ADM3202ARNZ-REEL7 - 3.3V RS-232 2/2 Transceiver 460kbps | ADI
MPN: ADM3202ARNZ-REEL7 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.12 | $4.12 |
| 10 | $3.72 | $37.20 |
| 100 | $3.31 | $331.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.63 | $2,630.00 |
ADM3202ARNZ-REEL7 Overview
An RS-232 transceiver is an interface IC that converts logic-level UART signals (TTL/CMOS, typically 0 V to 3.3 V) to the higher voltage swings defined by the EIA-232E and ITU V.28 standards, and vice versa. Within the signal-chain hierarchy, it belongs to the interface IC family alongside RS-485, CAN and USB transceivers, and sits between a microcontroller UART and a physical D-sub serial port. Because RS-232 rails can swing to +/-5 V or more, an integrated charge pump (voltage doubler and inverter) is required when only a single low-voltage supply is available.
Key features of the ADM3202 include guaranteed 460 kbps operation for high-speed serial links, operation from a 3 V to 5.5 V supply range per distributor parametric data, EIA-232E/V.28 conformance, and a small external capacitor requirement of only 4 x 0.1 uF, which reduces board area and BOM cost. The complementary ADM3222/ADM1385 family members add a low-power shutdown facility for battery-powered portable instruments.
Technically, the device uses CMOS charge-pump technology with integrated driver and receiver channels. The charge doubler generates V+ and the inverter generates V- from the 3.3 V rail, enabling true RS-232 output levels without a dual supply. Receivers incorporate hysteresis and tolerate input voltages up to +/-30 V, improving noise immunity on long cables.
Typical applications include industrial point-of-sale equipment, networking and communication equipment serial management ports, embedded systems console/debug ports, and battery-powered portable instruments with RS-232 connectivity.
Design considerations: place the four 0.1 uF charge pump capacitors as close as possible to pins 1-6, and use at least 0.1 uF of supply decoupling on VCC; note the ADM3202 itself lacks the shutdown pin available on the ADM3222 variant.
This page synthesizes distributor availability, drop-in alternatives, pinout detail and design notes beyond what a single datasheet provides.
Drop-in alternatives for ADM3202ARNZ-REEL7 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ADM3202ARNZ
β Drop-Inπ Reference alternative (not in catalog)
ADM3202ARN-REEL7
β Drop-Inπ Reference alternative (not in catalog)
ADM3232EARNZ-REEL7
β Drop-Inπ Reference alternative (not in catalog)
ADM3222ARW
β Drop-Inπ Reference alternative (not in catalog)
MAX3232MPWREP
β Drop-Inπ Reference alternative (not in catalog)
ADM3202ARNZ-REEL7 Specifications
| Function | RS-232 line transceiver (driver/receiver) |
| Number of Drivers / Receivers | 2 / 2 |
| Protocol | RS-232 / V.28 |
| Duplex | Full |
| Data Rate | 460 kbps |
| Supply Voltage | 3 V to 5.5 V |
| Nominal Supply | 3.3 V (single supply) |
| Charge Pump Capacitors | 4 x 0.1 uF external |
| Standard Conformance | EIA-232E / ITU V.28 |
| Package | 16-SOIC (0.154 in, 3.90 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (REEL7) |
| RoHS Status | Compliant (Z suffix, green product) |
| Shutdown Feature | Not on ADM3202 (available on ADM3222/ADM1385) |
ADM3202ARNZ-REEL7 Pin Configuration
| Pin 1 | C1+ β Charge pump capacitor 1 positive terminal (external 0.1 uF) |
| Pin 2 | V+ β Charge pump positive rail output (doubler), decouple with 0.1 uF |
| Pin 3 | C1- β Charge pump capacitor 1 negative terminal |
| Pin 4 | C2+ β Charge pump capacitor 2 positive terminal (external 0.1 uF) |
| Pin 5 | C2- β Charge pump capacitor 2 negative terminal |
| Pin 6 | V- β Charge pump negative rail output (inverter), decouple with 0.1 uF |
| Pin 7 | T2OUT β RS-232 driver 2 output |
| Pin 8 | R2IN β RS-232 receiver 2 input (+/-30 V tolerant) |
| Pin 9 | R2OUT β Receiver 2 logic-level output (TTL/CMOS) |
| Pin 10 | T2IN β Driver 2 logic-level input (TTL/CMOS) |
| Pin 11 | T1IN β Driver 1 logic-level input (TTL/CMOS) |
| Pin 12 | R1OUT β Receiver 1 logic-level output (TTL/CMOS) |
| Pin 13 | R1IN β RS-232 receiver 1 input (+/-30 V tolerant) |
| Pin 14 | T1OUT β RS-232 driver 1 output |
| Pin 15 | GND β Ground |
| Pin 16 | VCC β Supply input, 3 V to 5.5 V, decouple with 0.1 uF |
Typical Applications
ADM3202ARNZ-REEL7 is suitable for 6 applications: Embedded Console / Debug UART Ports, Industrial Point-of-Sale and Receipt Printers, Networking and Communication Equipment Management, Battery-Powered Portable Instruments, Medical and Laboratory Device Serial Interfaces, Legacy Equipment Retrofit and Repair.
Embedded Console / Debug UART Ports
Embedded systems, single-board computers and network appliances frequently expose an RS-232 console port for out-of-band management and firmware debugging. The ADM3202ARNZ-REEL7 fits this role because it converts the 3.3 V MCU UART (TTL/CMOS levels on T1IN/R1OUT) to EIA-232E-compliant levels at up to 460 kbps, comfortably above the 115.2 kbps console default. Its single 3.3 V supply means no extra rails are generated, and the four 0.1 uF charge pump capacitors keep the area around the DB9 connector small. Place the IC near the connector with short TOUT lines; the receiver's +/-30 V input tolerance protects against cable transients. Full duplex operation lets the console receive and transmit simultaneously without turnaround logic.
Recommended
Industrial Point-of-Sale and Receipt Printers
Point-of-sale terminals, receipt printers and barcode scanners still use RS-232 serial links for host communication because the standard is electrically robust over the 1-15 m cable runs typical in retail. The ADM3202ARNZ-REEL7 suits this application with guaranteed 460 kbps throughput for high-speed data transfer, operation from the single 3.3 V rail common in modern embedded POS logic boards, and EIA-232E/V.28 conformance that guarantees interoperability with legacy host equipment. The charge pump needs only 0.1 uF capacitors, reducing cost in high-volume products. Its narrow 16-SOIC body fits dense POS mainboards, and RoHS-compliant green packaging meets retail-market environmental requirements without exceptions.
Recommended
Networking and Communication Equipment Management
Switches, routers, base stations and telecom power plants provide RS-232 craft ports for provisioning and diagnostics. The ADM3202ARNZ-REEL7 addresses this use: its 460 kbps rate supports fast log dumps and firmware updates over the serial craft interface, while the single 3.3 V supply integrates directly into telecom board power trees derived from 3.3 V logic. The receiver tolerates +/-30 V input swings, providing margin against ground potential differences across racked equipment. Because the transceiver is always active (no shutdown pin), it keeps the craft port live even when the chassis is in a reduced-power state - which is exactly the requirement for out-of-band management access before the OS boots.
Recommended
Battery-Powered Portable Instruments
Portable measurement instruments - handheld meters, dataloggers, environmental monitors - often need an RS-232 link to legacy PCs and field configurators. Analog Devices explicitly targets the ADM3202 family at battery-powered portable instruments thanks to low power consumption from a single 3.3 V battery-derived rail. The ADM3202ARNZ-REEL7 draws minimal static current while keeping the receiver active to detect incomingε€ι transmissions. Designers who need a true standby state should use the pin-similar ADM3222/ADM1385 with the shutdown facility, which cuts supply current dramatically when the port is idle. The 0.1 uF charge pump design also minimizes capacitor size and inrush on battery connection.
Recommended
Medical and Laboratory Device Serial Interfaces
Laboratory instruments, infusion pumps and diagnostic analyzers frequently retain RS-232 as the communication interface to hospital information systems and service tools, per long-standing device interoperability conventions. The ADM3202ARNZ-REEL7 provides the required EIA-232E/V.28 signaling from the 3.3 V rails typical of modern medical electronics, with 460 kbps capability for fast waveform or results upload. Full-duplex 2-driver/2-receiver channels support simultaneous command and status streams. RoHS-compliant green packaging simplifies regulatory documentation. Designers should add series protection and follow creepage/clearance rules at the patient-isolation boundary; the transceiver itself belongs on the non-isolated instrument side of any isolation barrier.
Recommended
Legacy Equipment Retrofit and Repair
Maintaining factory automation controllers, CNC machines and test fixtures built around RS-232 requires continued availability of standard transceivers. The ADM3202ARNZ-REEL7 is an active Analog Devices part, making it a safe replacement for obsolete 3.3 V RS-232 transceivers in repair work: it uses the industry-standard SOIC-16 pinout shared with MAX232/MAX3232-class devices, so it often drops onto existing footprints designed for those parts. The 3 V to 5.5 V supply range per distributor data lets one repair stock item cover both 3.3 V and 5 V logic boards. The 460 kbps rating preserves original link speeds, and the 0.1 uF capacitor requirement matches the common values already fitted on legacy boards.
Recommended
Recommended Products Summary
Engineering reference data for ADM3202ARNZ-REEL7 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADM3202ARNZ | ADM3202ARN-REEL7 | ADM3232EARNZ-REEL7 | ADM3222ARW | MAX3232MPWREP |
|---|---|---|---|---|---|---|
| Package | 16-SOIC (3.90 mm width) | 16-SOIC (3.90 mm) - same | 16-SOIC (3.90 mm) - same | 16-SOIC (3.90 mm) - same | 16-SOIC (7.50 mm wide body) - different footprint | TSSOP-16 - different footprint |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 1 / 1 | 2 / 2 |
| Supply Voltage | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3.3 V nominal | 3.0 V to 5.5 V |
| Charge Pump Capacitors | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF |
| Shutdown Pin | No | No | No | No | Yes | Yes (EN/ENIN force-off class) |
| ESD Protection | Standard (per datasheet) | Standard | Standard | Enhanced ESD protection | Standard | Enhanced (EPP automotive-rated) |
| Packaging (Supply Format) | Tape & Reel (REEL7) | Tube / tray | Tape & Reel | Tape & Reel | Tube | Tape & Reel |
Key Differentiators
- 460 kbps data rate (vs MAX3232MPWREP)
- No shutdown pin (always-on operation) (vs ADM3222ARW)
- Same-footprint upgrade path with enhanced ESD (vs ADM3232EARNZ-REEL7)
- Single 3.3 V supply with only 0.1 uF capacitors (vs Legacy MAX232 transceivers)
Design Notes
Place the four 0.1 uF charge pump capacitors (C1 between pins 1-3, C2 between pins 4-5) and the V+ / V- reservoir capacitors (pins 2 and 6 to GND) within a few millimeters of the IC, using short, direct traces. Long charge pump traces add series inductance that increases ripple on the generated rails and can radiate into nearby analog circuitry. Add a 0.1 uF decoupling capacitor directly at VCC pin 16. A solid ground plane under the transceiver area improves return-current paths for the switching charge pump.
The internal charge pump switches continuously, producing small broadband energy on V+ and V-. Keep the RS-232 driver output traces (pins 7 and 14) reasonably short and route them away from sensitive analog nodes and reset lines. If the serial cable is long or runs through a noisy environment, the enhanced-ESD ADM3232EARNZ-REEL7 in the same footprint offers additional robustness on the exposed transceiver lines. Ferrite beads on V+ / V- are rarely needed at these low data rates but can help in mixed-signal designs with nearby sensitive front ends.
Two frequent mistakes: first, confusing the narrow 3.90 mm SOIC-16 footprint of the ADM3202ARNZ-REEL7 with the wide 7.50 mm SOIC used by the ADM3222ARW - they are not interchangeable on the same land pattern, so verify the footprint before release. Second, the ADM3202 has no shutdown/enabling pin, unlike the ADM3222/ADM1385; designs requiring a standby state must select the ADM3222 variant. Also remember the receiver inputs tolerate up to +/-30 V, but sustained incorrect polarity wiring on TOUT lines into RIN can still damage the part - check cable pinout before first power-up.
Compliance Information
Z suffix denotes Analog Devices green/RoHS-compliant packaging; FindIC comparison data describes the family as a green product with no Sb/Br. REACH and conflict-minerals declarations not present in provided data - obtain from Analog Devices.
