My Inquiry
My Account
Analog Devices Inc. LT1999HS8-20#PBF
- Part No.:
- LT1999HS8-20#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1999HS8-20#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:287
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1999HS8-20#PBF from Analog Devices is a high-speed, bidirectional current sense amplifier with 20V/V fixed gain, –5V to 80V input common mode range, 2MHz bandwidth, and AEC-Q100 qualification for automotive H-bridge motor control and battery charge monitoring.
For engineers reviewing the LT1999HS8-20#PBF datasheet, LT1999HS8-20#PBF pinout, LT1999HS8-20#PBF application, or LT1999HS8-20#PBF equivalent, this page delivers verified specifications, FMEA-optimized SO-8 pinout, thermal performance up to 125°C ambient, and real-world use cases in high-voltage PWM control loops and solenoid current sensing.
Technical Context
The LT1999HS8-20#PBF employs a matched resistor-based transconductance architecture with internal 4kΩ differential input impedance and 80kΩ gain-setting resistor to achieve precise 20V/V amplification. Its dual-path biasing (D1 conduction below V+, high-impedance operation above V+) ensures smooth, continuous operation across the full –5V to 80V common mode range without gain discontinuity or offset shift.
It integrates a mid-supply reference generator (160k/160k divider), shutdown control with <10µA quiescent current, and robust ESD protection (4kV HBM). The output drives ≥200pF loads directly and features 3V/µs slew rate with 2.5µs 0.5% settling for ±2V steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V ±0.5% - enables accurate 50mV full-scale shunt voltage detection for ±100A sensing with 200µΩ resistor |
| Common Mode Range | –5V to 80V - supports high-side sensing in 48V automotive systems and low-side sensing down to negative rail |
| Bandwidth | 2MHz - captures fast current transients in PWM switching power supplies operating up to 500kHz |
| Input Offset Voltage | ±1.5mV max - contributes ≤75µV error at 20× gain, critical for precision battery charge/discharge monitoring |
| Supply Current | 1.55mA active / <10µA shutdown - enables always-on monitoring with ultra-low standby power in EV BMS |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive applications per AEC-Q100 Grade H |
| CMRR | ≥96dB at DC, >80dB at 100kHz - rejects noise from noisy high-voltage rails in motor drive inverters |
Pinout & Package
LT1999HS8-20#PBF uses an 8-lead plastic SO (narrow) package with standard SOIC-8 footprint (S8), 1.27mm pitch, and thermal resistance θJA = 190°C/W. Pinout matches original MSOP configuration but adapted to SO-8 physical layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 4) | Power supply input | Internally tied pins accept 4.5V–5.5V; supports single 5V rail; lower voltages possible but not specified |
| +IN (Pin 2) | Positive sense input | High-impedance node (≥3.6MΩ at low VCM) for connection to high-side of shunt resistor |
| –IN (Pin 3) | Negative sense input | Differential partner to +IN; matched input structure ensures <0.5% gain error over temperature |
| GND (Pin 5) | Analog ground reference | Return path for REF divider and output stage; must be low-impedance for CMRR integrity |
| REF (Pin 6) | Output common-mode reference | Set to mid-supply by internal 160k/160k divider; externally overdrivable from 1.125V to V+–1.125V |
| OUT (Pin 7) | Amplified output | Low-impedance (0.15Ω) rail-to-rail capable output; drives ADC inputs or comparator thresholds directly |
| SHDN (Pin 8) | Shutdown enable | Active-low logic input; <0.5V asserts shutdown (<10µA IQ); floating defaults to active via 2µA internal pull-up |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-optimized SO-8 pinout | Pin 3 is NC (no connection), eliminating risk of misrouting –IN to unintended net in safety-critical automotive designs |
| Bidirectional current sensing | Output polarity relative to REF indicates current direction - essential for regenerative braking and battery charge/discharge state detection |
| Robust common mode step recovery | 1µs recovery from ±50V CM transient - maintains accuracy during fast-switching inverter commutation |
| AEC-Q100 qualified | Grade H (–40°C to 125°C) qualification confirmed - meets automotive reliability and stress test requirements |
| ESD tolerance | 4kV HBM / 1kV CDM - withstands handling and board-level ESD events without latch-up or parameter shift |
Applications
| Motor Control Feedback | Battery Management System |
|---|---|
Use Scenario: Real-time phase current measurement in 48V automotive HVAC blower motor H-bridge inverters. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier converting shunt voltage to scaled analog output synchronized with PWM switching. Use Value: Enables closed-loop torque control and overcurrent protection with <1.5mV offset error, supporting ASIL-B functional safety decomposition. | Use Scenario: Monitoring charge/discharge current in 12V/48V dual-battery architectures during engine start-stop cycles. IC Role / Device Role / Timing Role: High-side current sensor interfacing to microcontroller ADC with mid-supply referenced output for rail-independent measurement. Use Value: Accurate ±0.5% gain and –5V to 80V CM range allow direct sensing across battery terminals without level-shifting circuitry. |
| Solenoid Actuator Monitoring | PWM Power Supply Loop Sensing |
Use Scenario: Diagnosing coil health and detecting open/short faults in automotive transmission solenoids. IC Role / Device Role / Timing Role: Low-latency current monitor capturing inrush, hold, and decay profiles during 10ms–100ms actuation pulses. Use Value: 2MHz bandwidth and 2.5µs settling time capture transient behavior; shutdown mode reduces system power during idle. | Use Scenario: Output current feedback in isolated DC-DC converters for telecom and industrial power supplies. IC Role / Device Role / Timing Role: Isolated-side current sense amplifier providing fast, accurate signal to primary-side controller via optocoupler or digital isolator. Use Value: 80V absolute maximum CM rating and 96dB DC CMRR reject switching noise on high-voltage secondary rails. |
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, but only 400kHz bandwidth and no internal REF divider; requires external reference. | Lower bandwidth limits use in >200kHz PWM systems; lacks integrated mid-supply reference simplifying layout but adds BOM cost. | Select when cost-sensitive designs tolerate reduced speed and can accommodate external REF routing. |
| MAX40056ASA+T | 20V/V gain, 65V CM range, 1.5MHz bandwidth, and integrated 2.5V REF; smaller 8-pin WLP package. | Lower CM range excludes 80V applications like certain industrial motor drives; WLP footprint requires rework for legacy SO-8 layouts. | Select for space-constrained consumer or industrial designs where 65V CM suffices and WLP assembly is supported. |
Compared with INA240A1QDRQ1 and MAX40056ASA+T, the LT1999HS8-20#PBF uniquely combines AEC-Q100 Grade H qualification, 2MHz bandwidth, integrated mid-supply REF, and FMEA-optimized SO-8 pinout - making it the only choice for high-reliability, high-speed automotive motor control requiring zero-layout-risk implementation.
Availability
LT1999HS8-20#PBF is available at Aetrix Electronics and suitable for automotive H-bridge motor control, battery management systems, and industrial solenoid monitoring requiring stable component supply across extended temperature ranges.
Supply support for LT1999HS8-20#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 automotive and industrial power systems - engineered specifically for robustness in harsh electromagnetic and thermal environments.
FAQ
What is the maximum common mode voltage the LT1999HS8-20#PBF can handle?
The LT1999HS8-20#PBF supports a continuous input common mode voltage range of –5V to 80V. This allows direct high-side sensing in 48V automotive systems and compatibility with industrial 60V+ rails. Absolute maximum ratings permit brief exposure to –5.25V to 88V, but sustained operation beyond 80V may degrade performance or reliability.
Does the LT1999HS8-20#PBF require external components to set its gain?
No, the LT1999HS8-20#PBF has a factory-trimmed fixed gain of 20V/V. Gain is set by internal laser-trimmed resistors (RIN = 4kΩ, RG = 80kΩ) and requires no external components. This eliminates gain-setting errors and PCB area associated with discrete resistor networks.
How does the REF pin function in the LT1999HS8-20#PBF?
The REF pin in the LT1999HS8-20#PBF sets the output common-mode voltage. Internally biased to mid-supply (2.5V at 5V V+) via 160k/160k resistors, it can be overdriven externally between 1.125V and V+–1.125V. Output voltage is defined as VOUT = 20 × (V+IN – V–IN) + VREF, enabling flexible level-shifting for ADC interfacing.
Is the LT1999HS8-20#PBF pin-compatible with other LT1999 variants?
Yes, all LT1999 variants including LT1999HS8-20#PBF share identical SO-8 pinout and electrical interface. The "H" denotes –40°C to 125°C operation, "S8" confirms SO-8 package, and "20" specifies 20V/V gain - but pin functions, timing, and biasing remain fully consistent across gain options and temperature grades.
What is the purpose of the NC pin in the LT1999HS8-20#PBF SO-8 package?
Pin 3 in the LT1999HS8-20#PBF SO-8 package is designated NC (No Connect) - a deliberate FMEA enhancement. Unlike the original MSOP version where Pin 3 is –IN, this SO-8 variant relocates –IN to Pin 2 and leaves Pin 3 unconnected to prevent accidental shorting or misrouting of the critical negative sense input in safety-critical automotive PCB layouts.
LT1999HS8-20#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:
- 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-SO
LT1999HS8-20#PBF FAQ
1.How can I place an order for LT1999HS8-20#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1999HS8-20#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 LT1999HS8-20#PBF reliable?
The price and inventory of LT1999HS8-20#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1999HS8-20#PBF is usually 5 days.
3.What payment methods are accepted for LT1999HS8-20#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1999HS8-20#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1999HS8-20#PBF?
LT1999HS8-20#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1999HS8-20#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 LT1999HS8-20#PBF?
For technical support, including LT1999HS8-20#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1999HS8-20#PBF requirements.
6.How does Aetrix verify that LT1999HS8-20#PBF is sourced from the original manufacturer or authorized distributors?
All LT1999HS8-20#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 LT1999HS8-20#PBF meets industry standards.
7.What is the process for return or replacement of LT1999HS8-20#PBF?
All LT1999HS8-20#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1999HS8-20#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 LT1999HS8-20#PBF part is unused and in its original packaging.
Return procedure for LT1999HS8-20#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1999HS8-20#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…
