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MAX232DR

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by Ray

Texas Instruments RS232 ICs, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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MAX232DR

Texas Instruments · RS232 ICs · SOIC-16

MAX232DR from Texas Instruments, in a SOIC-16. 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 C1+ passive Positive lead of the C1 charge-pump flying capacitor (1µF). Used with C1- to double VCC to VS+.
2 VS+ power_out Positive charge-pump output (typ +8.5V) for storage capacitor only (1µF to GND). Internal RS-232 driver supply rail.
3 C1- passive Negative lead of the C1 charge-pump flying capacitor (1µF).
4 C2+ passive Positive lead of the C2 charge-pump flying capacitor (1µF). Used to invert VS+ to produce VS-.
5 C2- passive Negative lead of the C2 charge-pump flying capacitor (1µF).
6 VS- power_out Negative charge-pump output (typ -8.5V) for storage capacitor only (1µF to GND). Internal RS-232 driver negative supply rail.
7 T2OUT output Driver 2 RS-232 line data output (to remote RS-232 system). Swings between VS- and VS+ (typ ±7V into 3kΩ load).
8 R2IN input Receiver 2 RS-232 line data input (from remote RS-232 system). Tolerates ±30V; input resistance 3-7 kΩ; thresholds VIT+ ≤2.4V, VIT- ≥0.8V.
9 R2OUT output Receiver 2 logic data output (to UART/CMOS/TTL). VOH ≥3.5V @ -1mA, VOL ≤0.4V @ 3.2mA. Goes high on open R2IN.
10 T2IN input Driver 2 logic data input (from UART/CMOS/TTL). VIH ≥2V, VIL ≤0.8V; internal pull-up ensures a high input when line is high-impedance.
11 T1IN input Driver 1 logic data input (from UART/CMOS/TTL). VIH ≥2V, VIL ≤0.8V; internal pull-up ensures a high input when line is high-impedance.
12 R1OUT output Receiver 1 logic data output (to UART/CMOS/TTL). VOH ≥3.5V @ -1mA, VOL ≤0.4V @ 3.2mA. Goes high on open R1IN.
13 R1IN input Receiver 1 RS-232 line data input (from remote RS-232 system). Tolerates ±30V; input resistance 3-7 kΩ; thresholds VIT+ ≤2.4V, VIT- ≥0.8V.
14 T1OUT output Driver 1 RS-232 line data output (to remote RS-232 system). Swings between VS- and VS+ (typ ±7V into 3kΩ load).
15 GND power_in Device ground / common return. All voltages are referenced to this pin.
16 VCC power_in Supply voltage input, 4.5-5.5V (nom 5V). Bypass with 1µF to GND. Typical ICC = 8mA (10mA max).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-16
Category Interface
Pins 16

Ordering variants

Same part, different packaging or reel option.

  • MAX232DRD
  • MAX232DR
  • MAX232DRDW
  • MAX232DRDWR
  • MAX232DRN
  • MAX232DRNS
  • MAX232DRNSR

CAD (KiCad official)

  • Symbol: MAX232DR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Texas Instruments datasheet (27 pp, sha256 47d45fefa0db5981, retrieved 2026-08-17, tier: manufacturer)
  • 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