My Inquiry
My Account
Texas Instruments ISOW7821DWE
- Part No.:
- ISOW7821DWE
- Manufacturer:
- Texas Instruments
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISOW7821DWE.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:116
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISOW7821DWE from Texas Instruments is a reinforced dual-channel digital isolator with integrated high-efficiency DC-DC converter, delivering up to 0.65 W isolated power, 100 Mbps data rate, and 5000 VRMS isolation rating. It eliminates external isolated power supplies in space-constrained industrial and medical systems requiring galvanic separation of signal and power domains.
For engineers reviewing the ISOW7821DWE datasheet, ISOW7821DWE pinout, ISOW7821DWE application, or ISOW7821DWE equivalent, key selection criteria include its dual-channel directionality (INA/OUTA, INB/OUTB), SEL-configurable 3.3 V/5 V isolated output, ±100 kV/µs CMTI, and SOIC-16 wide-body package with reinforced insulation certified per UL 1577, VDE 0884-11, and IEC 62368-1.
Technical Context
The ISOW7821DWE integrates two independent SiO₂-based signal isolation channels and an on-chip transformer-based DC-DC converter operating at >53% efficiency (5 V → 5 V). Its dual-side supply architecture supports asymmetric configurations: VCC (3–5.5 V) powers primary-side logic and converter input, while VISO (3.3 V or 5 V) is set via SEL pin and powers secondary-side logic and load.
Signal integrity is maintained by low propagation delay (13 ns typ), high common-mode transient immunity (±100 kV/µs), and robust EMC performance including ±8 kV IEC 61000-4-2 contact discharge across the barrier. Thermal design is supported by RθJA = 56.8°C/W and thermal shutdown protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577); reinforced insulation per VDE 0884-11:2017-01 |
| Data Rate | 100 Mbps - supports high-speed serial interfaces (e.g., SPI, RS-485 transceiver control) |
| Isolated Power Output | Up to 0.65 W - sufficient to power isolated ADCs, gate drivers, or small microcontrollers |
| Output Voltage Options | Configurable 3.3 V or 5 V via SEL pin - enables direct compatibility with mixed-voltage subsystems |
| CMTI | ±100 kV/µs minimum - ensures reliable operation in noisy motor drive or grid-tied inverter environments |
| Package | 16-pin SOIC-WB (DWE), 10.30 mm × 7.50 mm - provides >8 mm creepage/clearance for reinforced safety |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and medical equipment use |
Pinout & Package
ISOW7821DWE uses a 16-pin wide-body SOIC (DWE) package with 1.27 mm pitch, optimized for reinforced isolation: body size 10.30 mm × 7.50 mm, creepage and clearance >8 mm, DTI >120 µm for power transformer isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary-side supply input | 3–5.5 V input for logic and DC-DC converter primary; connects to GND1 |
| GND1 (pins 2, 8) | Primary-side ground reference | Return path for VCC and side-1 I/O; must be separated from GNDO/GND2 |
| INA, INB | Signal inputs (side-1 and side-2) | LVCMOS-compatible inputs; INB is bidirectional when used as channel B input |
| OUTA, OUTB | Signal outputs (side-1 and side-2) | Push-pull outputs; OUTA driven by INA, OUTB driven by INB; default high on loss of input |
| VISO (pin 16) | Isolated output supply | Regulated 3.3 V or 5 V output set by SEL; powers side-2 logic and external loads |
| GND2 (pins 9, 15) | Secondary-side ground reference | Return path for VISO and side-2 I/O; galvanically isolated from GND1 |
| SEL (pin 11) | VISO voltage select | Connect to GND2 or float → 3.3 V; connect to VISO → 5 V; determines isolated rail voltage |
| EN1 (pin 7) | Side-1 output enable | High or open → outputs enabled; low → OUTA/OUTB in high-impedance state |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC converter with on-chip transformer | Eliminates need for external isolated DC/DC module, reducing BOM count and PCB area by >40% in compact designs |
| Reinforced isolation barrier (5000 VRMS, 7071 VPK) | Meets safety requirements for medical (2 MOPP), industrial (IEC 61010-1), and grid infrastructure applications |
| Soft-start and overload/short-circuit protection | Prevents inrush current damage during power-up and sustains operation during transient overloads without latch-up |
| ±8 kV IEC 61000-4-2 contact ESD across barrier | Enables direct integration into field-connected interfaces without external TVS diodes on isolated side |
| Low emissions and system-level EMC immunity | Reduces need for board-level filtering and shielding, accelerating CE/FCC certification for end equipment |
Applications
| Industrial Motor Drive Control | Medical Patient Monitoring Interface |
|---|---|
|
Use Scenario: Isolating PWM signals and feedback from MCU to gate driver ICs in servo inverters, while powering isolated current sensors. IC Role / Device Role / Timing Role: Dual-channel isolator providing timing-aligned signal transfer and local 5 V power for gate driver bias and sensor analog front-end. Use Value: Enables compact, single-chip isolation + power solution meeting IEC 61800-5-2 functional safety requirements without external DC/DC. |
Use Scenario: Galvanically separating ECG/EEG analog acquisition circuitry from host processor in bedside monitors. IC Role / Device Role / Timing Role: Reinforced isolator delivering 3.3 V isolated power and bidirectional data paths for SPI-configured ADCs and DACs. Use Value: Achieves 2 MOPP patient protection per IEC 60601-1 using single-component solution with certified 7071 VPK transient withstand. |
| Smart Grid Protection Relay | Automated Test Equipment (ATE) |
|
Use Scenario: Isolating digital I/O between FPGA controller and high-voltage trip logic in distribution-class relays. IC Role / Device Role / Timing Role: High-CMTI isolator transferring fault detection flags and enabling isolated 5 V supply for auxiliary monitoring circuits. Use Value: Withstands >10 kVPK surge events and maintains signal integrity in substation EMI environments per IEC 61000-4-5. |
Use Scenario: Providing isolated communication and local power to DUT interface boards in modular ATE racks. IC Role / Device Role / Timing Role: Dual-channel isolator supporting simultaneous SPI and GPIO isolation with configurable 3.3 V/5 V rails for mixed-voltage DUTs. Use Value: Reduces test head complexity by consolidating signal and power isolation into one footprint, improving channel density. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated power applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6421AARWZ | 4-channel isolator + 500 mW isolated DC-DC; 25 Mbps max data rate; SOIC-20 package | Lower speed, higher channel count; requires larger PCB area and lacks SEL-configurable output voltage | Preferred when >2 signal channels needed and 25 Mbps suffices; not drop-in for ISOW7821DWE's 100 Mbps or DWE footprint |
| SI88222ED-IS | Dual-channel isolator only (no integrated DC-DC); requires external isolated power; 100 Mbps; SOIC-16 | No integrated power delivery; needs separate isolated DC/DC (e.g., RECOM RxxPxx), increasing BOM and layout complexity | Select when existing isolated power rail exists or when thermal budget prohibits integrated converter; pinout differs (no SEL/EN1 mapping) |
Compared with ADUM6421AARWZ and SI88222ED-IS, the ISOW7821DWE uniquely combines 100 Mbps speed, SEL-configurable 3.3 V/5 V output, and SOIC-16 footprint-enabling faster, more flexible, and space-efficient isolated power+signal designs without layout redesign.
Availability
ISOW7821DWE is available at Aetrix Electronics and suitable for industrial motor control, medical patient monitoring, smart grid protection relays, and automated test equipment requiring stable component supply and long-term lifecycle support.
Supply support for ISOW7821DWE 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and medical markets.
The ISOW7821DWE belongs to TI's ISOW family of integrated signal + power isolators, designed specifically to replace discrete isolator + DC/DC combinations in space- and safety-critical applications.
FAQ
What is the maximum load current supported by the ISOW7821DWE's isolated DC-DC output?
The ISOW7821DWE delivers up to 130 mA at 5 V output (5 V → 5 V or 5 V → 3.3 V configuration) and up to 75 mA at 3.3 V output (3.3 V → 3.3 V). Load current derates linearly above 80°C ambient for 5 V output and above 105°C for 3.3 V output. The ISOW7821DWE's internal current limiting and thermal shutdown protect against sustained overload conditions.
Does the ISOW7821DWE support bidirectional data transfer on both channels?
The ISOW7821DWE has two unidirectional channels: INA → OUTA and INB → OUTB. However, INB and OUTB can be externally wired to implement bidirectional half-duplex communication (e.g., for SPI SCLK/MOSI/MISO sharing), as confirmed in TI's ISOW7821 datasheet Figure 29. The ISOW7821DWE does not natively support true full-duplex bidirectional signaling on a single pin pair.
How is the isolated output voltage (VISO) selected on the ISOW7821DWE?
VISO is selected via the SEL pin (pin 11): connecting SEL to GND2 or leaving it floating configures VISO to 3.3 V; connecting SEL to VISO configures VISO to 5 V. This selection is latched at power-up and remains fixed until next reset. The ISOW7821DWE's internal regulator maintains tight line/load regulation (<1% load regulation at 130 mA) regardless of SEL setting.
What safety certifications apply to the ISOW7821DWE?
The ISOW7821DWE holds UL 1577 (5000 VRMS), VDE 0884-11:2017-01 (reinforced, 7071 VPK), CSA IEC 62368-1/60950-1/60601-1 (2 MOPP), CQC GB 4943.1-2011, and TUV EN 62368-1/60950-1/61010-1 certifications. These cover reinforced insulation, surge immunity, and end-equipment compliance for industrial, medical, and test equipment applications.
Can the ISOW7821DWE operate with different input and output supply voltages?
Yes - the ISOW7821DWE supports multiple configurations: 5 V input → 5 V output, 5 V input → 3.3 V output, and 3.3 V input → 3.3 V output. Input supply (VCC) ranges from 3 V to 5.5 V. Output voltage (VISO) is determined solely by the SEL pin state and is independent of VCC level within spec. The ISOW7821DWE maintains regulation and efficiency across all supported combinations.
ISOW7821DWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 17.6ns, 17.6ns
- Pulse Width Distortion (Max):
- 4.7ns
- Rise / Fall Time (Typ):
- 4ns, 4ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISOW7821DWE FAQ
1.How can I place an order for ISOW7821DWE through Aetrix?
Please submit a Request for Quotation (RFQ) for ISOW7821DWE 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 ISOW7821DWE reliable?
The price and inventory of ISOW7821DWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISOW7821DWE is usually 5 days.
3.What payment methods are accepted for ISOW7821DWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISOW7821DWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISOW7821DWE?
ISOW7821DWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISOW7821DWE 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 ISOW7821DWE?
For technical support, including ISOW7821DWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISOW7821DWE requirements.
6.How does Aetrix verify that ISOW7821DWE is sourced from the original manufacturer or authorized distributors?
All ISOW7821DWE 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 ISOW7821DWE meets industry standards.
7.What is the process for return or replacement of ISOW7821DWE?
All ISOW7821DWE units undergo pre-shipment inspection (PSI). If there is an issue with ISOW7821DWE, 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 ISOW7821DWE part is unused and in its original packaging.
Return procedure for ISOW7821DWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISOW7821DWE 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
