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ACTT4S-800C,118 Equivalent & Substitute Parts
Part Overview
The ACTT4S-800C,118 is a standard TRIAC thyristor rated for 800V off-state voltage and 4A on-state current, manufactured by WeEn Semiconductors in Surface Mount DPAK packaging. This component is designed for AC switching applications requiring reliable gate triggering and thermal performance up to 125°C junction temperature. The part is Active status and RoHS Compliant, making it suitable for modern industrial and consumer electronics applications. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the DPAK form factor.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Off State | 800 | V |
| Current - On State (It RMS) Max | 4 | A |
| Voltage - Gate Trigger (Vgt) Max | 1 | V |
| Current - Gate Trigger (Igt) Max | 35 | mA |
| Current - Hold (Ih) Max | 35 | mA |
| Operating Temperature (TJ) | 125 | °C |
| Package / Case | TO-252-3, DPAK (2 Leads + Tab), SC-63 | — |
| Triac Type | Standard | — |
| Configuration | Single | — |
Substitute Part Grouping Explanation
Substitute parts for the ACTT4S-800C,118 are classified into two categories based on electrical and functional compatibility:
Direct Electrical Equivalents (Standard TRIAC Type): Parts matching the 800V / 4A rating with Standard TRIAC characteristics. These parts maintain identical voltage and current ratings with compatible gate trigger parameters. Substitutes in this group include MAC4DCNT4G (Littelfuse), ACST435-8B, ACST435-8BTR (STMicroelectronics), and Q8004D4RP (Littelfuse). All are housed in TO-252-3 DPAK packaging with single configuration.
Functional Alternatives (Logic - Sensitive Gate TRIAC Type): Parts with 800V / 4A ratings but featuring Logic - Sensitive Gate characteristics. These parts have lower gate trigger current requirements (5–10 mA versus 35 mA) and reduced hold current, suitable for applications requiring lower gate drive power. Substitutes include ACST410-8BTR (STMicroelectronics), MAC4DSNT4G (Littelfuse), and T405-800B-TR, T410-800B-TR (STMicroelectronics).
Non-Equivalent Part (Higher Current Rating): Q8008DH4RP is an 8A Alternistor - Snubberless TRIAC. While it shares the 800V rating and DPAK package, the 8A current rating and Alternistor type make it unsuitable as a direct substitute for 4A applications.
Substitution eligibility is determined by: (1) matching 800V off-state voltage, (2) matching or exceeding 4A on-state current rating, (3) compatible DPAK packaging, and (4) gate trigger parameters within acceptable application tolerances.
Parameter Comparison
| Part Number | Manufacturer | Triac Type | Voltage - Off State (V) | Current - On State Max (A) | Vgt Max (V) | Igt Max (mA) | Ih Max (mA) | Operating Temp (°C) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| ACTT4S-800C,118 | WeEn Semiconductors | Standard | 800 | 4 | 1 | 35 | 35 | 125 | TO-252-3 DPAK | RoHS Compliant |
| MAC4DCNT4G | Littelfuse Inc. | Standard | 800 | 4 | 1.3 | 35 | 35 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
| ACST410-8BTR | STMicroelectronics | Logic - Sensitive Gate | 800 | 4 | 1 | 10 | 20 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
| ACST435-8B | STMicroelectronics | Standard | 800 | 4 | 1.1 | 35 | 25 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
| ACST435-8BTR | STMicroelectronics | Standard | 800 | 4 | 1.1 | 35 | 25 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
| MAC4DSNT4G | Littelfuse Inc. | Logic - Sensitive Gate | 800 | 4 | 1.3 | 10 | 15 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
| Q8004D4RP | Littelfuse Inc. | Standard | 800 | 4 | 1.3 | 25 | 30 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
| T405-800B-TR | STMicroelectronics | Logic - Sensitive Gate | 800 | 4 | 1.3 | 5 | 10 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
| T410-800B-TR | STMicroelectronics | Logic - Sensitive Gate | 800 | 4 | 1.3 | 10 | 15 | -40 to 125 | TO-252-3 DPAK | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Standard TRIAC Type): MAC4DCNT4G, ACST435-8B, ACST435-8BTR, and Q8004D4RP are electrically equivalent to ACTT4S-800C,118 for applications requiring Standard TRIAC characteristics. All substitute parts are ROHS3 Compliant and Active status. MAC4DCNT4G and Q8004D4RP offer extended operating temperature range (-40°C to 125°C) compared to the main part specification (125°C maximum). ACST435-8B and ACST435-8BTR are available in higher inventory quantities and support extended temperature operation.
For Sensitive Gate Applications: ACST410-8BTR, MAC4DSNT4G, T405-800B-TR, and T410-800B-TR are suitable where reduced gate drive current is required. These Logic - Sensitive Gate TRIACs reduce gate trigger current from 35 mA to 5–10 mA, lowering power consumption in gate drive circuits. T405-800B-TR offers the lowest gate trigger current specification (5 mA maximum). All sensitive gate alternatives maintain 800V / 4A ratings and DPAK packaging compatibility.
Compliance and Availability: All substitute parts maintain RoHS3 compliance and Active product status. Littelfuse parts (MAC4DCNT4G, MAC4DSNT4G, Q8004D4RP) show higher inventory availability. STMicroelectronics parts (ACST410-8BTR, ACST435-8B, ACST435-8BTR, T405-800B-TR, T410-800B-TR) are available in multiple packaging formats (Tube, Cut Tape, Digi-Reel).
Frequently Asked Questions (FAQ)
Q: Can MAC4DCNT4G replace ACTT4S-800C,118 directly? A: Yes. MAC4DCNT4G is a Standard TRIAC with identical 800V / 4A ratings, matching gate trigger voltage (1.3V maximum versus 1V), and identical gate trigger current (35 mA). Both use TO-252-3 DPAK packaging. The primary difference is extended operating temperature range (-40°C to 125°C for MAC4DCNT4G).
Q: What is the difference between Standard and Logic - Sensitive Gate TRIAC types? A: Standard TRIACs require higher gate trigger current (typically 25–35 mA) for reliable switching. Logic - Sensitive Gate TRIACs reduce this requirement to 5–10 mA, enabling lower gate drive power consumption. Both types maintain the same 800V / 4A electrical ratings. Selection depends on gate drive circuit design and power budget requirements.
Q: Are all substitute parts compatible with the DPAK footprint? A: Yes. All listed substitute parts use TO-252-3 DPAK (2 Leads + Tab) packaging, ensuring mechanical and thermal compatibility with existing PCB layouts designed for ACTT4S-800C,118.
Q: Which substitute offers the lowest gate trigger current? A: T405-800B-TR (STMicroelectronics) specifies 5 mA maximum gate trigger current, the lowest among all substitutes. This part is classified as Logic - Sensitive Gate type and is suitable for applications requiring minimal gate drive power.
Q: Is Q8008DH4RP a suitable substitute? A: No. Q8008DH4RP is rated for 8A on-state current and features Alternistor - Snubberless characteristics, making it unsuitable for 4A applications. It is not a direct equivalent.
Q: What is the inventory status of substitute parts? A: MAC4DCNT4G (Littelfuse) shows the highest inventory at 40,600 pieces. ACST410-8BTR (STMicroelectronics) has 8,630 pieces. T410-800B-TR has 7,900 pieces. Availability varies by distributor and packaging format (Tape & Reel, Cut Tape, Tube).
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