ADM1491EBRZ-REEL7 Analog Devices Integrated Circuit (Other) In Stock
Analog Devices ADM1491EBRZ-REEL7 is a full-duplex RS-485/RS-422 line transceiver supporting up to 16 Mbps data rate with ESD protection, differential Schmitt trigger inputs, and compliance to EIA-485-A and EIA-422-B standards in a 14-pin SOIC package. From $3 in stock worldwide shipping.
- Manufacturer
- Analog Devices
- Package
- Other
- Pin Count
- 14
- Lifecycle
- ACTIVE
- Datasheet
- ADM1491EBRZ-REEL7 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Full-duplex RS-485/RS-422 transceiver compliant with EIA-485-A and EIA-422-B standards, supporting data rates up to 16 Mbps for high-speed industrial serial communication networks
- ESD-protected differential inputs with Schmitt trigger hysteresis improve noise immunity on long cable runs, preventing false triggering from common-mode interference up to ±7 kV HBM
- Single 1-bit driver with differential output enables point-to-point or multi-drop wiring across cable distances exceeding 100 m at reduced data rates, suitable for industrial field buses
Applications
The ADM1491EBRZ-REEL7 is used in industrial automation, building control, and SCADA systems requiring reliable full-duplex RS-485 or RS-422 serial communication over long cable runs at speeds up to 16 Mbps. Its ESD protection and differential Schmitt trigger inputs provide robust noise immunity in electrically noisy factory environments where cable runs may span 100 m or more. It is also used in motor drive systems, PLC I/O modules, and instrumentation networks where the 14-pin SOIC package enables compact PCB integration of the transceiver function.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | R-14 |
| YTEOL | 10 |
| Differential Output | YES |
| Driver Number of Bits | 1 |
| High Level Input Current-Max | 0.000001A |
| Input Characteristics | DIFFERENTIAL SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-422-B; TIA-422-B; EIA-485-A; TIA-485-A |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Out Swing-Min | 1.5V |
| Output Low Current-Max | 0.004A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Receive Delay-Max | 20ns |
| Receiver Number of Bits | 1 |
| Supply Current-Max | 2mA |
| Supply Voltage-Max | 5.25V |
| Supply Voltage-Min | 4.75V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Transmit Delay-Max | 17ns |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Taiwan |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ADM1491EBRZ-REEL7:
Frequently Asked Questions
At what cable length does the ADM1491EBRZ-REEL7 need to reduce its 16 Mbps data rate to maintain signal integrity on RS-485 networks?
The RS-485 standard allows up to 16 Mbps at short distances of under 10 m with low-capacitance cable. For 100 m cable runs with standard twisted-pair cable having 50 pF/m capacitance, the maximum reliable data rate drops to approximately 1 Mbps. At 1200 m — the maximum RS-485 network length — data rates must be reduced to 100 kbps or below to maintain adequate signal rise times and avoid inter-symbol interference.
How does the differential Schmitt trigger input of the ADM1491EBRZ-REEL7 improve noise rejection compared to a single-ended receiver in a motor drive cabinet?
The differential Schmitt trigger input rejects common-mode noise by only responding to the differential voltage between the A and B lines, ignoring common-mode disturbances of ±7 V on both lines simultaneously. In motor drive cabinets with switching noise of 10 V to 50 V common-mode spike amplitudes, this architecture maintains correct logic transitions where single-ended receivers would produce spurious output toggles, allowing reliable communication at cable distances exceeding 50 m from the drive.
Is the ADM1491EBRZ-REEL7 compatible with RS-422 point-to-point wiring as well as RS-485 multi-drop networks?
Yes, the ADM1491EBRZ-REEL7 complies with both EIA-422-B for RS-422 point-to-point wiring and EIA-485-A for RS-485 multi-drop networks, allowing the same device to be used in both topologies. In RS-422 mode, the full-duplex architecture supports simultaneous bidirectional data transfer at up to 16 Mbps over a single twisted pair in each direction, while in RS-485 multi-drop mode, up to 32 unit loads can share a single bus with the driver enabled for half-duplex operation.
What ESD protection level does the ADM1491EBRZ-REEL7 provide, and why does this matter for field installation in industrial environments?
The ADM1491EBRZ-REEL7 provides up to ±7 kV ESD protection per the Human Body Model on the RS-485 bus pins, which protects against electrostatic discharge events that occur when technicians connect or disconnect field cables without proper grounding. Industrial RS-485 networks in factories or outdoor installations can experience ESD events of several kilovolts from cable handling, and without ±7 kV protection, unprotected transceivers can sustain permanent damage requiring board rework or field replacement.
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