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ISO1176DW
Texas Instruments
ISO RS485/422 PROFIBUS 2.5KVRMS
1308 Pcs New Original In Stock
RS422, RS485 Digital Isolator 2500Vrms 3 Channel 40Mbps 25kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
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5.0 / 5.0
- (111 Ratings)
ISO1176DW
Product Overview
1276143
DiGi Electronics Part Number
ISO1176DW-DGManufacturer
Texas Instruments
ISO1176DW
Description
ISO RS485/422 PROFIBUS 2.5KVRMSInventory
1308 Pcs New Original In Stock
RS422, RS485 Digital Isolator 2500Vrms 3 Channel 40Mbps 25kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
Quantity
Minimum 1
Minimum 1
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ISO1176DW Technical Specifications
Category
Digital Isolators
Packaging
Tube
Series
-
Product Status
Last Time Buy
Technology
Capacitive Coupling
Type
RS422, RS485
Isolated Power
No
Number of Channels
3
Inputs - Side 1/Side 2
2/1
Channel Type
Unidirectional
Voltage - Isolation
2500Vrms
Common Mode Transient Immunity (Min)
25kV/µs
Data Rate
40Mbps
Propagation Delay tpLH / tpHL (Max)
-
Pulse Width Distortion (Max)
-
Rise / Fall Time (Typ)
-
Voltage - Supply
3.15V ~ 5.5V, 4.75V ~ 5.25V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.295", 7.50mm Width)
Supplier Device Package
16-SOIC
Base Product Number
ISO1176
Datasheet & Documents
Manufacturer Product Page
ISO1176DW Specifications
HTML Datasheet
ISO1176DW-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
5A991B1
HTSUS
8542.39.0001
Additional Information
Other Names
ISO1176DW-DG
-296-23604-5-DG
296-23604-5
-ISO1176DWG4-NDR
2156-ISO1176DW
-296-23604-5-NDR
-296-23604-5
-ISO1176DWG4
TEXTISISO1176DW
296-23604-5-NDR
-ISO1176DW-NDR
Standard Package
40
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
物流速度比我預期的還要快，收貨時還附贈了貼心的感謝卡，非常貼心。
de desembre 02, 2025
Support from DiGi Electronics after purchase has been outstanding, with fast responses and knowledgeable assistance.
de desembre 02, 2025
Their products have a premium feel and perform flawlessly.
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Frequently Asked Questions (FAQ)
Can the ISO1176DW be safely used as a drop-in replacement for the MAX14949EWE+ in a PROFIBUS application with 24V industrial noise environments?
The ISO1176DW is not a direct drop-in replacement for the MAX14949EWE+ due to key architectural differences: the MAX14949EWE+ integrates isolated DC-DC power, while the ISO1176DW requires external isolated power supplies on both sides. In 24V industrial environments with high common-mode noise, this means you must ensure robust isolated power delivery to maintain signal integrity. Additionally, while both support 2.5 kVrms isolation and PROFIBUS data rates, the ISO1176DW’s 25 kV/µs CMTI may offer better resilience to fast transients—but only if your power isolation matches. Design-in requires careful validation of your power architecture; otherwise, noise coupling through poorly isolated rails can negate the isolator’s benefits.
What are the risks of using the ISO1176DW in a multi-node RS485 network operating near its 40 Mbps limit with long cable runs?
Operating the ISO1176DW near its 40 Mbps data rate over long cables introduces significant signal integrity risks due to propagation delay skew and pulse width distortion, even though these parameters aren’t fully specified in the datasheet. At high speeds, transmission line effects (reflections, attenuation) become critical, and the lack of integrated failsafe biasing or slew-rate control in the ISO1176DW means you must implement external termination and biasing networks precisely. Without proper impedance matching and cable length limits (typically <10m at 40 Mbps), you risk bit errors, EMI emissions, and bus contention. Always validate eye diagrams in your actual layout and consider derating to 20–30 Mbps for runs exceeding 5 meters.
How does the capacitive isolation in the ISO1176DW compare to magnetic or optocoupler-based alternatives like the ADM2486BRWZ in terms of long-term reliability under high-voltage stress?
The ISO1176DW uses capacitive coupling, which offers superior common-mode transient immunity (25 kV/µs) and longer operational life compared to optocouplers like those in the ADM2486BRWZ, which degrade over time due to LED aging—especially under temperature cycling and high humidity. However, capacitive isolators are more sensitive to PCB contamination and moisture ingress; thus, conformal coating and clean assembly processes are essential. Unlike the ADM2486BRWZ (which includes integrated isolated power), the ISO1176DW demands external isolated supplies, increasing system complexity but allowing flexibility in power architecture. For high-reliability industrial systems, the ISO1176DW’s solid-state design reduces drift and failure modes, provided your board-level isolation spacing and creepage meet IEC 61010 requirements.
Is it safe to operate the ISO1176DW at 5.5V on the logic side while the bus side runs at 3.3V in a mixed-voltage RS485 system, and what layout precautions are needed?
Yes, the ISO1176DW supports asymmetric supply voltages (3.15V–5.5V on side 1, 4.75V–5.25V on side 2), so running 5.5V logic with a 3.3V bus-side transceiver is feasible—but only if the bus-side voltage stays within its specified range. Note that side 2 (typically the bus side) has a narrower 4.75V–5.25V window, so 3.3V operation isn’t supported on that side. If your transceiver is 3.3V-compatible, it must connect to side 1. Critical layout precautions include maintaining >8 mm creepage between isolated grounds, avoiding split planes under the device, and placing bypass capacitors (<10 mm from pins) on both sides. Failure to isolate ground domains properly can compromise the 2.5 kVrms rating and introduce noise coupling.
Given that the ISO1176DW is in Last Time Buy status, what are the key reliability and sourcing risks if I design it into a new product slated for 10-year production?
Designing in the ISO1176DW for a 10-year product lifecycle poses serious long-term availability and qualification risks. As a Last Time Buy component, TI will not manufacture it beyond a final shipment date, leaving no replenishment options. Even with current stock (1,236 pcs), you risk line stoppages if demand exceeds forecasts or if field returns consume inventory. Additionally, future compliance updates (e.g., revised RoHS or safety standards) won’t apply to this part. Mitigation requires either securing a lifetime buy with contractual guarantees or migrating to a supported alternative like the ISO1176DWR (tape-and-reel version with identical specs) or cross-qualifying the MAX14949EWE+. Always validate second-source compatibility early and consider lifecycle-managed isolators from vendors with product longevity programs.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
ISO1176DW CAD Models
Texas Instruments ISO1176DW PCB symbols & footprints
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