LT1999CMS8-50F#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
The LT1999CMS8-50F#PBF is a high-voltage bidirectional current sense amplifier from Analog Devices engineered for pin FMEA compliance with 105 dB typical CMRR and 1.5 mV maximum offset voltage. It supports current-feedback architecture with 50x gain in an 8-pin MSOP package for robust current monitoring applications. Available worldwide for motor drives, power converters, and industrial current sensing designs.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LT1999CMS8-50F#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.6800(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LT1999CMS8-50F#PBF?
- Bidirectional high-voltage current sensing supporting both positive and negative load current measurement
- 105 dB typical CMRR ensuring accurate measurement on noisy high-voltage power rails up to 76 V
- 50x fixed gain eliminates external resistor programming, simplifying PCB layout and reducing component count
- 1.5 mV maximum input offset voltage providing high measurement accuracy for small shunt voltages
- Pin FMEA engineered design enhancing system safety by defining fail-safe behavior for each open or shorted pin
What is LT1999CMS8-50F#PBF used for?
The LT1999CMS8-50F#PBF is used in bidirectional motor current monitoring and H-bridge control circuits where both forward and reverse current must be accurately measured across high common-mode voltage rails up to 76 V. Its 105 dB CMRR and 50x gain make it suitable for solar inverter current sense stages, battery charger current loops, and DC-DC converter feedback paths requiring millivolt-level shunt voltage detection. The pin FMEA compliance benefits safety-critical industrial designs such as servo drives and power supply protection circuits where individual pin failure modes must be analyzed and tolerated.
What are the specifications of LT1999CMS8-50F#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1660 |
| YTEOL | 10 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | CURRENT-FEEDBACK |
| Average Bias Current-Max (IIB) | 2350 µA |
| Common-mode Reject Ratio-Nom | 105dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 1500 µV |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| Low-Bias | NO |
| Low-Offset | NO |
| Micropower | NO |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | NO |
| Slew Rate-Nom | 3V/us |
| Supply Current-Max | 1.9mA |
| Supply Voltage Limit-Max | 6V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Voltage Gain-Min | 49.75 |
| Wideband | NO |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
| Country of Origin | Malaysia |
Where can I find the LT1999CMS8-50F#PBF datasheet?
LT1999CMS8-50F#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LT1999CMS8-50F#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What common-mode voltage range does LT1999CMS8-50F#PBF support for high-side current sensing on power rails?
LT1999CMS8-50F#PBF supports common-mode input voltages from -4 V to 76 V, enabling high-side current sensing on 12 V, 24 V, 48 V, and 60 V power supply rails without requiring isolated measurement circuits. This 76 V common-mode range covers most industrial DC bus voltages and automotive 48 V mild-hybrid systems, allowing a single device to measure current on both high-side and low-side shunt positions.
How does the 50x fixed gain of LT1999CMS8-50F#PBF simplify current sense circuit design compared to adjustable-gain alternatives?
The 50x factory-trimmed fixed gain eliminates external gain-setting resistors, avoiding resistor mismatch errors that degrade CMRR in discrete differential amplifier designs. With a 1 mΩ shunt and 1 A full-scale current, the 1 mV shunt voltage produces a 50 mV output directly compatible with most 12-bit ADC input ranges. This single-component solution reduces BOM, eliminates gain calibration, and minimizes PCB area compared to programmable-gain or instrumentation amplifier alternatives requiring 3 to 6 external resistors.
What does pin FMEA engineering mean for LT1999CMS8-50F#PBF and how does it benefit safety-critical applications?
Pin FMEA (Failure Mode and Effects Analysis) engineering means Analog Devices has defined and characterized the output behavior for each single-pin failure scenario including open, short-to-supply, and short-to-ground conditions. For motor drive or power converter safety systems requiring IEC 61508 SIL analysis, knowing that LT1999CMS8-50F#PBF outputs a predictable and detectable signal under any 1-pin fault simplifies the safety case documentation and reduces the fault-tolerant design effort for overcurrent protection circuits.
What is the maximum input offset voltage of LT1999CMS8-50F#PBF and how does it affect measurement accuracy at small shunt voltages?
LT1999CMS8-50F#PBF specifies a maximum 1.5 mV input-referred offset voltage. At 50x gain, this contributes up to 75 mV of output offset, which at a 5 V ADC reference with 12-bit resolution corresponds to approximately 61 LSB of zero-current error. For designs using a 5 mΩ shunt with 10 A full-scale (50 mV shunt voltage), the 1.5 mV offset represents 3% full-scale error, requiring software offset calibration in precision current measurement applications needing better than 1% accuracy.
How does LT1999CMS8-50F#PBF compare to INA282 for a 48 V bidirectional motor current measurement design?
LT1999CMS8-50F#PBF covers up to 76 V common-mode versus INA282's 80 V maximum, so both handle 48 V bus voltage with margin. LT1999CMS8-50F#PBF offers 105 dB CMRR versus INA282's 120 dB, slightly lower rejection but sufficient for most 48 V motor drives where switching noise is controlled. The pin FMEA documentation of LT1999CMS8-50F#PBF provides a safety analysis advantage for functional safety programs, while INA282's higher CMRR benefits designs with aggressive PWM-induced common-mode transients up to 80 V.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| 1+ | $3.6500 | $3.65 |
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