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Analog Devices Inc. LT1787HVIMS8#PBF
- Part No.:
- LT1787HVIMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1787HVIMS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:332
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Product details
Overview
LT1787HVIMS8#PBF from Analog Devices (formerly Linear Technology) is a precision high-side current sense amplifier designed for bidirectional sensing in high-voltage systems. It features 60V total supply operation, 75µV max input offset voltage, fixed 8× gain, 12-bit dynamic range, and operates from –40°C to 125°C - enabling accurate battery monitoring and power management in automotive and industrial power supplies.
For engineers reviewing the LT1787HVIMS8#PBF datasheet, LT1787HVIMS8#PBF pinout, LT1787HVIMS8#PBF application, or LT1787HVIMS8#PBF equivalent, key selection considerations include its ±10V differential sense voltage rating, MSOP-8 package with DNC pin, unidirectional/bidirectional output configuration, VBIAS-referenced output swing, and compatibility with low-noise Kelvin-sense layouts.
Technical Context
The LT1787HVIMS8#PBF uses matched internal 1.25kΩ gain-setting resistors (RG1A/RG2A) and a transconductance architecture to deliver fixed 8× gain with >120dB PSRR across 2.5V–60V supply. Its FIL+/FIL– pins enable external RC filtering at f–3dB = 1/(2π × 1.25kΩ × C), supporting noise rejection in high-ripple environments.
It supports three output configurations: split-supply bipolar (VBIAS = GND), single-supply bidirectional (VBIAS externally biased), and unidirectional (VBIAS = GND). Output voltage swing is limited to VEE + 30mV (min) and VS+ – 0.75V (max), with ROUT = 20kΩ defining output impedance and gain accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Supply Voltage | 2.5V to 60V - enables direct sensing in 48V telecom, EV auxiliary systems, and industrial DC buses without level-shifting. |
| Input Offset Voltage (Max) | ±75 µV at 25°C - ensures ≤0.15% error at 500mV full-scale sense voltage, critical for low-current resolution. |
| Gain Accuracy | ±3% over temperature - fixed 8× gain set by laser-trimmed on-die resistors eliminates external gain-setting components. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor control applications. |
| Differential Sense Range | ±10V - supports high-side sensing across wide common-mode voltages, including battery stack monitoring. |
| Supply Current | 60 µA - ultra-low quiescent current extends runtime in portable and always-on power monitors. |
| PSRR | >120 dB - rejects supply ripple up to 60V, maintaining accuracy in noisy switching power supply environments. |
Pinout & Package
LT1787HVIMS8#PBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch) with exposed pad for thermal performance. Pin 3 (DNC) must remain unconnected per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ / FIL– (1, 8) | Differential input filter terminals | Internally connected to midpoints of RG1/RG2; capacitor between them forms anti-aliasing low-pass filter (f–3dB = 1/(2π × 1.25kΩ × C)). |
| VS– (2) | Negative sense input | Connects to low-side of sense resistor; supplies bias current to internal amplifier - included in measured current if polarity chosen accordingly. |
| DNC (3) | Do Not Connect | Internally connected; external connection violates absolute maximum ratings and invalidates performance specs. |
| VEE (4) | Negative supply / ground reference | Serves as return for negative supply or ground in single-supply mode; defines lower output swing limit (VEE + 30mV). |
| VOUT (5) | Current/voltage output node | Summed output of current mirror across ROUT = 20kΩ; delivers VOUT = 8 × VSENSE + VBIAS + VOUT(O) in bidirectional mode. |
| VBIAS (6) | Output bias reference | Set externally (e.g., LT1634-1.25) to establish zero-current output level; enables rail-to-rail bidirectional swing in single-supply systems. |
| VS+ (7) | Positive sense input | Connects to high-side of sense resistor; used to monitor supply current when load is connected between VS+ and VS–. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Supports both charge/discharge current monitoring in battery systems via VBIAS-referenced output polarity reversal. |
| User-selectable external RSENSE | Enables full-scale sense voltage tuning from ±10mV to ±500mV - balances resolution vs. I²R loss in 10A–100A applications. |
| Integrated input filtering (FIL+/FIL–) | Eliminates need for external op-amp-based filters; 12.7kHz cutoff with 0.01µF capacitor suppresses PWM switching noise. |
| 12-bit dynamic range | Combines 75µV offset and 500mV full-scale input to resolve <2mA at 100A full-scale - sufficient for BMS cell balancing control. |
| –40°C to +125°C guaranteed operation | Validated performance across full automotive under-hood and industrial ambient ranges without derating. |
Applications
| Battery Management Systems | Industrial Power Supplies |
|---|---|
Use Scenario: Monitoring bidirectional current in 48V lithium-ion battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: High-side current sense amplifier providing VOUT referenced to external VBIAS for ADC interfacing. Use Value: Enables precise state-of-charge estimation and overcurrent protection with <2mA resolution at 100A full-scale using 1mΩ shunt. |
Use Scenario: Real-time load current monitoring in programmable DC power supplies with 0–60V output range. IC Role / Device Role / Timing Role: High-common-mode-voltage current sensor feeding isolated sigma-delta ADC for digital control loop feedback. Use Value: Maintains 0.15% gain accuracy and >120dB PSRR despite 1Vpp 100kHz ripple on 60V bus - eliminating measurement corruption. |
| Automotive Body Control Modules | Portable Test Equipment |
Use Scenario: Fuseless short-circuit detection in 24V vehicle lighting and HVAC subsystems. IC Role / Device Role / Timing Role: Unidirectional high-side current monitor with fast step response (<10µs to 90%) for fault triggering. Use Value: Detects 15A faults within 2µs using 5mΩ shunt and comparator interface - faster than mechanical fuse response. |
Use Scenario: Precision current sourcing/sinking verification in handheld multimeters and calibrators. IC Role / Device Role / Timing Role: Reference-grade current sense element with <75µV offset for sub-100nA measurement resolution. Use Value: Achieves 12-bit effective resolution with LTC1286 ADC in unipolar mode - validated per IEEE Std 1057. |
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 |
|---|---|---|---|
| MAX4080TASA+ | Single-ended output only; 2.7V–76V supply; 100µV max VOS; no FIL+/FIL– filtering pins. | Lacks bidirectional capability and integrated input filtering - requires external op-amp for bipolar output. | Choose for cost-sensitive unidirectional 76V systems where filtering is handled upstream. |
| INA240A1QDRQ1 | Automotive-grade (AEC-Q100); 80V supply; 10µV max VOS; 120dB CMRR; no VBIAS pin or bidirectional output mode. | Fixed unidirectional output; superior offset but no native VBIAS-referenced swing - needs external level-shifting for bidirectional use. | Choose for ASIL-B automotive applications requiring lowest offset and highest CMRR, accepting added external circuitry. |
Compared with MAX4080TASA+ and INA240A1QDRQ1, the LT1787HVIMS8#PBF uniquely integrates bidirectional output configuration, on-chip gain-setting resistors, and dedicated FIL+/FIL– filtering - reducing BOM count and layout complexity in space-constrained battery and power supply designs.
Availability
LT1787HVIMS8#PBF is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, and automotive body control modules requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LT1787HVIMS8#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LT® product family, known for precision analog ICs with robust industrial and automotive qualification.
The LT1787HV series belongs to Linear's high-voltage precision current sensing portfolio, engineered specifically for accurate bidirectional monitoring in 48V–60V systems such as EV auxiliary power, telecom rectifiers, and industrial motor drives.
FAQ
What is the maximum differential sense voltage supported by the LT1787HVIMS8#PBF?
The LT1787HVIMS8#PBF supports a maximum differential sense voltage of ±10V, as specified in its Absolute Maximum Ratings table. This allows direct high-side sensing across wide common-mode voltage rails - for example, monitoring current in a 48V battery string where VS+ may sit at 48V and VS– at 47.9V, yielding a 100mV differential signal within safe operating limits.
Can the LT1787HVIMS8#PBF operate in bidirectional mode with a single 5V supply?
Yes, the LT1787HVIMS8#PBF can operate in bidirectional mode with a single 5V supply by biasing the VBIAS pin to a mid-rail voltage (e.g., 2.5V) using a precision reference like the LT6655. In this configuration, VOUT swings above and below VBIAS to indicate direction - enabling full ±128mV sense range while maintaining linearity and avoiding saturation.
What is the purpose of the DNC pin (Pin 3) on the LT1787HVIMS8#PBF?
Pin 3 of the LT1787HVIMS8#PBF is designated DNC (Do Not Connect) and is internally connected. Connecting any external trace, capacitor, or pull-up/pull-down resistor to this pin violates the Absolute Maximum Ratings and may degrade PSRR, offset voltage, or cause functional failure. The datasheet explicitly prohibits external connection to ensure guaranteed performance across temperature and supply conditions.
How does the LT1787HVIMS8#PBF achieve 12-bit dynamic range despite a 75µV input offset?
The LT1787HVIMS8#PBF achieves >12-bit dynamic range by combining a low 75µV max input offset voltage with a ±500mV full-scale input range (at VBIAS = 5V). This yields a theoretical resolution of ~122nV/LSB, enabling detection of sub-mA currents with 1mΩ shunts - verified in typical applications using the LTC1286 ADC as shown in the datasheet's front-page reference design.
Is the LT1787HVIMS8#PBF pin-compatible with the standard LT1787IMS8#PBF?
Yes, the LT1787HVIMS8#PBF is pin-compatible with the LT1787IMS8#PBF - both use identical MSOP-8 footprints and share identical pin functions, including FIL+, VS+, VBIAS, VOUT, FIL–, VS–, DNC, and VEE. The only functional difference is the extended 60V supply rating (vs. 36V) and wider temperature specification (–40°C to 125°C) of the HV variant - allowing drop-in replacement in higher-voltage designs without layout changes.
LT1787HVIMS8#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1787HVIMS8#PBF FAQ
1.How can I place an order for LT1787HVIMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787HVIMS8#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 LT1787HVIMS8#PBF reliable?
The price and inventory of LT1787HVIMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787HVIMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787HVIMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787HVIMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787HVIMS8#PBF?
LT1787HVIMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787HVIMS8#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 LT1787HVIMS8#PBF?
For technical support, including LT1787HVIMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787HVIMS8#PBF requirements.
6.How does Aetrix verify that LT1787HVIMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787HVIMS8#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 LT1787HVIMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787HVIMS8#PBF?
All LT1787HVIMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787HVIMS8#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 LT1787HVIMS8#PBF part is unused and in its original packaging.
Return procedure for LT1787HVIMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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