ISO1176DWR RS422/RS485 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO1176DWR is an active RS422/RS485 digital isolator manufactured by Texas Instruments, designed for industrial communication applications requiring galvanic isolation. This capacitive coupling isolator provides 2500Vrms isolation with 3 channels and supports data rates up to 40Mbps. The part is currently in active production status with robust inventory availability (4810 pcs in stock). Substitute parts are identified when equivalent electrical performance, isolation voltage, channel configuration, and package compatibility are maintained across the specified operating parameters.

Substiute Parts

ISO1176DWR

Texas InstrumentsIn Stock: 4875ISO1176DWR Datasheet

Current PartRFQ

ADM2486BRWZ

Analog Devices Inc.In Stock: 2244ADM2486BRWZ Datasheet

MFR RecommendedRFQ

ADM2486BRWZ-REEL

Analog Devices Inc.In Stock: 54358ADM2486BRWZ-REEL Datasheet

MFR RecommendedRFQ

MAX14948EWE+

Analog Devices Inc./Maxim IntegratedIn Stock: 2501MAX14948EWE+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO1176DWR is determined by the following critical parameters:

• Isolation voltage rating of 2500Vrms or higher
• 3-channel configuration with 2/1 input/output split
• RS422/RS485 protocol support
• 16-SOIC package compatibility
• Common Mode Transient Immunity of 25kV/µs or greater
• Operating temperature range of -40°C to 85°C
• Surface mount technology
• Active product status with ROHS3 compliance

Two substitute parts meet these criteria with variations in coupling technology and data rate specifications. The ADM2486BRWZ and ADM2486BRWZ-REEL employ magnetic coupling technology (iCoupler® series) with reduced data rate (20Mbps) but maintain all critical isolation and channel parameters. The MAX14948EWE+ uses capacitive coupling with higher isolation voltage (5000Vrms) and CMTI (35kV/µs) but operates at significantly lower data rates (500kbps).

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the ISO1176DWR.

The ADM2486BRWZ and ADM2486BRWZ-REEL are functionally equivalent for applications operating at data rates of 20Mbps or lower. These parts employ magnetic coupling technology with improved moisture sensitivity characteristics (MSL 1 vs. MSL 2). The primary trade-off is reduced data rate performance (20Mbps versus 40Mbps). The ADM2486BRWZ-REEL variant offers significantly higher inventory (54305 pcs) compared to the tube-packaged ADM2486BRWZ (2220 pcs).

The MAX14948EWE+ provides higher isolation voltage (5000Vrms) and superior Common Mode Transient Immunity (35kV/µs typical), making it suitable for applications requiring enhanced noise immunity. However, the 500kbps data rate limitation restricts its use to low-speed communication protocols. This part is appropriate only for applications where the ISO1176DWR's 40Mbps capability is not required.

Frequently Asked Questions (FAQ)

Q: Can ADM2486BRWZ replace ISO1176DWR in all applications?

A: The ADM2486BRWZ maintains equivalent isolation voltage, channel configuration, and CMTI specifications. Substitution is valid only for applications operating at data rates of 20Mbps or lower. Applications requiring the full 40Mbps data rate capability of the ISO1176DWR cannot use this substitute.

Q: What is the difference between ADM2486BRWZ and ADM2486BRWZ-REEL?

A: Both parts are electrically identical. The primary differences are packaging format (Tube versus Cut Tape & Digi-Reel) and inventory availability. The REEL variant has substantially higher stock levels (54305 pcs versus 2220 pcs).

Q: Why does MAX14948EWE+ have lower data rate than ISO1176DWR?

A: The MAX14948EWE+ uses capacitive coupling technology optimized for high isolation voltage (5000Vrms) and high CMTI (35kV/µs), which results in reduced maximum data rate (500kbps). This design trade-off prioritizes noise immunity over bandwidth.

Q: Are all substitute parts pin-compatible with ISO1176DWR?

A: All substitute parts use the 16-SOIC package with identical physical dimensions (0.295", 7.50mm Width). Pin compatibility must be verified against specific application schematics, as channel configuration differences (unidirectional versus bidirectional) may affect circuit implementation.

Q: What is the impact of different coupling technologies?

A: ISO1176DWR and MAX14948EWE+ use capacitive coupling, while ADM2486BRWZ variants use magnetic coupling (iCoupler®). Both technologies provide equivalent isolation performance at the specified voltage ratings. Magnetic coupling typically offers improved EMI performance and lower power consumption in certain applications.

Q: Can I use MAX14948EWE+ for high-speed RS485 applications?

A: The MAX14948EWE+ is limited to 500kbps data rate, making it unsuitable for high-speed RS485 applications. For applications requiring 40Mbps performance, the ISO1176DWR or equivalent-speed alternatives must be used.