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MAX3237CAI+

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Maxim Integrated Pre-ordered Chips, SSOP-28-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentinterface icsmax3237cai+factory-2.0.0extractor-text

Verified MAX3237CAI+

by Ray · last 30 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier mfr, 28 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: MAX3237CAI+ · SSOP-28-208mil · 28 pins
  • ✓copper: 28 copper pads, none touching another net
  • ✓datasheet: all 28 pin names found in the 17-page datasheet
  • ✓distributor: lcsc C1544158, digikey MAX3237CAI+-ND, mouser 700-MAX3237CAI
  • ✓family: SSOP-28_5.3x10.2mm_P0.65mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-witfzkn9/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 28 pins = 28 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 28 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ max3237cai.kicad_sym✓ max3237cai.kicad_mod✓ max3237cai.step
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs max3237cai: hero re-rendered with the chip (after the 10-30 render outage) · Ray 10d ago
viewers max3237cai: viewers · Ray 10d ago
max3237cai-etched.glb Publish 0.1.0 · Ray 10d ago
max3237cai-etched.step max3237cai: factory component page (tier=mfr) · Ray 10d ago
max3237cai-hero.glb max3237cai: hero GLB from the etched model (keeps the MPN mark) · Ray 10d ago
max3237cai-hero.overlay.json Publish 0.1.0 · Ray 10d ago
max3237cai.glb Publish 0.1.0 · Ray 10d ago
max3237cai.kicad_mod Publish 0.1.0 · Ray 10d ago
max3237cai.kicad_sym Publish 0.1.0 · Ray 10d ago
max3237cai.lbr Publish 0.1.0 · Ray 10d ago
max3237cai.step Publish 0.1.0 · Ray 10d ago
package.json Publish 0.1.0 · Ray 10d ago
page.json Set visibility: public · Ray 10d ago
README.md Publish 0.1.0 · Ray 10d ago
verification.json Verified: Published by the parts factory: tier mfr, 28 pins · Ray 10d ago

MAX3237CAI+

Maxim Integrated · Pre-ordered Chips · SSOP-28-208mil

MAX3237CAI+ from Maxim Integrated, 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 inverting charge-pump capacitor C2, which the datasheet specifies as 0.22µF to 1.0µF for the 3.0V to 5.5V range.
2 GND power_in Ground reference for the device.
3 C2- passive Negative terminal of the inverting charge-pump capacitor C2.
4 V- power_out Generated -5.5V charge-pump output that is pulled to ground when the device is shut down.
5 T1OUT output RS-232 transmitter 1 output, guaranteed at least ±5.0V into a 3kΩ load to ground and high-impedance in shutdown.
6 T2OUT output RS-232 transmitter 2 output, guaranteed at least ±5.0V into a 3kΩ load to ground and high-impedance in shutdown.
7 T3OUT output RS-232 transmitter 3 output, guaranteed at least ±5.0V into a 3kΩ load to ground and high-impedance in shutdown.
8 R1IN input RS-232 receiver 1 input, rated for a voltage range of ±25V.
9 R2IN input RS-232 receiver 2 input, rated for a voltage range of ±25V.
10 T4OUT output RS-232 transmitter 4 output, guaranteed at least ±5.0V into a 3kΩ load to ground and high-impedance in shutdown.
11 R3IN input RS-232 receiver 3 input, rated for a voltage range of ±25V.
12 T5OUT output RS-232 transmitter 5 output, guaranteed at least ±5.0V into a 3kΩ load to ground and high-impedance in shutdown.
13 EN input Receiver enable, active low; when high the inverting R_OUT outputs are put into high-impedance, and it has no effect on T_OUT.
14 SHDN input Shutdown control, active low; in shutdown the charge pumps are off, transmitter outputs are high-impedance and supply current is 1.0µA typical (10µA max) with SHDN = GND.
15 MBAUD input MegaBaud control input; connect to GND for normal 250kbps operation or to VCC for 1Mbps transmission rates.
16 R1OUTB output Noninverting complementary receiver 1 output that is always active, regardless of the state of EN or SHDN.
17 T5IN input TTL/CMOS transmitter 5 input with logic thresholds of 0.8V low and 2.0V to 2.4V high, and no internal pullup, so unused inputs must be tied to GND or VCC.
18 R3OUT output Inverting TTL/CMOS receiver 3 output that goes high-impedance when EN is high.
19 T4IN input TTL/CMOS transmitter 4 input with logic thresholds of 0.8V low and 2.0V to 2.4V high, and no internal pullup, so unused inputs must be tied to GND or VCC.
20 R2OUT output Inverting TTL/CMOS receiver 2 output that goes high-impedance when EN is high.
21 R1OUT output Inverting TTL/CMOS receiver 1 output that goes high-impedance when EN is high.
22 T3IN input TTL/CMOS transmitter 3 input with logic thresholds of 0.8V low and 2.0V to 2.4V high, and no internal pullup, so unused inputs must be tied to GND or VCC.
23 T2IN input TTL/CMOS transmitter 2 input with logic thresholds of 0.8V low and 2.0V to 2.4V high, and no internal pullup, so unused inputs must be tied to GND or VCC.
24 T1IN input TTL/CMOS transmitter 1 input with logic thresholds of 0.8V low and 2.0V to 2.4V high, and no internal pullup, so unused inputs must be tied to GND or VCC.
25 C1- passive Negative terminal of the voltage-doubler charge-pump capacitor C1.
26 VCC power_in Supply voltage of +3.0V to +5.5V (absolute maximum +6V).
27 V+ power_out Generated +5.5V charge-pump output that is pulled down to VCC when the device is shut down.
28 C1+ passive Positive terminal of the voltage-doubler charge-pump capacitor C1.

Key specifications

Parameter Value
Manufacturer Maxim Integrated
Package SSOP-28-208mil
Category Interface ICs
Pins 28

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
VCC Power-Supply Current 0.5 2 mA No load, VCC = 3.3V or 5.0V, TA = +25°C 2
Shutdown Supply Current 1 10 µA SHDN = GND, TA = +25°C 2
Input Logic Threshold Low 0.8 V (Note 3) T_IN, EN, SHDN, MBAUD 2
Input Logic Threshold High 2 V VCC = 3.3V (Note 3) 2
Input Logic Threshold High 2.4 V VCC = 5.0V (Note 3) 2
Input Leakage Current -1 0.01 1 µA T_IN, EN, SHDN, MBAUD 2
Output Leakage Current -10 0.05 10 µA Receivers disabled 2
Output Voltage Low 0.4 V IOUT = 1.6mA 2
Receiver Input Voltage Range -25 25 V 2
Input Threshold Low 0.6 1.2 V TA = +25°C, VCC = 3.3V 2
Input Threshold Low 0.8 1.5 V TA = +25°C, VCC = 5.0V 2
Input Threshold High 1.5 2.4 V TA = +25°C, VCC = 3.3V 2
Input Threshold High 1.8 2.4 V TA = +25°C, VCC = 5.0V 2
Input Resistance 3 5 7 kΩ TA = +25°C 3
Output Voltage Swing 5 5.4 V All transmitter outputs loaded with 3kΩ to ground 3
Output Resistance 300 Ω VCC = V+ = V- = 0V, VOUT = ±2V 3
Output Short-Circuit Current 35 60 mA 3
Output Leakage Current (transmitters) -25 25 µA VOUT = ±12V, VCC = 0V or 3V to 5.5V, transmitters disabled 3
Maximum Data Rate 250 kbps RL = 3kΩ, CL = 1000pF, one transmitter switching, MBAUD = GND 4
Maximum Data Rate 1000 kbps VCC = 3.0V to 4.5V, RL = 3kΩ, CL = 250pF, one transmitter switching, MBAUD = VCC 4
Transmitter Skew /tPHL - tPLH/ 100 ns MBAUD = GND 4
Transmitter Skew /tPHL - tPLH/ 25 ns MBAUD = VCC 4
Receiver Skew /tPHL - tPLH/ 50 ns 4
Receiver Output Enable Time 200 ns Normal operation 4
Receiver Output Disable Time 200 ns Normal operation 4
Transition-Region Slew Rate 6 30 V/µs VCC = 3.3V, RL = 3Ω to 7kΩ, +3V to -3V or -3V to +3V, TA = +25°C, one transmitter switching, CL = 150pF to 1000pF, MBAUD = GND 4
Transition-Region Slew Rate 24 150 V/µs VCC = 3.3V, RL = 3Ω to 7kΩ, +3V to -3V or -3V to +3V, TA = +25°C, one transmitter switching, CL = 150pF to 1000pF, MBAUD = VCC 4
Transition-Region Slew Rate 4 30 V/µs VCC = 3.3V, RL = 3Ω to 7kΩ, +3V to -3V or -3V to +3V, TA = +25°C, one transmitter switching, CL = 150pF to 2500pF, MBAUD = GND 4
VCC Supply Voltage (absolute maximum) VCC -0.3 6 V 2
V+ (absolute maximum) V+ -0.3 7 V Note 1 2
V- (absolute maximum) V- -7 0.3 V Note 1 2
V+ + V- (absolute maximum) V+ + V- 13 V Note 1 2
Input Voltage T_IN, SHDN, EN (absolute maximum) -0.3 6 V 2
Receiver Input R_IN (absolute maximum) R_IN -25 25 V 2
Transmitter Output T_OUT (absolute maximum) T_OUT -13.2 13.2 V 2
Storage Temperature Range -65 150 °C 2
Lead Temperature 300 °C Soldering, 10s 2
Supply Voltage (recommended operating) VCC 3 5.5 V Electrical characteristics test range, TA = TMIN to TMAX 2
Operating Temperature Range (MAX32__C__ grade) 0 70 °C C suffix (commercial) 2
Required Minimum Charge-Pump Capacitor C1 C1 0.22 µF VCC = 3.0 to 5.5V, minimum required value 9
Required Minimum Charge-Pump Capacitors C2, C3, C4 C2, C3, C4 1 µF VCC = 3.0 to 5.5V, minimum required value 9
Thermal Resistance Junction-to-Ambient θJA (single layer board) θJA 105 °C/W 28-pin SSOP, package code A28+2, single layer board 16
Thermal Resistance Junction-to-Case θJC (single layer board) θJC 24 °C/W 28-pin SSOP, package code A28+2, single layer board 16
Thermal Resistance Junction-to-Ambient θJA (multi layer board) θJA 67 °C/W 28-pin SSOP, package code A28+2, multi layer board 16
Thermal Resistance Junction-to-Case θJC (multi layer board) θJC 25 °C/W 28-pin SSOP, package code A28+2, multi layer board 16

CAD (KiCad official)

  • Symbol: MAX3237CAI+
  • Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
  • 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
  • 3D model files: max3237cai-etched.step / max3237cai-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max3237cai.step / max3237cai.glb are the bare package body.

Provenance

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

  • Datasheet: Maxim Integrated datasheet (17 pp, sha256 6179886183cdd63b, 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