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Analog Devices Inc. ADUM1280BRZ-RL7
- Part No.:
- ADUM1280BRZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADUM1280BRZ-RL7.pdf
- Description:
- DGTL ISO 3000VRMS 2CH GP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,900
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Product details
Overview
ADUM1280BRZ-RL7 from Analog Devices is a 3 kVRMS dual-channel digital isolator based on iCoupler® transformer technology, providing bidirectional signal isolation with 100 Mbps data rate, 23 ns typical propagation delay, and 3.3 V to 5 V level translation. It features default-high output logic, operates from −40°C to +125°C, and is used in industrial field bus interfaces requiring high common-mode transient immunity (>25 kV/µs).
For engineers reviewing the ADUM1280BRZ-RL7 datasheet, ADUM1280BRZ-RL7 pinout, ADUM1280BRZ-RL7 application, or ADUM1280BRZ-RL7 equivalent, this page delivers verified specifications, safety-certified insulation parameters (UL 1577, VDE 0884-17), channel-level truth table behavior, and real-world design implications for mixed-voltage isolation systems.
Technical Context
The ADUM1280BRZ-RL7 implements two independent galvanic isolation channels using monolithic air-core transformers, enabling dc-correct signal transmission without optical components. Its patented refresh circuit maintains output state during input inactivity, eliminating dc drift issues found in optocouplers.
It supports asymmetric supply configurations (e.g., 5 V on Side 1, 3.3 V on Side 2), with logic thresholds referenced to respective VDDx rails (VIH = 0.7×VDDx, VIL = 0.3×VDDx) and output drive capability up to ±3.2 mA per channel at defined VOL/VOH levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 100 Mbps NRZ - enables high-speed SPI, RS-485, or CAN FD interface isolation without timing bottlenecks. |
| Propagation Delay | 23 ns typical (C grade) - ensures tight timing alignment in synchronous digital systems like motor control feedback loops. |
| Common-Mode Transient Immunity | >25 kV/µs - sustains reliable operation in noisy industrial environments with fast-switching power electronics. |
| Isolation Rating | 3000 VRMS for 1 minute, VIORM = 565 VPEAK - meets reinforced insulation requirements per IEC 62368-1 and DIN EN IEC 60747-17. |
| Supply Range | 3.135 V to 5.5 V per side - allows flexible integration across 3.3 V microcontrollers and 5 V legacy peripherals. |
| Default Output State | High - provides fail-safe logic-high assertion on power-up or input-side undervoltage, critical for safety interlock circuits. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial motor drive applications. |
Pinout & Package
Narrow-body 8-lead SOIC package (SOIC_N), RoHS-compliant, with 4.0 mm creepage and clearance per IEC 62368-1 (pollution degree 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD1 | Input-side supply | Power rail for Side 1 logic inputs (VIA, VIB); must be within 3.135–5.5 V; powers internal refresh circuitry. |
| 2 - VIA | Input A | Primary logic input on Side 1; drives isolated output VOA with default-high behavior when unpowered. |
| 3 - VIB | Input B | Secondary logic input on Side 1; drives isolated output VOB; supports independent channel operation. |
| 4 - GND1 | Input-side ground | Reference return for VDD1, VIA, and VIB; must be isolated from GND2 by PCB layout and system grounding. |
| 5 - GND2 | Output-side ground | Reference return for VDD2, VOA, and VOB; forms the isolated secondary domain with no conductive path to GND1. |
| 6 - VOB | Output B | Isolated replica of VIB; logic-high default ensures safe state during VDD1 loss or startup. |
| 7 - VOA | Output A | Isolated replica of VIA; synchronized with input via transformer coupling; jitter ≤1 ns supports precise timing. |
| 8 - VDD2 | Output-side supply | Power rail for Side 2 outputs (VOA, VOB); enables level translation - e.g., 3.3 V input → 5 V output. |
Key Features
| Feature | Design Value |
|---|---|
| Patented dc-correct refresh | Maintains valid output logic state indefinitely without input transitions - eliminates need for external watchdog or clock injection. |
| Asymmetric voltage operation | Supports 3.3 V ↔ 5 V level translation across isolation barrier - simplifies interface between modern MCUs and legacy 5 V peripherals. |
| Tight channel matching | ≤2 ns pulse width distortion and ≤5 ns codirectional skew - preserves signal integrity in differential or time-critical protocols. |
| AEC-Q100 qualification | Qualified for automotive applications (Grade 1: −40°C to +125°C) - validated for battery monitoring and motor inverter gate drive isolation. |
| Reinforced insulation certification | UL 1577 (3000 VRMS), VDE 0884-17 (VIORM = 565 VPEAK) - satisfies safety requirements for mains-connected industrial equipment. |
Applications
| Industrial Field Bus Isolation | Data Converter Interface |
|---|---|
|
Use Scenario: Isolating RS-485 transceivers in PLC backplanes exposed to 4 kV surge events and >10 kV/µs transients. IC Role / Device Role / Timing Role: Dual-channel signal isolator bridging controller UART and bus PHY, preserving full-duplex timing at 25 Mbps. Use Value: Enables 3000 VRMS working voltage compliance while maintaining sub-30 ns propagation delay for deterministic bus arbitration. |
Use Scenario: Isolating SPI lines between an FPGA and isolated ADC/DAC in precision power metering. IC Role / Device Role / Timing Role: Bidirectional clock/data isolator with matched channel delays ensuring setup/hold timing margins for 10 MSPS conversions. Use Value: Eliminates ground loop noise and prevents fault propagation while supporting 100 Mbps SPI clock rates with <2 ns skew. |
| Hybrid Electric Vehicle Battery Monitor | Motor Drive Gate Driver Interface |
|
Use Scenario: Isolating cell voltage measurement signals from high-voltage battery stacks (up to 800 VDC) to low-voltage MCU domain. IC Role / Device Role / Timing Role: High-CMTI isolator transmitting analog front-end status and fault flags with default-high safety assertion. Use Value: Provides AEC-Q100 Grade 1 reliability and >25 kV/µs CMTI to reject switching noise from adjacent IGBT modules. |
Use Scenario: Isolating PWM signals from MCU to half-bridge gate drivers in servo inverters operating at 20 kHz switching frequency. IC Role / Device Role / Timing Role: Dual-channel isolator delivering matched, low-jitter gate enable/disable signals to upper/lower FET drivers. Use Value: Ensures <5 ns channel-to-channel skew to prevent shoot-through, while 125°C rating supports compact heatsink-integrated designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8620ED-B-IS | Capacitive isolation; 5000 VRMS rating; 150 Mbps max; no default-output state specification. | Higher isolation voltage but lacks guaranteed default-high behavior on power loss. | Prefer ADUM1280BRZ-RL7 where fail-safe high-state assertion is required for safety interlocks. |
| ISO7721DWR | Capacitive isolation; 5000 VRMS; 100 Mbps; default-low output; lower quiescent current (1.4 mA @ 3.3 V). | Not suitable for applications requiring default-high outputs; requires external pull-up for fail-safe behavior. | Select ADUM1280BRZ-RL7 when default-high logic and AEC-Q100 qualification are mandatory. |
Compared with SI8620ED-B-IS and ISO7721DWR, the ADUM1280BRZ-RL7 uniquely combines guaranteed default-high output, AEC-Q100 qualification, and VDE 0884-17 reinforced insulation - making it optimal for automotive battery management and industrial safety-critical isolation.
Availability
ADUM1280BRZ-RL7 is available at Aetrix Electronics and suitable for industrial field bus isolation, battery monitor systems, and motor drive gate driver interfaces requiring stable component supply, long-term lifecycle support, and certified safety compliance.
Supply support for ADUM1280BRZ-RL7 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, serving industrial, automotive, communications, and healthcare markets.
The ADUM1280BRZ-RL7 belongs to the iCoupler® digital isolator product line, engineered specifically for robust galvanic isolation in high-noise, safety-critical systems where optocoupler limitations-such as aging, speed, and temperature drift-are unacceptable.
FAQ
What is the default output state of the ADUM1280BRZ-RL7?
The ADUM1280BRZ-RL7 has a default-high output state: when VDD1 is unpowered or below UVLO threshold (2.65 V), both VOA and VOB assert logic high. This behavior is confirmed in Tables 22 and 24 of the Rev. E datasheet and ensures fail-safe operation in safety-critical interfaces such as emergency stop circuits. The ADUM1280BRZ-RL7 maintains this state until valid input transitions occur after VDD1 restoration.
Does the ADUM1280BRZ-RL7 support level translation between 3.3 V and 5 V domains?
Yes, the ADUM1280BRZ-RL7 supports bidirectional level translation: VDD1 may be 3.3 V while VDD2 is 5 V (or vice versa), with logic thresholds (VIH/VIL) scaling to each side's supply. Table 7 and Table 10 confirm full 100 Mbps operation in mixed-supply modes. The ADUM1280BRZ-RL7 achieves this without external components, enabling direct interfacing between 3.3 V microcontrollers and 5 V peripherals like RS-485 transceivers.
What safety certifications does the ADUM1280BRZ-RL7 hold?
The ADUM1280BRZ-RL7 is certified to UL 1577 (3000 VRMS, 1 min), DIN EN IEC 60747-17 (VDE 0884-17, VIORM = 565 VPEAK), IEC/EN/CSA 62368-1, and IEC/CSA 61010-1. These approvals are explicitly listed in Table 14 and Table 16 of the datasheet. The ADUM1280BRZ-RL7 is rated for reinforced insulation and meets pollution degree 2 requirements with 4.0 mm creepage/clearance - validated for industrial and automotive end-equipment.
How does the ADUM1280BRZ-RL7 handle power loss on one side?
When VDD1 is lost, the ADUM1280BRZ-RL7 outputs (VOA/VOB) remain high for up to 1.6 µs before settling into their default-high state - per Table 22 and the "DC Correctness" section. When VDD2 is lost, outputs become indeterminate but recover within 1.6 µs of restoration. This behavior is enabled by the patented refresh circuit and is intrinsic to the ADUM1280BRZ-RL7's architecture - no external components are needed to maintain dc correctness.
Is the ADUM1280BRZ-RL7 pin-compatible with other members of the ADuM128x family?
No - the ADUM1280BRZ-RL7 uses the ADuM1280/ADuM1285 pinout (VIA/VIB on pins 2/3, VOA/VOB on pins 7/6), whereas ADuM1281/ADuM1286 swap input/output positions (VIA on pin 7, VOA on pin 2). This difference is documented in Figures 4 and 5 and Tables 20–21. Substituting ADUM1280BRZ-RL7 for ADUM1281BRZ-RL7 without PCB revision will cause functional failure. The ADUM1280BRZ-RL7 is not a drop-in replacement for any other variant in the family.
ADUM1280BRZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCoupler®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 2/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 35ns, 35ns
- Pulse Width Distortion (Max):
- 3ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADUM1280BRZ-RL7 FAQ
1.How can I place an order for ADUM1280BRZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM1280BRZ-RL7 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 ADUM1280BRZ-RL7 reliable?
The price and inventory of ADUM1280BRZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM1280BRZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADUM1280BRZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM1280BRZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM1280BRZ-RL7?
ADUM1280BRZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM1280BRZ-RL7 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 ADUM1280BRZ-RL7?
For technical support, including ADUM1280BRZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM1280BRZ-RL7 requirements.
6.How does Aetrix verify that ADUM1280BRZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADUM1280BRZ-RL7 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 ADUM1280BRZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADUM1280BRZ-RL7?
All ADUM1280BRZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADUM1280BRZ-RL7, 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 ADUM1280BRZ-RL7 part is unused and in its original packaging.
Return procedure for ADUM1280BRZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADUM1280BRZ-RL7 Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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