TIC253D-S Equivalent & Substitute Parts

Part Overview

The TIC253D-S is a standard TRIAC manufactured by Bourns Inc., rated for 400V off-state voltage and 20A on-state current in a through-hole SOT-93 package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The TIC253D-S serves as a general-purpose thyristor for AC switching applications requiring moderate current handling and voltage isolation.

Key Parameters

Parameter	Value
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	20 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Non Rep. Surge 50, 60Hz (Itsm)	150A @ 50Hz
Current - Gate Trigger (Igt) (Max)	50 mA
Current - Hold (Ih) (Max)	40 mA
Operating Temperature Range	-40°C ~ 110°C (TC)
Mounting Type	Through Hole
Package / Case	TO-218-3 (SOT-93)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TIC253D-S is determined by the following critical parameters:

Voltage - Off State: Must equal or exceed 400V to maintain voltage isolation capability
Current - On State (It (RMS)): Must meet or exceed 20A to handle the same load current
Gate Trigger Parameters (Vgt, Igt): Must be compatible with existing gate drive circuitry
Current - Non Rep. Surge (Itsm): Must support 150A surge current at 50Hz or 60Hz
Current - Hold (Ih): Must not exceed circuit holding current requirements
Operating Temperature Range: Must cover the application's thermal operating window
Mounting Type & Package: Through-hole compatibility required for PCB integration

The MAC16DG from onsemi qualifies as a substitute based on matching voltage and surge current specifications, though with reduced on-state current rating (16A vs. 20A). This reduction requires circuit-level evaluation for applications demanding the full 20A capacity.

Parameter Comparison

Parameter	TIC253D-S (Bourns)	MAC16DG (onsemi)
Voltage - Off State	400 V	400 V
Current - On State (It (RMS)) (Max)	20 A	16 A
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.5 V
Current - Non Rep. Surge 50, 60Hz (Itsm)	150A @ 50Hz	150A @ 60Hz
Current - Gate Trigger (Igt) (Max)	50 mA	50 mA
Current - Hold (Ih) (Max)	40 mA	50 mA
Operating Temperature Range	-40°C ~ 110°C (TC)	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-218-3 (SOT-93)	TO-220-3 (TO-220AB)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MAC16DG represents an active-status alternative to the obsolete TIC253D-S. Both components share identical 400V off-state voltage and 150A surge current specifications, ensuring compatibility in voltage isolation and transient protection requirements.

Key differences affecting selection:

On-State Current: The MAC16DG is rated for 16A versus the TIC253D-S at 20A. Applications operating at or below 16A RMS current can use the MAC16DG without derating. Applications requiring the full 20A capacity must evaluate whether 16A operation is acceptable or if alternative components with higher current ratings are necessary.
Gate Trigger Voltage: The MAC16DG exhibits a lower maximum gate trigger voltage (1.5V vs. 2V), requiring less gate drive power. This may improve gate drive circuit efficiency but requires verification that existing gate drive circuitry can reliably trigger the lower threshold.
Operating Temperature: The MAC16DG supports -40°C to 125°C (junction temperature) versus -40°C to 110°C (case temperature) for the TIC253D-S. The MAC16DG provides extended high-temperature operation.
Package Transition: The MAC16DG uses TO-220AB packaging versus the TIC253D-S SOT-93 package. PCB layout modifications are required to accommodate the different footprint and lead spacing.
Compliance: Both components carry ROHS3 compliance and EAR99 export classification, maintaining regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can the MAC16DG directly replace the TIC253D-S without circuit modification?

A: Physical replacement requires PCB layout changes due to different package types (TO-220AB vs. SOT-93). Electrical compatibility depends on application current requirements. If the circuit operates at 16A or below, the MAC16DG is electrically compatible. Applications requiring sustained 20A operation must evaluate whether reduced current capacity is acceptable.

Q: What is the impact of the lower gate trigger voltage on the MAC16DG?

A: The MAC16DG requires a maximum of 1.5V gate trigger voltage compared to 2V for the TIC253D-S. This lower threshold reduces gate drive power requirements. Existing gate drive circuits must be verified to reliably trigger at or below 1.5V to ensure consistent device operation.

Q: Are there thermal considerations when switching from TIC253D-S to MAC16DG?

A: The MAC16DG supports operation to 125°C junction temperature versus 110°C case temperature for the TIC253D-S. The MAC16DG provides improved thermal margin in high-temperature environments. However, the reduced on-state current rating (16A vs. 20A) may result in different power dissipation characteristics depending on application load current.

Q: What are the package and mounting differences?

A: The TIC253D-S uses a TO-218-3 (SOT-93) through-hole package, while the MAC16DG uses a TO-220-3 (TO-220AB) through-hole package. Both are through-hole mounted, but lead spacing and footprint dimensions differ significantly. PCB redesign is required for the MAC16DG installation.

Q: Is the MAC16DG suitable for 50Hz and 60Hz applications?

A: Yes. The MAC16DG is rated for 150A non-repetitive surge current at 60Hz. The TIC253D-S is rated at 50Hz. Both components function across standard AC line frequencies; the surge rating specification reflects the test condition rather than a frequency limitation.

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