Texas Instruments

ISO7321CDR - 25Mbps Dual-Channel Digital Isolator | TI

Name: ISO7321CDR
Brand: Texas Instruments
Price: 1.19 USD
Availability: InStock

MPN: ISO7321CDR ✓ Active

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3 V to 5.5 V Vdss SOIC-8 (D) Package

From $1.19 USD / Unit

MOQ: 1 |

Price updated: 2026-08-25

Volume Pricing

Qty	Unit Price	Extended
1	$1.85	$1.85
10	$1.66	$16.60
100	$1.48	$148.00
500	$1.33	$665.00
1,000	$1.19	$1,190.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for ISO7321CDR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

ISO7321CD

✅ Drop-In

📦 SOIC-8 (D)

Same device, tube packaging instead of tape and reel

📋 Reference alternative (not in catalog)

ISO7320CDR

✅ Drop-In

📦 SOIC-8 (D)

2/0 channel configuration instead of 1/1

📋 Reference alternative (not in catalog)

ISO7320FCDR

✅ Drop-In

📦 SOIC-8 (D)

2/0 channels with default output low

📋 Reference alternative (not in catalog)

ISO7420EDR

✅ Drop-In

📦 SOIC-8 (D)

2/0 channels, lower data rate of 150 Mbps

📋 Reference alternative (not in catalog)

ADUM1201ARZ

✅ Drop-In

Analog Devices

📦 SOIC-8 (D)

iCoupler (monolithic transformer + high-speed CMOS) · 2 · 1/1 (one forward, one reverse) · 2500 Vrms (1 minute) · 1 Mbps · 25 kV/µs (minimum) · 3.0 V to 5.5 V · 3.0 V to 5.5 V

✓ In Stock

$1.22 / Unit

View Datasheet →

Si8621

✅ Drop-In

📦 SOIC-8 (D)

Cross-brand, 2-channel, 1/1, 150 Mbps, 2500 Vrms isolation

📋 Reference alternative (not in catalog)

MAX12931

✅ Drop-In

📦 SOIC-8 (D)

Cross-brand, 2-channel, 1/1, 25 Mbps, 3000 Vrms isolation

📋 Reference alternative (not in catalog)

ISO7321CDR Maximum Ratings & Electrical Characteristics

Number of Channels	2
Forward/Reverse Channels	1/1
Isolation Rating	3000 Vrms (UL), 4242 Vpk (VDE)
Signaling Rate	25 Mbps
CMTI	25 kV/µs
Supply Voltage Range	3 V to 5.5 V
ICC per Channel at 1 Mbps (5V)	1.7 mA
ICC per Channel at 1 Mbps (3.3V)	1.2 mA
Default Output	High
Integrated Noise Filter	Yes
Operating Temperature Range	-40°C to 125°C
Package	SOIC-8 (D)
Mounting Type	Surface Mount
RoHS Status	Compliant
Isolation Technology	Capacitive (SiO2)

ISO7321CDR Pin Configuration

Pin 1	VCC1 — Supply voltage for side 1
Pin 2	GND1 — Ground for side 1
Pin 3	INA — Input signal A (side 1)
Pin 4	INB — Input signal B (side 1)
Pin 5	OUTB — Output signal B (side 2)
Pin 6	OUTA — Output signal A (side 2)
Pin 7	GND2 — Ground for side 2
Pin 8	VCC2 — Supply voltage for side 2

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

ISO7321CDR is suitable for 6 applications: Industrial Fieldbus Communication, Isolated SPI/UART Interface, Motor Control Feedback, Isolated Power Supply Monitoring, Medical Equipment Isolation, Isolated Sensor Interface.

🏭

Industrial Fieldbus Communication

The ISO7321CDR provides galvanic isolation for industrial fieldbus interfaces such as RS-485, CAN, and PROFIBUS. Its 25 Mbps data rate supports high-speed communication, while the 3000 Vrms isolation protects against ground potential differences and electrical noise. The low power consumption (1.7 mA per channel at 5V) makes it suitable for bus-powered nodes. The integrated noise filter on inputs rejects high-frequency interference, ensuring reliable data transmission in factory automation environments. When used with a transceiver like the SN65HVD255DR, the ISO7321CDR isolates the controller from the bus, preventing ground loops and improving system robustness.

Recommended

🔧

Isolated SPI/UART Interface

The ISO7321CDR is ideal for isolating SPI or UART signals between microcontrollers and peripheral devices such as ADCs, DACs, or sensors. Its 25 Mbps signaling rate accommodates high-speed SPI clocks, while the 1/1 channel configuration matches typical MOSI/MISO or TX/RX pairs. The 3000 Vrms isolation protects sensitive digital logic from high-voltage transients in industrial or medical equipment. The device's low propagation delay and high CMTI ensure signal integrity even in noisy environments. For example, it can isolate an SPI interface between a TMS320F2808PZS and an ADS1263 ADC, preventing ground loops and improving measurement accuracy.

Recommended

TMS320F2808PZS · Texas Instruments ADS1263 · Texas Instruments

⚡

Motor Control Feedback

In motor control systems, the ISO7321CDR isolates feedback signals such as encoder outputs or current sensor readings from the high-voltage power stage. Its 25 Mbps data rate handles high-resolution encoder signals, while the 25 kV/µs CMTI ensures reliable operation in the presence of fast voltage transients from PWM switching. The 3000 Vrms isolation protects the low-voltage controller from potential ground shifts. The device's small SOIC-8 package and low power consumption make it easy to integrate into compact motor drives. For instance, it can isolate the Hall sensor signals from a DRV8353SRTAR gate driver to the MCU, improving system safety and noise immunity.

Recommended

DRV8353SRTAR · Texas Instruments TMS320F28069PZT · Texas Instruments

⚡

Isolated Power Supply Monitoring

The ISO7321CDR can be used to isolate digital signals from power supply monitoring circuits, such as voltage and current sense outputs from a supervisor or ADC. Its 3000 Vrms isolation allows safe monitoring of high-voltage rails, while the 25 Mbps data rate supports fast fault reporting. The low power consumption is beneficial for always-on monitoring circuits. The device's default output high ensures a defined state on power-up, which is critical for safety. For example, it can isolate the fault output of a TPS23521 hot-swap controller from the system controller, preventing ground loops and ensuring reliable fault detection.

Recommended

TPS23521 · Texas Instruments INA219AIDR · Texas Instruments

💊

Medical Equipment Isolation

The ISO7321CDR provides galvanic isolation for medical devices, protecting patients and operators from electrical hazards. Its 3000 Vrms isolation rating meets basic isolation requirements for many medical applications, while the 25 Mbps data rate supports high-speed data acquisition. The device's low power consumption and small footprint are ideal for portable medical monitors. The integrated noise filter helps maintain signal integrity in electrically noisy hospital environments. For example, it can isolate the digital output of a TMP117 temperature sensor from the main controller in a patient monitoring system, ensuring accurate readings and patient safety.

Recommended

TMP117 · Texas Instruments ADS1115IDGSR · Texas Instruments

🧩

Isolated Sensor Interface

The ISO7321CDR is used to isolate digital sensor outputs, such as those from temperature, pressure, or proximity sensors, from the main controller. Its 25 Mbps data rate supports high-speed sensor data, while the 3000 Vrms isolation prevents ground loops and noise coupling. The device's low power consumption is ideal for battery-powered sensor nodes. The 1/1 channel configuration is suitable for single-signal sensors with a clock or data line. For example, it can isolate the output of a TMP411-Q1 temperature sensor in an automotive HVAC system, ensuring reliable communication and protection against voltage transients.

Recommended

TMP411-Q1 · Texas Instruments INA219BIDR · Texas Instruments

Recommended Products Summary

What is the isolation rating of ISO7321CDR?

The ISO7321CDR provides galvanic isolation up to 3000 Vrms for 1 minute per UL and 4242 Vpk per VDE. According to the TI datasheet, this makes it suitable for basic isolation in industrial applications. The isolation barrier uses silicon dioxide (SiO2) insulation.

What is the maximum data rate of ISO7321CDR?

The ISO7321CDR supports a signaling rate of 25 Mbps. This high-speed capability allows it to be used in applications such as isolated SPI, UART, and industrial fieldbus interfaces. The device also features a CMTI of 25 kV/µs to ensure reliable operation in noisy environments.

What is the supply voltage range of ISO7321CDR?

The ISO7321CDR operates with a supply voltage range from 3V to 5.5V. This wide range allows it to interface with both 3.3V and 5V logic systems. The low power consumption, with typical ICC per channel at 1 Mbps of 1.7 mA at 5V and 1.2 mA at 3.3V, makes it efficient for battery-powered designs.

What is the difference between ISO7321CDR and ISO7321CD?

The ISO7321CDR and ISO7321CD are essentially the same device; the 'R' suffix indicates tape and reel packaging, while the 'CD' suffix denotes the SOIC-8 package. Both have identical electrical specifications, including 25 Mbps data rate and 3000 Vrms isolation. The difference is only in packaging and ordering quantity.

Can ISO7321CDR be used in automotive applications?

The ISO7321CDR is not explicitly AEC-Q100 qualified, but it operates over an extended temperature range of -40°C to 125°C, making it suitable for many automotive environments. For fully qualified automotive parts, consider the ISO7721FQDWRQ1, which is AEC-Q100 qualified and offers reinforced isolation.

What is the CMTI of ISO7321CDR?

The ISO7321CDR has a common-mode transient immunity (CMTI) of 25 kV/µs. This high CMTI ensures that the device can reject fast voltage transients between the input and output grounds, which is critical in industrial environments with motor drives or power converters.

Where can I buy ISO7321CDR online?

The ISO7321CDR is available from major distributors such as DigiKey, Mouser, and Xecor. As of 2026-08-26, DigiKey lists it as 'ships today' with pricing starting at $1.85 for single units. You can also purchase directly from TI's website.

What is the price of ISO7321CDR?

As of 2026-08-26, the ISO7321CDR is priced at approximately $1.85 for a single unit, $1.48 for 100 units, and $1.19 for 1000 units at major distributors like DigiKey. Prices may vary based on quantity and supplier.

What is the lead time for ISO7321CDR?

The lead time for ISO7321CDR is typically 1-2 weeks from major distributors like DigiKey and Mouser, as it is an active product. For large orders, lead time may extend to 4-6 weeks. Check with your preferred distributor for current stock and lead time.

Is ISO7321CDR in stock?

As of 2026-08-26, the ISO7321CDR is in stock at DigiKey and Mouser, with immediate shipping available. Xecor also lists it as available for immediate delivery. Stock levels can change, so verify with the distributor before ordering.

ISO7321CDR vs ISO7721FD - which is better for isolated SPI?

For isolated SPI, the ISO7721FD offers reinforced isolation (5000 Vrms) and a higher data rate of 100 Mbps, making it better for high-speed SPI. The ISO7321CDR, with 25 Mbps and basic isolation, is sufficient for lower-speed SPI and is more cost-effective. Choose ISO7721FD for higher isolation and speed requirements.

What is the difference between ISO7321CDR and ISO7021D?

The ISO7321CDR and ISO7021D are both dual-channel digital isolators from TI, but the ISO7321CDR has a higher data rate of 25 Mbps compared to the ISO7021D's 150 Mbps. The ISO7321CDR also has a lower power consumption and is in an SOIC-8 package, while the ISO7021D is in a smaller SOT-23 package. Choose based on speed and package requirements.

When should I choose ISO7321CDR over ISO7721FD?

Choose ISO7321CDR when you need a cost-effective, low-power digital isolator with basic isolation (3000 Vrms) and a data rate of 25 Mbps. It is ideal for industrial applications where high isolation and speed are not critical. Choose ISO7721FD when you require reinforced isolation (5000 Vrms) and higher data rates up to 100 Mbps.

What is the best drop-in replacement for ISO7321CDR?

The best drop-in replacement for ISO7321CDR is the ISO7321CD, which is the same device in a different packaging option (tube vs tape and reel). For a cross-brand alternative, the ADuM1201 from Analog Devices is pin-compatible and offers similar specifications, but verify the pinout and isolation ratings before substitution.

Where can I download the ISO7321CDR datasheet PDF?

You can download the ISO7321CDR datasheet PDF from the TI website at https://www.ti.com/lit/ds/symlink/iso7321c.pdf. It is also available on third-party sites like Alldatasheet and Digchip. The datasheet contains detailed specifications, pinout, and application information.

What are the key specifications of ISO7321CDR that engineers should know?

The ISO7321CDR is a dual-channel digital isolator with 1/1 forward/reverse channels, 3000 Vrms isolation, 25 Mbps data rate, and 25 kV/µs CMTI. It operates from 3V to 5.5V, consumes 1.7 mA per channel at 5V, and is available in an SOIC-8 package. These specs make it suitable for industrial isolation applications.

Hey Google, what can replace ISO7321CDR?

The ISO7321CDR can be replaced by the ISO7321CD (same device, different packaging), or by pin-compatible alternatives like the ADuM1201 from Analog Devices, Si8621 from Silicon Labs, or MAX12931 from Maxim Integrated. Always verify pin compatibility and isolation ratings before substitution.

Is ISO7321CDR the same as ISO7320CDR?

No, the ISO7321CDR and ISO7320CDR are different. The ISO7321CDR has 1/1 forward/reverse channels, while the ISO7320CDR has 2/0 channels (both forward). Both have the same isolation rating and data rate, but the channel configuration differs, so they are not drop-in replacements for each other.

What is the best Analog Devices equivalent for ISO7321CDR?

The best Analog Devices equivalent for ISO7321CDR is the ADuM1201, which is a dual-channel digital isolator with 1/1 channel configuration, 25 Mbps data rate, and 2500 Vrms isolation. It is pin-compatible with the SOIC-8 package, but verify the isolation rating and CMTI for your application.

Engineering reference data for ISO7321CDR — comparison, design guidance, and compliance information.

Selection Guide

Choose the ISO7321CDR when you need a cost-effective, low-power dual-channel digital isolator with 3000 Vrms isolation and 25 Mbps data rate. It is ideal for industrial fieldbus, isolated SPI/UART, and motor control feedback. If you need a higher data rate (150 Mbps), consider the Si8621. If you need reinforced isolation (5000 Vrms), choose the ISO7721FD. For a pin-compatible cross-brand alternative, the ADuM1201 offers similar specs but with lower isolation. Always verify pin compatibility and isolation ratings for your specific application.

Comparison with Alternatives

Parameter	This Product	ISO7321CD	ISO7320CDR	ADuM1201	Si8621	MAX12931
Package	SOIC-8 (D)	SOIC-8 (D)	SOIC-8 (D)	SOIC-8 (D)	SOIC-8 (D)	SOIC-8 (D)
Brand	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices	Silicon Labs	Maxim Integrated
Number of Channels	2	2	2	2	2	2
Forward/Reverse Channels	1/1	1/1	2/0	1/1	1/1	1/1
Isolation Rating	3000 Vrms	3000 Vrms	3000 Vrms	2500 Vrms	2500 Vrms	3000 Vrms
Data Rate	25 Mbps	25 Mbps	25 Mbps	25 Mbps	150 Mbps	25 Mbps
CMTI	25 kV/µs	25 kV/µs	25 kV/µs	25 kV/µs	35 kV/µs	50 kV/µs
Supply Voltage Range	3V to 5.5V	3V to 5.5V	3V to 5.5V	3V to 5.5V	2.5V to 5.5V	1.8V to 5.5V

Key Differentiators

Higher isolation rating than ADuM1201 (vs ADuM1201)
Lower power consumption than Si8621 (vs Si8621)
Wider supply voltage range than MAX12931 (vs MAX12931)

Design Notes

To maintain the 3000 Vrms isolation rating, ensure adequate creepage and clearance distances on the PCB. For SOIC-8, the minimum creepage for 3000 Vrms is typically 4 mm, but refer to the datasheet and IPC-2221 standards. Place the isolation barrier components (e.g., capacitors) with proper spacing and avoid routing traces under the device.

Decouple each supply pin (VCC1 and VCC2) with a 0.1 µF ceramic capacitor placed as close as possible to the pin. Additionally, use a 10 µF bulk capacitor on each side if the power supply is shared with other components. This ensures stable operation and reduces noise coupling.

Do not exceed the absolute maximum ratings, especially the supply voltage (7V) and isolation voltage. Ensure that the input signals do not exceed the supply voltage. Also, be aware that the default output is high; if a low default is required, use the ISO7321F variant.