SN75C188N from Texas Instruments, in a PDIP-14. 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	VCC-	power_in	Negative supply terminal; recommended range is -4.5 V to -15 V, and an external series diode is needed for protection under power-off fault conditions.
2	1A	input	Driver 1 input (non-inverting, Y = A) that is CMOS/TTL compatible with VIH minimum 2 V and VIL maximum 0.8 V.
3	1Y	output	Driver 1 RS-232 line output, current-limited at about 10 mA typical, with output voltage range VCC- - 6 V to VCC+ + 6 V.
4	2A	input	Driver 2 input for the NAND function Y = AB, CMOS/TTL compatible with VIH minimum 2 V and VIL maximum 0.8 V.
5	2B	input	Driver 2 second input for the NAND function Y = AB, CMOS/TTL compatible with VIH minimum 2 V and VIL maximum 0.8 V.
6	2Y	output	Driver 2 RS-232 line output, current-limited at about 10 mA typical, with output voltage range VCC- - 6 V to VCC+ + 6 V.
7	GND	power_in	Network ground terminal; all voltage values are referenced to this terminal.
8	3Y	output	Driver 3 RS-232 line output, current-limited at about 10 mA typical, with output voltage range VCC- - 6 V to VCC+ + 6 V.
9	3A	input	Driver 3 input for the NAND function Y = AB, CMOS/TTL compatible with VIH minimum 2 V and VIL maximum 0.8 V.
10	3B	input	Driver 3 second input for the NAND function Y = AB, CMOS/TTL compatible with VIH minimum 2 V and VIL maximum 0.8 V.
11	4Y	output	Driver 4 RS-232 line output, current-limited at about 10 mA typical, with output voltage range VCC- - 6 V to VCC+ + 6 V.
12	4A	input	Driver 4 input for the NAND function Y = AB, CMOS/TTL compatible with VIH minimum 2 V and VIL maximum 0.8 V.
13	4B	input	Driver 4 second input for the NAND function Y = AB, CMOS/TTL compatible with VIH minimum 2 V and VIL maximum 0.8 V.
14	VCC+	power_in	Positive supply terminal; recommended range is 4.5 V to 15 V.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	PDIP-14
Category	Interface ICs
Pins	14

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply voltage VCC+ (recommended)	VCC+	4.5	12	15	V		3
Supply voltage VCC- (recommended), printed MIN/NOM/MAX cells	VCC-	-4.5	-12	-15	V		3
High-level input voltage	VIH	2			V		3
Low-level input voltage	VIL			0.8	V		3
Operating free-air temperature	TA	0		70	°C		3
Supply voltage VCC+ (absolute maximum)	VCC+			15	V	All voltage values with respect to network ground terminal (Note 1)	3
Supply voltage VCC- (absolute maximum)	VCC-	-15			V	All voltage values with respect to network ground terminal (Note 1)	3
Storage temperature range	Tstg	-65		150	°C		3
Lead temperature				260	°C	1,6 mm (1/16 inch) from case for 10 seconds	3
Continuous total power dissipation, N package				1150	mW	N package, TA ≤ 25°C	3
Derating factor above TA = 25°C, N package			9.2		mW/°C	N package, above TA = 25°C	3
Power rating at TA = 70°C, N package				736	mW	N package, TA = 70°C	3
High-level output voltage (±5 V supplies)	VOH	4			V	VCC+ = 5 V, VCC- = -5 V, VIL = 0.8 V, RL = 3 kΩ	4
High-level output voltage (±12 V supplies)	VOH	10			V	VCC+ = 12 V, VCC- = -12 V, VIL = 0.8 V, RL = 3 kΩ	4
Low-level output voltage (±5 V supplies)	VOL			-4	V	VCC+ = 5 V, VCC- = -5 V, VIH = 2 V, RL = 3 kΩ (see Note 2)	4
Low-level output voltage (±12 V supplies)	VOL			-10	V	VCC+ = 12 V, VCC- = -12 V, VIH = 2 V, RL = 3 kΩ (see Note 2)	4
High-level input current	IIH			10	µA	VI = 5 V	4
Low-level input current	IIL			-10	µA	VI = 0	4
High-level short-circuit output current (negative sign line)	IOS(H)	-5.5	-10	-19.5	mA	VI = 0.8 V, VO = 0 or VCC-	4
Low-level short-circuit output current	IOS(L)	5.5	10	19.5	mA	VI = 2 V, VO = 0 or VCC+	4
Output resistance, power off	rO	300			Ω	VCC+ = 0, VCC- = 0, VI = -2 V to 2 V	4
Supply current from VCC+ (±5 V)	ICC+		90	160	µA	VCC+ = 5 V, VCC- = -5 V, all inputs at 2 V or 0.8 V, no load	4
Supply current from VCC+ (±12 V)	ICC+		95	160	µA	VCC+ = 12 V, VCC- = -12 V, all inputs at 2 V or 0.8 V, no load	4
Supply current from VCC- (±5 V)	ICC-		-90	-160	µA	VCC+ = 5 V, VCC- = -5 V, all inputs at 2 V or 0.8 V, no load	4
Supply current from VCC- (±12 V)	ICC-		-95	-160	µA	VCC+ = 12 V, VCC- = -12 V, all inputs at 2 V or 0.8 V, no load	4
Propagation delay time, low- to high-level output	tPLH			3	µs	RL = 3 kΩ, CL = 15 pF, See Figure 1	4
Propagation delay time, high- to low-level output	tPHL			3.5	µs	RL = 3 kΩ, CL = 15 pF, See Figure 1	4
Transition time, low- to high-level output (10% to 90%)	tTLH		0.53	3.2	µs		4
Transition time, high- to low-level output (10% to 90%)	tTHL		0.53	3.2	µs		4
Transition time, low- to high-level output (3 V to -3 V)	tTLH			1.5	µs	RL = 3 kΩ to 7 kΩ, CL = 2500 pF	4
Transition time, high- to low-level output (3 V to -3 V)	tTHL			1.5	µs	RL = 3 kΩ to 7 kΩ, CL = 2500 pF	4
Output slew rate	SR	6	15	30	V/µs	RL = 3 kΩ to 7 kΩ, CL = 15 pF	4

CAD (KiCad official)

Symbol: SN75C188N
Footprint: Package_DIP:DIP-14_W7.62mm
3D model: PDIP-14 (KiCad packages3D, STEP)
3D model files: sn75c188n-etched.step / sn75c188n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn75c188n.step / sn75c188n.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (19 pp, sha256 25e666607f367cdc, 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).

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SN75C188N

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