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Texas Instruments LMP8640HVMKX-T/NOPB
- Part No.:
- LMP8640HVMKX-T/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMP8640HVMKX-T/NOPB.pdf
- Description:
- IC CURR SENSE 1CIRC SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:1,605
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Product details
Overview
LMP8640HVMKX-T/NOPB from Texas Instruments is a precision high-voltage current sense amplifier with fixed 20 V/V gain, -2 V to +76 V common-mode input range, 0.25% max gain error, 900 µV input offset voltage, and 6-pin SOT-23 package. It enables accurate high-side current monitoring in industrial power supplies and battery management systems where wide common-mode voltage and temperature-stable gain are critical.
For engineers reviewing the LMP8640HVMKX-T/NOPB datasheet, LMP8640HVMKX-T/NOPB pinout, LMP8640HVMKX-T/NOPB application, or LMP8640HVMKX-T/NOPB equivalent, key selection criteria include its extended 76 V common-mode capability versus standard 42 V variants, guaranteed 20 V/V fixed gain accuracy over -40°C to +125°C, and compatibility with low-impedance sense resistors down to 5 kΩ differential input impedance.
Technical Context
The LMP8640HVMKX-T/NOPB implements a precision instrumentation amplifier topology optimized for high-side sensing, using matched internal resistors (RIN = 5 kΩ) and feedback resistor ratio (RG = 2×RIN) to achieve fixed 20 V/V gain without external components. Its input stage operates with rail-to-rail common-mode range extending 2 V below ground, enabling detection of reverse current flow.
It features buffered voltage output with low output impedance, 85 dB PSRR, and 103 dB CMRR over 2.1 V–42 V common-mode range-critical for rejecting noise in noisy DC bus environments. The device maintains stable operation across 2.7 V–12 V supply voltage and delivers 1.8 V/µs slew rate at 12 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 20 V/V - eliminates external gain-setting resistors and associated tolerance/temperature drift errors |
| Common-Mode Range | -2 V to +76 V - supports high-side sensing on 48 V, 60 V, and 72 V industrial and telecom power rails |
| Max Gain Error | ±0.25% - ensures <1 mV absolute error at 100 mV input for ±1% current measurement accuracy |
| Input Offset Voltage | ±900 µV - enables resolution of sub-10 mA currents with 100 mΩ sense resistor |
| Supply Voltage Range | 2.7 V to 12 V - compatible with single-supply microcontrollers and isolated bias rails |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions |
| Package | SOT-23-6 (2.9 mm × 1.6 mm) - surface-mount footprint suitable for space-constrained PCB layouts |
Pinout & Package
Package: 6-pin Thin SOT-23 (DDC0006A), body size 2.9 mm × 1.6 mm, 0.95 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Amplified output | Buffered voltage output referenced to V−; drives ADC inputs or comparator thresholds directly |
| V− | Negative supply | Ground or negative rail reference; supports operation with inputs down to -2 V relative to this pin |
| +IN | Positive input | High-impedance node connected to high-side of sense resistor; accepts up to +76 V common-mode |
| -IN | Negative input | High-impedance node connected to low-side of sense resistor; forms differential pair with +IN |
| NC | No connect | Internally unconnected pin; must be left floating or tied to V− for mechanical stability |
| V+ | Positive supply | Single positive supply input (2.7–12 V); powers internal amplifier and output buffer |
Key Features
| Feature | Design Value |
|---|---|
| Extended common-mode range | Supports sensing on 72 V DC buses with 2 V headroom below ground for reverse-current detection |
| Fixed-gain architecture | Eliminates external resistor networks, reducing BOM count and layout sensitivity to parasitic capacitance |
| Low input offset drift | 2.6 µV/°C TCVOS ensures <3.3 mV total offset shift over full -40°C to +125°C range |
| High CMRR at elevated VCM | 95 dB CMRR maintained up to +76 V common-mode enables accurate sensing in high-noise motor drive inverters |
| Robust ESD rating | ±2000 V HBM allows safe handling in standard manufacturing environments without special precautions |
Applications
| Industrial Power Supply Monitoring | Telecom 48 V / 72 V Battery Backup |
|---|---|
Use Scenario: Real-time current monitoring of primary-side DC bus in 48 V/60 V industrial SMPS units to detect overload and short-circuit faults. IC Role / Device Role / Timing Role: High-side current sense amplifier converting mV-level sense resistor voltage into scalable 0–4 V analog output for MCU ADC sampling. Use Value: Enables fast (<1 µs response) fault detection with ±1% current accuracy across full temperature range and line voltage variation. | Use Scenario: Bidirectional current measurement in telecom battery backup systems where VCM reaches +72 V during float charge and drops to -1.5 V during discharge reversal. IC Role / Device Role / Timing Role: Precision current sense amplifier providing isolated analog feedback to battery management controller with support for negative common-mode. Use Value: Accurate state-of-charge estimation and cell balancing control via 20 V/V gain and -2 V to +76 V input range. |
| Motor Drive Phase Current Sensing | EV Onboard Charger Input Stage |
Use Scenario: High-side shunt-based phase current sensing in 3-phase BLDC inverters operating from 400 V DC link with switching noise up to 100 kHz. IC Role / Device Role / Timing Role: High-CMRR current sense amplifier rejecting PWM-induced common-mode transients while preserving signal integrity. Use Value: 103 dB CMRR at 2.1–42 V VCM and 1.8 V/µs slew rate enable clean current waveforms for FOC algorithms. | Use Scenario: Input current monitoring in 6.6 kW EV onboard chargers where AC-DC front-end operates at 400–800 V DC bus with high dV/dt noise. IC Role / Device Role / Timing Role: High-voltage current sense amplifier interfacing between shunt resistor and isolation amplifier input stage. Use Value: 76 V common-mode rating accommodates worst-case transient overshoots; 30 pF max capacitive load ensures stability with optocoupler input capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDGKRQ1 | 50 V/V fixed gain, -4 V to +80 V common-mode, AEC-Q100 Grade 1 qualified | Automotive-grade variant with wider common-mode and lower offset (±20 µV typ), but requires higher minimum supply (2.7–5.5 V only) | Select for automotive traction inverters requiring AEC-Q100 qualification and tighter offset spec |
| LMP8640MKX-T/NOPB | Same 20 V/V gain and SOT-23-6 package, but limited to -2 V to +42 V common-mode | Cost-optimized version for 24 V/36 V industrial systems where 76 V rating is unnecessary | Select when 42 V common-mode suffices and cost sensitivity outweighs extended voltage margin |
Compared with INA240A1QDGKRQ1, LMP8640HVMKX-T/NOPB offers broader supply range (up to 12 V) and higher PSRR (85 dB), while LMP8640MKX-T/NOPB reduces cost by omitting HV process but sacrifices 34 V common-mode headroom needed for 72 V systems.
Availability
LMP8640HVMKX-T/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom battery backup systems, and EV onboard charger designs requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LMP8640HVMKX-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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LMP8640HV product line was designed specifically for high-voltage current sensing in industrial power conversion and battery systems where extended common-mode range and fixed-gain precision are mandatory.
FAQ
What is the maximum common-mode voltage supported by the LMP8640HVMKX-T/NOPB?
The LMP8640HVMKX-T/NOPB supports a maximum common-mode voltage of +76 V and a minimum of -2 V, enabling high-side sensing on 72 V DC systems with margin for transients. This exceeds the +42 V limit of standard LMP8640 variants and is confirmed in Section 7.1 Absolute Maximum Ratings and Section 8.1 Overview of the official datasheet SNOSB28G.
Does the LMP8640HVMKX-T/NOPB require external gain-setting resistors?
No, the LMP8640HVMKX-T/NOPB has an internally fixed 20 V/V gain achieved via precision-matched thin-film resistors (RIN = 5 kΩ, RG = 2×RIN). No external resistors are needed, eliminating gain error sources from component tolerance, temperature drift, and PCB layout parasitics-confirmed in the Simplified Schematic and Feature Description sections of SNOSB28G.
What is the input offset voltage specification for the LMP8640HVMKX-T/NOPB over temperature?
The LMP8640HVMKX-T/NOPB has a maximum input offset voltage of ±1160 µV over the full -40°C to +125°C operating range, with typical value ±900 µV at 25°C. Its offset drift is 2.6 µV/°C, resulting in ≤3.3 mV total offset variation across temperature-verified in Electrical Characteristics Tables 7.6–7.8 of SNOSB28G.
Can the LMP8640HVMKX-T/NOPB operate from a 3.3 V supply?
Yes, the LMP8640HVMKX-T/NOPB operates from 2.7 V to 12 V supply voltage. At 3.3 V, it maintains full functionality including 20 V/V gain, -2 V to +76 V common-mode range, and 950 kHz bandwidth (per Table 7.6), making it compatible with 3.3 V microcontroller systems-confirmed in Recommended Operating Conditions (Section 7.4) and Electrical Characteristics tables.
Is the NC pin on the LMP8640HVMKX-T/NOPB required to be connected?
No, Pin 5 (NC) is not internally connected and must remain unconnected. TI's Pin Configuration and Functions section explicitly states "Not Internally Connected." Floating the pin is acceptable; tying it to V− is permissible for mechanical stability but provides no electrical benefit-documented in Section 6 of SNOSB28G.
LMP8640HVMKX-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
LMP8640HVMKX-T/NOPB FAQ
1.How can I place an order for LMP8640HVMKX-T/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP8640HVMKX-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 LMP8640HVMKX-T/NOPB reliable?
The price and inventory of LMP8640HVMKX-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 LMP8640HVMKX-T/NOPB is usually 5 days.
3.What payment methods are accepted for LMP8640HVMKX-T/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP8640HVMKX-T/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP8640HVMKX-T/NOPB?
LMP8640HVMKX-T/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP8640HVMKX-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 LMP8640HVMKX-T/NOPB?
For technical support, including LMP8640HVMKX-T/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP8640HVMKX-T/NOPB requirements.
6.How does Aetrix verify that LMP8640HVMKX-T/NOPB is sourced from the original manufacturer or authorized distributors?
All LMP8640HVMKX-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 LMP8640HVMKX-T/NOPB meets industry standards.
7.What is the process for return or replacement of LMP8640HVMKX-T/NOPB?
All LMP8640HVMKX-T/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMP8640HVMKX-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 LMP8640HVMKX-T/NOPB part is unused and in its original packaging.
Return procedure for LMP8640HVMKX-T/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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