component
NCN8026AMNTXG
Public Unreviewedby Ray
onsemi Interface - Specialized, QFN-24-EP(4x4). Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads on click. Unloads only if this page sits in the background.
PCB Footprint
Open full view ↗Loads on click. Unloads only if this page sits in the background.
Datasheet
Open in new tab ↗Loads on click. Unloads only if this page sits in the background.
README
markdownNCN8026AMNTXG
onsemi · Interface - Specialized · QFN-24-EP(4x4)
NCN8026AMNTXG from onsemi, in a QFN-24-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VSEL0 | input | Card VCC voltage-select bit 0. Combined with VSEL1 selects 5 V, 3 V or 1.8 V (5V/3V mode when VSEL0=Low; 1.8V/3V mode when VSEL0=High; VSEL1 selects between the two levels of the chosen mode). |
| 2 | CS | input | Active-low chip select. When CS is Low the control and signal pins are configured normally; when CS is High, CMDVCC, VSEL0, VSEL1, CLKDIV1, CLKDIV2 and RSTIN are latched, and I/Ouc, AUX1uc, AUX2uc go to high-impedance pull-up. |
| 3 | VDDP | power_in | Regulator power supply (2.7-5.5 V depending on selected CVCC mode). When VDDP falls below ~2.5 V the card pins are disabled. |
| 4 | PRES | input | Active-low card-presence input (card present when PRES=Low) with an ~8 ms built-in debounce timer. Intended for normally-open (NO) smart-card connectors; may be left open when unused. |
| 5 | PRES | input | Active-high card-presence input (card present when PRES=High) with an ~8 ms built-in debounce timer. Intended for normally-closed (NC) smart-card connectors; may be left open when unused. |
| 6 | CI/O | bidirectional | Bidirectional level-shifted I/O to smart-card connector pin C7. Internal ~11 kΩ pull-up to CVCC provides high-impedance idle state for the card I/O line. |
| 7 | CAUX2 | bidirectional | Bidirectional level-shifted auxiliary AUX2 I/O to smart-card connector pin C8. Internal ~11 kΩ pull-up to CVCC provides high-impedance idle state. |
| 8 | CAUX1 | bidirectional | Bidirectional level-shifted auxiliary AUX1 I/O to smart-card connector pin C4. Internal ~11 kΩ pull-up to CVCC provides high-impedance idle state. |
| 9 | CCLK | output | Smart-card clock output (drives card pin C3). Derived from CLKIN through the internal clock divider and level shifter; supports up to 27 MHz. |
| 10 | CRST | output | Smart-card RESET output to card connector pin C2. Level-shifted from the host RSTIN signal to CVCC level. |
| 11 | CVCC | power_out | Programmable card power-supply output (card pin C1). Delivers 1.8 V / 3.0 V / 5.0 V (±5%) at up to 70 mA, programmable via VSEL0/VSEL1. Requires an external distributed ceramic capacitor 80 nF-1.2 µF (ESR < 100 mΩ) between CVCC and CGND. |
| 12 | PORADJ | input | Power-on-reset threshold adjustment input. External resistor divider on VDD sets the VDD UVLO / POR threshold (rising ~1.24 V, falling ~1.19 V typical at PORADJ). Tie to GND when unused. |
| 13 | CMDVCC | input | Active-low command-VCC / activation-enable input. Toggling CMDVCC High→Low with a card present starts the ISO7816 activation sequence; when CMDVCC=High the CVCC output is pulled low and the internal LDO is disabled (unless latched by CS). |
| 14 | RSTIN | input | Host-side reset input, referenced to VDD. Level-shifted internally and driven to the smart card via CRST at the CVCC-programmed voltage. |
| 15 | VDD | power_in | System-controller (host) power supply, 1.6-5.5 V. Sets the host-side logic-level of the level shifters. A 0.1 µF decoupling capacitor is required. When VDD falls below ~1.45 V the card pins are disabled. |
| 16 | GND | power_in | Digital / host-side ground reference. |
| 17 | INT | output | Active-low interrupt request to the host. Asserted on card-presence changes detected via PRES/PRES and on faults (e.g. CVCC overload). Open-drain-like output with an ~50 kΩ pull-up (available with metal-change option). |
| 18 | CLKIN | input | External clock input to the internal clock divider (up to 27 MHz). Divider ratio (1/1, 1/2, 1/4, 1/8) is selected by CLKDIV1/CLKDIV2 and produces CCLK to the card. |
| 19 | I/Ouc | bidirectional | Host-side bidirectional I/O corresponding to card CI/O. Level-translated between the microcontroller (VDD domain) and the smart card (CVCC domain). Built-in ~11 kΩ pull-up provides high-impedance state. |
| 20 | AUX1uc | bidirectional | Host-side bidirectional auxiliary line corresponding to card CAUX1 (C4). Level-translated between the microcontroller (VDD) and the card (CVCC); built-in ~11 kΩ pull-up. |
| 21 | AUX2uc | bidirectional | Host-side bidirectional auxiliary line corresponding to card CAUX2 (C8). Level-translated between the microcontroller (VDD) and the card (CVCC); built-in ~11 kΩ pull-up. |
| 22 | CLKDIV1 | input | Clock-divider select bit 1. Combined with CLKDIV2 programs CCLK = CLKIN divided by 1, 1/2, 1/4 or 1/8 (see clock-division table). |
| 23 | CLKDIV2 | input | Clock-divider select bit 2. Combined with CLKDIV1 programs the CLKIN→CCLK division ratio. |
| 24 | VSEL1 | input | Card VCC voltage-select bit 1. Combined with VSEL0 chooses CVCC = 5 V, 3 V or 1.8 V (VSEL1=High picks the higher level of the mode chosen by VSEL0). |
| 25 | GND | power_in | Exposed thermal pad - regulator (card-side) power-supply ground. Must be soldered to the PCB ground plane for proper electrical operation and thermal dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | QFN-24-EP(4x4) |
| Category | Communication Interface Chip/UART/485/232 |
| Pins | 25 |
Ordering variants
Same part, different packaging or reel option.
NCN8026AMNTXG
CAD (KiCad official)
- Symbol:
NCN8026AMNTXG - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm - 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (15 pp, sha256
c3d6be7a248da33b, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).