The ADM3202 is a 3.3 V-powered RS-232 line transceiver from Analog Devices with two drivers (transmitters) and two receivers - the standard complement for a TX/RX serial port plus one handshake line. Its purpose is to translate between a system's 3.3 V/5 V logic and the bipolar ±5 V-class signaling that the RS-232 (EIA/TIA-232, V.28) standard requires on a cable. ADM3202ARUZ-REEL7 is the RoHS-compliant ("Z") 16-lead TSSOP version on tape and reel.

The key to running RS-232 from a single low-voltage rail is the on-chip charge pump. The ADM3202 uses two external flying capacitors (C1, C2) and two reservoir capacitors - four 0.1 µF capacitors in total - to double and invert the 3.3 V supply, producing the positive (V+) and negative (V-) rails the drivers need to swing a compliant RS-232 output. The designer adds only those four capacitors; no negative supply or extra rail is needed. The part sustains data rates to 460 kbps, comfortably covering standard and high-speed serial.

Robustness and power round it out. The RS-232 pins (driver outputs and receiver inputs) are protected to ±15 kV ESD (air-gap, IEC 1000-4-2), so the connector-facing side tolerates the handling a cable port sees. Typical supply current is about 1.1 mA. Unlike the ADM3222, the ADM3202 has no shutdown pin - it is the straightforward "always-on" two-channel transceiver - in a small 16-lead TSSOP.

Note: Values are taken from the Analog Devices ADM3202 datasheet. Confirm every parameter against the latest official documentation before committing a design.

ADM3202ARUZ-REEL7 is supplied in the 16-lead TSSOP (Thin Shrink Small Outline Package, ADI outline RU-16), a compact low-profile surface-mount body. "Z" marks the RoHS-compliant lead-free finish and "REEL7" the tape-and-reel packing. The same ADM3202 die is also offered in SOIC (R-16), SSOP and PDIP. The four external charge-pump capacitors (0.1 µF) should be placed close to the C1+/C1-/C2+/C2- and V+/V- pins to keep the generated rails clean; route the RS-232 driver/receiver pins toward the connector. Package dimensions and pin-1 orientation are shown below.

📄 Full specifications are detailed in the official Analog Devices ADM3202 datasheet.

The 16-lead package groups the charge-pump capacitor pins, the generated rails, the logic side and the RS-232 side:

• C1+, C1-, C2+, C2- (pins 1, 3, 4, 5): External charge-pump (flying) capacitor connections, 0.1 µF.
• V+ (pin 2): Charge-pump positive output (reservoir cap to GND).
• V- (pin 6): Charge-pump negative output (reservoir cap to GND).
• T1IN, T2IN (pins 11, 10): Driver (transmitter) logic inputs, TTL/CMOS.
• T1OUT, T2OUT (pins 14, 7): Driver RS-232 outputs (to connector).
• R1IN, R2IN (pins 13, 8): Receiver RS-232 inputs (from connector).
• R1OUT, R2OUT (pins 12, 9): Receiver logic outputs, TTL/CMOS.
• VCC (pin 16) / GND (pin 15): Supply (3.0-5.5 V) and ground.

Refer to the package drawing below for the physical pin numbering of the 16-lead TSSOP.

The parts below are related ADI RS-232 transceivers, available in our catalog. They are not all drop-in replacements; verify channels, shutdown, supply and pinout before substituting.

Selection Tips: Stay with the ADM3202 for a simple 3.3 V 2-channel RS-232 port. Choose the ADM3222 when a shutdown/low-power mode is needed, ADM3232 for enhanced ESD, ADM232A for a classic 5 V design, or the ADM3251 when galvanic isolation between the port and the system is required.

Analog Devices, Inc. (ADI), headquartered in Wilmington, Massachusetts, USA, is a global leader in high-performance analog, mixed-signal and RF semiconductors, with a long-established line of interface and RS-232/RS-485 transceivers. The ADM3202 belongs to ADI's 3 V RS-232 family, combining an integrated charge pump with ESD-protected line pins for low-voltage serial interfaces.

ADI backs the ADM3202 with full datasheet characterization and application guidance on charge-pump capacitor selection, layout and ESD handling - the details that determine reliable RS-232 levels and connector robustness in the field.