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Analog Devices Inc. LT1787HVIS8#PBF
- Part No.:
- LT1787HVIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1787HVIS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:156
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Product details
Overview
LT1787HVIS8#PBF from Analog Devices (formerly Linear Technology) is a precision high-side current sense amplifier designed for bidirectional sensing in industrial and battery-powered systems. It features 8× fixed gain, ±40 µV max input offset voltage (25°C), 12-bit dynamic range, 60 µA supply current, and operates from 2.5V to 60V total supply voltage across –40°C to 125°C. It enables accurate monitoring of load currents up to ±128 mV sense voltage in portable test equipment and battery-operated power supplies.
For engineers reviewing the LT1787HVIS8#PBF datasheet, LT1787HVIS8#PBF pinout, LT1787HVIS8#PBF application, or LT1787HVIS8#PBF equivalent, this page delivers verified specifications, package mapping to 8-lead SO, functional pin definitions, real-world use cases in bidirectional battery monitoring, and two validated alternative parts with documented technical differences.
Technical Context
The LT1787HVIS8#PBF implements a matched resistor-based current mirror architecture with internal RG1A/RG2A (1.25 kΩ) and ROUT (20 kΩ) to achieve precise 8× gain. Its differential FIL+/FIL– pins support external RC filtering (f–3dB = 1/(2π·1.25kΩ·C)) for high-frequency noise rejection up to 300 kHz bandwidth.
It supports three output configurations: split-supply bipolar swing (VBIAS = GND), single-supply unidirectional (VBIAS = GND), and single-supply bidirectional (VBIAS externally biased). Output voltage range is constrained by VEE (min 30 mV above VEE) and VS+ (max VS+ – 0.75 V), with guaranteed operation up to 35 V output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 60 V total (VS– to VEE); supports wide-input industrial and automotive battery rails |
| Input Offset Voltage (Max) | ±100 µV over –40°C to 85°C; ensures ≤2 mA error at 100 mV full-scale with 20 mΩ RSENSE |
| Fixed Gain | 8 V/V (±3% gain error); eliminates external gain-setting components and calibration drift |
| Dynamic Range | ≥12-bit (≥4096:1); enables detection of sub-mA currents in high-current systems (e.g., 100 A with 20 mΩ) |
| Quiescent Current | 60 µA typical; extends battery life in portable instrumentation and low-power IoT sensors |
| Operating Temperature | –40°C to 125°C (H-grade); qualified for under-hood automotive and industrial motor control environments |
| PSRR | ≥120 dB (VS supply); rejects ripple on high-voltage bus lines without additional regulation |
Pinout & Package
LT1787HVIS8#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+ | Positive input filter terminal | Internally connected to midpoint of RG2A; used with FIL– to add RC low-pass filter (f–3dB = 1/(2π·1.25kΩ·C)) |
| VS+ | Positive sense input | Connects to high-side of RSENSE; sourcing current flows into VS+ when ILOAD > 0 |
| VBIAS | Output bias reference | Sets zero-current output level; tied to GND for unidirectional mode, to external ref (e.g., 1.25 V) for bidirectional |
| VOUT | Voltage/current output | Delivers VOUT = 8·VSENSE + VOUT(O) + VBIAS; drives ADC inputs or op-amp buffers directly |
| FIL– | Negative input filter terminal | Internally connected to midpoint of RG1A; forms differential filter pair with FIL+ |
| VS– | Negative sense input | Connects to low-side of RSENSE; sinking current flows out of VS– when ILOAD < 0 |
| DNC | Do Not Connect | Internally connected; must remain floating-no external connection permitted |
| VEE | Negative supply / GND | Reference for internal circuitry; tied to GND in single-supply mode; may be negative in split-supply configs |
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 RSENSE | Supports full-scale sense voltages from ±10 mV to ±500 mV-optimizes tradeoff between power loss and resolution |
| Integrated input filtering (FIL+/FIL–) | Eliminates need for external op-amp filters; reduces board space and EMI susceptibility in noisy motor drive environments |
| 12-bit dynamic range with 40 µV offset | Resolves 1 LSB = 12.2 µV at 50 mV full-scale-enables accurate low-current detection in energy metering |
| –40°C to 125°C H-grade qualification | Guaranteed performance in engine control units, solar inverters, and industrial PLC modules without derating |
Applications
| Battery Charge/Discharge Monitoring | Industrial Power Supply Monitoring |
|---|---|
Use Scenario: Real-time tracking of bidirectional current in Li-ion battery packs during charging and discharging cycles in portable medical devices. IC Role / Device Role / Timing Role: High-side current sense amplifier providing VOUT referenced to VBIAS to interface with 12-bit SAR ADC (e.g., LTC1286). Use Value: Enables ±128 mV sense voltage detection with <2 mA resolution using 20 mΩ RSENSE-critical for state-of-charge accuracy. | Use Scenario: Continuous monitoring of output current in 48 V telecom rectifiers to detect overload or short-circuit conditions. IC Role / Device Role / Timing Role: Precision current sensor placed on high-side of DC-DC converter output stage, rejecting common-mode noise up to 60 V. Use Value: 120 dB PSRR suppresses switching ripple from 500 kHz converters, eliminating false trip events in protection logic. |
| Portable Test Equipment | Automotive Body Control Module |
Use Scenario: Current measurement in handheld multimeters and clamp meters where ultra-low quiescent current extends battery life. IC Role / Device Role / Timing Role: Micropower (60 µA) current amplifier feeding isolated sigma-delta ADC in battery-powered DMM front-end. Use Value: 60 µA supply current allows >1000 hours of operation on two AA cells-meeting IEC 61010 portability requirements. | Use Scenario: Load current supervision for LED headlight drivers and window motor controllers in under-hood ECUs. IC Role / Device Role / Timing Role: High-temperature-stable current monitor interfacing with microcontroller ADC via buffered VOUT output. Use Value: Guaranteed operation at 125°C ambient enables direct placement near power MOSFETs-reducing trace inductance and improving fault response time. |
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 |
|---|---|---|---|
| INA240A1DR | 20 V/V fixed gain; 50 µV max offset (–40°C to 125°C); 2.7 V to 80 V supply; integrated EMI filter | Higher gain simplifies small-signal detection but requires lower RSENSE values; wider supply supports 48 V+ systems | Preferred when higher gain and superior EMI immunity are needed, especially in automotive CAN bus environments |
| MAX4080TASA+ | 100 V/V gain; 100 µV max offset (–40°C to 125°C); 4.5 V to 76 V supply; unidirectional only | Lacks bidirectional capability; optimized for high-side overcurrent protection rather than precision measurement | Select when unidirectional fault detection dominates design-e.g., fuseless short-circuit protection in server PSUs |
Compared with LT1787HVIS8#PBF, INA240A1DR offers better EMI robustness and wider supply range but requires PCB layout changes due to different pinout and gain scaling; MAX4080TASA+ provides higher sensitivity for protection thresholds but cannot replace bidirectional monitoring functions without system-level redesign.
Availability
LT1787HVIS8#PBF is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1787HVIS8#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, micropower, high-voltage high-side current sensing-targeting applications where ground-referenced shunts are impractical and thermal stability is critical.
FAQ
What is the maximum sense voltage range supported by the LT1787HVIS8#PBF?
The LT1787HVIS8#PBF supports a differential input sense voltage (VS+ – VS–) of ±128 mV for full-scale linear operation, with absolute maximum ratings of ±10 V. At 25°C, its 40 µV typical input offset voltage enables accurate measurement down to ±10 µV sense signals-corresponding to ~0.5 mA with a 20 mΩ shunt resistor. The device maintains linearity across its specified operating temperature range of –40°C to 125°C.
How does the LT1787HVIS8#PBF achieve bidirectional current sensing?
The LT1787HVIS8#PBF achieves bidirectional sensing by producing an output voltage VOUT = 8·VSENSE + VOUT(O) + VBIAS, where VSENSE = VS+ – VS–. When VSENSE > 0 (current flowing from VS+ to VS–), VOUT rises above VBIAS; when VSENSE < 0, VOUT falls below VBIAS. This requires VBIAS to be externally biased (e.g., to 1.25 V) in single-supply systems. The internal current mirror architecture ensures symmetric positive/negative gain and matched offset behavior across temperature.
Can the LT1787HVIS8#PBF be used with a single 3.3 V supply?
Yes, the LT1787HVIS8#PBF operates from a minimum total supply voltage of 2.5 V, making it compatible with 3.3 V single-supply systems. In this configuration, VEE is tied to GND, VBIAS is set to a mid-rail voltage (e.g., 1.25 V via LT1634), and VOUT swings ±1.024 V around VBIAS. The output can reach as low as 30 mV above VEE and as high as VS+ – 0.75 V-ensuring usable headroom even at 3.3 V. Verified operation is documented in Figure 4 of the datasheet.
What is the purpose of the FIL+ and FIL– pins on the LT1787HVIS8#PBF?
The FIL+ and FIL– pins on the LT1787HVIS8#PBF provide access to internal resistor midpoints (RG1A and RG2A) to implement a differential RC low-pass filter. Connecting a capacitor between FIL+ and FIL– creates a single-pole filter with f–3dB = 1/(2π·1.25 kΩ·C). A 0.01 µF capacitor yields ~12.7 kHz cutoff-ideal for attenuating PWM switching noise from motor drives or DC-DC converters while preserving signal integrity for current measurement.
Is the LT1787HVIS8#PBF pin-compatible with other variants in the LT1787 family?
Yes, the LT1787HVIS8#PBF shares identical 8-lead SO packaging and pinout with all LT1787/LT1787HV variants (e.g., LT1787CS8, LT1787HVCS8), including LT1787HVIS8#PBF's H-grade temperature rating (–40°C to 125°C) and HV voltage range (2.5 V to 60 V). This allows drop-in replacement in existing designs when upgrading to higher temperature or voltage capability-no PCB changes required.
LT1787HVIS8#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:
- 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-SO
LT1787HVIS8#PBF FAQ
1.How can I place an order for LT1787HVIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787HVIS8#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 LT1787HVIS8#PBF reliable?
The price and inventory of LT1787HVIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787HVIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787HVIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787HVIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787HVIS8#PBF?
LT1787HVIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787HVIS8#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 LT1787HVIS8#PBF?
For technical support, including LT1787HVIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787HVIS8#PBF requirements.
6.How does Aetrix verify that LT1787HVIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787HVIS8#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 LT1787HVIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787HVIS8#PBF?
All LT1787HVIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787HVIS8#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 LT1787HVIS8#PBF part is unused and in its original packaging.
Return procedure for LT1787HVIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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