MAX9938FEUK+ Analog Devices Integrated Circuit (SOT23 (5-Pin)) In Stock
The MAX9938FEUK+ is a nanoPower precision current-sense amplifier from Analog Devices with a 94 dB minimum CMRR, 600 µV maximum input offset voltage, and voltage-feedback architecture. It is supplied in a 5-pin SOT-23 package for compact battery current monitoring and power management circuits.
- Manufacturer
- Analog Devices
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- MAX9938FEUK+ 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
- nanoPower quiescent current enables continuous current sensing in battery-operated devices without significant drain
- 94 dB minimum CMRR (130 dB typical) provides excellent common-mode rejection for high-side current sensing on noisy rails
- 600 µV maximum input offset voltage ensures precise milliamp-level current measurement accuracy across temperature
- Voltage-feedback architecture with frequency compensation delivers stable, wideband current-sense amplification
- 5-pin SOT-23 package (SOT-23-5) offers a compact, industry-standard footprint for space-constrained power monitoring
Applications
The MAX9938FEUK+ is used in battery fuel gauges, portable power banks, and handheld medical devices where nanoPower quiescent current and precision current sensing are required simultaneously to maximize battery life. It also serves in motor current monitoring, LED driver feedback loops, and multi-cell battery management systems that need accurate milliamp-resolution measurement with a high common-mode voltage on the sense resistor.
Specifications
| Manufacturer Package Code | 5-SOT_23-N/A |
| Date Of Intro | 2008-05-14 |
| YTEOL | 10 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Common-mode Reject Ratio-Min | 94dB |
| Common-mode Reject Ratio-Nom | 130dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 600 µV |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e3 |
| Low-Bias | NO |
| Low-Offset | YES |
| Micropower | YES |
| Neg Supply Voltage Limit-Max | -15 V |
| Neg Supply Voltage-Nom (Vsup) | -3.6 V |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSOP5/6,.11,37 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Supply Current-Max | 0.0025mA |
| Supply Voltage Limit-Max | 15V |
| Supply Voltage-Nom (Vsup) | 3.6V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Unity Gain BW-Nom | 125 |
| Voltage Gain-Min | 50 |
| Wideband | NO |
| Package | SOT23 (5-Pin) |
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 | Japan, Mainland China, Malaysia, Philippines, Singapore, South Korea, Taiwan, Thailand, USA |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the 94 dB minimum CMRR of MAX9938FEUK+ benefit high-side current sensing in switching power supplies?
A minimum CMRR of 94 dB (typical 130 dB) means that common-mode voltage variations of several volts on a high-side sense resistor produce less than 1 mV of differential error at the amplifier output. This allows accurate current measurement even when the power rail has significant switching noise or ground-referenced voltage shifts in the tens of millivolts range.
What is the input offset voltage specification of MAX9938FEUK+, and how does it affect measurement accuracy at low currents?
The MAX9938FEUK+ specifies a maximum input offset voltage of 600 µV. For a 10 mΩ sense resistor, this offset translates to a maximum current measurement error of 60 mA, so designs sensing currents below 100 mA should use a larger sense resistor or factor in the offset budget during accuracy analysis over the full operating temperature range.
Does the nanoPower quiescent current of MAX9938FEUK+ make it suitable for always-on current monitoring in coin-cell powered IoT devices?
Yes. The nanoPower quiescent current of MAX9938FEUK+ is in the nanoamp range, so continuous current monitoring with this amplifier adds negligible drain to a coin cell that may only budget a few microamps average. This makes it ideal for always-on current sensing in IoT edge nodes, asset trackers, and wearables powered by CR2032 or equivalent 3 V cells.
Related Guides
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
ADAQ7768-1 Design Guide for Precision Vibration and Dynamic Signal Measurement
Design ADAQ7768-1 precision data acquisition channels for vibration and dynamic sensing with the right bandwidth, reference, clock, and layout choices.
Jun 30, 2026
AD5204BRZ10 Design Guide for SPI-Controlled Gain and Offset Calibration
Design AD5204BRZ10 digital potentiometer calibration loops with bounded trim span, safe wiper current, clean SPI routing, and reliable startup codes.
Jun 30, 2026
Why Buy from FindMyChip
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.
More from Analog Devices
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”