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Analog Devices Inc. LT1787HVIS8#TRPBF
- Part No.:
- LT1787HVIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1787HVIS8#TRPBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,470
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Product details
Overview
LT1787HVIS8#TRPBF from Analog Devices (acquired Linear Technology) is a precision high-side current sense amplifier designed for bidirectional sensing in industrial and automotive power systems. It features 75 µV max input offset voltage, 8 V/V fixed gain, 2.5 V to 60 V total supply operation, 60 µA quiescent current, and operates across –40°C to 125°C. It enables accurate battery monitoring and load current protection in high-voltage DC systems.
For engineers reviewing the LT1787HVIS8#TRPBF datasheet, LT1787HVIS8#TRPBF pinout, LT1787HVIS8#TRPBF application, or LT1787HVIS8#TRPBF equivalent, key selection criteria include high-side bidirectional sensing capability, ±10 V differential input range, 12-bit dynamic resolution, PSRR >120 dB, and compatibility with Kelvin-connected shunt resistors in 8-lead SOIC packages.
Technical Context
The LT1787HVIS8#TRPBF uses matched internal 1.25 kΩ gain-setting resistors and a transconductance architecture to deliver precise 8× amplification of the sense voltage (VS+ – VS–), with output referenced to VBIAS. Its dual-supply or single-supply configurable interface supports both unidirectional and bidirectional current measurement via voltage or current output modes.
Input filtering is implemented externally between FIL+ and FIL– pins using a capacitor to set a low-pass corner at f–3dB = 1/(2π × 1.25 kΩ × C), enabling rejection of high-frequency noise above 300 kHz. The device maintains accuracy under high common-mode voltages up to 60 V while rejecting supply ripple with >120 dB PSRR across its full operating voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 60 V total supply - supports wide-input industrial and automotive battery systems without external regulators. |
| Input Offset Voltage (max) | 75 µV at TA = 25°C - enables accurate low-current sensing down to ~2 mA with 0.0016 Ω shunt. |
| Fixed Gain | 8 V/V ±3% - eliminates external gain-setting components and ensures stable transfer function across temperature. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
| Quiescent Current | 60 µA - allows continuous monitoring in battery-powered portable test equipment. |
| PSRR | >120 dB - rejects supply noise in noisy switching power rails, preserving measurement integrity. |
| Differential Input Range | ±10 V - accommodates high common-mode voltages while resolving small sense signals. |
Pinout & Package
LT1787HVIS8#TRPBF is packaged in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ | Positive input filter terminal | Connected internally to midpoint of RG2A; used with FIL– to add RC low-pass filter for high-frequency noise rejection. |
| VS– | Negative sense input | Connects to low-side of shunt resistor; sinks current proportional to negative sense voltage (VS+ < VS–). |
| DNC | Do Not Connect | Internally connected; no external connection permitted to avoid performance degradation. |
| VEE | Negative supply / ground reference | Serves as return path for internal bias currents; tied to system ground in single-supply configurations. |
| VOUT | Amplified output terminal | Delivers voltage output VOUT = VBIAS + 8 × (VS+ – VS–); swing limited to 30 mV above VEE and 0.75 V below VS+. |
| VBIAS | Output bias reference | Sets zero-current output level; grounded for split-supply bidirectional mode, or biased externally (e.g., 1.25 V) for single-supply bidirectional operation. |
| VS+ | Positive sense input | Connects to high-side of shunt resistor; sources current proportional to positive sense voltage (VS+ > VS–). |
| FIL– | Negative input filter terminal | Connected internally to midpoint of RG1A; used with FIL+ to implement differential input filtering. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Enables real-time charge/discharge monitoring in battery management systems without ground-referenced shunt placement. |
| User-selectable external sense resistor | Supports flexible design trade-offs between power loss (I²R) and resolution-e.g., 0.0016 Ω for 100 A full-scale with 100 mV input. |
| Integrated input filtering terminals (FIL+/FIL–) | Allows simple addition of differential RC filter to suppress EMI/switching noise without modifying core amplifier topology. |
| 12-bit dynamic range | Provides >4096:1 measurable current ratio-critical for detecting fault conditions (e.g., 10 mA leakage vs. 100 A load) in same system. |
| Unidirectional or bidirectional output configuration | Configurable via VBIAS connection: grounded for bipolar swing, or externally biased for single-supply rail-to-rail compatible output. |
Applications
| Battery Monitoring | Power Monitoring |
|---|---|
Use Scenario: Real-time monitoring of charge/discharge current in 48 V lithium-ion battery packs for EV auxiliary systems. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, Kelvin-connected analog output proportional to bidirectional pack current. Use Value: Enables SOC estimation and overcurrent protection with 75 µV offset error limiting minimum detectable current to ~2 mA using 0.0016 Ω shunt. | Use Scenario: Accurate input current measurement in telecom rectifier modules operating from –48 V DC bus. IC Role / Device Role / Timing Role: Precision high-side current sensor interfacing to ADC for digital power management and fault logging. Use Value: Delivers 12-bit dynamic range and >120 dB PSRR to maintain accuracy despite high ripple on –48 V rail. |
| Portable Test/Measurement Systems | Battery-Operated Systems |
Use Scenario: Handheld current tracer tool measuring microamp-to-amp loads in field service diagnostics. IC Role / Device Role / Timing Role: Micropower current sense front-end with 60 µA supply current and Kelvin-shunt interface. Use Value: Extends battery life while supporting wide dynamic range via programmable shunt selection and VBIAS configuration. | Use Scenario: Load current supervision in medical IoT devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent current high-side monitor enabling continuous current logging without compromising standby time. Use Value: Achieves sub-mA resolution with 75 µV offset and operates down to 2.5 V supply-compatible with aging primary cells. |
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 | 5 V supply only; 20 V/V gain; 50 µV max offset; AEC-Q100 qualified | Automotive-grade variant with stricter qualification but narrower supply range | Preferred for automotive ECUs requiring AEC-Q100; not suitable for 60 V industrial rails. |
| MAX40056ASA+T | 2.7 V to 65 V supply; 20 V/V gain; 100 µV max offset; integrated 200 mΩ shunt option | Higher gain and integrated shunt simplify layout but reduce flexibility in shunt selection | Best for space-constrained designs needing fast time-to-market; less optimal for ultra-low-offset requirements. |
Compared with INA240A1QDRQ1 and MAX40056ASA+T, LT1787HVIS8#TRPBF offers superior offset performance (75 µV vs. 100 µV/50 µV) and widest supply range (2.5–60 V), making it ideal for high-accuracy, wide-input industrial current monitoring where external shunt optimization is critical.
Availability
LT1787HVIS8#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, power monitoring, and portable test/measurement systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1787HVIS8#TRPBF 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.
The LT1787 family was developed by Linear Technology specifically for precision high-side current sensing in harsh environments, emphasizing low offset, wide supply range, and Kelvin-compatible layout for industrial and automotive power systems.
FAQ
What is the maximum common-mode voltage supported by the LT1787HVIS8#TRPBF?
The LT1787HVIS8#TRPBF supports a total supply voltage of up to 60 V, enabling operation with common-mode voltages up to 60 V referenced to VEE. Its differential input rating is ±10 V, meaning it can accurately resolve sense voltages across shunts placed at high-side potentials up to 60 V while maintaining 75 µV offset performance. This makes LT1787HVIS8#TRPBF suitable for 48 V battery systems and industrial DC rails.
Can the LT1787HVIS8#TRPBF be used in single-supply configurations?
Yes, the LT1787HVIS8#TRPBF supports single-supply operation by connecting VEE to ground and biasing VBIAS to a mid-rail voltage (e.g., 1.25 V via LT1634). In this mode, VOUT swings symmetrically around VBIAS to indicate bidirectional current flow. The LT1787HVIS8#TRPBF's 2.5 V minimum supply allows use with low-voltage microcontrollers and ADCs, and its 60 µA quiescent current preserves battery life in portable implementations.
How does the LT1787HVIS8#TRPBF achieve 12-bit dynamic range despite its 75 µV input offset?
The LT1787HVIS8#TRPBF achieves 12-bit dynamic range through ultralow 75 µV max input offset voltage combined with a full-scale sense voltage of ±500 mV and fixed 8× gain. With 75 µV offset limiting resolution to ~9.4 µV per LSB at 500 mV full-scale (500 mV / 4096 ≈ 122 µV), the effective usable range exceeds 12 bits when paired with appropriate external filtering and high-resolution ADCs like the LTC1286. The LT1787HVIS8#TRPBF's design ensures this performance holds across –40°C to 125°C.
What is the purpose of the FIL+ and FIL– pins on the LT1787HVIS8#TRPBF?
The FIL+ and FIL– pins on the LT1787HVIS8#TRPBF provide access to internal resistor midpoints (RG1A/RG2A) for adding external differential RC filtering. Connecting a capacitor between them forms a single-pole low-pass filter with f–3dB = 1/(2π × 1.25 kΩ × C), suppressing high-frequency noise before amplification. This prevents aliasing in downstream ADCs and improves immunity to switching noise-critical in motor drives and SMPS applications where the LT1787HVIS8#TRPBF is commonly deployed.
Is the LT1787HVIS8#TRPBF pin-compatible with other members of the LT1787 family?
Yes, the LT1787HVIS8#TRPBF shares identical 8-lead SOIC (S8) pinout and functionality with all LT1787/LT1787HV variants including LT1787CS8, LT1787HS8, and LT1787HVCS8. Differences lie solely in temperature grade (H = –40°C to 125°C) and supply rating (HV = 60 V max), not pin assignment or electrical interface. This allows direct substitution in existing layouts when upgrading to higher temperature or voltage capability, provided system-level validation confirms thermal and supply margin compliance for LT1787HVIS8#TRPBF.
LT1787HVIS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1787HVIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787HVIS8#TRPBF 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#TRPBF reliable?
The price and inventory of LT1787HVIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787HVIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1787HVIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787HVIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787HVIS8#TRPBF?
LT1787HVIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787HVIS8#TRPBF 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#TRPBF?
For technical support, including LT1787HVIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787HVIS8#TRPBF requirements.
6.How does Aetrix verify that LT1787HVIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1787HVIS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1787HVIS8#TRPBF?
All LT1787HVIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787HVIS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1787HVIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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