NAFE33352 - 24-bit Low-Power AIO Analog Front End | NXP
MPN: NAFE33352B40BS β Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
NAFE33352B40BS Overview
An analog front end (AFE) is the analog signal-conditioning stage that sits between real-world sensors and actuators and a digital controller. Within the industrial signal chain hierarchy, the AFE belongs to data conversion and signal conditioning ICs, bridging transducers, programmable logic controllers (PLCs), and process-control systems. AFEs integrate ADC, DAC, reference, and amplification functions to reduce board area and improve measurement accuracy compared with discrete solutions.
Key features of the NAFE33352 include one analog input/output channel and two universal input channels, a 24-bit ADC for high-precision measurement, an integrated low-drift voltage reference and low-offset drift buffers, and a readback path (Vsense, Isense) to measure voltage and current output. The NAFE33352 is the low-power version of the NAFEx3352 family, while the NAFE93352 is the high-speed version.
Technically, the device integrates a high-precision DAC, low-drift voltage reference, and a precise high-voltage amplifier to generate both small and wide output signals. An LVMUX connection to the ADC allows digitization of external and internal signals for condition monitoring. Combining current output with voltage input enables resistance and temperature measurement using RTD sensors or thermistors, eliminating external circuitry in many industrial I/O designs.
Typical applications include programmable logic controllers (PLC), process control, I/O modules, and data loggers, where universal analog input channels must accept voltage, current, and RTD signals within one footprint.
A key design consideration: as the low-power family member, verify conversion-rate requirements against the NAFE93352 high-speed variant before finalizing the design; both share the same system architecture and software configuration model.
This page synthesizes verified distributor and manufacturer data, drop-in alternatives, pricing tiers, and practical design notes not found in the NXP datasheet alone.
Drop-in alternatives for NAFE33352B40BS β 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) β differing in Package, Product Type.
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NAFE33351B40BS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
NAFE33350B40BS
β Drop-Inπ Reference alternative (not in catalog)
NAFE93352B40BS
β Drop-Inβ In Stock
$7.9 / Unit
View Datasheet βNAFE33352B40BS Maximum Ratings & Electrical Characteristics
| Product Type | Software-configurable universal AIO analog front end (AFE) |
| ADC Resolution | 24 bit |
| DAC Resolution (family) | 14/16/18 bit options |
| Analog Input/Output Channels | 1 AIO channel + 2 universal input channels |
| Voltage Reference | Integrated low-drift voltage reference |
| Buffers | Low-offset drift buffers |
| Output Amplifier | Precise high-voltage amplifier |
| Readback Path | Vsense and Isense voltage/current output measurement |
| Condition Monitoring | LVMUX connection to ADC for internal/external signal digitization |
| Sensor Support | RTD and thermistor measurement (via current output + voltage input) |
| Power Class | Low-power version (NAFE93352 is 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, 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 accept the 0-10 V, +/-10 V, and 0/4-20 mA signal standards common on industrial sensors and actuators without hardware changes. The 24-bit ADC provides the resolution headroom that PLC vendors need for 16-bit-class measurement accuracy after calibration, while the integrated low-drift voltage reference and low-offset drift buffers remove the external reference and amplifier stages that a discrete ADC design would require. On the output side, the precise high-voltage amplifier generates wide-swing setpoint signals directly, and the Vsense/Isense readback path enables loop diagnostics such as wire-break detection on 4-20 mA outputs. The low-power operating profile keeps thermal load manageable inside sealed PLC enclosures, where every channel IC contributes to the module's total dissipation budget.
Recommended
Process Control
Process control loops demand precise, stable measurement of pressure, flow, and temperature transmitters over long cable runs. The NAFE33352 addresses this with its 24-bit ADC, low-drift reference, and LVMUX-based condition monitoring, which lets the system periodically digitize internal and external diagnostic signals without a separate monitoring ADC. Because the device combines current output with voltage input, it can measure loop resistance directly - useful for verifying transmitter wiring health. The high-voltage output amplifier drives wide-range control signals to final control elements, and the readback path confirms the actual delivered output, closing the loop on actuation accuracy. As the low-power member of the NAFEx3352 family, it suits continuously powered control cabinets, while the high-speed NAFE93352 covers faster scan-rate loops within the same software framework.
Recommended
Industrial I/O Modules
Universal analog I/O modules must mix voltage, current, and RTD inputs on one board. The NAFE33352's one AIO channel plus two universal input channels are software-configurable, so a single PCB design covers multiple channel types, cutting inventory and qualification cost. RTD and thermistor measurement is achieved by sourcing current from the device output and reading the resulting voltage with the 24-bit ADC - no external excitation circuitry is needed. The integrated precision DAC family (14/16/18-bit options) and high-voltage amplifier also handle the module's analog outputs. Low-offset drift buffers preserve accuracy over industrial temperature ranges, and Vsense/Isense readback supports per-channel diagnostics required by modern module health monitoring. This integration typically replaces a multi-chip front end of mux, PGA, ADC, DAC, and reference.
Recommended
Data Loggers
Battery-backed and low-power data loggers benefit directly from the NAFE33352's position as the low-power version of the NAFEx3352 family. Its 24-bit ADC captures small sensor signals - thermocouple-, RTD-, and thermistor-derived voltages - with the resolution needed for sub-degree temperature logging, while the integrated reference removes warm-up and drift issues associated with external references that dominate logger error budgets. The universal input channels allow one logger hardware platform to accept many sensor types via software configuration, and the LVMUX enables periodic self-diagnostics such as supply and reference monitoring. Where faster sampling is required, designs can move to the pin-compatible high-speed NAFE93352 without re-architecting the logger board, preserving firmware investment across product speed tiers.
Recommended
RTD and Thermistor Temperature Measurement
The NAFE33352 measures temperature with RTDs and thermistors by exploiting its combined current output and voltage input architecture: the device sources an excitation current, and the 24-bit ADC digitizes the voltage across the sensing element to compute resistance and temperature. According to NXP documentation, this combination is explicitly supported, and the low-offset drift buffers plus low-drift reference limit the error terms that normally plague ratiometric temperature measurement. Because excitation, digitization, and reference are integrated, designers avoid discrete current-source and amplifier stages, and the Vsense/Isense readback enables open- and short-circuit sensor diagnostics expected in industrial temperature modules. The software-configurable channels let the same silicon support 2-, 3-, and 4-wire input schemes depending on the module's channel card design.
Recommended
Condition Monitoring Systems
Condition monitoring nodes sample slow-moving process variables and equipment health indicators. The NAFE33352's LVMUX connection to the ADC is purpose-built here: internal nodes and external auxiliary signals can be routed to the 24-bit ADC for periodic digitization, letting one IC monitor reference health, supply levels, and external sensors without adding a dedicated monitoring channel. The low-power profile suits always-on monitoring hardware, and the Vsense/Isense readback verifies that any commanded excitation or output actually reached the sensor, distinguishing real signals from wiring faults. For retrofit loggers and smart sensors, the software-configurable universal inputs accommodate heterogeneous sensor fleets. Where vibration or high-frequency condition data is required, the high-speed NAFE93352 variant provides the same package and software model with faster sampling.
Recommended
Recommended Products Summary
Engineering reference data for NAFE33352B40BS β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | NAFE33351B40BS | NAFE33350B40BS | NAFE93352B40BS |
|---|---|---|---|---|
| Package | 40-HVQFN (6x6 mm) | 40-HVQFN (6x6 mm) - same | 40-HVQFN (6x6 mm) - same | 40-HVQFN (6x6 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Function | Universal AIO-AFE (input + output) | Universal AIO-AFE | Analog output AFE only | Universal AIO-AFE (high speed) |
Key Differentiators
- True input + output integration in one IC (vs NAFE33350B40BS)
- Low-power operation at full precision (vs NAFE93352B40BS)
- Integrated RTD/thermistor measurement (vs NAFE33350B40BS)
Design Notes
The NAFE33352 uses a 40-pin HVQFN (6x6 mm) package with an exposed pad. Solder the exposed pad to a grounded copper pour with an array of thermal vias - this pad is typically the main ground return for the analog front end and is critical for noise performance of the 24-bit ADC. Place the low-drift reference decoupling and ADC input RC filters close to the pins, and keep the high-voltage output amplifier routing away from high-impedance input traces to prevent crosstalk into precision measurements.
Do not assume channel behavior from other AFE families - the NAFE33352 channels are software-configurable and must be initialized for the intended mode (voltage in, current out, RTD, etc.) before measurement is valid. When measuring RTDs or thermistors, use the integrated current output with the voltage input path as documented, and account for excitation current accuracy in your temperature error budget. Also confirm whether your scan-rate requirement fits the low-power NAFE33352 or demands the high-speed NAFE93352 before locking the BOM.
Use the Vsense/Isense readback path for closed-loop output verification and wire-break detection on 4-20 mA loops: a readback current near zero with a nonzero command indicates an open loop. Schedule readback and LVMUX diagnostic measurements between normal conversion cycles so condition monitoring does not disturb measurement timing. Keep sensor excitation leads and RTD sense lines as Kelvin connections to preserve the 24-bit ADC's effective resolution at the sensing element.
Compliance Information
Compliance data not present in the provided web data; consult the NXP NAFE33352B40BS product page for current RoHS/REACH status.
