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Analog Devices Inc. LT1787HVCMS8#PBF
- Part No.:
- LT1787HVCMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1787HVCMS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:238
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Product details
Overview
LT1787HVCMS8#PBF from Analog Devices (acquired Linear Technology) is a precision high-side current sense amplifier optimized for bidirectional sensing in industrial and automotive power systems. It features 8× fixed gain, ±100µV max input offset voltage over –40°C to 125°C, 60V supply operation, 12-bit dynamic range, and 60µA quiescent current - enabling accurate battery charge/discharge monitoring in 48V telecom or EV auxiliary supplies.
For engineers reviewing the LT1787HVCMS8#PBF datasheet, LT1787HVCMS8#PBF pinout, LT1787HVCMS8#PBF application, or LT1787HVCMS8#PBF equivalent, key selection criteria include high-voltage common-mode rejection (120dB PSRR), MSOP-8 thermal performance (θJA = 250°C/W), unidirectional/bidirectional output flexibility, and Kelvin-sense compatibility for sub-2mA resolution at low currents.
Technical Context
The LT1787HVCMS8#PBF employs a matched resistor-based current mirror architecture with internal 1.25kΩ gain-setting resistors (RG1A/RG2A) and 20kΩ output resistor (ROUT), delivering precise 8× VSENSE amplification independent of supply voltage. Its differential FIL+/FIL– pins enable user-configurable RC filtering (f–3dB = 1/(2π·1.25kΩ·C)) to suppress high-frequency noise above 300kHz bandwidth.
Operation supports both split-supply (VEE referenced) and single-supply (VBIAS-shifted) configurations: VOUT = 8·VSENSE + VBIAS + VOUT(O), with output swing limited to 30mV above VEE and VS+ – 0.75V. Input bias currents (IS+ = 10–25µA, IS– = 50–115µA) are specified across –40°C to 125°C for robust high-temp design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 60V total supply - enables direct monitoring of 48V bus or battery stacks without level-shifting. |
| Input Offset Voltage (Max) | ±100µV over –40°C to 125°C - ensures ≤2mA error at 20mΩ sense resistor, critical for low-current battery state-of-charge accuracy. |
| Fixed Gain | 8× (7.76–8.24 V/V) - eliminates external gain-setting components and reduces layout sensitivity to parasitic capacitance. |
| Quiescent Current | 60µA - allows continuous monitoring in always-on systems (e.g., EV BMS sleep mode) with negligible battery drain. |
| PSRR | 120dB (2.5V–60V range) - rejects supply ripple in noisy DC/DC converter outputs, preserving measurement integrity. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial motor drive environments. |
| Package | 8-Lead MSOP - compact footprint (3mm × 3mm) with 250°C/W junction-to-ambient thermal resistance for high-power density layouts. |
Pinout & Package
LT1787HVCMS8#PBF uses an 8-lead MSOP package (JEDEC MO-187AA) with exposed pad for thermal enhancement. Pin 3 (DNC) is internally connected and must remain unconnected per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ / FIL– (1, 8) | Differential input filter nodes | Internally tied to RG1/RG2 midpoints; capacitor between them sets low-pass cutoff (e.g., 0.01µF → 12.7kHz) to reject switching noise. |
| VS– (2) | Negative sense input | Connects to low-side of sense resistor; sources bias current (10–25µA) that may be included in monitored current path. |
| DNC (3) | Do Not Connect | Internally bonded; external connection risks parametric shift or damage - leave floating. |
| VEE (4) | Negative supply / ground reference | For split-supply operation: connect to negative rail; for single-supply: tie to system ground. |
| VOUT (5) | Current/voltage output | Sinks/sourcing current proportional to |ISENSE|; develops output voltage across ROUT (20kΩ) with VBIAS as level-shift reference. |
| VBIAS (6) | Output bias reference | Set to midpoint voltage (e.g., 1.25V) for bidirectional single-supply operation; defines zero-current output level. |
| VS+ (7) | Positive sense input | Connects to high-side of sense resistor; sinks bias current (50–115µA); polarity determines VOUT direction relative to VBIAS. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Enables charge/discharge current monitoring in battery management without ground-referenced shunt placement. |
| User-selectable external sense resistor | Supports RSENSE optimization from 1mΩ (high-current) to 100mΩ (low-power), with ±500mV full-scale input headroom. |
| Input noise filtering via FIL+/FIL– | Eliminates aliasing errors from PWM switching frequencies (e.g., 100kHz–1MHz) using simple external capacitor. |
| 12-bit dynamic range | Delivers >4096:1 current ratio resolution - sufficient for detecting 1A fault current within 4000A traction inverter stack. |
| –40°C to 125°C guaranteed operation | Validated performance across full automotive temperature range without derating, reducing thermal margin uncertainty. |
Applications
| Battery Management Systems | Industrial Motor Drives |
|---|---|
Use Scenario: Monitoring bidirectional current in 48V Li-ion battery packs for EV auxiliary systems and data center UPS. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, Kelvin-connected feedback to MCU ADC. Use Value: ±100µV offset enables <2mA resolution at 20mΩ shunt, supporting precise state-of-charge estimation over full temperature range. |
Use Scenario: Sensing phase current in 3-phase IGBT inverters for HVAC compressors and pump controllers. IC Role / Device Role / Timing Role: High-common-mode-voltage current monitor interfacing with isolation amplifiers or sigma-delta ADCs. Use Value: 60V supply rating and 120dB PSRR maintain accuracy despite 400V DC bus ripple and fast IGBT switching transients. |
| Telecom Power Supplies | Portable Medical Devices |
Use Scenario: Real-time load current monitoring in 48V/–48V telecom rectifiers and distributed power architectures. IC Role / Device Role / Timing Role: Precision current sensor feeding digital power management ICs for adaptive load shedding. Use Value: 60µA quiescent current minimizes standby loss in always-on network equipment, extending uptime during grid outages. |
Use Scenario: Battery discharge profiling in portable ultrasound and infusion pumps requiring FDA-grade current accuracy. IC Role / Device Role / Timing Role: Low-drift, high-linearity current amplifier conditioning signal for 16-bit SAR ADC acquisition. Use Value: 0.5–4µV/°C VOS TC ensures <0.1% gain error drift over clinical operating temperatures (10°C–40°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDGKRQ1 | 500kHz bandwidth vs LT1787's 300kHz; 2.5µV/°C VOS TC vs 0.5–4µV/°C; AEC-Q100 qualified. | Better suited for high-speed motor control loops; requires external gain resistors for non-standard gains. | Select for automotive ASIL-B systems needing qualification; avoid if fixed 8× gain and ultra-low tempco are mandatory. |
| MAX4080TASA+ | Single-ended output only; 2.7V–76V supply; 125µV max VOS at 125°C; no FIL+/FIL– filtering pins. | Lower cost for unidirectional monitoring; lacks bidirectional output flexibility and integrated noise filtering. | Choose for cost-sensitive 48V power supplies where bidirectional sensing and EMI filtering are not required. |
Compared with INA240A1QDGKRQ1 and MAX4080TASA+, the LT1787HVCMS8#PBF provides superior temperature stability (0.5µV/°C min VOS TC), integrated filtering, and guaranteed 12-bit dynamic range - making it optimal for precision battery analytics and low-drift industrial instrumentation where gain accuracy and thermal drift dominate selection.
Availability
LT1787HVCMS8#PBF is available at Aetrix Electronics and suitable for battery management systems, industrial motor drives, and telecom power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1787HVCMS8#PBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1787 family was developed by Linear Technology (acquired by ADI in 2017) specifically for precision high-side current sensing in harsh environments - emphasizing ultra-low offset drift, wide supply range, and Kelvin-compatible layout for metrology-grade power monitoring.
FAQ
What is the maximum common-mode voltage the LT1787HVCMS8#PBF can handle?
The LT1787HVCMS8#PBF supports up to 60V total supply voltage (VS+ to VEE), enabling operation with common-mode voltages up to 60V above ground when configured in high-side sensing. Absolute maximum differential sense voltage is ±10V, and absolute maximum total supply is 65V - exceeding typical 48V industrial and automotive bus requirements.
Does the LT1787HVCMS8#PBF require external gain-setting resistors?
No, the LT1787HVCMS8#PBF has onboard precision 1.25kΩ gain-setting resistors (RG1A/RG2A) that fix the gain at 8×. This eliminates external resistor matching errors and layout sensitivity, ensuring consistent 7.76–8.24 V/V gain across temperature and process variation - a key differentiator versus programmable current sense amplifiers.
How does the FIL+ and FIL– functionality improve noise immunity in the LT1787HVCMS8#PBF?
The FIL+ and FIL– pins on the LT1787HVCMS8#PBF connect internally to the midpoints of RG1 and RG2, allowing a single capacitor between them to form a differential low-pass filter. With R = 1.25kΩ, a 0.01µF capacitor sets f–3dB = 12.7kHz - effectively attenuating high-frequency switching noise from DC/DC converters or motor drives before it reaches the core amplifier.
Can the LT1787HVCMS8#PBF operate in bidirectional mode with a single 5V supply?
Yes, the LT1787HVCMS8#PBF supports bidirectional sensing with single-supply operation by biasing the VBIAS pin to a midpoint voltage (e.g., 2.5V using a resistor divider or LT1634 reference). In this configuration, VOUT swings symmetrically around VBIAS - positive for VS+ > VS–, negative for VS+ < VS– - enabling full-range current direction detection without dual rails.
What is the thermal performance of the LT1787HVCMS8#PBF in its MSOP-8 package?
The LT1787HVCMS8#PBF in MSOP-8 has a junction-to-ambient thermal resistance (θJA) of 250°C/W. At 60µA quiescent current and typical 8× gain operation, power dissipation remains below 3mW - resulting in negligible self-heating (<0.8°C rise) even in sealed enclosures, preserving offset stability and long-term calibration integrity.
LT1787HVCMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 60µA
- Current - Output / Channel:
- 50 µA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 60 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1787HVCMS8#PBF FAQ
1.How can I place an order for LT1787HVCMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787HVCMS8#PBF 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 LT1787HVCMS8#PBF reliable?
The price and inventory of LT1787HVCMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787HVCMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787HVCMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787HVCMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787HVCMS8#PBF?
LT1787HVCMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787HVCMS8#PBF 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 LT1787HVCMS8#PBF?
For technical support, including LT1787HVCMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787HVCMS8#PBF requirements.
6.How does Aetrix verify that LT1787HVCMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787HVCMS8#PBF 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 LT1787HVCMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787HVCMS8#PBF?
All LT1787HVCMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787HVCMS8#PBF, 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 LT1787HVCMS8#PBF part is unused and in its original packaging.
Return procedure for LT1787HVCMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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