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Analog Devices Inc. LT1787HVHS8#PBF
- Part No.:
- LT1787HVHS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1787HVHS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:179
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Product details
Overview
LT1787HVHS8#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 8× fixed gain, ±40 µV max input offset voltage (25°C), 60 V total supply operation, 12-bit dynamic range, and operates from –40°C to 125°C. It enables accurate battery charge/discharge monitoring in portable test equipment and industrial power supplies.
For engineers reviewing the LT1787HVHS8#PBF datasheet, LT1787HVHS8#PBF pinout, LT1787HVHS8#PBF application, or LT1787HVHS8#PBF equivalent, key selection criteria include high-side sensing capability up to 60 V, ultralow offset stability over temperature, unidirectional/bidirectional output configuration flexibility, and compatibility with Kelvin-connected shunt resistors in high-current systems.
Technical Context
The LT1787HVHS8#PBF uses matched internal 1.25 kΩ gain-setting resistors and a precision current-mirror architecture to deliver fixed 8 V/V gain with >120 dB supply rejection. Its FIL+ and FIL– pins provide differential input filtering via external capacitor, enabling suppression of high-frequency noise without common-mode mismatch errors.
It supports three output configurations: split-supply bipolar swing (VBIAS = GND), single-supply shifted bias (e.g., VBIAS = 1.25 V), and unidirectional mode (VBIAS = GND, VOUT ≥ 30 mV). Output is developed across a 20 kΩ internal ROUT resistor, with VOUT referenced to VBIAS and limited to VS+ – 0.75 V maximum and ≥30 mV above VEE minimum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 60 V total (VS+ to VEE); supports high-side sensing in 48 V industrial and telecom systems. |
| Input Offset Voltage | ±40 µV (max, 25°C); enables accurate measurement of sub-10 mA currents with 100 mΩ shunt. |
| Gain Accuracy | ±3% (±100 mV input); fixed 8 V/V gain set by laser-trimmed internal resistors-no external gain components needed. |
| PSRR | ≥120 dB (2.5 V–60 V supply range); rejects supply ripple critical in noisy DC/DC converter outputs. |
| Operating Temperature | –40°C to +125°C (H-grade); qualified for under-hood automotive and industrial motor control environments. |
| Quiescent Current | 60 µA (typ); enables always-on current monitoring in battery-backed systems without significant drain. |
| Dynamic Range | 12-bit (≥4096:1); achieves full-scale resolution down to ±128 mV sense voltage with <0.1% error. |
Pinout & Package
LT1787HVHS8#PBF is housed in an 8-lead plastic SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0 mm × 6.2 mm, 1.27 mm pitch). Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ | Differential input filter terminal | Connected to midpoint of RG2A; used with FIL– to add RC low-pass filter (f–3dB = 1/(2π × 1.25 kΩ × C)) for noise rejection. |
| VS+ | Positive sense input | Connects to high-side of shunt; sourcing current through RSENSE yields VOUT > VBIAS. |
| VBIAS | Output reference bias | Sets zero-current output level; tied to external reference (e.g., LT1634-1.25) for bidirectional single-supply operation. |
| VOUT | Current/voltage output | Delivers IOUT = 8 × ISENSE × RSENSE/ROUT; voltage output = VBIAS ± 1.024 V (for ±128 mV sense). |
| FIL– | Differential input filter terminal | Connected to midpoint of RG1A; forms differential filter pair with FIL+-common-mode filtering prohibited. |
| VS– | Negative sense input | Connects to low-side of shunt; sinking current through RSENSE yields VOUT < VBIAS. |
| DNC | Do Not Connect | Internally connected; no external connection permitted-floating or grounded causes undefined behavior. |
| VEE | Negative supply / GND | Reference for internal circuitry; may be ground (single supply) or negative rail (split supply) up to –15 V. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures current flow direction and magnitude without ground-referenced shunt-enables true load-side monitoring in floating bus systems. |
| User-selectable external shunt | Supports RSENSE from 0.5 mΩ to 100 mΩ; full-scale sense voltage adjustable from ±10 mV to ±500 mV for optimal power/accuracy trade-off. |
| Integrated input filtering | FIL+/FIL– pins allow simple capacitor-based anti-aliasing at amplifier input-eliminates need for external op-amp filters in high-ripple environments. |
| Fixed-gain precision architecture | Laser-trimmed 1.25 kΩ resistors ensure stable 8× gain across temperature and supply-removes calibration burden in production test. |
| Wide temperature grade | H-grade qualification (–40°C to +125°C) ensures performance in engine control units, solar inverters, and industrial PLCs without derating. |
Applications
| Battery Charge/Discharge Monitoring | Industrial Power Supply Protection |
|---|---|
Use Scenario: Real-time tracking of bidirectional current in lithium-ion battery packs during charging and discharging cycles in portable test equipment. IC Role / Device Role / Timing Role: High-side current sense amplifier providing VOUT referenced to VBIAS, enabling ADC-compatible analog output with polarity indicating current direction. Use Value: ±40 µV offset enables detection of ≤2 mA current changes with 100 mΩ shunt-critical for state-of-charge estimation accuracy. | Use Scenario: Overcurrent detection in 48 V telecom rectifiers and programmable DC supplies where shunt must remain on high-side of output stage. IC Role / Device Role / Timing Role: Precision current monitor interfaced to comparator or microcontroller ADC, operating from 2.5 V to 60 V supply without level-shifting. Use Value: 120 dB PSRR rejects switching noise from adjacent DC/DC converters-prevents false trip events in safety-critical protection circuits. |
| Automotive Body Control Module | Portable Medical Instrumentation |
Use Scenario: Monitoring load currents in 12 V/24 V vehicle subsystems (e.g., seat motors, HVAC actuators) under under-hood temperature extremes. IC Role / Device Role / Timing Role: H-grade high-side amplifier delivering stable 8× gain and <0.5 µV/°C offset drift for reliable diagnostics across –40°C to +125°C. Use Value: 60 µA quiescent current allows continuous monitoring without draining backup battery-meets ISO 16750-2 cold-cranking requirements. | Use Scenario: Low-power current sensing in handheld ECG or infusion pump controllers requiring long battery life and precise current feedback. IC Role / Device Role / Timing Role: Micropower current sensor with Kelvin-input support, enabling accurate shunt measurements despite PCB trace resistance in compact layouts. Use Value: 12-bit dynamic range supports both microamp standby leakage checks and amp-level motor drive monitoring in same design-reduces BOM count. |
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 |
|---|---|---|---|
| INA240A1QDRQ1 | 500 kHz bandwidth vs. LT1787HV's 300 kHz; ±10 µV offset (typ) but only rated to 85°C ambient. | Automotive AEC-Q100 Grade 1; optimized for motor phase current sensing-not ideal for low-bandwidth precision DC monitoring. | Select when higher speed and automotive qualification are required; avoid if extended temperature operation (>85°C) or ultralow drift is mandatory. |
| MAX4080TASA+ | Fixed 20× gain (vs. 8×); 76 V supply rating; ±200 µV offset (max) at 125°C-higher than LT1787HV's ±400 µV (max). | Designed for high-gain, wide-VCM applications like solar MPPT; lacks FIL+/FIL– filtering pins. | Choose for higher gain and wider common-mode range; not recommended when input filtering or lowest offset at temperature is critical. |
Compared with INA240A1QDRQ1 and MAX4080TASA+, the LT1787HVHS8#PBF delivers superior offset stability over –40°C to +125°C and integrated differential input filtering-making it preferred for precision DC monitoring in harsh thermal environments where signal integrity outweighs raw bandwidth needs.
Availability
LT1787HVHS8#PBF is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, and automotive body control modules requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LT1787HVHS8#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 semiconductors, acquired Linear Technology in 2017 to strengthen its precision signal chain portfolio.
The LT1787HV product line was developed by Linear Technology specifically for high-voltage, high-accuracy bidirectional current sensing in space-constrained, thermally demanding applications-emphasizing micropower operation, Kelvin-input robustness, and integrated noise filtering.
FAQ
What is the maximum common-mode voltage the LT1787HVHS8#PBF can handle?
The LT1787HVHS8#PBF supports up to 60 V total supply voltage (VS+ to VEE), enabling operation with common-mode voltages up to 60 V above ground when VEE = GND. Its absolute maximum differential sense voltage is ±10 V, and it maintains accuracy across the full 2.5 V–60 V supply range with ≥120 dB PSRR. This makes LT1787HVHS8#PBF suitable for 48 V industrial buses and automotive 24 V systems.
Can the LT1787HVHS8#PBF be used for unidirectional current sensing only?
Yes, the LT1787HVHS8#PBF supports unidirectional operation by connecting VBIAS to GND and interpreting only positive VOUT excursions. In this mode, VOUT swings from ≥30 mV to VS+ – 0.75 V, providing a rail-to-rail compatible output for microcontrollers or comparators. The LT1787HVHS8#PBF retains its 8× gain and ultralow offset-ideal for overcurrent protection where directionality is irrelevant.
How does the FIL+ and FIL– filtering work on the LT1787HVHS8#PBF?
The FIL+ and FIL– pins connect internally to the midpoints of the 1.25 kΩ gain-setting resistors RG1A and RG2A. Placing a capacitor between them creates a differential-mode low-pass filter with f–3dB = 1/(2π × 1.25 kΩ × C). For example, a 0.01 µF capacitor sets a 12.7 kHz corner-effective against switch-node noise while avoiding common-mode errors. This feature is unique to LT1787HVHS8#PBF among precision high-side amplifiers.
What is the purpose of the DNC pin on the LT1787HVHS8#PBF?
Pin 3 (DNC) on the LT1787HVHS8#PBF is "Do Not Connect"-it is internally bonded and electrically active but not intended for external use. Connecting any trace, capacitor, or pull-up/pull-down resistor to this pin may disrupt internal biasing or cause unpredictable gain/offset behavior. The LT1787HVHS8#PBF datasheet explicitly prohibits external connection, and proper layout requires leaving this pad floating and unmasked in solder paste.
Does the LT1787HVHS8#PBF require external gain-setting resistors?
No, the LT1787HVHS8#PBF uses laser-trimmed internal 1.25 kΩ resistors to set its fixed 8 V/V gain-no external resistors are needed. This eliminates gain error sources from component tolerance, temperature drift, and layout parasitics. The gain remains stable across supply (2.5 V–60 V) and temperature (–40°C to +125°C), making LT1787HVHS8#PBF ideal for calibration-free designs where consistent scaling is essential.
LT1787HVHS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 60 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1787HVHS8#PBF FAQ
1.How can I place an order for LT1787HVHS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787HVHS8#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 LT1787HVHS8#PBF reliable?
The price and inventory of LT1787HVHS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787HVHS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787HVHS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787HVHS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787HVHS8#PBF?
LT1787HVHS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787HVHS8#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 LT1787HVHS8#PBF?
For technical support, including LT1787HVHS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787HVHS8#PBF requirements.
6.How does Aetrix verify that LT1787HVHS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787HVHS8#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 LT1787HVHS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787HVHS8#PBF?
All LT1787HVHS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787HVHS8#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 LT1787HVHS8#PBF part is unused and in its original packaging.
Return procedure for LT1787HVHS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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