LT1999IMS8-50#TRPBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
LT1999IMS8-50#TRPBF is an automotive-grade single current sense amplifier from Analog Devices, operating from up to 5.5V supply with 120dB typical CMRR and a fixed gain of 50V/V. It features a current-feedback architecture and is housed in an 8-pin MSOP package, ideal for high-side and low-side current monitoring in automotive and industrial systems.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LT1999IMS8-50#TRPBF Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 120dB typical CMRR enables accurate current measurement on high-voltage rails with large common-mode swings in automotive environments
- Fixed 50V/V gain simplifies circuit design by eliminating external gain-setting resistors and reducing calibration requirements
- Current-feedback architecture with internal frequency compensation ensures stable operation without external compensation networks
- Automotive-grade 8-pin MSOP package meets AEC-Q100 environmental standards for in-vehicle power monitoring applications
Applications
The LT1999IMS8-50#TRPBF is designed for high-side and low-side current sensing in automotive battery management systems, motor drive controllers, and DC-DC converter feedback loops requiring accurate current monitoring with 120dB CMRR. Its 50V/V fixed gain and 5.5V supply operation make it straightforward to integrate into shunt-based current measurement circuits in 12V and 24V automotive architectures. Industrial power supplies and inverter designs also use this device to monitor load current and implement overcurrent protection without discrete differential amplifier networks.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1660 |
| YTEOL | 10 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | CURRENT-FEEDBACK |
| Average Bias Current-Max (IIB) | 1500 µA |
| Common-mode Reject Ratio-Nom | 120dB |
| 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 |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| 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 | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| 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 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Why does the LT1999IMS8-50#TRPBF's 120dB CMRR matter specifically for automotive high-side current sensing?
In automotive high-side current sensing the amplifier input common-mode voltage can swing from ground to the battery rail at 12V to 48V while the shunt signal is only a few millivolts; the LT1999IMS8-50#TRPBF's 120dB typical CMRR attenuates common-mode interference by a factor of one million, ensuring the 50V/V gain amplifies only the differential shunt signal and not rail noise.
What does the fixed 50V/V gain of the LT1999IMS8-50#TRPBF mean for shunt resistor selection in a 10A current monitoring circuit?
With a fixed gain of 50V/V, a 1mΩ shunt resistor at 10A produces 10mV across the shunt, and the LT1999IMS8-50#TRPBF amplifies that to 500mV at the output — a signal level directly compatible with most 12-bit ADC input ranges without additional gain stages, simplifying the 5.5V-supply current measurement signal chain to just the shunt and the IC.
Can the LT1999IMS8-50#TRPBF be used for low-side current sensing in a motor controller, and what are the key constraints?
Yes, the LT1999IMS8-50#TRPBF supports low-side current sensing where the shunt is placed between the motor return path and ground; in this configuration the common-mode voltage is near 0V, the 120dB CMRR ensures ground-bounce rejection, and the 5.5V supply allows the output to swing cleanly to represent motor currents up to the shunt-defined full-scale within the amplifier's 50V/V gain range.
How does the 8-pin MSOP package of the LT1999IMS8-50#TRPBF fit into an automotive ECU design where PCB space is a premium?
The 8-pin MSOP package of the LT1999IMS8-50#TRPBF measures approximately 3mm x 3mm, which is significantly smaller than an SOIC-8 at 5mm x 4mm, and its tape-and-reel format suits automated assembly in automotive ECU production runs where per-board area and pick-and-place cycle time are critical cost drivers.
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