MAC228A4 TRIAC Equivalent & Substitute Parts

Part Overview

The MAC228A4 is a logic-sensitive gate TRIAC manufactured by onsemi, rated for 200 V off-state voltage and 8 A on-state current in a TO-220AB through-hole package. The product is currently obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new designs requiring similar functionality.

Substitution becomes necessary when the original part reaches end-of-life status or when design requirements allow for alternative voltage ratings or performance characteristics within the same functional category.

Key Parameters

Parameter	Value
Triac Type	Logic - Sensitive Gate
Voltage - Off State	200 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	15 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80 A @ 60Hz
Operating Temperature	-40°C ~ 110°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3
Supplier Device Package	TO-220AB
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution logic for the MAC228A4 is based on the following criteria:

Direct Equivalent (Identical Electrical and Mechanical Parameters):

MAC228A4G: Identical specifications with active product status and bulk packaging availability

Similar Substitutes (Voltage Rating Upgrade with Maintained Current Rating):

BT137-600D,127 (WeEn Semiconductors): 600 V off-state voltage, 8 A on-state current, same gate trigger characteristics, TO-220AB package
BTB08-600SRG (STMicroelectronics): 600 V off-state voltage, 8 A on-state current, TO-220 package
BTB08-600SWRG (STMicroelectronics): 600 V off-state voltage, 8 A on-state current, TO-220 package

All substitute parts maintain the 8 A on-state current rating, logic-sensitive gate configuration, and through-hole TO-220 family packaging. Voltage rating differences allow for higher-voltage circuit applications while preserving current-handling capability.

Parameter Comparison

Parameter	MAC228A4	MAC228A4G	BT137-600D,127	BTB08-600SRG	BTB08-600SWRG
Manufacturer	onsemi	onsemi	WeEn Semiconductors	STMicroelectronics	STMicroelectronics
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	200 V	200 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	8 A	8 A	8 A	8 A	8 A
Voltage - Gate Trigger (Vgt) (Max)	2 V	2 V	1.5 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	5 mA	10 mA	10 mA
Current - Hold (Ih) (Max)	15 mA	15 mA	10 mA	15 mA	15 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	80 A @ 60Hz	80 A @ 60Hz	65 A, 71 A	80 A, 84 A	80 A, 84 A
Operating Temperature	-40°C ~ 110°C (TJ)	-40°C ~ 110°C (TJ)	125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAC228A4G is the primary direct replacement for MAC228A4. Both parts share identical electrical specifications and TO-220AB packaging. MAC228A4G maintains active product status with significantly higher inventory availability (12,724 pcs vs. 709 pcs), ensuring supply chain continuity.

BT137-600D,127, BTB08-600SRG, and BTB08-600SWRG are suitable for applications where higher off-state voltage tolerance is acceptable. These 600 V rated alternatives provide design margin for circuits operating below 200 V while maintaining 8 A current capacity. All three alternatives carry ROHS3 compliance certification, addressing environmental regulatory requirements that the obsolete MAC228A4 does not meet.

Selection between STMicroelectronics options (BTB08-600SRG and BTB08-600SWRG) depends on gate trigger current requirements. Both parts specify 10 mA maximum gate trigger current compared to the original 5 mA specification. BTB08-600SWRG offers higher inventory availability (10,399 pcs) relative to BTB08-600SRG (3,500 pcs).

Frequently Asked Questions (FAQ)

Q: Can MAC228A4G be used as a direct drop-in replacement for MAC228A4?

A: Yes. MAC228A4G is electrically and mechanically identical to MAC228A4, with identical voltage, current, and thermal specifications. Both use TO-220AB packaging with identical pin configuration. The primary difference is product status: MAC228A4G is active while MAC228A4 is obsolete.

Q: What is the key difference between the 200 V MAC228A4 and the 600 V substitute options?

A: The 600 V rated parts (BT137-600D,127, BTB08-600SRG, BTB08-600SWRG) have higher off-state voltage capability, allowing operation in higher-voltage circuits. On-state current rating remains 8 A across all options. Selection depends on the maximum voltage the TRIAC must block in the target application.

Q: Are the STMicroelectronics BTB08-600 variants pin-compatible with MAC228A4?

A: Yes. All parts use TO-220-3 package configuration with identical pin assignments for gate, main terminal 1, and main terminal 2. Physical mounting and electrical connection are compatible.

Q: What is the significance of the gate trigger current difference between MAC228A4 (5 mA max) and BTB08-600 variants (10 mA max)?

A: Gate trigger current specification defines the maximum current required to reliably trigger the TRIAC. The BTB08-600 variants require up to 10 mA compared to 5 mA for MAC228A4. Gate drive circuits must supply sufficient current to meet this specification. Existing designs with marginal gate drive capability may require circuit adjustment.

Q: Do all substitute parts meet RoHS compliance requirements?

A: MAC228A4G compliance status is not specified in available data. BT137-600D,127, BTB08-600SRG, and BTB08-600SWRG are all ROHS3 compliant. The original MAC228A4 is RoHS non-compliant. Compliance verification is necessary for applications subject to environmental regulations.

Q: What inventory considerations apply to these substitutes?

A: MAC228A4G offers the highest inventory (12,724 pcs) for direct replacement. Among 600 V alternatives, BTB08-600SWRG (10,399 pcs) provides superior availability compared to BTB08-600SRG (3,500 pcs) and BT137-600D,127 (994 pcs). Supply chain planning should account for these availability differences.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message