MAX1139MEEE+T - 12-Ch 10-Bit SAR ADC I2C | Maxim Integrated
MPN: MAX1139MEEE+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.16 | $61.60 |
| 100 | $5.48 | $548.00 |
| 500 | $4.93 | $2,465.00 |
| 1,000 | $4.38 | $4,380.00 |
| 2,500 | $3.9 | $9,750.00 |
MAX1139MEEE+T Overview
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary search algorithm against an internal precision DAC to convert an analog input voltage into a digital code, one bit per clock cycle. SAR ADCs occupy the middle ground between slow but precise integrating/delta-sigma ADCs and fast but power-hungry flash ADCs: they offer 8-18 bit resolution, moderate sampling rates (up to several MSPS), zero-latency single-shot conversion, and low power consumption. Within the broader data-converter hierarchy, the MAX1139 belongs to: SAR ADC -> ADC -> Data Converter -> Mixed-Signal IC -> Semiconductor.
Key specifications include 10-bit resolution, 6 or 12 single-ended input channels (software-configurable via the setup byte), an internal 2.048V reference, an I2C-compatible 2-wire serial interface with up to 400 kHz fast-mode support, an integrated track/hold amplifier, and an internal clock. The device operates over the -40C to +85C extended industrial temperature range. The MAX1136-MAX1139 family offers pin-compatible 4-channel MAX1136/MAX1137 (8-pin uMAX) and 12-channel MAX1138/MAX1139 (16-pin QSOP) variants sharing the same register set and serial protocol, enabling drop-in migration between channel counts and reference voltages (2.048V vs 4.096V) on the same I2C bus.
Typical applications include portable and battery-powered instrumentation, system monitoring in networking and server hardware, multi-cell battery monitoring, power-supply supervision, sensor signal conditioning, and consumer-electronics front panels. The internal reference and small QSOP footprint minimize external component count, and the I2C interface allows up to four devices on a single 2-wire bus by selecting different slave addresses via external address pins.
When designing with this part, observe I2C bus pull-up sizing: with four MAX1139 devices on the bus, total sink current is 4 x 3 mA = 12 mA, which limits pull-up resistor values to keep rise time within the 400 kHz fast-mode budget. The internal reference eliminates an external component but limits absolute accuracy to the trimmed internal value - verify against system calibration requirements before committing to the internal reference option.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing a consolidated engineering reference for the MAX1139MEEE+T.
Drop-in alternatives for MAX1139MEEE+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX1139MEEE+T (same form factor and footprint) — differing in Package, Interface, Internal Reference, Internal Reference Voltage, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1139MEEE+
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →MAX1138MEEE+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1139KEEE+
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.45 / Unit
View Datasheet →MAX1139MEEE+T Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Architecture | SAR (Successive Approximation) |
| Input Channels | 6 or 12 single-ended (software-configurable) |
| Number of Inputs | 6, 12 |
| Supply Voltage | 2.7 V to 3.6 V or 4.5 V to 5.5 V (single supply) |
| Internal Reference Voltage | 2.048 V (MAX1137/MAX1139) |
| Interface | I2C-compatible 2-wire serial (up to 400 kHz fast mode) |
| Integrated Track/Hold | Yes (internal T/H) |
| Internal Clock | Yes (no external clock required) |
| Package | 16-pin QSOP |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (extended industrial) |
| Temperature Grade | Industrial |
| Sampling Method | Single-shot SAR with internal T/H |
| Maximum Devices per I2C Bus | 4 (via external address pins) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
MAX1139MEEE+T Pin Configuration
| Pin 1 | AIN0 — Analog input channel 0 |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 |
| Pin 4 | AIN3 — Analog input channel 3 |
| Pin 5 | GND — Ground |
| Pin 6 | AIN4 — Analog input channel 4 |
| Pin 7 | AIN5 — Analog input channel 5 |
| Pin 8 | REF — Reference voltage (internal 2.048V or external input) |
| Pin 9 | VDD — Positive supply voltage |
| Pin 10 | SDA — I2C serial data |
| Pin 11 | SCL — I2C serial clock |
| Pin 12 | AD0 — I2C slave address select bit 0 |
| Pin 13 | AD1 — I2C slave address select bit 1 |
| Pin 14 | AIN6/AIN8 — Analog input channel 6/8 (config-dependent) |
| Pin 15 | AIN7/AIN9 — Analog input channel 7/9 (config-dependent) |
| Pin 16 | AIN10/AIN11 — Analog input channel 10/11 (config-dependent) |
Typical Applications
MAX1139MEEE+T is suitable for 6 applications: Multi-Cell Battery Monitoring, Portable Instrumentation Front End, System Monitoring in Networking Hardware, Industrial Sensor Signal Conditioning, Consumer Electronics Front Panel Control, Medical Device Signal Acquisition.
Multi-Cell Battery Monitoring
The MAX1139MEEE+T fits battery-monitoring designs because its 12 single-ended input channels can directly monitor individual cell voltages in 4S-12S lithium-ion battery stacks, while the 2.7V minimum supply lets it operate from the lowest cell in the stack without auxiliary rails. The internal 2.048V reference and integrated track/hold yield 10-bit (approximately 2 mV) resolution per channel at conversion rates up to 100 kSPS aggregate, and the I2C interface supports up to four devices for 48 channels total. The part draws microamps in shutdown, extending standby life when the host MCU is sleeping. Designers typically add external dividers for cell stacks above 2.048V per cell and rely on the internal reference to minimize BOM cost versus external-referee alternatives.
Recommended
Portable Instrumentation Front End
For handheld multimeters, data loggers, and field instruments, the MAX1139MEEE+T delivers 12 channels of 10-bit digitization in a tiny 16-pin QSOP package, drawing under 1 mA during conversion and only microamps in standby. The internal 2.048V reference eliminates a separate reference IC, and the I2C bus requires only two wires from the host MCU, freeing GPIOs for display and keypad functions. The -40C to +85C industrial temperature range supports outdoor and industrial environments. Engineers typically pair it with low-power MCUs and a small signal-conditioning op-amp per channel for sensor excitation and protection.
Recommended
System Monitoring in Networking Hardware
Routers, switches, and base stations need to monitor multiple rails, temperatures, and fan speeds - exactly the multi-channel, low-speed ADC use case the MAX1139MEEE+T targets. With 12 single-ended channels and an I2C interface, the part can monitor a complete management subsystem (3.3V, 5V, 12V rails divided down, plus 8 temperature sensors) over a single 2-wire bus alongside other I2C devices. The 400 kHz fast-mode I2C allows polling all channels at sub-second rates without burdening the management MCU. Industrial temperature grade and QSOP surface-mount package suit dense networking PCBs.
Recommended
Industrial Sensor Signal Conditioning
The MAX1139MEEE+T serves industrial 4-20 mA loop, thermistor, and transducer signal conditioning by digitizing up to 12 analog signals and reporting them over I2C to a host controller or PLC. The 10-bit resolution is sufficient for process-control feedback loops where absolute accuracy requirements are in the 1% range. The 4.5V-5.5V supply option supports legacy 5V industrial backplanes, while the 2.7V-3.6V range covers modern 3.3V sensor modules. The integrated track/hold eliminates external sample/hold circuitry for slow-changing process signals, and the QSOP package supports dense multi-sensor I/O modules.
Recommended
Consumer Electronics Front Panel Control
Set-top boxes, white goods, and audio receivers use the MAX1139MEEE+T to read multiple front-panel potentiometers, button matrices (via resistor networks), and indicator voltages while sharing the I2C bus with the main control MCU. The 12 channels handle volume, balance, bass, treble, source selection, and several status inputs in a single chip, with the internal reference and small QSOP footprint minimizing front-panel PCB area. The low shutdown current extends standby power budgets for Energy Star compliance.
Recommended
Medical Device Signal Acquisition
Portable medical devices such as glucose meters, pulse oximeters, and handheld patient monitors use the MAX1139MEEE+T to digitize multiple biosensor signals (electrochemical strips, photodiode currents, battery voltage, temperature compensation) over I2C. The 10-bit resolution suits consumer-grade medical accuracy targets, and the low operating current extends battery life on coin-cell or rechargeable Li-ion power. The industrial temperature range supports clinical environments. The integrated track/hold and internal reference minimize BOM count for cost-sensitive medical disposables and reusable devices alike.
Recommended
Recommended Products Summary
Engineering reference data for MAX1139MEEE+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1139MEEE+ | MAX1138MEEE+T | MAX1139KEEE+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 16-QSOP | 16-QSOP - same | 16-QSOP - same | 16-QSOP - same |
| Resolution | 10 bits | 10 bits | 10 bits | 10 bits |
| Input Channels | 6 / 12 (SW-config) | 6 / 12 (SW-config) | 6 / 12 (SW-config) | 6 / 12 (SW-config) |
| Internal Reference | 2.048 V | 2.048 V | 4.096 V | 2.048 V |
| Interface | I2C, 400 kHz | I2C, 400 kHz | I2C, 400 kHz | I2C, 400 kHz |
| Supply Voltage | 2.7-3.6 V / 4.5-5.5 V | 2.7-3.6 V / 4.5-5.5 V | 2.7-3.6 V / 4.5-5.5 V | 2.7-3.6 V / 4.5-5.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C (extended K grade) |
| Packaging Format | Tape & Reel | Tube | Tape & Reel | Tube |
Key Differentiators
- Software-configurable 6 or 12 single-ended channels in same package (vs MAX1138MEEE+T)
- Internal 2.048V reference optimized for low-voltage sensors (vs MAX1138MEEE+T)
- Same QSOP-16 footprint as MAX1138 enables drop-in reference-voltage migration (vs MAX1138MEEE+T)
Design Notes
Route the analog input traces away from digital switching lines (SCL, SDA, VDD) to minimize crosstalk into the ADC's track/hold. Keep analog input traces short and add a small RC filter (10 ohm + 100 pF typical) at each AIN pin if the source impedance is above 1 kohm. Place the 0.1 uF VDD bypass capacitor as close as possible to the VDD pin, and add a 10 uF bulk capacitor if the supply is shared with switching regulators.
Do not exceed the absolute maximum analog input voltage of VDD + 0.3V on any AIN pin, or latch-up may occur. When using external resistor dividers to monitor signals above VDD, add a clamping diode (e.g. BAV99) to VDD to protect the input. Also, when operating at the 5V supply range, ensure I2C pull-ups are tied to the same 5V rail so logic-high levels are within spec for both the MAX1139 and the host MCU.
For multi-device I2C buses (up to 4 MAX1139 devices), total sink current is 4 x 3 mA = 12 mA. With a 3.3V supply, this gives a minimum pull-up resistance of 3.3V / 12 mA = 275 ohm; in practice use 1 kohm to 4.7 kohm pull-ups to balance rise time against power dissipation. Verify rise time is below 300 ns for 400 kHz fast-mode I2C compliance by checking the bus capacitance budget (typically < 100 pF for 4 devices).
Compliance Information
RoHS-compliant per distributor listings; lead-free finish confirmed. AEC-Q100 not applicable - industrial-grade part. Halogen-free status not explicitly stated in retrieved web data.
