LT1999IMS8-20F#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
Analog Devices LT1999IMS8-20F#PBF is a high-voltage bidirectional current sense amplifier with a fixed gain of 20, engineered for pin-level FMEA robustness. Provides 105 dB CMRR and 1500 µV max input offset in an 8-pin MSOP package. Available from stock worldwide with fast shipping.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LT1999IMS8-20F#PBF 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
- Bidirectional current sensing with fixed 20x gain enables monitoring of both charge and discharge currents without external resistor networks
- High-voltage common-mode input range tolerates bus voltages well above the supply rail for direct shunt monitoring on 12 V to 60 V power lines
- Pin FMEA engineering ensures safe operation under single-pin fault conditions, meeting stringent automotive and industrial safety standards
Applications
The LT1999IMS8-20F#PBF is purpose-built for high-side and low-side bidirectional current monitoring in motor drives, battery management systems, and industrial power converters. Its FMEA-hardened design makes it a natural choice for functional-safety applications in automotive powertrain and ADAS systems where a single pin fault must not cause catastrophic failure. The compact 8-pin MSOP package and fixed 20x gain reduce external component count and simplify signal-chain calibration.
Specifications
| 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 | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Voltage Gain-Min | 19.9 |
| 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 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What does the fixed gain of 20 in the LT1999IMS8-20F#PBF mean for shunt resistor selection?
With a fixed gain of 20, the LT1999IMS8-20F#PBF amplifies the shunt voltage drop by exactly 20x before the ADC input. For a 100 mA to 10 A measurement range with a 10 mOhm shunt, the output spans 20 mV to 2 V, fitting neatly within a 2.5 V reference ADC range and requiring no external gain-setting resistors, which reduces PCB area and eliminates resistor mismatch errors.
How does the 105 dB CMRR of the LT1999IMS8-20F#PBF prevent measurement errors on a noisy 48 V automotive bus?
At 105 dB typical CMRR, the LT1999IMS8-20F#PBF attenuates 48 V common-mode bus noise by more than 177,000x relative to the differential shunt signal. Even with 1 V peak-to-peak switching noise on the bus, the error at the output is below 6 µV referred to input, keeping current measurement accuracy within 0.1% for milliohm-range shunt resistors in high-current automotive applications.
In what scenario should a designer choose the 20x gain variant over a 10x or 50x gain LT1999 variant?
The 20x gain variant of the LT1999 is the best match when the full-scale shunt voltage is between 75 mV and 125 mV, mapping the output into the 1.5 V to 2.5 V ADC range common on 2.5 V or 3.3 V microcontrollers. A 10x variant would under-utilize ADC dynamic range with small shunts, while a 50x variant saturates with shunt voltages above 50 mV, so 20x covers the widest shunt impedance range for 5 A to 20 A measurement applications.
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