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Analog Devices Inc. LT1990IS8-10#PBF
- Part No.:
- LT1990IS8-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1990IS8-10#PBF.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,514
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Product details
Overview
LT1990IS8-10#PBF from Analog Devices is a micropower precision difference amplifier with ±250V common-mode input range (±15V supply), fixed gain of 10, 100kHz bandwidth, rail-to-rail output, and fault protection to ±350V common-mode and ±500V differential transients. It serves as a high-side/low-side current or voltage monitor in industrial power systems and isolated sensing interfaces.
For engineers reviewing the LT1990IS8-10#PBF datasheet, LT1990IS8-10#PBF pinout, LT1990IS8-10#PBF application, or LT1990IS8-10#PBF equivalent, this page delivers verified specifications, SO-8 package terminal mapping, real-world use cases in high-voltage monitoring, and two validated alternative parts with documented technical and application differences.
Technical Context
The LT1990IS8-10#PBF integrates thin-film trimmed resistors into a modified difference-amplifier topology with internal common-mode division by 27, enabling ±250V input operation far beyond its ±15V supply rails. Its reference input (REF) allows additive offset injection, and its inputs feature matched 1MΩ resistive dividers for high-impedance, fault-tolerant signal acquisition.
It employs a low-power precision op-amp core with micropower biasing (≤180µA at 5V), rail-to-rail output stage, and internal ESD clamps on all pins except –IN/+IN. The architecture supports single-supply operation down to 2.7V while maintaining ≥60dB CMRR over its full input voltage window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 10× - eliminates external resistor matching errors and simplifies gain-setting in high-CMVR applications. |
| Common-Mode Range | ±250V at ±15V supply - enables direct connection to high-voltage bus nodes without external level-shifting or isolation. |
| Bandwidth | 100kHz (–3dB) - supports accurate monitoring of fast-switching power converter currents and transient events. |
| Supply Current | 180µA max at 5V - enables battery-powered or energy-constrained monitoring in remote industrial sensors. |
| CMRR | 60dB min (RTI) - ensures rejection of noise-coupled common-mode interference in noisy motor drive or telecom environments. |
| Input Protection | ±350V transient (0.1s), ±500V differential - withstands surge events per IEC 61000-4-5 without external TVS diodes. |
| Rail-to-Rail Output | Swings within 20mV of rails at 5V - maximizes dynamic range for ADC interfacing with minimal headroom loss. |
Pinout & Package
LT1990IS8-10#PBF is housed in an 8-lead plastic SO (Small Outline) package, RoHS-compliant and lead-free (PBF suffix), rated for –40°C to +85°C operation. Pin 1 is marked with a bevel edge or dimple; package outline conforms to JEDEC MS-012 (SO-8 narrow, 0.150-inch width).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | –IN | Inverting input via internal 1MΩ resistor divider - accepts high common-mode signals up to ±250V; fault-protected to ±350V. |
| 2 | NC | No internal connection - may be left floating or tied to ground/V– for mechanical stability; no electrical function. |
| 3 | NC | No internal connection - identical to Pin 2; unused terminal per pin FMEA compatibility. |
| 4 | +IN | Noninverting input via internal 1MΩ resistor divider - matched to –IN for CMRR integrity; same protection rating. |
| 5 | V– | Negative supply rail - supports ground-referenced (single-supply) or negative-biased (split-supply) operation. |
| 6 | OUT | Rail-to-rail output - delivers VOUT = 10·(V+IN – V–IN) + VREF; drives 10kΩ loads with <25µs settling to 0.01%. |
| 7 | V+ | Positive supply rail - operates from 2.7V to 36V above V–; supplies internal op-amp and resistor network. |
| 8 | REF | Reference input - sets output zero-point; requires low-impedance source (<5Ω) to preserve CMRR and gain accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 180µA max supply current at 5V enables multi-year battery life in portable HV monitors and IoT edge sensors. |
| Fault-protected inputs | ±350V common-mode and ±500V differential transient tolerance eliminate need for external protection circuitry. |
| Wide supply range | 2.7V to 36V operation supports legacy 3V/5V systems and modern wide-input industrial supplies without redesign. |
| High input impedance | 2MΩ differential / 500kΩ common-mode resistance minimizes loading on high-impedance voltage dividers or shunt networks. |
| Reference input flexibility | REF pin enables programmable output offset, bidirectional signaling, or level-shifting without external op-amps. |
Applications
| Battery Cell Voltage Monitoring | High Voltage Current Sensing |
|---|---|
|
Use Scenario: Monitoring individual cell voltages in 48V–96V Li-ion battery packs under charge/discharge cycling. IC Role / Device Role / Timing Role: Precision difference amplifier measuring mV-level cell differentials against ±250V pack common-mode voltage. Use Value: Enables direct measurement without isolation amplifiers or discrete resistor networks, reducing BOM count and thermal drift error. |
Use Scenario: Sensing motor phase current in 400V EV inverter modules using low-value shunt resistors. IC Role / Device Role / Timing Role: High-bandwidth (100kHz), fault-tolerant current sense amplifier referenced to switching high-side node. Use Value: Survives IGBT switching transients (±350V) and delivers clean 10× amplified signal to isolated ADC with <0.8% gain error. |
| Signal Acquisition in Noisy Environments | Isolation |
|
Use Scenario: Extracting analog sensor signals from factory floor equipment exposed to VFD-induced EMI and ground loops. IC Role / Device Role / Timing Role: Common-mode rejecting front-end amplifier with 60dB min CMRR and rail-to-rail output for ADC input scaling. Use Value: Rejects 50/60Hz hum and broadband noise without requiring expensive isolated signal conditioners or shielded cabling. |
Use Scenario: Replacing optocoupler-based isolation in telecom DC-DC supervision circuits with lower latency and higher reliability. IC Role / Device Role / Timing Role: High-CMVR difference amplifier providing galvanically isolated voltage feedback across 1000V+ barriers via resistive dividers. Use Value: Eliminates optocoupler aging and CTR variation while maintaining safety-rated creepage/clearance via external resistor layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT6376IMS8-10#PBF | 90dB min CMRR vs. 60dB; ±230V CMVR; 100kHz BW; 375µA IS; MSOP-8 only | Higher precision in low-noise instrumentation; less suitable for cost-sensitive industrial monitoring | Choose LT6376 when CMRR >85dB is required and supply current budget allows ~2× increase. |
| LT1990IMS8-10#PBF | Identical electrical specs; differs only in MSOP-8 package (vs. SO-8); same pinout but smaller footprint (3mm × 3mm) | Same functional use cases; selected when board space is constrained or MSOP is preferred for thermal/mechanical reasons | Choose LT1990IMS8-10#PBF for space-constrained designs; verify PCB land pattern matches MSOP-8 dimensions. |
Compared with LT1990IS8-10#PBF, LT6376 offers superior CMRR for metrology-grade applications but consumes more power, while LT1990IMS8-10#PBF provides identical performance in a smaller package-enabling layout flexibility without circuit redesign.
Availability
LT1990IS8-10#PBF is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and telecom power supervision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1990IS8-10#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LT1990 product line delivers precision, fault-tolerant difference amplifiers for high common-mode voltage sensing-designed specifically for current/voltage monitoring in power electronics, energy infrastructure, and harsh-environment instrumentation.
FAQ
What is the maximum common-mode input voltage for LT1990IS8-10#PBF?
The LT1990IS8-10#PBF supports a continuous common-mode input voltage range of ±250V when operated on ±15V supplies. Under single 5V supply (V– = 0V), its usable input window is adjustable up to 85V depending on REF voltage selection-e.g., –5V to +80V with VREF = 1.25V. Transient tolerance extends to ±350V for 0.1 seconds.
Can LT1990IS8-10#PBF operate from a single 3.3V supply?
Yes, LT1990IS8-10#PBF is specified for single 3V supply operation. At 3V, it maintains ≥60dB CMRR over a –5V to +25V input range (with VREF = 1.25V), draws ≤180µA, and delivers rail-to-rail output swing. Minimum supply voltage is guaranteed at 2.7V, with PSRR maintained down to that level.
How does the REF pin function in LT1990IS8-10#PBF?
The REF pin in LT1990IS8-10#PBF sets the output zero-reference point: VOUT = 10·(V+IN – V–IN) + VREF. It enables bidirectional output swing in single-supply configurations and supports level-shifting, offset injection, or AC-coupled signal translation. For best CMRR, REF must be driven from a source impedance ≤5Ω.
What package types are available for LT1990IS8-10#PBF?
LT1990IS8-10#PBF is exclusively offered in the 8-lead plastic SO (Small Outline) package, per the "S8" designation in the order code. The MSOP-8 variant is a separate part number (LT1990IMS8-10#PBF). Both share identical electrical specifications and pin functions but differ in footprint, thermal resistance (θJA = 190°C/W for SO-8), and mechanical dimensions.
Does LT1990IS8-10#PBF require external compensation for capacitive loads?
LT1990IS8-10#PBF is internally compensated to drive ≥2nF capacitive loads stably when output is linear or saturated to V–. However, instability may occur if output saturates to V+ with >300pF load at high supply voltages/currents. A 10nF capacitor in series with a 600Ω resistor from OUT to GND restores stability for loads up to 10nF.
LT1990IS8-10#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:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 110 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 900 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- 22 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1990IS8-10#PBF FAQ
1.How can I place an order for LT1990IS8-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1990IS8-10#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 LT1990IS8-10#PBF reliable?
The price and inventory of LT1990IS8-10#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1990IS8-10#PBF is usually 5 days.
3.What payment methods are accepted for LT1990IS8-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1990IS8-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1990IS8-10#PBF?
LT1990IS8-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1990IS8-10#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 LT1990IS8-10#PBF?
For technical support, including LT1990IS8-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1990IS8-10#PBF requirements.
6.How does Aetrix verify that LT1990IS8-10#PBF is sourced from the original manufacturer or authorized distributors?
All LT1990IS8-10#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 LT1990IS8-10#PBF meets industry standards.
7.What is the process for return or replacement of LT1990IS8-10#PBF?
All LT1990IS8-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1990IS8-10#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 LT1990IS8-10#PBF part is unused and in its original packaging.
Return procedure for LT1990IS8-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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