NAFE33352B40BS - 24-bit Universal AIO-AFE | NXP Semiconductors
MPN: NAFE33352B40BS ✓ Active| Qty | Unit Price | Extended |
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NAFE33352B40BS Overview
An analog front-end (AFE) is the circuit block that conditions and converts real-world analog signals - voltages, currents, and resistances from sensors and actuators - into digital data and back again, sitting between raw field signals and a processor in industrial measurement and control systems. Within the power and signal-chain hierarchy, the AFE occupies the layer above the ADC and DAC themselves, integrating conversion, referencing, amplification, and multiplexing into a single programmable device.
Key features include two universal analog input channels plus one combined analog input/output channel, a 24-bit ADC for high-precision measurement, an integrated precision DAC for signal generation, and a readback path (Vsense, Isense) that measures voltage and current output. An LVMUX connection allows the ADC to digitize external and internal signals for condition monitoring. The combination of current output and voltage input enables resistance and temperature measurement using RTD or thermistor sensors.
The NAFE33352 is the low-power member of the NAFEx3352 family; the NAFE93352 is the high-speed version. Its architecture pairs the precision DAC, low-drift reference, and high-voltage amplifier to generate both small and wide output signals, meeting industrial-grade accuracy requirements without multiple discrete components.
Typical applications include programmable logic controllers (PLCs), process control systems, I/O modules, and data loggers, where universal analog channels must be reconfigured in software for voltage, current, or resistive sensor interfaces.
When designing with this device, configure channel modes through its software interface early in the project, since the universal input structure replaces several fixed-function ICs and layout decisions (grounding, HV routing) should reflect the full configured operating range.
This page synthesizes verified distributor listings, drop-in alternative analysis, and practical design guidance not found in the manufacturer datasheet.
Drop-in alternatives for NAFE33352B40BS — 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 NAFE33352B40BS (same form factor and footprint) — differing in Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
NAFE93352B40BS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$7.9 / Unit
View Datasheet →NAFE33350
✅ Drop-In📋 Reference alternative (not in catalog)
NAFE33352B40BS Maximum Ratings & Electrical Characteristics
| Product Type | Software-configurable universal AIO analog front-end (AFE) |
| ADC Resolution | 24 bit |
| DAC Resolution Options | 14 / 16 / 18 bit (integrated precision DAC) |
| Analog Input Channels | 2 universal input channels |
| Analog Input/Output Channel | 1 combined AIO channel |
| Voltage Reference | Integrated low-drift voltage reference |
| Buffers | Low-offset drift buffers |
| Output Amplifier | Integrated high-voltage amplifier |
| Readback Path | Vsense and Isense voltage/current output readback |
| Condition Monitoring | LVMUX connection to ADC for external/internal signal digitization |
| Sensor Support | RTD and thermistor (resistance/temperature measurement) |
| Family Position | NAFE33352 = low-power version; NAFE93352 = high-speed version |
| Package | 40-HVQFN (6x6 mm) |
| Mounting Type | Surface Mount |
| Target Applications | PLC, process control, I/O modules, data loggers |
NAFE33352B40BS 40-hvqfn (6x6 mm) Pin Configuration Guide
Pin configuration for NAFE33352B40BS (40-hvqfn (6x6 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 NAFE33352B40BS.
Refer to the datasheet for full pin configuration.
Typical Applications
NAFE33352B40BS is suitable for 6 applications: Programmable Logic Controllers (PLC), Process Control Systems, Industrial I/O Modules, Data Loggers, RTD and Thermistor Temperature Measurement, Condition Monitoring Systems.
Programmable Logic Controllers (PLC)
The NAFE33352 fits PLC analog I/O cards because its software-configurable universal channels replace multiple fixed-function conditioning ICs. Its 24-bit ADC provides the resolution margin industrial measurement demands, while the integrated 14/16/18-bit DAC and high-voltage amplifier generate control outputs across small and wide signal ranges. Because channel behavior is configured in software, one analog module design can serve voltage, current, and RTD/thermistor input types selected at commissioning. The Vsense/Isense readback path lets the PLC's processor verify output integrity continuously, improving diagnostics coverage. Placing the AFE close to the field connector with short high-voltage traces minimizes noise pickup, and the integrated low-drift reference removes a separate precision-reference component from the analog card BOM.
Recommended
Process Control Systems
In process control, the NAFE33352's combination of 24-bit measurement and precise signal generation suits closed-loop control of temperature, pressure, and flow variables. The low-drift voltage reference and low-offset drift buffers maintain accuracy over long periods between calibration cycles, which is critical in continuous process environments. Its current output capability drives standard current-loop actuators while the voltage input channels read transmitters, and the RTD/thermistor support covers direct temperature sensing without additional excitation circuitry. The LVMUX condition-monitoring path lets the same device track loop health signals, supporting predictive maintenance in the control system. For high-speed process loops requiring faster scanning, NXP's NAFE93352 high-speed family member is the designated upgrade path within the same architecture.
Recommended
Industrial I/O Modules
Universal I/O modules benefit directly from the NAFE33352's architecture: two universal input channels plus one combined analog input/output channel let a single footprint support mixed-channel configurations (e.g., 3 voltage inputs plus 1 current output) without hardware changes. The 24-bit ADC digitizes low-level sensor signals with adequate headroom for industrial accuracy classes, and the integrated high-voltage amplifier produces wider output ranges required by actuators. Software configuration means the same PCB supports multiple SKU variants, reducing inventory complexity for module vendors. The Vsense/Isense readback provides per-channel diagnostics needed for module-level health reporting in Industry 4.0 deployments, and the 40-HVQFN (6x6 mm) package keeps channel density high on standard module form factors.
Recommended
Data Loggers
The NAFE33352 is the low-power member of the NAFEx3352 family, making it appropriate for battery-powered and low-power data loggers that must run for months on limited energy. Its 24-bit ADC captures slow-moving process signals with high resolution, and the two universal inputs plus AIO channel cover the typical logger channel mix of sensor inputs and an occasional excitation or control output. RTD and thermistor support enables temperature logging using the device's own current output and voltage input combination, eliminating external excitation circuitry and its associated quiescent draw. The LVMUX condition-monitoring input can also record supply or diagnostic signals. Where logging requires faster scan rates, the NAFE93352 high-speed variant is the in-family alternative at the cost of higher power consumption.
Recommended
RTD and Thermistor Temperature Measurement
The NAFE33352 measures resistance and temperature using RTD or thermistor sensors by combining its current output with its voltage input: the DAC-driven current excites the sensor, and the 24-bit ADC digitizes the resulting voltage, from which resistance is computed. This integrated approach removes the discrete excitation current source, instrumentation amplifier, and separate ADC that a traditional RTD front-end requires, cutting component count and error-budget terms. The low-drift voltage reference directly limits gain-error drift in the resistance calculation, and the Vsense/Isense readback verifies excitation accuracy in-situ. In multi-channel temperature modules, the software-configurable channel structure lets one board support 2-wire, 3-wire, and thermistor input types selected at configuration time, simplifying product variants.
Recommended
Condition Monitoring Systems
The NAFE33352 supports condition-monitoring functions through its LVMUX connection to the ADC, which digitizes both external and internal signals for diagnostics. In industrial monitoring nodes, this allows the same AFE performing routine analog I/O to also track equipment health signals - supply rails, internal reference levels, or external monitor points - without a second data-acquisition device. The 24-bit resolution captures small signal drifts early, and the Vsense/Isense readback path confirms that command outputs are actually being delivered, detecting wiring faults or actuator degradation. Because the NAFE33352 is the low-power family member, it suits continuously powered monitoring nodes, while the NAFE93352 serves high-speed vibration-oriented monitoring where sample rate dominates power considerations.
Recommended
Recommended Products Summary
Engineering reference data for NAFE33352B40BS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | NAFE93352B40BS | NAFE33350 |
|---|---|---|---|
| Package | 40-HVQFN (6x6 mm) | 40-HVQFN (6x6 mm) - same | 40-HVQFN (6x6 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| DAC Resolution | 14/16/18 bit | 14/16/18 bit | 14/16/18 bit (output-focused) |
| Family Position | Low-power version | High-speed version | Analog output AFE |
| Target Applications | PLC, process control, I/O modules, data loggers | High-speed industrial measurement and control | High-precision analog output control |
Key Differentiators
- Low-power position in the NAFEx3352 family (vs NAFE93352B40BS)
- Combined input and output on one AIO channel (vs NAFE33350)
- Integrated RTD/thermistor measurement path (vs NAFE93352B40BS)
Design Notes
The NAFE33352 integrates a high-voltage amplifier driving the AIO channel, so layout must respect creepage and clearance between HV output traces and low-level ADC/reference nodes on the 6x6 mm HVQFN footprint. Route analog sense lines (Vsense, Isense) as Kelvin connections directly to the output node to preserve readback accuracy. Use a solid ground plane under the analog section and separate it from digital switching returns, rejoining at a single point near the supply. Decouple the analog supply and reference pins with 100 nF ceramics placed within 2 mm of the respective HVQFN pads.
Because channels are software-configurable at runtime, design the input protection and filtering network for the worst-case configured mode - including the highest voltage range and current-output mode - rather than a single fixed function. Add series resistance and clamping on field terminals to survive miswiring on universal inputs, and remember the LVMUX path can bring external signals into the ADC, so those mux inputs deserve the same ESD and filtering treatment as primary field channels.
A common mistake is treating the NAFE33352 like a conventional fixed-function ADC+DAC pair: its universal channel modes must be configured through the device's command interface before measurements are valid, and RTD measurement depends on correctly pairing the DAC current output with the ADC voltage input in firmware. Also avoid substituting the NAFE93352 without review - it is the high-speed version, not a power-identical swap. Validate the configuration sequence against the NAFE33352-EVB reference software before finalizing firmware.
Compliance Information
Compliance status not stated in the provided verified web data; consult the official NXP product page for NAFE33352B40BS for RoHS/REACH declarations.
