My Inquiry
My Account
Analog Devices Inc. LT1999HMS8-10#PBF
- Part No.:
- LT1999HMS8-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999HMS8-10#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:884
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1999HMS8-10#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 10V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and ±0.5% gain accuracy. It operates from a 4.5V–5.5V supply, draws 1.55mA, and supports high-side or low-side shunt monitoring in H-bridge motor controls and battery charge/discharge systems.
For engineers reviewing the LT1999HMS8-10#PBF datasheet, LT1999HMS8-10#PBF pinout, LT1999HMS8-10#PBF application, or LT1999HMS8-10#PBF equivalent, this page delivers verified specifications, FMEA-optimized MSOP-8 pinout, automotive-grade (–40°C to 125°C) thermal performance, and real-world design context for precision current sensing in high-CMRR, high-bandwidth power systems.
Technical Context
The LT1999HMS8-10#PBF uses matched internal 4kΩ input resistors and a transconductance stage to convert differential shunt voltage into a proportional output current, which is then converted to voltage via an on-chip 40kΩ feedback resistor (RG), yielding precise 10V/V gain. Its architecture enables smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity.
It features dual-mode REF pin control-default mid-supply bias via internal 160kΩ divider or external reference override-and integrated shutdown logic with <10µA quiescent current. Input ESD clamps protect pins +IN/–IN against asymmetric CM excursions up to –5.25V and 88V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V ±0.5% - ensures accurate current magnitude resolution within 5mV error at 500mV full-scale sense voltage. |
| Common Mode Range | –5V to 80V - supports direct sensing in 48V industrial buses, 60V EV subsystems, and negative-rail solenoid drivers. |
| Bandwidth | 2MHz - enables faithful capture of fast PWM edge transitions and transient overcurrent events in switching power supplies. |
| Input Offset Voltage | ±1.5mV max - limits current measurement error to ≤150µA when using 10mΩ shunt at 10V/V gain. |
| Supply Current | 1.55mA typical - allows integration into always-on battery monitoring circuits with minimal standby drain. |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive and industrial motor drive environments per AEC-Q100. |
| CMRR @ 100kHz | >80dB - rejects high-frequency noise from adjacent power switches during PWM commutation. |
Pinout & Package
LT1999HMS8-10#PBF is housed in an 8-lead plastic MSOP package (MS8) with FMEA-optimized pinout engineered for fault tolerance. Package dimensions: 3.0mm × 3.0mm × 0.85mm, exposed pad optional, θJA = 300°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive Sense Input | Connects to high-side of shunt resistor; accepts common mode voltages up to 80V or down to –5V. |
| –IN (Pin 2) | Negative Sense Input | Connects to low-side of shunt; matched impedance with +IN ensures stable CMRR across temperature. |
| NC (Pin 3) | No Connect | Internally unconnected; must remain floating-no routing or grounding permitted. |
| V+ (Pin 4) | Power Supply | 4.5V–5.5V analog supply; pins 1 and 4 are internally tied-both require local 0.1µF decoupling. |
| GND (Pin 5) | Analog Ground | Reference for internal bias network and REF divider; separate from power ground for noise isolation. |
| REF (Pin 6) | Output Reference | Sets output common-mode level; default 2.5V (mid-supply); externally programmable from 1.25V to V+–1.25V. |
| OUT (Pin 7) | Amplified Output | Low-impedance voltage output (0.15Ω); drives ≥200pF directly; requires series R ≥100Ω for larger capacitive loads. |
| SHDN (Pin 8) | Shutdown Control | Active-low enable; <0.5V = shutdown (<10µA IQ); floating or >V+–0.5V = active; internal 2µA pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Sensing | Outputs polarity-reversed voltage relative to REF to distinguish charging vs. discharging current flow in battery systems. |
| FMEA-Optimized Pinout | NC on Pin 3 eliminates risk of accidental shorting between +IN/–IN during PCB layout or rework-critical for functional safety designs. |
| High CM Immunity | 96dB DC CMRR and >80dB AC CMRR at 100kHz suppress noise from adjacent high-dV/dt power nodes in motor drives. |
| Robust Input Protection | ESD clamps allow safe operation with –5.25V to 88V common mode-covers surge transients beyond ABS max ratings. |
| Automotive Qualification | AEC-Q100 Grade H (–40°C to 125°C) with demonstrated 1000+ hours life at 150°C junction temperature. |
Applications
| H-Bridge Motor Control | Solenoid Current Sense |
|---|---|
Use Scenario: Monitoring bidirectional armature current in 48V BLDC motor controllers with PWM switching at 20kHz. IC Role / Device Role / Timing Role: High-side current sense amplifier providing real-time magnitude/polarity feedback to PWM gate driver IC for torque regulation and overcurrent protection. Use Value: 2MHz bandwidth captures fast current slew rates; ±0.5% gain accuracy enables precise field-oriented control (FOC) without calibration drift over temperature. | Use Scenario: Detecting energization/de-energization timing and coil health in automotive transmission solenoids operating from –3V to 36V battery rails. IC Role / Device Role / Timing Role: Low-side shunt monitor interfacing with microcontroller ADC to validate solenoid activation sequence and detect open/short faults. Use Value: –5V to 80V common mode range accommodates negative back-EMF spikes; 1.5mV offset ensures <1mA false-trip threshold with 100mΩ shunt. |
| High Voltage Data Acquisition | PWM Control Loops |
Use Scenario: Isolated current measurement in 60V telecom rectifier modules where galvanic isolation is cost-prohibitive. IC Role / Device Role / Timing Role: Precision front-end amplifier feeding isolated sigma-delta ADC, replacing optocoupled solutions with higher bandwidth and linearity. Use Value: 96dB CMRR rejects common-mode noise from high-frequency switching; 10V/V gain scales 50mV shunt drop to 0.5V full-scale ADC input. | Use Scenario: Real-time current feedback in synchronous buck converter controlling 12V→1V core voltage for AI accelerators. IC Role / Device Role / Timing Role: Fast-response current sensor in inner-loop control path, enabling adaptive duty-cycle adjustment within 2.5µs settling time. Use Value: 2.5µs 0.5% settling time and 2MHz bandwidth support >500kHz switching frequencies while maintaining loop stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain, 80V CM range, 4.5V–5.5V supply, but only 400kHz bandwidth and no FMEA pinout. | Lower bandwidth limits use in >200kHz PWM systems; lacks NC pin for fault-tolerant layout. | Select when gain flexibility (20V/V) and AEC-Q100 qualification are prioritized over speed and FMEA robustness. |
| MAX40056ATA+T | 10V/V gain, 65V CM range, 2.5MHz bandwidth, but rated only to 105°C and no automotive qualification. | Insufficient for under-hood automotive use; narrower CM range excludes –5V rail applications like solenoid drivers. | Select for industrial 0°C–105°C applications requiring highest bandwidth and lowest noise (12nV/√Hz), not automotive or extended CM. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999HMS8-10#PBF uniquely combines AEC-Q100 H-grade temperature range, FMEA-optimized MSOP pinout, and guaranteed 2MHz bandwidth with –5V to 80V common mode-making it the only option for safety-critical, high-speed, wide-CM automotive current sensing.
Availability
LT1999HMS8-10#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, and automotive solenoid monitoring requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LT1999HMS8-10#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1999 family was designed specifically for high-accuracy, high-bandwidth bidirectional current sensing in harsh electrical environments-including automotive powertrain, industrial motor drives, and high-voltage data acquisition-where wide common mode range and fault-tolerant layout are mandatory.
FAQ
What is the maximum common mode voltage the LT1999HMS8-10#PBF can handle?
The LT1999HMS8-10#PBF supports a continuous input common mode voltage range of –5V to 80V. Its ESD clamps allow safe operation up to –5.25V and 88V for transient conditions, as confirmed in Absolute Maximum Ratings and Note 2 of the datasheet. This makes LT1999HMS8-10#PBF suitable for 48V automotive systems and industrial 60V bus monitoring.
Does the LT1999HMS8-10#PBF require external resistors for gain setting?
No, the LT1999HMS8-10#PBF has a fixed 10V/V gain implemented with laser-trimmed on-chip resistors (RG = 40kΩ, RIN = 4kΩ). No external gain-setting components are needed-unlike programmable amplifiers, LT1999HMS8-10#PBF delivers guaranteed ±0.5% gain accuracy without calibration or external parts.
Can the LT1999HMS8-10#PBF be used for both high-side and low-side current sensing?
Yes, the LT1999HMS8-10#PBF supports both configurations. Its –5V to 80V common mode range allows connection to either side of the shunt: high-side (e.g., between 48V rail and load) or low-side (between load and GND), including negative-rail solenoids. The output polarity relative to REF indicates current direction in either topology.
What is the purpose of the NC pin on the LT1999HMS8-10#PBF?
The NC pin (Pin 3) on the LT1999HMS8-10#PBF is intentionally unconnected and part of the FMEA-optimized MSOP pinout. It prevents accidental shorting between +IN and –IN during PCB assembly or rework-reducing risk of catastrophic failure in safety-critical applications. Per datasheet Pin Functions, this pin must remain unconnected and un-routed.
How does the REF pin function in the LT1999HMS8-10#PBF?
The REF pin (Pin 6) sets the output common-mode voltage level. By default, it's biased to mid-supply (2.5V at 5V V+) via internal 160kΩ resistors. It can be overdriven by an external source within 1.25V to V+–1.25V to shift the output baseline-enabling single-supply interfacing with ADCs or level-shifting for bipolar output swing. LT1999HMS8-10#PBF maintains ±3mV offset stability across this range.
LT1999HMS8-10#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:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 137.5 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.8mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1999HMS8-10#PBF FAQ
1.How can I place an order for LT1999HMS8-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HMS8-10#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 LT1999HMS8-10#PBF reliable?
The price and inventory of LT1999HMS8-10#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HMS8-10#PBF is usually 5 days.
3.What payment methods are accepted for LT1999HMS8-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HMS8-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HMS8-10#PBF?
LT1999HMS8-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HMS8-10#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 LT1999HMS8-10#PBF?
For technical support, including LT1999HMS8-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HMS8-10#PBF requirements.
6.How does Aetrix verify that LT1999HMS8-10#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999HMS8-10#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 LT1999HMS8-10#PBF meets industry standards.
7.What is the process for return or replacement of LT1999HMS8-10#PBF?
All LT1999HMS8-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HMS8-10#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 LT1999HMS8-10#PBF part is unused and in its original packaging.
Return procedure for LT1999HMS8-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1999HMS8-10#PBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
