MAX3225EAP+T from Maxim Integrated, in a SSOP-20-208mil. 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	READY	output	Ready to Transmit output, active high; READY is driven high when V- goes below -4V and the device is ready to transmit, and is driven low in shutdown.
2	C1+	passive	Positive terminal of the voltage-doubler charge-pump capacitor C1.
3	V+	power_out	+5.5V generated by the charge pump; charge-pump output that is pulled to VCC in shutdown.
4	C1-	passive	Negative terminal of the voltage-doubler charge-pump capacitor C1.
5	C2+	passive	Positive terminal of the inverting charge-pump capacitor C2.
6	C2-	passive	Negative terminal of the inverting charge-pump capacitor C2.
7	V-	power_out	-5.5V generated by the charge pump; the transmitters are enabled only when the magnitude of V- exceeds approximately -3V.
8	T2OUT	output	RS-232 transmitter 2 output, guaranteed at least ±5V with a 3kΩ load and high impedance when the transmitters are disabled.
9	R2IN	input	RS-232 receiver 2 input, with an input voltage range of -25V to +25V.
10	R2OUT	output	TTL/CMOS receiver 2 output (inverting), active in all operating modes.
11	INVALID	output	Valid signal detector output, active low; a logic-high indicates a valid RS-232 level is present on a receiver input, independent of FORCEON and FORCEOFF.
12	T2IN	input	TTL/CMOS transmitter 2 input; it has no pull-up, so unused inputs must be connected to GND or VCC.
13	T1IN	input	TTL/CMOS transmitter 1 input; it has no pull-up, so unused inputs must be connected to GND or VCC.
14	FORCEON	input	Force-On input, active high; drive high to override AutoShutdown Plus and keep transmitters and receivers on, provided FORCEOFF is high.
15	R1OUT	output	TTL/CMOS receiver 1 output (inverting), active in all operating modes.
16	R1IN	input	RS-232 receiver 1 input, with an input voltage range of -25V to +25V.
17	T1OUT	output	RS-232 transmitter 1 output, guaranteed at least ±5V with a 3kΩ load and high impedance when the transmitters are disabled.
18	GND	power_in	Ground reference for the device.
19	VCC	power_in	+3.0V to +5.5V single supply voltage.
20	FORCEOFF	input	Force-Off input, active low; drive low to shut down transmitters, receivers, and the charge pump, overriding AutoShutdown Plus and FORCEON.

Key specifications

Parameter	Value
Manufacturer	Maxim Integrated
Package	SSOP-20-208mil
Category	Interface ICs
Pins	20

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	3		5.5	V	VCC = +3V to +5.5V (test-conditions header)	2
Operating temperature range (E grade)	TA	-40		85	°C	MAX32_ E _	2
VCC to GND	VCC	-0.3		6	V		2
V+ to GND	V+	-0.3		7	V	Note 1	2
V- to GND	V-	-7		0.3	V	Note 1	2
V+ + /V-/				13	V	Note 1	2
Input voltage T_IN, FORCEON, FORCEOFF to GND		-0.3		6	V		2
Receiver input R_IN to GND	R_IN	-25		25	V		2
Transmitter output T_OUT to GND	T_OUT	-13.2		13.2	V		2
Output voltage R_OUT, INVALID, READY to GND		-0.3			V	Upper limit printed as VCC + 0.3V	2
Storage temperature range	TSTG	-65		160	°C		2
Lead temperature (soldering, 10 s)				300	°C	10 s soldering	2
Soldering temperature (reflow)				260	°C	Reflow	2
Input Threshold High			1.8	2.4	V	VCC = 5.0V; T_IN, FORCEON, FORCEOFF; TA = +25°C	2
Input Threshold High			1.5	2.4	V	VCC = 3.3V; T_IN, FORCEON, FORCEOFF; TA = +25°C	2
Input Threshold Low			0.8	1.5	V	VCC = 5.0V; T_IN, FORCEON, FORCEOFF; TA = +25°C	2
Input Threshold Low			0.6	1.2	V	VCC = 3.3V; T_IN, FORCEON, FORCEOFF; TA = +25°C	2
Input Logic Threshold High		2.4			V		2
Input Logic Threshold Low				0.8	V		2
Input Voltage Range (receiver inputs)		-25		25	V		2
Output Voltage Low (R_OUT)	VOL			0.4	V	IOUT = 1.6mA	2
Supply Current, Shutdown	ICC		1	10	µA	FORCEOFF = GND; TA = +25°C	2
Supply Current, AutoShutdown Plus	ICC		1	10	µA	FORCEON = GND, FORCEOFF = VCC, all R_IN idle, all T_IN idle; TA = +25°C	2
Supply Current, AutoShutdown Plus Disabled	ICC		0.3	1	mA	FORCEON = FORCEOFF = VCC, no load	2
Output Resistance (transmitter, powered off)	ROUT	300			Ω	VCC = V+ = V- = 0, transmitter outputs = ±2V	3
Output Voltage Swing	VO	-5	5.4		V	All transmitter outputs loaded with 3kΩ to ground	3
Output Leakage Current (transmitters disabled)		-25		25	µA	VCC = 0 or 3V to 5.5V, VOUT = ±12V, transmitters disabled	3
Output Short-Circuit Current	IOS	-60		60	mA		3
Receiver input threshold to INVALID output low		-0.3		0.3	V	Figure 4a	3
Receiver input threshold to INVALID output high		-2.7		2.7	V	Figure 4a	3
INVALID, READY Output Voltage Low				0.4	V		3
Maximum data rate (VCC 4.5 V to 5.5 V)		1000			kbps	VCC = 4.5V to 5.5V, RL = 3kΩ, CL = 1000pF, one transmitter switching	4
Maximum data rate (VCC 3.0 V to 4.5 V)		250			kbps	VCC = 3.0V to 4.5V, RL = 3kΩ, CL = 250pF, one transmitter switching	4
Transition-region slew rate		24		150	V/µs	VCC = 3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V	4
Receiver output enable time				200	ns		4
Receiver output disable time				200	ns		4
Receiver skew /tPHL - tPLH/				50	ns		4
Transmitter skew /tPHL - tPLH/				25	ns		4

CAD (KiCad official)

Symbol: MAX3225EAP+T
Footprint: Package_SO:SSOP-20_5.3x7.2mm_P0.65mm
3D model: SSOP-20-208mil (KiCad packages3D, STEP)
3D model files: max3225eap-t-etched.step / max3225eap-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max3225eap-t.step / max3225eap-t.glb are the bare package body.

Provenance

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

Datasheet: Maxim Integrated datasheet (19 pp, sha256 cb52c14514f7e6c3, retrieved 2026-10-31, 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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MAX3225EAP+T

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