Quad-Channel Standard Digital Isolators Contributing to Lower Power Consumption in Industrial Equipment

Quad-Channel Standard Digital Isolators Contributing to Lower Power Consumption in Industrial Equipment

Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched two products in the DCL341x0B Series, quad‑channel standard digital isolators for industrial equipment that achieve a low operating current of 0.2mA[1] per channel, support mid‑speed[2] communications, and feature a small SSOP16 package.
The new lineup consists of two products: the DCL341L0B, which features a default output logic[3] of Low, and the DCL341H0B, which features a default output logic of High. Both products offer a 4‑channel configuration with three forward channels and one reverse channel.

In recent years, industrial equipment such as programmable logic controllers (PLCs), actuators, and inverters has increasingly required measures to prevent equipment failures, the propagation of abnormal conditions, and malfunctions caused by noise, which continue to increase as devices operate at higher speeds. To address these issues, electrical isolation that safely and reliably transmit signals between circuits operating at different voltage potentials, such as high‑voltage and low‑voltage systems, is essential. In addition, there is growing demand for highly reliable isolation devices that can maintain stable operation even in noisy environments. As equipment continues to become more compact, isolation devices are also required more than ever to offer smaller size, higher reliability, and longer service life.
Meanwhile, reducing overall system power consumption has become an important challenge in achieving carbon neutrality, and there is growing demand for lower power consumption in isolation devices as well.

The new products use Toshiba’s proprietary magnetic coupling isolation transmission technology[4] to meet market requirements for high reliability and long service life. In addition, by incorporating Toshiba’s newly developed proprietary circuit technology in the isolation signal transmission section, they achieve low power consumption of 0.2mA per channel while maintaining stable data transmission at speeds of up to 25Mbps (max).
The new products are also rated for an isolation voltage of 3000Vrms (min) and operate over a wide operating temperature range of –40 to 125°C and a wide supply voltage range of 2.25 to 5.5V.
These features contribute to stable equipment operation and low power consumption.
The adoption of an industry‑standard small SSOP16 package addresses the demand for compact designs.

The new products feature a quad‑channel configuration with three forward channels and one reverse channel, making them suitable for multi‑channel communication systems such as SPI[5]-based I/O interfaces.

Toshiba is mass‑producing the "DCL54xx01A Series" and the "DCL52xx00 Series" as standard digital isolators for industrial equipment supporting high‑speed data communication, as well as the "DCM34xx01 Series" and the "DCM32xx00 Series" as standard digital isolators for automotive applications, enabling customers to select products according to application requirements.

Toshiba will continue to expand its lineup of digital isolators for industrial and automotive equipment by broadening channel count and package options and by pursuing further performance improvements to contribute to the realization of carbon neutrality. Together with optically coupled isolators such as photocouplers, Toshiba will provide high‑quality isolation devices that support stable operation in communication and control systems requiring electrical isolation.

Notes:
[1] Calculated using 1Mbps operating current value, derived from (IDD1+IDD2) divided by four channels.
      Measurement conditions: VDD1=VDD2=3.3V,  data transmission rate tbps=1Mbps, CL=15pF, Ta=25°C
[2] Communication speed range of up to 25Mbps
[3] Default output logic indicates which logic level the output pin of a digital isolator holds as its initial state when the input signal is undefined, such as immediately after power‑on or when the input is floating.
[4] A signal transmission method that integrates a modulation chip and a demodulation chip with insulation layers into a single package and transmits signals using a magnetic field.
[5] SPI (Serial Peripheral Interface): A synchronous serial communication method that transmits and receives data in synchronization with a clock signal.

Features

  1. Low operating current consumption
  2. Adoption of an industry‑standard small package

Features Explanation

1. Low operating current

Figure 1. Comparison of operating current per channel between the DCL541x01A Series and the new products
Figure 1. Comparison of operating current per channel between the DCL541x01A Series and the new products

The DCL341x0B series achieves a low current consumption of 0.2mA per channel by adopting a new proprietary circuitry technique in the isolated signal‑transmission section. This contributes to reduced power consumption in industrial equipment. In addition, compared with the existing high‑speed digital isolator DCL541x01A Series, the operating current per channel is approximately 95% lower[1].

2. Adoption of an industry‑standard small package

Figure 2. Comparison of package dimensions between SOIC16‑W and SSOP16
Figure 2. Comparison of package dimensions between SOIC16‑W and SSOP16

The DCL341x0B Series adopts an industry‑standard small SSOP16 package that offers mounting compatibility for industrial equipment. This contributes to optimized board layout through miniaturization and supports multi‑sourcing by using a standard package. In addition, compared with the SOIC16‑W package used in Toshiba’s existing products, the package mounting area is approximately 72% smaller[6].

Figure 3. Comparison of package mounting area between SOIC16‑W and SSOP16
Figure 3. Comparison of package mounting area between SOIC16‑W and SSOP16

Note:
[6] SOIC16W package size: 10.3×10.3×2.65mm (typ.), SSOP16 package size: 4.9×6.0×1.75mm (typ.)

Applications

  • Industrial automation (programmable logic controllers (PLCs), I/O interfaces, etc.)
  • Field equipment (sensors, actuators, etc.)
  • Motor control
  • Inverters
  • Switching power supply

Main Specifications

Part number DCL341L0B DCL341H0B
Number of channels
(Forward directions: reverse directions)		 4
(3:1)		 4
(3:1)
Default output logic Low High
Package P-SSOP16-0405-0.64-001
Absolute
maximum
ratings		 Operating temperature Topr (°C) -40 to 125
Storage temperature Tstg (°C) -65 to 150
Isolation voltage (1min.) BVS (Vrms) Ta=25°C Min 3000
Recommended
operating
conditions		 Power supply voltage VDD1 (V) Topr=-40 to 125°C 2.25 to 5.5
Power supply voltage VDD2 (V) 2.25 to 5.5
Electrical
characteristics		 1Mbps operating current Primary-side supply
current IDD1(1) (mA)		 VDD1=VDD2=3.3V,
fCLK=500kHz,
duty=50% cycle
square wave, CL=15
pF, Ta=25°C		 Typ. 0.35 0.35
Secondary-side supply
current IDD2(1) (mA)		 0.445 0.445
25Mbps operating current Primary-side supply
current IDD1(25) (mA)		 VDD1=VDD2=3.3V,
fCLK=12.5MHz,
duty=50% cycle
square wave, CL=15
pF, Ta=25°C		 Typ. 6.5 6.5
Secondary-side supply
current IDD2(25) (mA)		 5.8 5.8
Data rate
tbps (Mbps)		 VDD1=VDD2=2.25 to 5.5V,
Ta=-40 to 125°C		 Max 25 25
Propagation delay
tPHL, tPLH (ns)		 VDD1=VDD2=3.3V,
50kHz, Duty=50%,
tr=tf=2ns, Ta=25°C		 Max 52 52
Common mode transient
immunity |CMTI| (kV/μs)		 VDD1=VDD2=3.3V,
VI=VDDI or 0V,
VCM=400V, Ta=25°C		 Min 30 30
Sample check & availability Buy Online Buy Online

Related Contents

Follow the links below for more on the new product.
DCL341L0B
DCL341H0B

Follow the link below for more on Toshiba’s Isolators/Solid State Relays.
Isolators/Solid State Relays

To check availability of the new products at online distributors, visit:
DCL341L0B
DCL341H0B

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