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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

TRS3243IDBR

Texas Instruments · RS232 ICs · SSOP-28-208mil

TRS3243IDBR from Texas Instruments, in a SSOP-28-208mil. 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	C2+	passive	Positive terminal of the voltage-doubler charge-pump capacitor, with the capacitor value set per the VCC versus capacitor table (Table 9-1).
2	C2-	passive	Negative terminal of the voltage-doubler charge-pump capacitor, with the capacitor value set per the VCC versus capacitor table (Table 9-1).
3	V-	power_out	Negative charge-pump output voltage; the V- supply is rated to -7 V absolute maximum and the V+ - V- difference to 13 V.
4	RIN1	input	RS-232 receiver input with a recommended input range of -25 V to 25 V and an input resistance of 3 kΩ to 7 kΩ.
5	RIN2	input	RS-232 receiver input with a recommended input range of -25 V to 25 V and an input resistance of 3 kΩ to 7 kΩ; it also feeds the always-active ROUT2B output.
6	RIN3	input	RS-232 receiver input with a recommended input range of -25 V to 25 V and an input resistance of 3 kΩ to 7 kΩ.
7	RIN4	input	RS-232 receiver input with a recommended input range of -25 V to 25 V and an input resistance of 3 kΩ to 7 kΩ.
8	RIN5	input	RS-232 receiver input with a recommended input range of -25 V to 25 V and an input resistance of 3 kΩ to 7 kΩ.
9	DOUT1	output	RS-232 driver output with an absolute output range of -13.2 V to 13.2 V; it is high impedance when the device is powered off.
10	DOUT2	output	RS-232 driver output with an absolute output range of -13.2 V to 13.2 V; it is high impedance when the device is powered off.
11	DOUT3	output	RS-232 driver output with an absolute output range of -13.2 V to 13.2 V; it is high impedance when the device is powered off.
12	DIN3	input	Driver logic input with a 0 V to 5.5 V input range, VIL maximum of 0.8 V, and VIH minimum of 2 V at VCC = 3.3 V or 2.4 V at VCC = 5 V.
13	DIN2	input	Driver logic input with a 0 V to 5.5 V input range, VIL maximum of 0.8 V, and VIH minimum of 2 V at VCC = 3.3 V or 2.4 V at VCC = 5 V.
14	DIN1	input	Driver logic input with a 0 V to 5.5 V input range, VIL maximum of 0.8 V, and VIH minimum of 2 V at VCC = 3.3 V or 2.4 V at VCC = 5 V.
15	ROUT5	output	Receiver logic output that goes high for an open receiver input and is high impedance when the device is powered off.
16	ROUT4	output	Receiver logic output that goes high for an open receiver input and is high impedance when the device is powered off.
17	ROUT3	output	Receiver logic output that goes high for an open receiver input and is high impedance when the device is powered off.
18	ROUT2	output	Receiver logic output that goes high for an open receiver input and is high impedance when the device is powered off.
19	ROUT1	output	Receiver logic output that goes high for an open receiver input and is high impedance when the device is powered off.
20	ROUT2B	output	Always-active noninverting output of the RIN2 input that stays enabled while the device is powered down, allowing ring-indicator data transmission.
21	INVALID	output	Invalid-signal output that is high when any RIN input is a valid RS-232 level (above 2.7 V or below -2.7 V, or within ±0.3 V for less than 30 µs) and low when all RIN inputs are invalid.
22	FORCEOFF	input	Auto power-down control input with a 0 V to 5.5 V range; driving it low powers off all drivers and receivers except ROUT2B and reduces supply current to 1 µA.
23	FORCEON	input	Auto power-down control input with a 0 V to 5.5 V range; driving it high overrides automatic power down and keeps the drivers active.
24	C1-	passive	Negative terminal of the voltage-doubler charge-pump capacitor, with the capacitor value set per the VCC versus capacitor table (Table 9-1).
25	GND	power_in	Ground reference for the device and the RS-232 serial-port connection.
26	VCC	power_in	Supply voltage of 3 V to 5.5 V (6 V absolute maximum).
27	V+	power_out	Positive charge-pump output voltage; absolute maximum rating of 7 V.
28	C1+	passive	Positive terminal of the voltage-doubler charge-pump capacitor, with the capacitor value set per the VCC versus capacitor table (Table 9-1).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SSOP-28-208mil
Category	Interface
Pins	28

CAD (KiCad official)

Symbol: TRS3243IDBR
Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
3D model: SSOP-28-208mil (KiCad packages3D, STEP)
3D model files: trs3243idbr-etched.step / trs3243idbr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); trs3243idbr.step / trs3243idbr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (26 pp, sha256 fe9a6533b614250b, retrieved 2026-10-08, 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