ISO7421E
Digital IsolatorThe ISO7421E is a digital isolator from Texas Instruments. View the full ISO7421E datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Digital Isolator
Package
SOIC (8)
Overview
Part: ISO742x — Texas Instruments
Type: Low-Power Dual Channel Digital Isolator
Description: The ISO742x is a dual-channel digital isolator providing galvanic isolation up to 2500 VRMS (UL 1577) and 4242 VPK (VDE) with signaling rates greater than 50 Mbps, low propagation delay of 7 ns typical, and operating from 3-V to 5.5-V supply levels.
Operating Conditions:
- Supply voltage: 3–5.5 V
- Operating temperature: -40 to 125 °C
- Signaling rate: 0–50 Mbps
Absolute Maximum Ratings:
- Max supply voltage: 6 V
- Max continuous current: ±15 mA
- Max junction/storage temperature: 150 °C
Key Specs:
- High-level output voltage (IOH = -4 mA): VCCO - 0.8 V (min), 4.6 V (typ)
- Low-level output voltage (IOL = 4 mA): 0.2 V (typ), 0.4 V (max)
- Input threshold voltage hysteresis: 400 mV (typ)
- High-level input current: 10 μA (max)
- Low-level input current: -10 μA (min)
- Common-mode transient immunity: 25 kV/μs (min), 50 kV/μs (typ)
- Supply current for VCC1 (DC to 1 Mbps, CL = 15 pF): 0.4 mA (typ), 0.8 mA (max)
- Supply current for VCC2 (DC to 1 Mbps, CL = 15 pF): 3.4 mA (typ), 5 mA (max)
Features:
- Signaling Rate > 50 Mbps
- Default Output 'High' and 'Low' Options
- Low Power Consumption: Typical ICC per Channel (3.3-V Supplies): ISO7420: 1.4 mA at 1 Mbps, 2.5 mA at 25 Mbps; ISO7421: 1.8 mA at 1 Mbps, 2.8 mA at 25 Mbps
- Low Propagation Delay: 7 ns Typical
- Low Pulse Skew: 200 ps Typical
- 50-KV/μs Transient Immunity, Typical
- Isolation Barrier Life: > 25 Years
- 3.3-V and 5-V Level Translation
- Safety and Regulatory Approvals: 4242 VPK Isolation per DIN V VDE V 0884-10 and DIN EN 61010-1; 2500 VRMS Isolation for 1 minute per UL 1577; CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards; CQC Certification per GB4943.1-2011
Applications:
- Opto-Coupler Replacement in: Industrial FieldBus, ProfiBus, ModBus, DeviceNet™ Data Buses, Servo Control Interface, Motor Control, Power Supplies, Battery Packs
Package:
- SOIC (8) (4.90 mm x 3.91 mm)
Features
-
1 · Signaling Rate > 50 Mbps
-
Default Output 'High' and 'Low' Options
-
Low Power Consumption: Typical ICC per Channel (3.3-V Supplies):
-
-ISO7420: 1.4 mA at 1 Mbps, 2.5 mA at 25 Mbps
-
-ISO7421: 1.8 mA at 1 Mbps, 2.8 mA at 25 Mbps
-
Low Propagation Delay: 7 ns Typical
-
Low Pulse Skew: 200 ps Typical
-
Wide TA Range Specified: -40°C to 125°C
-
50-KV/ μ s Transient Immunity, Typical
-
Isolation Barrier Life: > 25 Years
-
Operates from 3-V to 5.5-V Supply Levels
-
3.3-V and 5-V Level Translation
-
Narrow Body SOIC-8 Package
-
Safety and Regulatory Approvals:
-
-4242 VPK Isolation per DIN V VDE V 0884-10 and DIN EN 61010-1
-
-2500 VRMS Isolation for 1 minute per UL 1577
-
-CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards
-
-CQC Certification per GB4943.1-2011
Applications
- Opto-Coupler Replacement in:
- -Industrial FieldBus
- -ProfiBus
- -ModBus
- -DeviceNet™ Data Buses
- -Servo Control Interface
- -Motor Control
- -Power Supplies
- -Battery Packs
Pin Configuration
Electrical Characteristics
TA = -40°C to 125°C
| PARAMETER | PARAMETER | TEST | CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|---|
| V OH | High-level output voltage | I OH = -4 mA; see Figure 16. | I OH = -4 mA; see Figure 16. | V CCO (1) - 0.8 | 4.6 | V | |
| V OH | High-level output voltage | I OH = -20 μ A; see Figure 16. | I OH = -20 μ A; see Figure 16. | V CCO - 0.1 | 5 | V | |
| V OL | Low-level output voltage | I OL = 4 mA; see Figure 16. | I OL = 4 mA; see Figure 16. | 0.2 | 0.4 | V | |
| V OL | Low-level output voltage | I OL = 20 μ A; see Figure 16. | I OL = 20 μ A; see Figure 16. | 0 | 0.1 | V | |
| V I(HYS) | Input threshold voltage hysteresis | 400 | mV | ||||
| I IH | High-level input current | 10 | μ A | ||||
| I IL | Low-level input current | CCI (1) | CCI (1) | -10 | μ A | ||
| CMTI | Common-mode transient immunity | V I = V CCI or 0 V; see Figure 18. | V I = V CCI or 0 V; see Figure 18. | 25 | 50 | kV/ μ s | |
| SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) | SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) | SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) | SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) | SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) | SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) | SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) | SUPPLY CURRENT (ALL INPUTS SWITCHING WITH SQUARE WAVE CLOCK SIGNAL FOR DYNAMIC I CC MEASUREMENT) |
| ISO7420x | ISO7420x | ISO7420x | ISO7420x | ISO7420x | ISO7420x | ISO7420x | ISO7420x |
| I CC1 | Supply current for V CC1 and V CC2 | DC to 1 Mbps | DC Input: V I = V CCI or 0 V, AC Input: C L = 15 pF | 0.4 | 0.8 | mA | |
| I CC2 | Supply current for V CC1 and V CC2 | DC to 1 Mbps | DC Input: V I = V CCI or 0 V, AC Input: C L = 15 pF | 3.4 | 5 | mA | |
| I CC1 | Supply current for V CC1 and V CC2 | 10 Mbps | C = 15 pF | 0.6 | 1 | mA | |
| I CC2 | Supply current for V CC1 and V CC2 | 10 Mbps | C = 15 pF | 4.5 | 6 | mA | |
| I CC1 | Supply current for V CC1 and V CC2 | 25 Mbps | C = 15 pF | 1 | 1.5 | mA | |
| I CC2 | Supply current for V CC1 and V CC2 | L | C = 15 pF | 6.2 | 8 | mA | |
| I CC1 | Supply current for V CC1 and V CC2 | 50 Mbps | 1.7 | 2.5 | mA | ||
| I CC2 | Supply current for V CC1 and V CC2 | 50 Mbps | 9 | 12 | mA | ||
| ISO7421x | ISO7421x | ISO7421x | ISO7421x | ISO7421x | ISO7421x | ISO7421x | ISO7421x |
| I CC1 | Supply current for V CC1 and V CC2 | DC to 1 Mbps | DC Input: V I = V CCI or 0 V, AC Input: C L = 15 pF | 2.3 | 3.6 | mA | |
| I CC2 | Supply current for V CC1 and V CC2 | DC to 1 Mbps | DC Input: V I = V CCI or 0 V, AC Input: C L = 15 pF | 2.3 | 3.6 | mA | |
| I CC1 | Supply current for V CC1 and V CC2 | 10 Mbps | C L = 15 pF | 2.9 | 4.5 | mA | |
| I CC2 | Supply current for V CC1 and V CC2 | 10 Mbps | C L = 15 pF | 2.9 | 4.5 | mA | |
| I CC1 | Supply current for V CC1 and V CC2 | 25 Mbps | 4.3 | 6 | mA | ||
| I CC2 | Supply current for V CC1 and V CC2 | 25 Mbps | 4.3 | 6 | mA | ||
| I CC1 | Supply current for V CC1 and V CC2 | 50 Mbps | 6 | 8.5 | mA | ||
| I CC2 | Supply current for V CC1 and V CC2 | 50 Mbps | 6 | 8.5 | mA |
Absolute Maximum Ratings
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| V CC | Supply voltage (2) , V CC1 , V CC2 | -0.5 | 6 | V |
| V I | Voltage at IN, OUT | -0.5 | V CC + 0.5 (3) | V |
| I O | Output current | ±15 | mA | |
| V SRG | Maximum surge immunity - Supports IEC 61000-4-5 | 4000 | V PK | |
| T J(Max) | Maximum junction temperature | 150 | °C | |
| T stg | Storage temperature | -65 | 150 | °C |
Recommended Operating Conditions
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| V CC1 , V CC2 | Supply voltage | 3 | 5.5 | V | |
| I OH | High-level output current | -4 | mA | ||
| I OL | Low-level output current | 4 | mA | ||
| V IH | High-level input voltage | 2 | 5.5 | V | |
| V IL | Low-level input voltage | 0 | 0.8 | V | |
| t ui | Input pulse duration | 20 | ns | ||
| 1 / t ui | Signaling rate | 0 | 50 (1) | Mbps | |
| T J (2) | Junction temperature | -40 | 136 | °C | |
| T A | Ambient Temperature | -40 | 25 | 125 | °C |
Thermal Information
| THERMAL METRIC (1) | ISO742x D (SOIC) | UNIT | ||
|---|---|---|---|---|
| Low-K board | 8 PINS | |||
| High-K board | 116.6 | °C/W | ||
| R θ JC(top) | Junction-to-case (top) thermal resistance | Junction-to-case (top) thermal resistance | 71.6 | °C/W |
| R θ JB | Junction-to-board thermal resistance | Junction-to-board thermal resistance | 57.3 | °C/W |
| ψ JT | Junction-to-top characterization parameter | Junction-to-top characterization parameter | 28.3 | °C/W |
| ψ JB | Junction-to-board characterization parameter | Junction-to-board characterization parameter | 56.8 | °C/W |
Typical Application
ISO742x utilize single-ended TTL-logic switching technology. Its supply voltage range is from 3 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, it is important to keep in mind that due to the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data controller (i.e. μ C or UART), and a data converter or a line transceiver, regardless of the interface type or standard.
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| ISO7420E | Texas Instruments | — |
| ISO7420FE | Texas Instruments | — |
| ISO7421 | Texas Instruments | — |
| ISO7421E-Q1 | Texas Instruments | — |
| ISO7421ED | Texas Instruments | — |
| ISO7421EDR | Texas Instruments | SOIC-8 |
| ISO7421FCC | Texas Instruments | — |
| ISO7421FE | Texas Instruments | SOIC (8) |
| ISO7421FED | Texas Instruments | — |
| ISO7421FEDR | Texas Instruments | — |
| ISO7421X | Texas Instruments | — |
| ISO742X | Texas Instruments | — |
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