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AD5421BREZ-REEL7
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Analog Devices Digital To Analog Converters (DAC), HTSSOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownAD5421BREZ-REEL7
Analog Devices · Digital To Analog Converters (DAC) · HTSSOP-28
AD5421BREZ-REEL7 from Analog Devices, in a HTSSOP-28. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IODVDD | power_in | Digital interface supply pin; the digital thresholds are referenced to the voltage applied here, which may be 1.71 V to 5.5 V relative to COM. |
| 2 | SDO | output | Serial data output used to clock data out of the input shift register; data changes on the SCLK rising edge and is valid on the SCLK falling edge. |
| 3 | SCLK | input | Serial clock input; data is read into the input shift register on the SCLK falling edge, with an operating clock rate of up to 30 MHz. |
| 4 | SYNC | input | Active-low frame synchronization input; data is transferred on SCLK falling edges while SYNC is low, and the shift register data is latched on the SYNC rising edge. |
| 5 | SDIN | input | Serial data input that must be valid on the SCLK falling edge. |
| 6 | LDAC | input | Active-low load DAC input that updates the DAC register and output current; it must not be left floating, and if held permanently low the DAC register updates on the SYNC rising edge. |
| 7 | FAULT | output | Active-high fault alarm output that goes high when a fault is detected (SPI failure, PEC error, loop current out of range, loop voltage low, or over-temperature). |
| 8 | DVDD | power_out | 3.3 V digital supply output that must be decoupled to COM with 100 nF and 4.7 µF capacitors. |
| 9 | ALARM_CURRENT_DIRECTION | input | Selects the alarm current direction: connect to DVDD for upper alarm current (22.8 mA/24 mA) or to COM for lower alarm current (3.2 mA). |
| 10 | RINT/REXT | input | Current-setting resistor select: connect to DVDD to use the internal current-setting resistor, or to COM to use an external resistor. |
| 11 | RANGE0 | input | Digital input that, together with RANGE1, selects the loop current range (connect to COM or DVDD per Table 9). |
| 12 | RANGE1 | input | Digital input that, together with RANGE0, selects the loop current range (connect to COM or DVDD per Table 9). |
| 13 | COM | power_in | Ground reference pin for the AD5421; a 4.7 V Zener is recommended between LOOP- and COM for protection. |
| 14 | COM | power_in | Ground reference pin for the AD5421, internally common with pin 13. |
| 15 | REG_SEL2 | input | Together with REG_SEL1 and REG_SEL0, selects the REGOUT regulator output voltage from 1.8 V to 12 V per Table 10. |
| 16 | REG_SEL1 | input | Together with REG_SEL2 and REG_SEL0, selects the REGOUT regulator output voltage from 1.8 V to 12 V per Table 10. |
| 17 | REG_SEL0 | input | Together with REG_SEL2 and REG_SEL1, selects the REGOUT regulator output voltage from 1.8 V to 12 V per Table 10. |
| 18 | REFIN | input | Reference voltage input; 2.5 V is required for rated performance. |
| 19 | REFOUT2 | output | Internal 1.22 V reference output; a 100 nF capacitor between this pin and COM is recommended. |
| 20 | REFOUT1 | output | Internal 2.5 V reference output; a 100 nF capacitor between this pin and COM is recommended. |
| 21 | CIN | passive | External slew-rate capacitor connection to COM for loop current slew control, and AC-coupled input for the HART FSK signal. |
| 22 | REXT1 | passive | External current-setting resistor connection; a precision 24 kΩ resistor may be connected between REXT1 and REXT2 to improve performance. |
| 23 | REXT2 | passive | External current-setting resistor connection; a precision 24 kΩ resistor may be connected between REXT1 and REXT2 to improve performance. |
| 24 | LOOP- | passive | Loop current connection; the loop current is sensed between COM and LOOP- across the internal 52 Ω resistor, and the voltage at LOOP- is negative with respect to COM. |
| 25 | VLOOP | input | Voltage monitor input accepting 0 V to 2.5 V, digitized to 8 bits for the fault register; a 20:1 divider allows monitoring of loop supply up to 50 V. |
| 26 | DRIVE | output | Gate drive pin for an external depletion-mode MOSFET placed between the loop supply and REGIN. |
| 27 | REGIN | power_in | Regulator input that accepts the loop voltage directly or through an external pass transistor; the rated input is 5.5 V to 52 V relative to LOOP-. |
| 28 | REGOUT | power_out | Regulator output selectable from 1.8 V to 12 V via REG_SEL0-2; decouple to COM with more than 1 µF when driving a microconverter supply. |
| 29 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | HTSSOP-28 |
| Category | Data Acquisition |
| Pins | 29 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Total unadjusted error (TUE) | 0.05 | % | 1 | ||||
| Integral nonlinearity (INL) error | 0.0035 | % FSR | 1 | ||||
| Output temperature coefficient | 3 | ppm/°C | 1 | ||||
| Quiescent current | 300 | µA | 1 | ||||
| On-chip reference temperature coefficient | 4 | ppm/°C | 1 | ||||
| Loop supply voltage range | VLOOP | 5.5 | 52 | V | 1 | ||
| Operating temperature range | -40 | 105 | °C | 1 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | COPPER | POTENTIAL AS THE COM PIN AND TO A COPPER PLANE FOR | 12 |
CAD (KiCad official)
- Symbol:
AD5421BREZ-REEL7 - Footprint:
Package_SO:TSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP2.85x6.7mm - 3D model: HTSSOP-28 (KiCad packages3D, STEP)
- 3D model files:
ad5421brez-reel7-etched.step/ad5421brez-reel7-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ad5421brez-reel7.step/ad5421brez-reel7.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (36 pp, sha256
d9214bebc999aeb6, retrieved 2026-10-19, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).