My Inquiry
My Account
Analog Devices Inc. LT1999HMS8-50F#PBF
- Part No.:
- LT1999HMS8-50F#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1999HMS8-50F#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,046
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1999HMS8-50F#PBF from Analog Devices is a high-voltage, bidirectional current sense amplifier with 50V/V fixed gain, –5V to 80V input common mode range, 2.5mV max input offset voltage, and 1.2MHz small-signal bandwidth. It operates from a 4.5V–5.5V supply, draws 1.55mA quiescent current, and supports automotive-grade operation from –40°C to 125°C in an 8-lead MSOP package engineered for FMEA.
For engineers reviewing the LT1999HMS8-50F#PBF datasheet, LT1999HMS8-50F#PBF pinout, LT1999HMS8-50F#PBF application, or LT1999HMS8-50F#PBF equivalent, this device delivers precision bidirectional sensing in high-side H-bridge motor control, battery charge/discharge monitoring, and high-voltage PWM power stage feedback where robust common-mode rejection (>96dB) and fast recovery (<1.3µs) from ±50V CM transients are required.
Technical Context
The LT1999HMS8-50F#PBF uses a matched resistor-based transconductance architecture with internal 4kΩ differential input resistors and a 200kΩ gain-setting resistor (RG), yielding precise 50V/V gain. Its REF pin sets output common-mode level-either via internal mid-supply divider or external voltage-and enables bipolar output swing relative to that reference.
It features dual-input ESD clamps enabling safe operation across –5.25V to 88V common-mode voltages, and its shutdown pin (SHDN) reduces supply current to <10µA. The FMEA-optimized pinout relocates NC to Pin 3 to prevent misconnection-induced failure modes in safety-critical automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed-enables direct conversion of ±0.08V shunt voltage to ±4V output for ADC interfacing with 12-bit resolution. |
| Input Common Mode Range | –5V to 80V-supports high-side sensing in 48V/60V industrial and automotive battery systems without level-shifting. |
| Input Offset Voltage | ±2.5mV max over temperature-limits current measurement error to ≤±50µA when using 50mΩ shunt. |
| Small-Signal Bandwidth | 1.2MHz-captures fast current transients in switching power supplies and PWM-driven solenoids. |
| CMRR | ≥96dB at DC, ≥75dB at 100kHz-rejects noise from noisy high-voltage rails during motor commutation. |
| Shutdown Current | <10µA-enables low-power sleep mode in battery-powered telemetry and energy metering. |
| Operating Temperature | –40°C to 125°C-qualified per AEC-Q100 Grade H for under-hood automotive applications. |
Pinout & Package
Package: 8-lead plastic MSOP (3mm × 3mm), FMEA-optimized pinout (Pin 3 = NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Positive sense input | Connects to high-side of shunt resistor; matched with –IN for differential sensing. |
| –IN (Pin 2) | Negative sense input | Connects to low-side of shunt; differential pair rejects common-mode noise. |
| NC (Pin 3) | No connect | FMEA-designated open pin prevents incorrect routing or solder bridging in safety-critical layouts. |
| V+ (Pin 4) | Power supply | 4.5V–5.5V analog supply; Pins 1 & 4 internally tied in original pinout but isolated in FMEA variant. |
| GND (Pin 5) | Ground reference | Return path for supply and REF divider; must be low-impedance for stable CMRR. |
| REF (Pin 6) | Output common-mode reference | Sets VOUT midpoint; default = V+/2; externally overdrivable from 1.125V to V+–1.125V. |
| OUT (Pin 7) | Analog output | Low-impedance rail-to-rail capable output; drives ≤200pF directly; requires series R for larger loads. |
| SHDN (Pin 8) | Shutdown control | Active-low: ≤0.5V = shutdown (<10µA); floating or ≥V+–0.5V = active (1.55mA). |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-optimized MSOP pinout | Pin 3 designated NC to eliminate risk of shorting +IN/–IN during assembly or rework in ASIL-B/C systems. |
| High common-mode transient immunity | 1.3µs recovery from ±50V CM step ensures accurate current capture during MOSFET switching edges. |
| Bidirectional sensing with polarity indication | VOUT > VREF = positive current flow; VOUT < VREF = negative current flow-no external inversion needed. |
| AEC-Q100 qualified Grade H | Validated for automotive under-hood use with guaranteed performance from –40°C to 125°C junction. |
| ESD-hardened inputs | 4kV HBM / 1kV CDM tolerance on +IN/–IN pins enables robustness in manufacturing and field environments. |
Applications
| H-Bridge Motor Control | Battery Charge/Discharge Monitoring |
|---|---|
Use Scenario: Real-time phase current measurement in 48V electric power steering (EPS) motor drivers. IC Role / Device Role / Timing Role: High-side bidirectional current sensor feeding closed-loop torque control and overcurrent protection logic. Use Value: 50V/V gain and 1.2MHz bandwidth resolve PWM ripple and commutation spikes; FMEA pinout reduces functional safety validation effort. | Use Scenario: Bidirectional current tracking in lithium-ion battery packs for EVs and energy storage systems. IC Role / Device Role / Timing Role: Precision shunt-based coulomb counting and state-of-charge estimation with direction-aware output. Use Value: ±5V to 80V CM range covers full pack voltage swing; <2.5mV offset ensures ≤0.5% current error at 10A with 50mΩ shunt. |
| Industrial Solenoid Driver Feedback | High-Voltage Data Acquisition Front-End |
Use Scenario: Closed-loop current regulation in 24V/48V pneumatic solenoid valves used in factory automation. IC Role / Device Role / Timing Role: Low-latency current monitor providing real-time feedback to PWM controller for force consistency. Use Value: 1.3µs CM recovery time prevents false overcurrent trips during rapid valve actuation transients. | Use Scenario: Input conditioning stage for isolated high-voltage current measurements in grid-tied inverters and UPS systems. IC Role / Device Role / Timing Role: First-stage analog signal conditioner before isolation amplifier or sigma-delta ADC. Use Value: 96dB DC CMRR suppresses 50/60Hz leakage and switching noise; REF pin flexibility simplifies level-shifting to isolated domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain, 4V/V optional; 800kHz bandwidth; integrated 2.5V reference; SOIC-8 package. | Lacks FMEA pinout; lower bandwidth limits PWM ripple rejection; no 50V/V option. | Choose for cost-sensitive automotive designs needing integrated reference and lower gain. |
| MAX40056ATA+T | 50V/V gain; 1.5MHz bandwidth; –5V to 65V CM range; 8-pin TDFN; no FMEA pinout. | Lower max CM voltage excludes 80V applications; smaller package increases layout sensitivity to parasitics. | Choose when board space is constrained and 65V CM suffices; verify PCB layout for EMI robustness. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the LT1999HMS8-50F#PBF uniquely combines 80V common-mode capability, FMEA-optimized pinout, and guaranteed 50V/V gain accuracy (±0.5%) across –40°C to 125°C-making it optimal for high-reliability automotive and industrial current sensing where voltage margin and functional safety are critical.
Availability
LT1999HMS8-50F#PBF is available at Aetrix Electronics and suitable for H-bridge motor control, battery management systems, and industrial solenoid driver applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT1999HMS8-50F#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 product line delivers precision, high-voltage current sensing for safety-critical and high-reliability applications-including automotive EPS, battery monitoring, and industrial motor drives-where wide common-mode range, FMEA-aware design, and AEC-Q100 qualification are mandatory.
FAQ
What is the maximum common-mode voltage the LT1999HMS8-50F#PBF can handle?
The LT1999HMS8-50F#PBF supports an input common-mode voltage range of –5V to 80V, verified per Absolute Maximum Ratings and Electrical Characteristics tables. This allows direct high-side sensing in 48V and 60V battery systems without external level-shifting circuitry. Operation beyond 80V risks triggering internal ESD clamps and degrading accuracy or reliability.
Does the LT1999HMS8-50F#PBF require external resistors to set gain?
No, the LT1999HMS8-50F#PBF has a fixed 50V/V gain implemented with laser-trimmed on-chip resistors (RG = 200kΩ, RIN = 4kΩ). No external gain-setting components are needed-unlike programmable amplifiers-ensuring consistent performance across temperature and unit-to-unit variation.
How does the FMEA-optimized pinout differ from the standard MSOP version of the LT1999?
The LT1999HMS8-50F#PBF uses the FMEA-optimized pinout where Pin 3 is designated NC (no connect), whereas the standard LT1999HMS8-50#PBF assigns Pin 3 to –IN. This prevents accidental shorting of +IN and –IN during PCB assembly or rework-a critical failure mode in ASIL-B/C automotive systems-and simplifies functional safety analysis.
Can the REF pin of the LT1999HMS8-50F#PBF be driven by an external voltage source?
Yes, the REF pin accepts an external voltage between 1.125V and V+–1.125V (for V+ = 5V, range is 1.125V to 3.875V). This allows setting custom output common-mode levels-for example, aligning VOUT with an ADC's input range-or implementing ratiometric sensing. The internal 160k/160k divider is overridden when an external source with ≤0.65MΩ output impedance drives REF.
Is the LT1999HMS8-50F#PBF AEC-Q100 qualified, and what grade does it meet?
Yes, the LT1999HMS8-50F#PBF is AEC-Q100 qualified and meets Grade H requirements, guaranteeing operation from –40°C to 125°C ambient temperature. It is specifically designed for automotive under-hood applications such as electric power steering and battery disconnect units, with full qualification testing including HTOL, TC, and ESD.
LT1999HMS8-50F#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:
- 1.2 MHz
- Current - Input Bias:
- 137.5 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.8mA
- Current - Output / Channel:
- 40 mA
- 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
LT1999HMS8-50F#PBF FAQ
1.How can I place an order for LT1999HMS8-50F#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HMS8-50F#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 LT1999HMS8-50F#PBF reliable?
The price and inventory of LT1999HMS8-50F#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HMS8-50F#PBF is usually 5 days.
3.What payment methods are accepted for LT1999HMS8-50F#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HMS8-50F#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HMS8-50F#PBF?
LT1999HMS8-50F#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HMS8-50F#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 LT1999HMS8-50F#PBF?
For technical support, including LT1999HMS8-50F#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HMS8-50F#PBF requirements.
6.How does Aetrix verify that LT1999HMS8-50F#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999HMS8-50F#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 LT1999HMS8-50F#PBF meets industry standards.
7.What is the process for return or replacement of LT1999HMS8-50F#PBF?
All LT1999HMS8-50F#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HMS8-50F#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 LT1999HMS8-50F#PBF part is unused and in its original packaging.
Return procedure for LT1999HMS8-50F#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1999HMS8-50F#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…
