HY2122 EB1A from HYCON Tech, in a SOT-23-6. 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	OD	output	Discharge-control MOSFET gate drive output. Drives the gate of the external N-MOSFET (M1) that controls the discharge current path; pulled low (V_DL ≤ 0.5V) to disable discharging when overdischarge or discharge overcurrent is detected, otherwise driven high (VDD-0.1V min).
2	OC	output	Charge-control MOSFET gate drive output. Drives the gate of the external N-MOSFET (M2) that controls the charge current path; pulled low (V_CL ≤ 0.5V) to disable charging when overcharge or charge overcurrent is detected, otherwise driven high (VDD-0.1V min). High-voltage tolerant (absolute max VDD-33 to VDD+0.3 V).
3	CS	input	Overcurrent-sense input and charger-detection terminal. Monitors the voltage across the external discharge/charge MOSFETs to detect discharge overcurrent (V_DIP=200mV), charge overcurrent (V_CIP=-200mV), and load short-circuit (V_SIP=1.0V typ.). High-voltage design tolerates VDD-33 to VDD+0.3 V so it can survive a reversed charger connection; typically connected to PB- through R3 (2kΩ).
4	VC	input	Middle-cell tap: connects to the negative terminal of battery 1 and the positive terminal of battery 2. Used by the internal detectors to monitor each cell voltage individually; typically connected through a 330Ω series resistor (R2) with a 0.1µF decoupling cap (C2) to VSS.
5	VDD	power_in	Positive supply input; connects to the positive terminal of battery 1 (pack +). VDD-VSS operating range 1.5V to 10V (absolute max VSS-0.3 to VSS+10V). Typically fed through a 330Ω series resistor (R1) with a 0.1µF decoupling cap (C1) to VSS.
6	VSS	power_in	Ground / negative supply input; connects to the negative terminal of battery 2 (bottom cell −). Serves as the reference for all internal detectors and MOSFET gate drivers.

Key specifications

Parameter	Value
Manufacturer	HYCON Tech
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

HY2122 EB1A
HY2122 EB1AAB1A
HY2122 EB1AAB1B
HY2122 EB1ABB1A

CAD (KiCad official)

Symbol: HY2122 EB1A
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HYCON Tech datasheet (20 pp, sha256 c26f84e2ed2575c5, retrieved 2026-08-17, 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: 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