolerance |
| Input Offset Voltage | ±900 µV max at 25°C - enables accurate detection of sub-100 mV sense voltages (e.g., 5 mΩ shunt @ 20 A) |
| Supply Voltage Range | 2.7 V to 12 V - compatible with Li-ion, 3.3 V logic, and 5 V/12 V industrial rails |
| Bandwidth | 950 kHz - supports fast current transients in motor phase current sensing and overcurrent protection |
| Output Drive | Buffered rail-to-rail output - sinks/sours ≥1 mA while maintaining linearity; interfaces directly to SAR or delta-sigma ADCs |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive under-hood 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 |
|---|---|---|
| 1 - VOUT | Amplified output | Buffered voltage output scaled by 20×; drives ADC inputs or comparator thresholds directly |
| 2 - V− | Negative supply | Ground reference for single-supply operation; must be connected to system GND or low-side return |
| 3 - +IN | Positive input | Connects to high-side of sense resistor; accepts common-mode voltages up to +42 V |
| 4 - −IN | Negative input | Connects to low-side of sense resistor; differential input rejects common-mode noise |
| 5 - NC | No connect | Not internally bonded; must be left floating or tied to GND per layout best practices |
| 6 - V+ | Positive supply | Single supply input (2.7–12 V); powers amplifier core and output buffer |
Key Features
| Feature | Design Value |
|---|---|
| High CMRR at full range | 103 dB (2.1 V–42 V VCM) - maintains accuracy despite bus voltage ripple or ground bounce |
| Low input offset drift | 2.6 µV/°C - limits total error to <2.5 mV over -40°C to +125°C for 100 mV sense voltage |
| Stable small-signal response | 950 kHz bandwidth with 1.8 V/µs slew rate at 12 V supply - resolves fast current spikes in PWM-driven loads |
| Robust ESD rating | ±2000 V HBM - withstands handling and board-level transients without latch-up or parametric shift |
| Fixed-gain topology | No external resistors required - eliminates gain-setting errors, layout sensitivity, and thermal mismatch |
Applications
| Motor Phase Current Sensing | Battery Pack Charge/Discharge Monitoring |
|---|---|
Use Scenario: Real-time measurement of individual phase currents in 3-phase BLDC motor drives operating from 24 V bus with PWM switching. IC Role / Device Role / Timing Role: High-side current sense amplifier converting mV-level shunt voltage to clean, amplified analog signal for ADC sampling at 100 kSPS. Use Value: Enables precise field-oriented control (FOC) with <1% current measurement error across temperature and bus voltage variation. |
Use Scenario: Bidirectional current monitoring in 48 V lithium-ion battery packs for energy management systems (BMS) in UPS and telecom backup units. IC Role / Device Role / Timing Role: High-side sensing element feeding isolated ADCs to compute net charge/discharge current with ±0.5% full-scale accuracy. Use Value: Supports Coulomb counting with <0.1% offset-induced drift over 10-year service life under thermal cycling. |
| Industrial Power Supply OCP | DC-DC Converter Output Current Limiting |
Use Scenario: Overcurrent protection circuit in 36 V industrial SMPS where primary-side sensing must survive 42 V transients during load dump. IC Role / Device Role / Timing Role: Fast-response current monitor triggering shutdown within 2 µs of fault onset via comparator interface. Use Value: Achieves <500 ns propagation delay from sense event to output assertion, meeting IEC 61000-4-4 surge immunity requirements. |
Use Scenario: Output current limiting in isolated 12 V → 3.3 V flyback converter powering FPGA I/O banks with strict current compliance. IC Role / Device Role / Timing Role: Secondary-side high-side sense amplifier feeding error amplifier to regulate peak current during pulse-skipping mode. Use Value: Maintains ±1.2% current limit accuracy from 0.5 A to 10 A across 0–85°C ambient, eliminating need for calibration. |
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 | 20 V/V gain, -4 V to +80 V VCM, 50 kHz bandwidth, 50 µV offset | Automotive AEC-Q100 Grade 1; lower bandwidth but superior offset and drift | Preferred for automotive battery disconnect units requiring <10 µV/°C drift and extended VCM margin |
| MAX4080TASA+ | 20 V/V gain, -10 V to +76 V VCM, 250 kHz bandwidth, 100 µV offset | Higher VCM range and lower offset, but requires dual supply or level-shifting for single-ended ADC interface | Selected when sensing below ground (e.g., negative rail monitoring) and ultra-low offset dominates bandwidth needs |
Compared with LMP8640QMKE-T/NOPB, the INA240A1QDRQ1 offers tighter DC accuracy and automotive qualification at the cost of bandwidth, while the MAX4080TASA+ extends common-mode range downward to -10 V but introduces supply complexity - making LMP8640QMKE-T/NOPB optimal for cost-sensitive industrial 24–42 V systems needing balanced speed, accuracy, and simplicity.
Availability
LMP8640QMKE-T/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, battery management systems, and DC-DC converter protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMP8640QMKE-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 delivering analog and embedded processing solutions, with deep expertise in precision signal chain and power management ICs.
The LMP8640QMKE-T/NOPB belongs to TI's precision current sense amplifier product line, engineered specifically for high-accuracy, high-common-mode industrial and automotive current monitoring with minimal external components.
FAQ
What is the maximum common-mode voltage supported by the LMP8640QMKE-T/NOPB?
The LMP8640QMKE-T/NOPB supports a common-mode input voltage range of -2 V to +42 V. This allows it to accurately sense current on high-side shunts in 24 V and 36 V industrial systems, including transient overvoltage conditions such as load dump. The specification is guaranteed across the full -40°C to +125°C operating temperature range.
Does the LMP8640QMKE-T/NOPB require external gain-setting resistors?
No, the LMP8640QMKE-T/NOPB features a factory-trimmed fixed gain of 20 V/V. Its internal resistor network (RIN = 5 kΩ) and amplifier architecture eliminate the need for external gain components, reducing PCB area, component count, and potential errors from resistor tolerance or thermal drift - a key advantage over programmable current sense amplifiers.
Can the LMP8640QMKE-T/NOPB operate from a 3.3 V supply?
Yes, the LMP8640QMKE-T/NOPB operates from 2.7 V to 12 V supply. At 3.3 V, it delivers rail-to-rail output swing (typically 40 mV to 3.25 V), maintains 950 kHz bandwidth, and retains full common-mode rejection - making it suitable for low-voltage microcontroller-based systems interfacing directly to 3.3 V ADCs without level shifting.
What is the input impedance of the LMP8640QMKE-T/NOPB differential inputs?
The LMP8640QMKE-T/NOPB has a differential input impedance of 5 kΩ, defined by its internal RIN resistors. This value is fixed and process-trimmed, ensuring consistent loading on the sense resistor across temperature and unit variance - critical for maintaining gain accuracy and minimizing measurement error in precision shunt-based designs.
Is the LMP8640QMKE-T/NOPB pin-compatible with other variants in the LMP8640 family?
Yes, all LMP8640-x variants (including LMP8640-F, LMP8640-H, and LMP8640-Q1) share identical 6-pin SOT-23 pinout and footprint. The LMP8640QMKE-T/NOPB (20 V/V gain) can be substituted with LMP8640MKE-F (50 V/V) or LMP8640MKE-H (100 V/V) without PCB changes - though gain scaling and bandwidth trade-offs must be verified in the target application.
LMP8640QMKE-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMP8640QMKE-T/NOPB FAQ
1.How can I place an order for LMP8640QMKE-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640QMKE-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 LMP8640QMKE-T/NOPB reliable?
The price and inventory of LMP8640QMKE-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 LMP8640QMKE-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640QMKE-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640QMKE-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640QMKE-T/NOPB?
LMP8640QMKE-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640QMKE-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 LMP8640QMKE-T/NOPB?
For technical support, including LMP8640QMKE-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640QMKE-T/NOPB requirements.
6.How does Aetrix verify that LMP8640QMKE-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640QMKE-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 LMP8640QMKE-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640QMKE-T/NOPB?
All LMP8640QMKE-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640QMKE-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 LMP8640QMKE-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8640QMKE-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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