NAFE71388B40BS - 8-Ch 24-bit ±25V Analog Front End | NXP
MPN: NAFE71388B40BS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.91 | $15.91 |
| 10 | $14.5 | $145.00 |
| 100 | $13.26 | $1,326.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $11.05 | $11,050.00 |
NAFE71388B40BS Overview
An analog front-end (AFE) is the circuit block that conditions real-world analog signals - voltages, currents, resistances - before digitization, sitting between sensors or field signals and the digital controller in the signal-chain hierarchy: sensor -> AFE -> ADC -> MCU. Universal-input AFEs replace discrete multiplexer, amplifier, reference, and protection stages with a single configurable silicon device, dramatically simplifying PLC, data-acquisition, and test-equipment designs.
Key features include the ±25 V high-voltage input range with internal diode protection on the HV input pins for EMC robustness and miswiring tolerance, the 24-bit delta-sigma converter for high-precision measurement, integrated low-drift voltage reference, and programmable gain and buffer stages that support voltage, current, and resistance measurement modes without external signal conditioning.
Architecturally, the NAFE71388 combines fast HV multiplexers with a precision delta-sigma conversion core, allowing multiple channels to be scanned at high data rates while preserving low offset and low drift - a combination normally achieved only with costly discrete front ends. The internal protection removes the need for elaborate external clamping in many industrial field-wiring scenarios.
Typical applications include industrial programmable logic controller (PLC) analog input modules, building and process control data-acquisition systems, and multifunction test and measurement instrumentation where mixed voltage/current inputs must be handled by one device.
When designing with the NAFE71388, verify the thermal budget: at approximately 135 mW typical dissipation, the 9x9 mm HVQFN package with a solid ground pour is normally sufficient, but confirm channel-scanning data rates against the datasheet conversion-time tables.
This page synthesizes verified distributor data, same-family drop-in alternatives, pricing context, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for NAFE71388B40BS — 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 NAFE71388B40BS (same form factor and footprint) — differing in Input Voltage Range, Package, Product Type, Grade, Power Consumption.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
NAFE71388B40BSE
✅ Drop-In📋 Reference alternative (not in catalog)
NAFE71388B40BSMP
✅ Drop-In📋 Reference alternative (not in catalog)
NAFE11388B40BS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$7.9 / Unit
View Datasheet →NAFE11348B40BS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
Contact for price
View Datasheet →NAFE71388B40BS Maximum Ratings & Electrical Characteristics
| Product Type | Universal input analog front-end (AFE) |
| Number of Input Channels | 8 |
| Input Voltage Range | ±25 V (HV inputs, diode-protected) |
| ADC Resolution | 24 bit (delta-sigma) |
| Power Dissipation | 135 mW (typical) |
| Integrated Multiplexer | Low-leakage high-voltage fast multiplexer |
| PGA | Low-offset, low-drift programmable gain amplifier |
| Voltage Reference | Integrated low-drift voltage reference |
| Input Protection | Internal diode protection on HV input pins (EMC / miswiring) |
| Package | 64-HVQFN (9x9 mm) |
| Grade | Industrial-grade |
| Lifecycle Status | Active |
| RoHS Status | Compliant (per NXP product page environmental data) |
NAFE71388B40BS 64-hvqfn (9x9 mm) Pin Configuration Guide
Pin configuration for NAFE71388B40BS (64-hvqfn (9x9 mm) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for NAFE71388B40BS.
Refer to the datasheet for full pin configuration.
Typical Applications
NAFE71388B40BS is suitable for 6 applications: PLC Analog Input Modules, Building and Process Control Data Acquisition, Test and Measurement Instrumentation, Motor Drive and Inverter Monitoring, Energy Monitoring and Smart Metering, Factory Automation Sensor Hubs.
PLC Analog Input Modules
Industrial programmable logic controller (PLC) analog input cards are the primary application for the NAFE71388B40BS. Its eight ±25 V universal inputs cover standard field signals directly - 0-10 V, ±10 V, and 4-20 mA loops via an external sense resistor - so one device replaces the discrete multiplexer, amplifier, and ADC chain of a legacy input channel. The internal diode protection on the HV input pins tolerates field miswiring and EMC transients common in cabinet environments, while the 24-bit delta-sigma core delivers the accuracy that module datasheets advertise (typical 0.1% class or better). The 64-HVQFN 9x9 mm package permits dense 8/16/32-channel card designs with short analog traces to terminal blocks, and approximately 135 mW dissipation keeps module thermal budgets comfortable without airflow.
Recommended
Building and Process Control Data Acquisition
Building management and process-control systems scan many voltage and current sensors - pressure transmitters, temperature transmitters, valve position feedback - and the NAFE71388B40BS consolidates that front-end into a single 8-channel device. The low-offset, low-drift PGA maintains calibration over years of unattended operation, and the integrated low-drift voltage reference removes an external precision reference from the bill of materials. Because channels are multiplexed by fast HV switches ahead of a high data-rate 24-bit delta-sigma converter, a control loop can scan all eight channels within one scan period while preserving precision. The ±25 V rating with internal protection also survives the overvoltage events typical of large installations where wiring errors during commissioning are common, reducing service cost and downtime.
Recommended
Test and Measurement Instrumentation
Bench and rack multichannel acquisition instruments benefit from the NAFE71388B40BS combination of ±25 V universal inputs and 24-bit precision. Traditional instrument front ends use reed relays plus discrete amplifiers; the NAFE71388 replaces that stage with solid-state HV multiplexers that switch faster and never wear out, improving channel scan rate and long-term reliability. The high data-rate delta-sigma ADC supports both slow high-resolution acquisitions and faster low-resolution scans in one programmable device, which is valuable for instruments offering selectable speed/accuracy modes. At roughly 135 mW, thermal drift inside the enclosure stays low, protecting zero and gain calibration. Its SPI interface connects directly to the instrument FPGA or MCU backplane for deterministic channel sequencing.
Recommended
Motor Drive and Inverter Monitoring
Inverter and motor-drive systems need precise monitoring of DC-bus voltage, phase currents, and temperature feedback. The NAFE71388B40BS measures bus voltages up to its ±25 V input window (with external dividers for higher bus rails) and shunt-derived current signals with 24-bit resolution, giving the drive controller clean feedback for protection and control loops. The internal HV input diode protection is especially useful here, since measurement taps sit near high dv/dt nodes and miswiring during installation can destroy unprotected inputs. Multiplexed scanning lets one AFE service bus voltage, two shunt currents, and thermal channels in a single pass, synchronizing readings under MCU control via SPI. The industrial-grade construction suits the cabinet environment, and the compact 9x9 mm HVQFN fits alongside the gate-driver circuitry.
Recommended
Energy Monitoring and Smart Metering
Submetering and energy-monitoring equipment measures mains-derived voltage and current signals across many channels. The NAFE71388B40BS handles the voltage channels directly within ±25 V (via divider networks from higher potentials) and current channels through CT or shunt inputs, with the 24-bit delta-sigma converter providing the dynamic range needed for accurate power and energy computation at light load. The low-drift integrated reference is critical here: metering accuracy class limits are defined over years, so reference drift directly impacts revenue-grade performance. The eight-channel multiplexed architecture lets a single AFE serve a polyphase meter's multiple voltage and current channels, cutting component count. At approximately 135 mW, it also suits always-on monitoring nodes where power budget and self-heating matter.
Recommended
Factory Automation Sensor Hubs
Automation cells aggregate analog signals from proximity sensors, load cells, position feedback potentiometers, and 4-20 mA transmitters into a controller. The NAFE71388B40BS serves as the sensor-hub front end: its universal inputs accept all of these signal types without external conditioning beyond a sense resistor or divider, and its diode-protected ±25 V inputs survive the wiring faults endemic to retrofit installations. The fast HV multiplexer permits deterministic round-robin scanning so the PLC cycle time is predictable, while the 24-bit conversion supports high-resolution load-cell readings on the same channels that carry coarse 0-10 V sensor signals. Its SPI interface integrates simply with industrial Ethernet or IO-Link bridge MCUs, and the industrial-grade HVQFN package withstands the -40 C to +85 C cabinet ambients typical of factory floors.
Recommended
Recommended Products Summary
Engineering reference data for NAFE71388B40BS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | NAFE71388B40BSE | NAFE71388B40BSMP | NAFE11388B40BS | NAFE11348B40BS |
|---|---|---|---|---|---|
| Package | 64-HVQFN (9x9 mm) | 64-HVQFN (9x9 mm) - same | 64-HVQFN (9x9 mm) - same | 64-HVQFN (9x9 mm) - same | 64-HVQFN (9x9 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Input Channels | 8 universal, ±25 V | 8 universal, ±25 V | 8 universal, ±25 V | 8 universal, ±25 V | 8 universal, ±25 V |
| ADC Resolution | 24 bit (delta-sigma) | 24 bit | 24 bit | 24 bit | 16 bit |
| HV Input Protection | Internal diode protection (EMC/miswiring) | Internal diode protection | Internal diode protection | Internal diode protection | Internal diode protection |
| Lifecycle Status | Active | Active | Active | Active | Active |
Key Differentiators
- 24-bit conversion for maximum measurement precision (vs NAFE11348B40BS)
- Integrated ±25 V HV mux with diode-protected inputs (vs NAFE11388B40BS)
- Distributor-stocked identical-die variants for fast supply (vs NAFE71388B40BSMP)
Design Notes
The 64-HVQFN (9x9 mm) package requires a well-designed exposed-pad land pattern: define the center thermal pad footprint per the NXP datasheet landing pattern with an array of vias (typically 5x5 or similar) to the ground plane for heat spreading and a low-inductance return. Because the HV universal inputs sit near ±25 V rails, maintain adequate creepage/clearance between input traces and lower-voltage SPI/digital routing, and place the input protection scheme (series resistance where field wiring demands it) close to the connector side rather than at the IC pins.
The NAFE71388B40BS dissipates approximately 135 mW, so thermal management is straightforward in the 9x9 mm HVQFN with a solid ground pour; an estimated junction rise of only a few degrees C above ambient is expected at typical theta-JA values for this package class. However, supply quality directly affects the 24-bit converter: provide a clean, low-noise analog rail (an LDO such as the TLE42662 family is a good companion) and follow the datasheet decoupling network exactly, with bulk plus high-frequency ceramic capacitors at each supply and reference pin. Never share the analog supply with switching loads.
Do not assume all NAFE family ordering codes are interchangeable: the suffix letters encode temperature grade and packing, and the numeric prefix encodes the supply-class and resolution variant (NAFE71388 vs NAFE11388 vs NAFE11348). Confirm the ordering-code decoder in the NXP datasheet before purchasing a substitute suffix. Also remember that ±25 V is the mux input rating - signals above that require external division, and although inputs are diode-protected, continuous currents into the protection diodes must be kept within datasheet limits for EMC/miswiring events.
Compliance Information
RoHS compliance per NXP product page environmental quality data (Environmental section, nxp.com/part/NAFE71388B40BS). REACH, halogen-free, and conflict-minerals status: confirm on the NXP product page environmental documents.
