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Analog Devices Inc. ADM3251EARWZ-REEL
- Part No.:
- ADM3251EARWZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM3251EARWZ-REEL.pdf
- Description:
- DGTL ISO 2500VRMS RS232 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,084
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Product details
Overview
ADM3251EARWZ-REEL from Analog Devices is a fully isolated, single-channel RS-232 transceiver integrating isoPower™ DC-DC conversion and iCoupler® digital isolation. It delivers 2.5kV rms isolation (VISO = 2500V rms), supports 460kbps data rates, operates from a single 5V supply, and features ±8kV contact / ±15kV air-gap ESD protection on RIN/TOUT - ideal for industrial diagnostic ports and medical equipment interfacing with noisy RS-232 cables.
For engineers reviewing the ADM3251EARWZ-REEL datasheet, ADM3251EARWZ-REEL pinout, ADM3251EARWZ-REEL application, or ADM3251EARWZ-REEL equivalent, key selection criteria include verified 20-lead SOIC_W package compatibility, confirmed 25kV/μs common-mode transient immunity, validated dual-mode operation (integrated vs. externally powered VISO), and documented compliance with DIN EN IEC 60747-17, UL 1577, and IEC/EN/CSA 62368-1.
Technical Context
The ADM3251EARWZ-REEL implements galvanic isolation for both power and data using chip-scale transformer-based iCoupler® technology on the signal side and an integrated 300MHz isoPower™ DC-DC converter on the primary side. Its dual-stage charge pump generates ±10V RS-232 output swing from 5V input, while Schmitt-trigger receiver inputs with 0.1V hysteresis ensure robust noise immunity.
It supports two operational modes: DC-DC enabled (VCC = 4.5–5.5V) delivering isolated 5V on VISO, or DC-DC disabled (VCC = 3.0–3.7V) requiring external 3.0–5.5V on VISO. Logic-side TIN accepts CMOS/TTL levels; bus-side RIN tolerates −30V to +30V with 5kΩ internal pull-down and ±30V overvoltage protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 2500V rms for 1 minute (UL 1577); 547V peak working voltage (VIORM) per DIN EN IEC 60747-17 - certifies basic insulation for industrial/mains-connected systems. |
| Data Rate | 460kbps maximum (RL = 3kΩ–7kΩ, CL = 50pF–1000pF) - exceeds EIA/TIA-232E requirements for high-speed serial links in diagnostics and control. |
| ESD Protection | ±8kV contact / ±15kV air-gap HBM on RIN and TOUT pins - enables hot-plug resilience in field-deployed medical and industrial equipment. |
| Common-Mode Immunity | >25kV/μs at logic high/low outputs - maintains signal integrity during fast transients in motor drives or PLC backplanes. |
| Supply Configuration | Single 5V input with integrated isoPower; optional external VISO (3.0–5.5V) when DC-DC disabled - eliminates need for separate isolated DC-DC converters. |
| Operating Temperature | −40°C to +85°C industrial range - qualified for embedded use in factory automation and outdoor telecom cabinets. |
| Package | 20-lead wide-body SOIC (SOIC_W, RW-20) with 3.5mm creepage/clearance - meets IEC 60664-1 Pollution Degree 2 requirements. |
Pinout & Package
ADM3251EARWZ-REEL uses a 20-lead wide-body SOIC (SOIC_W, RW-20) package with 1.27mm pitch, 7.5mm body width, and split-paddle thermal construction. Ground pins (GND and GNDISO) are strategically placed for PCB thermal vias and isolation barrier separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connect - must remain unconnected to avoid compromising isolation integrity. |
| 2,3 | VCC | Primary-side 4.5–5.5V supply input; enables internal DC-DC converter - requires 0.1µF decoupling to GND. |
| 4,5,6,7,10 | GND | Logic-side ground reference - critical thermal path; multiple vias to PCB ground plane recommended. |
| 8 | ROUT | CMOS-level receiver output (inverted) referenced to GND - drives microcontroller GPIO directly. |
| 9 | TIN | CMOS/TTL transmitter input referenced to GND - compatible with 3.3V/5V logic without level shifters. |
| 11 | GNDISO | Isolated RS-232 side ground - separates bus-side return from logic ground to maintain galvanic isolation. |
| 12 | V− | Internally generated −10V RS-232 supply - powers negative swing of TOUT; no external connection required. |
| 13,14 | C2−, C2+ | Charge pump capacitor terminals for voltage inversion stage - connect 0.1µF ceramic capacitor between them. |
| 15 | RIN | RS-232 receiver input (−30V to +30V range) referenced to GNDISO - includes 5kΩ pull-down and ±30V fault protection. |
| 16 | TOUT | RS-232 driver output (±5.7V swing into 3kΩ) referenced to GNDISO - compliant with EIA/TIA-232E drive capability. |
| 17,18 | C1−, C1+ | Charge pump capacitor terminals for voltage doubling stage - connect 0.1µF ceramic capacitor between them. |
| 19 | V+ | Internally generated +10V RS-232 supply - powers positive swing of TOUT; no external connection required. |
| 20 | VISO | Isolated secondary-side supply output (5V when DC-DC enabled); input (3.0–5.5V) when DC-DC disabled - requires 0.1µF decoupling to GNDISO. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isoPower DC-DC | Eliminates external isolated power supply - reduces BOM count and board space in compact industrial gateways. |
| iCoupler® digital isolation | Chip-scale transformer coupling ensures >25kV/μs CMTI and 15-year insulation lifetime per IEC 60747-17 - suitable for safety-critical medical interfaces. |
| Self-contained RS-232 interface | On-chip ±10V charge pump (C1/C2) enables full RS-232 voltage swing from single 5V rail - no external voltage converters needed. |
| Robust ESD architecture | ±15kV air-gap HBM on RIN/TOUT allows repeated cable insertion in factory-floor environments without degradation. |
| Dual-mode supply operation | Supports both integrated (VCC = 4.5–5.5V) and externally powered (VCC = 3.0–3.7V + VISO = 3.0–5.5V) configurations - enables flexible system-level power architecture. |
Applications
| Industrial Diagnostic Port | Medical Device Interface |
|---|---|
|
Use Scenario: Connecting handheld service tools to PLCs or CNC controllers via RS-232 in electrically noisy factory environments. IC Role / Device Role / Timing Role: Isolated RS-232 transceiver providing galvanic separation between tool logic and machine bus grounds. Use Value: Prevents ground loop currents and protects tool MCU from 25kV/μs transients induced by nearby motor drives. |
Use Scenario: Interfacing patient monitors to legacy lab analyzers using RS-232 cabling in hospital settings. IC Role / Device Role / Timing Role: Safety-isolated data coupler meeting IEC/EN/CSA 62368-1 and IEC/CSA 61010-1 requirements. Use Value: Enables 2500V rms reinforced insulation barrier to satisfy medical device leakage current and creepage/clearance mandates. |
| Telecom Base Station OAM | Energy Meter Communication |
|
Use Scenario: Remote operations, administration, and maintenance (OAM) port on cellular base station radios exposed to lightning-induced surges. IC Role / Device Role / Timing Role: High-CMTI RS-232 line driver/receiver with ±15kV ESD protection on bus pins. Use Value: Survives repeated 800V common-mode transients (per IEC 61000-4-4) without data corruption or latch-up. |
Use Scenario: Smart electricity meter RS-232 port communicating with handheld readers in outdoor substations. IC Role / Device Role / Timing Role: Single-supply isolated transceiver operating across −40°C to +85°C ambient range. Use Value: Maintains 460kbps data rate and ±5.7V output swing under temperature extremes and humidity exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM3251EARWZ | Same die and specifications; differs only in tape-and-reel packaging (REEL) vs. tube (no suffix) - identical electrical and thermal performance. | No functional difference; REEL variant optimized for automated SMT assembly, tube for prototyping or low-volume hand-soldering. | Select ADM3251EARWZ-REEL for production lines requiring pick-and-place compatibility and moisture-sensitive device (MSD) handling per J-STD-020. |
| ISO150DR | TI's 2.5kV isolated RS-232 transceiver with 1Mbps max rate but no integrated DC-DC - requires external isolated supply. | Suitable where higher speed is prioritized and board space allows discrete isolated power; lacks charge pump and self-contained operation. | Choose ISO150DR only if system already provides isolated 3.3V/5V and demands >460kbps; otherwise ADM3251EARWZ-REEL reduces design complexity. |
Compared with ADM3251EARWZ-REEL, the tube-packaged ADM3251EARWZ offers identical functionality but less automation-friendly handling, while ISO150DR trades integrated power for higher speed and increased BOM cost - making ADM3251EARWZ-REEL optimal for cost-sensitive, space-constrained industrial designs needing true single-supply isolation.
Availability
ADM3251EARWZ-REEL is available at Aetrix Electronics and suitable for industrial diagnostic ports, medical device interfaces, telecom OAM links, and smart energy metering requiring stable component supply across extended temperature ranges and regulatory-compliant isolation.
Supply support for ADM3251EARWZ-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications infrastructure.
The ADM3251E belongs to Analog Devices' isoPower™ + iCoupler® isolated interface product line, engineered specifically for robust, self-contained galvanic isolation in electrically harsh environments where safety certification and EMI resilience are mandatory.
FAQ
What isolation standards does the ADM3251EARWZ-REEL meet?
The ADM3251EARWZ-REEL meets DIN EN IEC 60747-17 (VDE 0884-17) for basic insulation with VIORM = 547V peak, UL 1577 (2500V rms for 1 minute), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1. These certifications validate its suitability for industrial and medical applications requiring certified galvanic separation between logic and bus domains.
Can the ADM3251EARWZ-REEL operate from a 3.3V supply?
Yes - the ADM3251EARWZ-REEL supports dual-supply modes. With VCC = 3.0–3.7V, the internal DC-DC converter disables and VISO must be externally supplied with 3.0–5.5V. In this mode, it maintains full 460kbps data rate and RS-232 compliance, enabling integration into 3.3V system architectures without sacrificing isolation integrity.
How many external capacitors does the ADM3251EARWZ-REEL require?
The ADM3251EARWZ-REEL requires four external 0.1µF ceramic capacitors: two for charge pump stages (C1 between Pins 17–18, C2 between Pins 13–14), plus one each for VCC (Pins 2–4) and VISO (Pins 19–20) decoupling. Larger values up to 10µF are acceptable for C1/C2 to improve ripple suppression.
What is the maximum data rate supported by the ADM3251EARWZ-REEL?
The ADM3251EARWZ-REEL supports a maximum data rate of 460kbps under standard load conditions (RL = 3kΩ–7kΩ, CL = 50pF–1000pF). This exceeds EIA/TIA-232E requirements and is validated across the full −40°C to +85°C temperature range, ensuring reliable high-speed serial communication in demanding environments.
Does the ADM3251EARWZ-REEL include ESD protection on its RS-232 pins?
Yes - the ADM3251EARWZ-REEL provides ±8kV contact discharge and ±15kV air-gap discharge ESD protection on both RIN and TOUT pins per Human Body Model (HBM). This enables reliable operation in field-service scenarios where RS-232 cables are frequently connected/disconnected in electrically noisy locations.
ADM3251EARWZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- IsoPower®, iCoupler®
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- RS232
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 460Kbps
- Propagation Delay tpLH / tpHL (Max):
- 135ns, 190ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 2.3ns, 2.3ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
ADM3251EARWZ-REEL FAQ
1.How can I place an order for ADM3251EARWZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM3251EARWZ-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADM3251EARWZ-REEL reliable?
The price and inventory of ADM3251EARWZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM3251EARWZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM3251EARWZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM3251EARWZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM3251EARWZ-REEL?
ADM3251EARWZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM3251EARWZ-REEL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADM3251EARWZ-REEL?
For technical support, including ADM3251EARWZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM3251EARWZ-REEL requirements.
6.How does Aetrix verify that ADM3251EARWZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM3251EARWZ-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADM3251EARWZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM3251EARWZ-REEL?
All ADM3251EARWZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM3251EARWZ-REEL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADM3251EARWZ-REEL part is unused and in its original packaging.
Return procedure for ADM3251EARWZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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