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Analog Devices Inc. ADM3251EARWZ
- Part No.:
- ADM3251EARWZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM3251EARWZ.pdf
- Description:
- DGTL ISO 2500VRMS RS232 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:913
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Product details
Overview
ADM3251EARWZ 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 (VIOS = 2500V rms), supports 460kbps data rates, operates from a single 5V supply, and features ±15kV HBM ESD protection on RIN/TOUT pins - enabling robust serial communication in industrial diagnostics and medical equipment.
For engineers reviewing the ADM3251EARWZ datasheet, ADM3251EARWZ pinout, ADM3251EARWZ application, or ADM3251EARWZ equivalent, key selection criteria include its integrated isolated power architecture, wide-body SOIC-20 package with 3.5mm creepage/clearance, high common-mode transient immunity (>25kV/μs), and compliance with DIN EN IEC 60747-17, UL 1577, and IEC/EN/CSA 62368-1.
Technical Context
The ADM3251EARWZ implements dual-channel magnetic isolation using chip-scale transformers for both logic signals and power transfer. Its isoPower DC-DC converter generates isolated VISO internally when VCC is 4.5–5.5V, eliminating external isolated supplies. The transceiver section conforms to EIA/TIA-232E and ITU-T V.28 standards with ±5.7V RS-232 output swing into 3kΩ loads.
It uses a 200kHz charge pump to generate ±10V RS-232 supplies from 5V, includes Schmitt-trigger receiver input with 0.1V hysteresis and 5kΩ internal pull-down, and maintains specification-compliant operation under common-mode transients up to 25kV/μs at logic-high and logic-low outputs.
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 - enables basic insulation in safety-critical systems. |
| Data Rate | 460kbps maximum (RL = 3–7kΩ, CL = 50–1000pF) - exceeds standard RS-232 requirements for high-speed diagnostic links. |
| ESD Protection | ±15kV air-gap, ±8kV contact discharge on RIN/TOUT pins - eliminates need for external TVS diodes in hot-plug environments. |
| Supply Configuration | Single 5V input (VCC = 4.5–5.5V) powers both logic and isolated bus side via integrated DC-DC - removes requirement for separate isolated DC-DC converter. |
| Common-Mode Immunity | >25kV/μs at both logic-high and logic-low outputs - ensures reliable operation in electrically noisy industrial settings with fast transients. |
| Operating Temperature | −40°C to +85°C industrial range - validated for embedded deployment in factory automation and field-deployed medical devices. |
| 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 is housed in a 20-lead wide-body SOIC package (RW-20) with 0.65mm lead pitch and 7.6mm body width. Creepage and clearance distances between primary and secondary sides are 3.5mm per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No-connect pin; must remain unconnected to avoid compromising isolation integrity. |
| 2, 3 | VCC | Primary-side 5V supply input; enables internal DC-DC converter when 4.5–5.5V applied; requires 0.1µF decoupling to GND. |
| 4, 5, 6, 7, 10 | GND | Logic ground reference for primary-side circuitry; thermal and EMI performance depends on low-inductance connection to PCB ground plane. |
| 8 | ROUT | CMOS-level receiver output (inverted); drives 5V logic with VROUTH ≥ VCC − 0.1V at −20µA load. |
| 9 | TIN | CMOS/TTL-compatible transmitter input referenced to GND; accepts 0.3VCC/0.7VCC thresholds. |
| 11 | GNDISO | Isolated ground reference for RS-232 side; must be separated from GND by ≥3.5mm creepage on PCB. |
| 12 | V− | Internally generated −10V RS-232 supply; connects to external C2 capacitor (pins 13/14). |
| 13, 14 | C2−, C2+ | Charge pump capacitor terminals for negative voltage generation; 0.1µF recommended (up to 10µF usable). |
| 15 | RIN | RS-232 receiver input with ±30V tolerance, 5kΩ internal pull-down, and Schmitt-trigger hysteresis (0.1V). |
| 16 | TOUT | RS-232 transmitter output; delivers ±5.7V swing into 3kΩ load with 300Ω output resistance. |
| 17, 18 | C1−, C1+ | Charge pump capacitor terminals for positive voltage generation; 0.1µF recommended (up to 10µF usable). |
| 19 | V+ | Internally generated +10V RS-232 supply; connects to external C1 capacitor (pins 17/18). |
| 20 | VISO | Isolated secondary-side supply output (5.0V typ.); must not power external circuitry when DC-DC is enabled. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isoPower DC-DC | Eliminates need for external isolated power supply - reduces BOM count and board space in compact diagnostic ports. |
| iCoupler® magnetic isolation | Chip-scale transformer coupling provides 2.5kV isolation without optocoupler aging or LED degradation over time. |
| High ESD robustness | ±15kV air-gap ESD on RIN/TOUT allows direct connection to RS-232 cables in hospital or factory floor environments. |
| Wide operating temperature | −40°C to +85°C rating ensures stable timing and signal integrity in uncontrolled ambient conditions. |
| Low EMI layout support | Optimized for 6-layer PCB designs with buried capacitive planes and edge guarding to meet FCC Class B emissions. |
Applications
| Industrial Diagnostic Port | Medical Device Interface |
|---|---|
|
Use Scenario: Connecting handheld service tools to PLCs or motor drives via RS-232 for firmware updates and real-time parameter readback. IC Role / Device Role / Timing Role: Isolated RS-232 transceiver providing galvanic separation between tool and equipment to prevent ground loops and fault propagation. Use Value: Enables safe, hot-pluggable communication in electrically noisy factory floors where ±15kV ESD events occur during cable insertion. |
Use Scenario: Linking patient monitors to central nursing stations using legacy RS-232 infrastructure in hospitals. IC Role / Device Role / Timing Role: Safety-isolated data interface meeting IEC/EN/CSA 62368-1 and IEC/CSA 61010-1 for medical electrical equipment. Use Value: Provides 2500V rms isolation barrier certified to UL 1577 and DIN EN IEC 60747-17, ensuring patient and operator protection. |
| Telecom Network Management | Test & Measurement Equipment |
|
Use Scenario: Remote configuration of base station controllers via RS-232 console ports located in outdoor cabinets exposed to lightning-induced transients. IC Role / Device Role / Timing Role: High common-mode transient immunity (>25kV/μs) isolator protecting sensitive control logic from induced surges. Use Value: Maintains data integrity during fast-rising transients without latch-up or reset, reducing field service calls. |
Use Scenario: Integrating RS-232 control into automated test fixtures for semiconductor burn-in systems requiring precise timing and noise immunity. IC Role / Device Role / Timing Role: 460kbps-capable transceiver with <650ns transmitter propagation delay enabling deterministic command-response latency. Use Value: Supports high-throughput test sequences without baud-rate bottlenecks while maintaining isolation between DUT and host PC. |
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-REEL | Same die, tape-and-reel packaging; identical electrical specs and isolation ratings. | No functional difference; selected for automated SMT assembly only. | Choose ADM3251EARWZ for sample evaluation or manual prototyping; select ADM3251EARWZ-REEL for volume production. |
| MAX3251ESA+ | 3.3V-only operation, no integrated isolated power, requires external isolated supply; 250V rms isolation (VIOS). | Lacks isoPower integration - increases BOM cost and design complexity for isolated power delivery. | Select MAX3251ESA+ only if system already provides isolated 3.3V and lower isolation voltage suffices for non-safety-critical use. |
Compared with ADM3251EARWZ, ADM3251EARWZ-REEL offers identical performance in automated manufacturing, while MAX3251ESA+ trades integrated isolation power for reduced integration and lower isolation capability - making it suitable only where external isolated supplies exist and safety certification is less stringent.
Availability
ADM3251EARWZ is available at Aetrix Electronics and suitable for industrial diagnostics, medical device interfaces, and telecom management systems requiring stable component supply, long-term lifecycle assurance, and certified safety isolation.
Supply support for ADM3251EARWZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The ADM3251E product line delivers fully integrated, safety-certified isolated RS-232 solutions targeting industrial automation, medical instrumentation, and communications infrastructure where galvanic separation and regulatory compliance are mandatory.
FAQ
What is the isolation voltage rating of the ADM3251EARWZ?
The ADM3251EARWZ is rated for 2500V rms isolation voltage for 1 minute per UL 1577, with a maximum repetitive peak isolation voltage (VIORM) of 547V peak per DIN EN IEC 60747-17. This qualifies it for basic insulation in systems complying with IEC/EN/CSA 62368-1 and IEC/CSA 61010-1. The isolation barrier is implemented using iCoupler® chip-scale transformers, not optocouplers or capacitors.
Can the ADM3251EARWZ operate from a 3.3V supply?
Yes, the ADM3251EARWZ supports dual-supply modes: with VCC = 4.5–5.5V, its internal isoPower DC-DC converter is enabled and supplies VISO; with VCC = 3.0–3.7V, the DC-DC converter disables and VISO must be externally powered at 3.0–5.5V. In both cases, the ADM3251EARWZ maintains full 460kbps operation and RS-232 compliance, but the 3.3V mode requires an external isolated supply.
Does the ADM3251EARWZ require external charge pump capacitors?
Yes, the ADM3251EARWZ requires four external 0.1µF ceramic capacitors: two for the C1± and C2± charge pump networks (pins 13/14 and 17/18), plus bypass capacitors on VCC (pins 2/3 to GND) and VISO (pin 20 to GNDISO). Larger values up to 10µF are acceptable for C1/C2 to improve ripple suppression, but 0.1µF is the recommended value per the datasheet.
What safety certifications does the ADM3251EARWZ hold?
The ADM3251EARWZ holds UL 1577 (File E214100), CSA C22.2 No. 14-18 (File 205078), DIN EN IEC 60747-17 (VDE 0884-17, Certificate 40061310), and IEC/EN/CSA 62368-1. These cover reinforced insulation at 390V rms and basic insulation at 780V rms, supporting use in medical (IEC 61010-1) and industrial safety-critical applications.
How does the ADM3251EARWZ handle RS-232 receiver inputs when disconnected?
The ADM3251EARWZ includes a 5kΩ internal pull-down resistor on the RIN pin. When the RS-232 input is unconnected or tied to GNDISO, this resistor pulls RIN to 0V, resulting in a logic-high (VROUTH ≥ VCC − 0.1V) at the ROUT output due to the receiver's inverting architecture. This fail-safe behavior ensures predictable idle-state signaling without external biasing components.
ADM3251EARWZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- IsoPower®, iCoupler®
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ADM3251EARWZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM3251EARWZ 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 reliable?
The price and inventory of ADM3251EARWZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM3251EARWZ is usually 5 days.
3.What payment methods are accepted for ADM3251EARWZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM3251EARWZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM3251EARWZ?
ADM3251EARWZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM3251EARWZ 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?
For technical support, including ADM3251EARWZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM3251EARWZ requirements.
6.How does Aetrix verify that ADM3251EARWZ is sourced from the original manufacturer or authorized distributors?
All ADM3251EARWZ 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 meets industry standards.
7.What is the process for return or replacement of ADM3251EARWZ?
All ADM3251EARWZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM3251EARWZ, 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 part is unused and in its original packaging.
Return procedure for ADM3251EARWZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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