MAX232EIN from Texas Instruments, in a PDIP-16. 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	C1+	passive	Positive lead of the C1 charge-pump capacitor, which is connected between C1+ and C1− (1-µF capacitors are specified).
2	VS+	power_out	Positive charge-pump output for the storage capacitor only, and it must not be used to supply external loads.
3	C1−	passive	Negative lead of the C1 charge-pump capacitor.
4	C2+	passive	Positive lead of the C2 charge-pump capacitor.
5	C2−	passive	Negative lead of the C2 charge-pump capacitor.
6	VS−	power_out	Negative charge-pump output for the storage capacitor only, with an absolute maximum of −15 V.
7	DOUT2	output	RS-232 line data output to the remote RS-232 system, with unlimited short-circuit duration per the absolute maximum ratings.
8	RIN2	input	RS-232 line data input from the remote RS-232 system, accepting receiver input voltages of ±3 V to ±30 V.
9	ROUT2	output	Logic data output to the UART, with a high-level output voltage of at least 3.5 V at IOH = −1 mA.
10	DIN2	input	Logic data input from the UART, with a high-level input of at least 2 V and a low-level input of at most 0.8 V.
11	DIN1	input	Logic data input from the UART, with a high-level input of at least 2 V and a low-level input of at most 0.8 V.
12	ROUT1	output	Logic data output to the UART, with a high-level output voltage of at least 3.5 V at IOH = −1 mA.
13	RIN1	input	RS-232 line data input from the remote RS-232 system, accepting receiver input voltages of ±3 V to ±30 V.
14	DOUT1	output	RS-232 line data output to the remote RS-232 system, with unlimited short-circuit duration per the absolute maximum ratings.
15	GND	power_in	Ground reference for the device; all voltages are referenced to network GND.
16	VCC	power_in	Supply voltage, to be connected to an external 5-V supply, with a recommended range of 4.5 V to 5.5 V.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	PDIP-16
Category	Communication Interface Chip/UART/485/232
Pins	16

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Input supply voltage	VCC	-0.3		6	V		4
Supply voltage	VCC	4.5	5	5.5	V		4
Operating free-air temperature	TA	-40		85	°C	MAX232EI	4
High-level input voltage (DIN1, DIN2)	VIH	2			V		4
Low-level input voltage (DIN1, DIN2)	VIL			0.8	V		4
Receiver input voltage (RIN1, RIN2)		-3		30	V		4
Receiver input voltage	VI	-30		30	V	Receiver	4
Input voltage	VI	-0.3			V	Driver	4
Output voltage	VO	-0.3			V	ROUT	4
Positive output supply voltage	VS+			15	V		4
Negative output supply voltage	VS-	-15		-0.3	V		4
Operating virtual junction temperature	TJ			150	°C		4
Storage temperature	Tstg	-65		150	°C		4
Supply current	ICC		8	10	mA	VCC = 5.5 V; all outputs open; TA = 25°C	5
High-level output voltage	VOH	5		7	V	DOUT RL = 3 kΩ to GND	5
Low-level output voltage	VOL	-7		-5	V	DOUT RL = 3 kΩ to GND	5
Output resistance	ro	300			Ω	DOUT VS+ = VS- = 0, VO = ±2 V	5
Short-circuit output current	IOS	-10		10	mA	DOUT VCC = 5.5 V, VO = 0	5
Short-circuit input current	IIS			200	µA	DIN VI = 0	5
High-level output voltage (receiver)	VOH	3.5			V	ROUT IOH = -1 mA	5
Low-level output voltage (receiver)	VOL			0.4	V	ROUT IOL = 3.2 mA	5
Receiver positive-going input threshold voltage	VIT+	1.7		2.4	V	RIN VCC = 5 V TA = 25°C	5
Receiver negative-going input threshold voltage	VIT-	0.8		1.2	V	RIN VCC = 5 V TA = 25°C	5
Input hysteresis voltage	Vhys	0.2	0.5	1	V	RIN VCC = 5 V	5
Receiver input resistance	ri	3	5	7	kΩ	RIN VCC = 5 V TA = 25°C	5
Driver slew rate	SR	30			V/µs	RL = 3 kΩ to 7 kΩ, see Figure 6	5
Driver transition region slew rate	SR(t)	3			V/µs	RL = 3 kΩ, CL = 2.5 nF, see Figure 7	5
Data rate				250	kbit/s	One DOUT switching	5
Receiver propagation delay time, low- to high-level output	tPLH(R)		500		ns	CL = 50 pF	6
Receiver propagation delay time, high- to low-level output	tPHL(R)		500		ns	CL = 50 pF	6
Junction-to-ambient thermal resistance (PDIP N)	RθJA		43.3		°C/W	PDIP (N), 16 pins; C1-C4 = 1 µF at VCC = 5 V ± 0.5 V	4
Junction-to-case (top) thermal resistance (PDIP N)	RθJC(top)		30		°C/W	PDIP (N), 16 pins; C1-C4 = 1 µF at VCC = 5 V ± 0.5 V	4
Junction-to-board thermal resistance (PDIP N)	RθJB		23.3		°C/W	PDIP (N), 16 pins; C1-C4 = 1 µF at VCC = 5 V ± 0.5 V	4
Junction-to-top characterization parameter (PDIP N)	ψJT		14.4		°C/W	PDIP (N), 16 pins; C1-C4 = 1 µF at VCC = 5 V ± 0.5 V	5
Junction-to-board characterization parameter (PDIP N)	ψJB		23.2		°C/W	PDIP (N), 16 pins; C1-C4 = 1 µF at VCC = 5 V ± 0.5 V	5

CAD (KiCad official)

Symbol: MAX232EIN
Footprint: Package_DIP:DIP-16_W7.62mm
3D model: PDIP-16 (KiCad packages3D, STEP)
3D model files: max232ein-etched.step / max232ein-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max232ein.step / max232ein.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (29 pp, sha256 7ee3b1dfb9f109b4, retrieved 2026-10-30, tier: manufacturer)
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

MAX232EIN

Verified MAX232EIN

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README