BL4056C-42ES from BL(Shanghai Belling), in a ESOP-8. 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	TEMP	input	Battery temperature sense input: the NTC divider voltage is compared with internal thresholds VLOW = 45%×VCC and VHIGH = 80%×VCC, charging pauses when VTEMP is outside that window, and tying TEMP to GND disables temperature monitoring; absolute maximum is -0.3 V to 10 V.
2	PROG	bidirectional	Sets the constant-charge current through a resistor to GND (IBAT = 1100 / RPROG, for example 1.1 kΩ gives 1000 mA, ±10%) and monitors the charge current with about 1.0 V on the pin in current mode; absolute limits are -0.3 V to VCC+0.3 V and 1200 µA pin current.
3	GND	power_in	Ground pin; the PROG current-set resistor and the TEMP divider network return to this pin.
4	VCC	power_in	Input supply pin with a specified operating range of 4.2 V to 9.0 V (5 V typical) and absolute range of -6.5 V to 9 V; undervoltage lockout threshold is 3.6 V and adaptive current reduction starts at 4.3 V.
5	BAT	power_out	Charger output to the single Li-ion cell, with a float voltage of 4.2 V for the BL4056C-42ES variant, absolute limits of -4.35 V to 7 V, and a pin current rating of 1200 mA.
6	STDBY	output	Open-drain charge-complete status output that is pulled low when charging is finished, with output low of 0.3 V to 0.6 V at 5 mA and absolute maximum of -0.3 V to 10 V.
7	CHRG	output	Open-drain charging status output that is pulled low while the battery is charging and is high-impedance otherwise, with output low of 0.3 V to 0.6 V at 5 mA and absolute maximum of -0.3 V to 10 V.
8	CE	input	Chip-enable input: driving it low stops charging and places the device in shutdown, with an absolute range of -6.5 V to 10 V.
9	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	BL(Shanghai Belling)
Package	ESOP-8
Category	Power Management ICs
Pins	9

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
输入电源电压 (VCC) - supply voltage	VCC	4.2	5	9	V		3
输入电源电流 - charge mode	ICC		150	500	μA	充电模式，RPROG=1.1K	3
输入电源电流 - standby (charge terminated)	ICC		70	120	μA	待机模式（充电终止）	3
输入电源电流 - shutdown	ICC		70	120	μA	停机模式（RPROG未连，VCC<VBAT，或 VCC<VUV）	3
稳定输出（浮充）电压 - 4.2V version	VFLOAL	4.158	4.2	4.242	V	0℃≤TA≤85℃	3
BAT pin current - current mode	IBAT	450	500	550	mA	电流模式测试 VBAT=4.0V，RPROG=2.2K	3
BAT pin current - current mode	IBAT	950	1000	1060	mA	电流模式测试 VBAT=4.0V，RPROG=1.1K	3
BAT pin current - standby	IBAT	-2		-1	μA	待机模式，VBAT=VFLOAL	3
BAT pin current - shutdown	IBAT	-6		-2	μA	停机模式（RPROG未连）	3
涓流充电电流 - trickle charge current	ITRIKL	200	230	260	mA	VBAT<VTRIKL，RPROG=1.1K	3
涓流充电门限电压 - trickle charge threshold	VTRIKL	2.8	2.9	3	V	RPROG=1.1K，VBAT上升	3
涓流充电迟滞电压 - trickle charge hysteresis	VTRHYS	60	80	100	mV	RPROG=1.1K	3
VCC欠压闭锁迟滞 - UVLO hysteresis	VUVHYS	150	200	300	mV		3
VCC-VBAT闭锁门限电压 - VCC low to high	VASD	60	100	140	mV	VCC从低到高	3
VCC-VBAT闭锁门限电压 - VCC high to low	VASD	5	30	50	mV	VCC从高到低	3
C/10 终止电流门限 - termination current	ITERM	60	70	80	mA	RPROG=2.4K	3
C/10 终止电流门限 - termination current	ITERM	120	130	140	mA	RPROG=1.1K	3
PROG 引脚电压 - PROG pin voltage	VPROG	0.9	1	1.1	V	RPROG=1.1K，电流模式	3
CHRG 引脚输出低电压 - CHRG output low voltage	VCHRG		0.3	0.6	V	CHRG I =5mA	3
STDBY 引脚输出低电平 - STDBY output low voltage	VSTDBY		0.3	0.6	V	STDBY I =5mA	3
TEMP 引脚高端翻转电压 - TEMP high threshold	VTEMP-H	80	82		%VCC		3
TEMP 引脚低端翻转电压 - TEMP low threshold	VTEMP-L	43	45		%VCC		3
再充电电池门限电压 - recharge threshold	ΔVRECHRG	80	110	140	mV	VFLOAT-VRECHRG	3
再充电比较器滤波时间 - recharge comparator filter time	tRECHARGE	0.8	2	4	ms	VBAT高至低	3
终止比较器滤波时间 - termination comparator filter time	tTERM	0.8	2	4	ms	IBAT降至 ICHG/10 以下	3
VIN 反向漏电流 - reverse leakage on VIN	IVIN		10	20	uA	VIN 端反接，VBAT=VFLOAT	3
电池反向漏电流 - reverse leakage on battery	IBAT		2.5	5	mA	电池反接，VIN=5V	3
输入电源电压（VCC）- absolute max	VCC	-6.5		9	V		1
PROG 引脚电压 - absolute max	PROG	-0.3			V	max printed as VCC+0.3V	1
BAT 引脚电压 - absolute max	BAT	-4.35		7	V		1
CHRG 引脚电压 - absolute max	CHRG	-0.3		10	V		1
STDBY 引脚电压 - absolute max	STDBY	-0.3		10	V		1
TEMP 引脚电压 - absolute max	TEMP	-0.3		10	V		1
CE 引脚电压 - absolute max	CE	-6.5		10	V		1
BAT 引脚电流 - absolute max	IBAT			1200	mA		1
PROG 引脚电流 - absolute max	IPROG			1200	uA		1
最大结温 - maximum junction temperature	TJ			145	℃		1
贮存温度范围 - storage temperature	TSTG	-65		125	℃		1
引脚温度（焊接）- lead temperature	TLEAD			260	℃	焊接时间10秒	1
工作环境温度范围 - operating ambient temperature		-40		85	℃		1

CAD (KiCad official)

Symbol: BL4056C-42ES
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: ESOP-8 (KiCad packages3D, STEP)
3D model files: bl4056c-42es-etched.step / bl4056c-42es-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl4056c-42es.step / bl4056c-42es.glb are the bare package body.

Provenance

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

Datasheet: BL(Shanghai Belling) datasheet (12 pp, sha256 a6c827c4c83b84ee, retrieved 2026-11-05, 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF

BL4056C-42ES

Verified BL4056C-42ES

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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