ACPL-M43T Optoisolator Equivalent & Substitute Parts

Part Overview

The ACPL-M43T is a 4000Vrms optoisolator with transistor output manufactured by Broadcom Limited in the R²Coupler™ series. This single-channel device operates in the automotive grade with AEC-Q100 qualification and is actively produced. The part is housed in a 5-SO package (6-SOIC 0.173", 4.40mm width) and designed for DC input applications requiring high isolation voltage and fast switching performance.

Substitute parts are necessary when the primary part experiences supply constraints, when alternative packaging formats are required for manufacturing processes, or when design flexibility permits operation within relaxed electrical parameters while maintaining functional compatibility.

Key Parameters

Parameter	Value	Unit
Isolation Voltage	4000	Vrms
Number of Channels	1	—
Current Transfer Ratio (Min)	32	% @ 10mA
Current Transfer Ratio (Max)	100	% @ 10mA
Turn On Time (Typ)	150	ns
Turn Off Time (Typ)	500	ns
Output Type	Transistor	—
Voltage - Output (Max)	20	V
Current - Output / Channel	8	mA
Voltage - Forward (Vf) (Typ)	1.55	V
Current - DC Forward (If) (Max)	20	mA
Operating Temperature	-40 to 125	°C
Mounting Type	Surface Mount	—
Package / Case	6-SOIC (0.173", 4.40mm Width), 5 Leads	—
Grade	Automotive	—
Qualification	AEC-Q100	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Criteria:

Single-channel transistor output optoisolator architecture
Surface mount package with 5-lead configuration (6-SOIC 0.173", 4.40mm width)
DC input type
Output voltage rating of 20V minimum
Output current capability of 8mA per channel minimum
Forward voltage (Vf) in the range of 1.55V to 1.7V
DC forward current (If) rating of 20mA minimum

Isolation Voltage Consideration: The ACPL-M43T operates at 4000Vrms isolation. Substitute parts with 3750Vrms isolation voltage are functionally compatible in applications where the lower isolation rating satisfies system requirements. Parts with lower isolation voltage do not reduce functionality in circuits designed for 4000Vrms operation; they represent a relaxation of the isolation specification.

Switching Speed Consideration: The ACPL-M43T specifies turn-on/turn-off times of 150ns/500ns. Substitute parts with turn-on/turn-off times up to 500ns/600ns are compatible with applications tolerant of slightly extended switching delays.

Temperature Range Consideration: The ACPL-M43T operates from -40°C to 125°C. Substitute parts with reduced upper temperature limits (-40°C to 85°C) are compatible in applications where the operating environment does not exceed 85°C.

RoHS and Compliance Consideration: The ACPL-M43T is RoHS non-compliant. Substitute parts with ROHS3 compliance are functionally equivalent and offer improved environmental compliance for new designs.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage (Vrms)	CTR Min (% @ mA)	CTR Max (% @ mA)	Ton/Toff (ns)	Vf (V)	If Max (mA)	Temp Range (°C)	RoHS Status	Packaging
ACPL-M43T	Broadcom Limited	4000	32 @ 10	100 @ 10	150/500	1.55	20	-40 to 125	Non-compliant	5-SO
ACPL-M43T-000E	Broadcom Limited	4000	32 @ 10	100 @ 10	150/500	1.55	20	-40 to 125	ROHS3 Compliant	Tube
FODM452	onsemi	3750	20 @ 16	50 @ 16	400/350	1.6	25	-40 to 85	ROHS3 Compliant	Bulk
FODM452R2	onsemi	3750	20 @ 16	50 @ 16	400/350	1.6	25	-40 to 85	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
FODM452R2V	onsemi	3750	20 @ 16	50 @ 16	400/350	1.6	25	-40 to 85	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
FODM453	onsemi	3750	20 @ 16	50 @ 16	400/350	1.6	25	-40 to 85	ROHS3 Compliant	Tube
FODM453R2	onsemi	3750	20 @ 16	50 @ 16	400/350	1.6	25	-40 to 85	ROHS3 Compliant	Tape & Reel (TR)
FODM453R2V	onsemi	3750	20 @ 16	50 @ 16	400/350	1.6	25	-40 to 85	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
PC457L0NIP0F	SHARP/Socle Technology	3750	19 @ 16	50 @ 16	200/400	1.7	25	-55 to 85	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
PC457L0YIP0F	SHARP/Socle Technology	3750	19 @ 16	50 @ 16	200/400	1.7	25	-55 to 85	RoHS Compliant	Tape & Reel (TR)
PS8101-AX	Renesas Electronics Corporation	3750	15 @ 16	35 @ 16	500/600	1.7	25	-55 to 100	ROHS3 Compliant	Strip

Engineering Selection Recommendations

Direct Equivalent (Identical Electrical Performance): ACPL-M43T-000E is the direct equivalent, differing only in packaging format (Tube vs. standard packaging) and RoHS compliance status. This part maintains identical electrical specifications and automotive qualification. Selection is based on packaging requirements and RoHS compliance mandates.

Functional Substitutes (3750Vrms Isolation Group): The onsemi FODM452 series (FODM452, FODM452R2, FODM452R2V, FODM453, FODM453R2, FODM453R2V) and SHARP PC457L0 series (PC457L0NIP0F, PC457L0YIP0F) operate at 3750Vrms isolation voltage. These parts are functionally compatible in applications where the reduced isolation specification is acceptable. All substitute parts in this group carry ROHS3 compliance. Selection among these variants is determined by packaging format requirements (Bulk, Cut Tape & Digi-Reel®, Tube, or Tape & Reel).

Extended Temperature Range Consideration: PC457L0NIP0F and PC457L0YIP0F extend the lower operating temperature to -55°C, providing enhanced cold-temperature performance compared to the ACPL-M43T baseline of -40°C.

Product Status Consideration: PS8101-AX carries a "Not For New Designs" status and should be selected only when existing inventory constraints or legacy system requirements mandate its use. All other substitute parts maintain Active product status.

Switching Speed Trade-off: PC457L0NIP0F and PC457L0YIP0F offer faster turn-on time (200ns vs. 150ns baseline) and comparable turn-off time (400ns vs. 500ns baseline), providing improved switching performance in time-critical applications.

Frequently Asked Questions (FAQ)

Q: Can ACPL-M43T-000E be used as a direct replacement for ACPL-M43T? A: Yes. ACPL-M43T-000E is electrically identical to ACPL-M43T. The only differences are packaging format (Tube) and RoHS compliance status (ROHS3 Compliant vs. non-compliant). Both maintain identical isolation voltage, current transfer ratio, switching times, and automotive qualification.

Q: What is the primary difference between ACPL-M43T and the onsemi FODM452 series? A: The ACPL-M43T operates at 4000Vrms isolation voltage, while FODM452 series parts operate at 3750Vrms. Both maintain identical output voltage (20V max), output current (8mA), and package configuration. The 250Vrms reduction in isolation specification does not affect functional compatibility in applications designed for 4000Vrms operation.

Q: Are the onsemi FODM452 and FODM453 variants interchangeable? A: Yes. FODM452 and FODM453 are electrically identical. Selection between them is determined solely by packaging format: FODM452 is available in Bulk and Cut Tape & Digi-Reel® formats, while FODM453 is available in Tube and Tape & Reel formats. The "R2" and "R2V" suffixes indicate packaging variants (Tape & Reel vs. Cut Tape & Digi-Reel®) and do not affect electrical performance.

Q: Can I use PC457L0NIP0F in place of ACPL-M43T in an automotive application? A: PC457L0NIP0F is functionally compatible from an electrical standpoint (3750Vrms isolation, 20V output, 8mA output current). However, PC457L0NIP0F is not automotive-grade and does not carry AEC-Q100 qualification. Use is restricted to non-automotive applications or applications where automotive qualification is not a design requirement.

Q: What is the significance of the "Not For New Designs" status on PS8101-AX? A: This designation indicates that Renesas Electronics Corporation is not recommending this part for new circuit designs. While PS8101-AX remains functionally compatible with ACPL-M43T, it should be selected only when existing inventory is available or legacy system support is required. For new designs, select from parts with Active product status.

Q: How do switching times affect substitution decisions? A: The ACPL-M43T specifies turn-on/turn-off times of 150ns/500ns. Substitute parts with longer switching times (up to 500ns/600ns) are compatible in applications where the circuit design tolerates extended propagation delays. PC457L0 series parts offer faster turn-on (200ns), which may provide performance benefits in time-critical applications but does not prevent substitution of slower parts in less demanding circuits.

Q: What packaging formats are available for the FODM452 series? A: FODM452 is available in Bulk and Cut Tape & Digi-Reel® formats. FODM453 is available in Tube and Tape & Reel formats. FODM452R2, FODM452R2V, FODM453R2, and FODM453R2V are packaging variants of the base FODM452 and FODM453 parts. Selection is based on manufacturing process requirements and inventory management practices.

Q: Can I substitute a part with a lower current transfer ratio (CTR)? A: Current transfer ratio determines the output current for a given input current. ACPL-M43T specifies 32% to 100% CTR at 10mA input. Substitute parts with lower CTR specifications (such as FODM452 at 20% to 50% CTR at 16mA input) are compatible only if the circuit design accommodates the reduced output current. Verify that the application does not require the higher CTR performance of the primary part.

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