ACPL-K49U-000E Equivalent & Substitute Parts

Part Overview

The ACPL-K49U-000E is a 5000Vrms optoisolator with transistor output manufactured by Broadcom Limited under the R²Coupler™ series. This single-channel device operates in the -40°C to 125°C temperature range and is housed in an 8-SOIC surface mount package. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across isolation voltage, channel configuration, output type, package format, and operating temperature specifications.

Key Parameters

Parameter	Value
Manufacturer	Broadcom Limited
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Output Type	Transistor
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Operating Temperature	-40°C ~ 125°C
Package / Case	8-SOIC (0.268", 6.81mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ACPL-K49U-000E are qualified based on the following criteria:

Isolation Voltage: 5000Vrms (exact match required)
Number of Channels: 1 (exact match required)
Output Type: Transistor (exact match required)
Package Format: 8-SOIC with 6.81mm width (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Temperature Range: -40°C ~ 125°C (exact match required)
Current Transfer Ratio: 32% to 100% @ 10mA (range match required)
Output Voltage: 20V maximum (exact match required)
Output Current: 8mA per channel (exact match required)

The identified substitutes maintain these core electrical and mechanical parameters while differing in timing characteristics and optional automotive qualification.

Parameter Comparison

Parameter	ACPL-K49U-000E	ACPL-K43T-000E	ACPL-K49T-000E
Manufacturer	Broadcom Limited	Broadcom Limited	Broadcom Limited
Number of Channels	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	32% @ 10mA	32% @ 10mA	32% @ 10mA
Current Transfer Ratio (Max)	100% @ 10mA	100% @ 10mA	100% @ 10mA
Turn On / Turn Off Time (Typ)	20µs, 20µs (Max)	150ns, 500ns	20µs, 20µs (Max)
Input Type	DC	DC	DC
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.5V	1.55V	1.5V
Current - DC Forward (If) (Max)	20mA	20mA	20mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.268", 6.81mm Width)	8-SOIC (0.268", 6.81mm Width)	8-SOIC (0.268", 6.81mm Width)
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts maintain Active product status and RoHS3 compliance. Selection between ACPL-K49U-000E, ACPL-K43T-000E, and ACPL-K49T-000E is determined by application-specific timing requirements and qualification needs.

ACPL-K49U-000E and ACPL-K49T-000E share identical turn-on and turn-off timing specifications (20µs typical, 20µs maximum) and forward voltage characteristics (1.5V typical). These parts are functionally equivalent for applications requiring standard switching speed performance.

ACPL-K43T-000E provides faster switching performance with turn-on and turn-off times of 150ns and 500ns respectively. This part carries AEC-Q100 automotive qualification and is designated for Grade Automotive applications. Forward voltage is 1.55V typical, representing a 0.05V variance from the other two parts.

Selection should prioritize timing requirements first, then qualification status. Automotive applications requiring AEC-Q100 qualification must use ACPL-K43T-000E. Standard industrial applications with standard switching speed requirements may use either ACPL-K49U-000E or ACPL-K49T-000E.

Frequently Asked Questions (FAQ)

Q: Can ACPL-K43T-000E replace ACPL-K49U-000E in any application?

A: ACPL-K43T-000E is electrically compatible as a substitute based on isolation voltage, channel count, output type, and package format. However, the faster switching time (150ns/500ns versus 20µs/20µs) may affect circuit behavior. Applications designed for standard switching speed must evaluate timing impact before substitution.

Q: What is the primary difference between ACPL-K49U-000E and ACPL-K49T-000E?

A: Both parts share identical electrical specifications including turn-on/turn-off timing (20µs/20µs) and forward voltage (1.5V). The primary distinction is packaging designation: ACPL-K49U-000E uses standard tube packaging while ACPL-K49T-000E also uses tube packaging. Both are functionally equivalent for circuit design purposes.

Q: Is ACPL-K43T-000E suitable for non-automotive applications?

A: Yes. ACPL-K43T-000E meets all electrical and mechanical requirements for standard industrial applications. The AEC-Q100 automotive qualification is an additional certification that does not restrict use in non-automotive designs. The faster switching characteristics (150ns/500ns) should be evaluated against application timing requirements.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 8-SOIC package with 6.81mm width and surface mount configuration, ensuring mechanical and electrical pin compatibility.

Q: What is the significance of the 0.05V difference in forward voltage between ACPL-K43T-000E and the other two parts?

A: The forward voltage difference (1.55V versus 1.5V) is within typical component tolerance and does not affect substitution eligibility. Circuit designs should accommodate standard component tolerances for forward voltage across all three parts.

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