DRDNB21D-7 from Diodes Incorporated, in a SOT-363. 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	IN1	input	Input to Q1 pre-biased NPN transistor (base through R1=2.2kΩ). Drives channel 1. Vin range -5 to +12V; input current typ 3.6mA at VI=5V; VI(on) max 1.1V for VO=0.3V, IO=5mA.
2	GND	power_in	Common emitter of Q1 and Q2 (ground return for both channels).
3	IN2	input	Input to Q2 pre-biased NPN transistor (base through R3=2.2kΩ). Drives channel 2. Vin range -5 to +12V; input current typ 3.6mA at VI=5V.
4	OUT2	output	Open-collector output of Q2 with D2 anode connected internally. Connect to one side of relay coil 2 (return through VCC). VCEmax 50V; IO max 100mA; VO(on) max 0.3V at IO/IL=50mA/0.25mA.
5	VCC	power_in	Common cathode of D1 and D2 flyback diodes. Connect to relay supply (VCC) so diodes clamp inductive kickback from both relay coils. Diode VRM 100V, IO 250mA.
6	OUT1	output	Open-collector output of Q1 with D1 anode connected internally. Connect to one side of relay coil 1 (return through VCC). VCEmax 50V; IO max 100mA; VO(on) max 0.3V.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOT-363
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

DRDNB21D-7

CAD (KiCad official)

Symbol: DRDNB21D-7
Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
3D model: SOT-363 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`drdnb21d-7.step`	99 KB	You want the bare part, or you mark your own boards.
`drdnb21d-7-etched.step`	1.7 MB	You want the part with `DRDNB21D-7` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 427 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Diodes Incorporated datasheet (8 pp, sha256 a9aafd34a8b09b0c, retrieved 2026-08-17, tier: manufacturer)
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).

Datasheet PDF