HCPL2531WV Equivalent & Substitute Parts

Part Overview

The HCPL2531WV is a 2-channel optoisolator with transistor output manufactured by onsemi, rated for 2500Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part operates across a temperature range of -55°C to 100°C and is housed in an 8-DIP through-hole package. Substitute parts must maintain functional compatibility across isolation voltage, channel configuration, output characteristics, and package form factor.

Key Parameters

Parameter	HCPL2531WV
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	2
Voltage - Isolation	2500Vrms
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Turn On / Turn Off Time (Typ)	450ns / 300ns
Output Type	Transistor
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.45V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.400", 10.16mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the HCPL2531WV is determined by the following critical parameters:

Number of Channels: Must be 2 channels
Output Type: Must be transistor output
Mounting Type: Must be through-hole
Current - Output / Channel: Must support 8mA minimum
Voltage - Isolation: Must meet or exceed 2500Vrms
Operating Temperature Range: Must cover -55°C to 100°C minimum
Package Compatibility: 8-DIP form factor required

Substitute parts are grouped into two categories:

MFR Recommended: HCPL2531TVM offers enhanced isolation voltage (5000Vrms) with improved switching performance and active product status.

Similar Parts: HCPL-2533, HCPL-2533-000E, HCPL-253L-000E, and HCPL-4534-000E provide 3750Vrms isolation with varying current transfer ratios and switching characteristics, all in active production status.

Parameter Comparison

Parameter	HCPL2531WV	HCPL2531TVM	HCPL-2533	HCPL-2533-000E	HCPL-253L-000E	HCPL-4534-000E
Manufacturer	onsemi	Fairchild Semiconductor	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active	Active	Active
Number of Channels	2	2	2	2	2	2
Voltage - Isolation	2500Vrms	5000Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	15% @ 8mA	15% @ 8mA	19% @ 16mA	15% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA	50% @ 16mA	—	—	50% @ 16mA	50% @ 16mA
Turn On / Turn Off Time (Typ)	450ns / 300ns	250ns / 260ns	800ns / 1µs	800ns / 1µs	200ns / 600ns	200ns / 600ns
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	20V	20V	7V	7V	7V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.45V	1.45V	1.5V	1.5V	1.5V	1.5V
Current - DC Forward (If) (Max)	25mA	25mA	25mA	25mA	25mA	25mA
Operating Temperature	-55°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	8-DIP (0.400", 10.16mm)	8-DIP (0.400", 10.16mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant	—	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

HCPL2531TVM is the primary recommended substitute. It maintains the same 8-DIP (0.400", 10.16mm) package footprint as the HCPL2531WV, ensuring direct PCB compatibility without layout modifications. The HCPL2531TVM provides superior isolation voltage (5000Vrms versus 2500Vrms) and faster switching performance (250ns/260ns versus 450ns/300ns). This part is in active production status and supports the full -40°C to 100°C operating range, which covers the HCPL2531WV specification except at the lower temperature extreme (-55°C). Active product status ensures long-term availability and supply chain stability.

HCPL-253L-000E and HCPL-4534-000E are secondary alternatives for applications where the lower package profile (0.300" versus 0.400") is acceptable. Both parts are ROHS3 compliant and in active production. HCPL-253L-000E matches the current transfer ratio specification (19% min / 50% max @ 16mA) of the original part. HCPL-4534-000E supports the full 20V maximum output voltage, matching the HCPL2531WV specification, while HCPL-253L-000E is limited to 7V output.

HCPL-2533 and HCPL-2533-000E provide equivalent functionality but with reduced current transfer ratio (15% min @ 8mA) and slower switching times (800ns/1µs). HCPL-2533-000E is ROHS3 compliant; HCPL-2533 is not. Both are suitable for applications where switching speed is not critical.

Applications requiring operation at -55°C must retain the HCPL2531WV or select alternatives with confirmed -55°C minimum temperature rating. The HCPL2531TVM minimum operating temperature is -40°C.

Frequently Asked Questions (FAQ)

Q: Can HCPL2531TVM replace HCPL2531WV directly on the PCB?

A: Yes. Both parts use the 8-DIP (0.400", 10.16mm) package with identical pin spacing and through-hole mounting. No PCB layout changes are required. Pin-for-pin compatibility is maintained.

Q: What is the key difference between HCPL2531TVM and the Broadcom alternatives?

A: HCPL2531TVM maintains the original package size (0.400" DIP) and maximum output voltage (20V). Broadcom alternatives (HCPL-2533, HCPL-253L-000E, HCPL-4534-000E) use a smaller 0.300" DIP package and most are limited to 7V maximum output, except HCPL-4534-000E which supports 20V. Switching performance varies across all alternatives.

Q: Why do some substitute parts have different current transfer ratios?

A: Current transfer ratio is a fundamental device characteristic determined by the internal LED-to-photodetector coupling efficiency. Different part numbers reflect different design generations or manufacturers. The HCPL2531WV specifies 19-50% @ 16mA; alternatives may specify different test conditions (e.g., 15% @ 8mA) or narrower ranges.

Q: Is the HCPL2531TVM suitable for -55°C operation?

A: No. HCPL2531TVM is rated for -40°C to 100°C. Applications requiring -55°C minimum temperature must use the HCPL2531WV or confirm alternative part specifications include -55°C operation.

Q: What is the impact of switching time differences?

A: Turn-on and turn-off times affect signal propagation delay and maximum switching frequency. HCPL2531TVM (250ns/260ns) is faster than HCPL2531WV (450ns/300ns). Broadcom parts vary: HCPL-253L-000E and HCPL-4534-000E (200ns/600ns) are faster on turn-on but slower on turn-off. Select based on circuit timing requirements.

Q: Can I use HCPL-2533 series parts in a 0.400" DIP footprint?

A: No. HCPL-2533 series parts are 0.300" DIP packages and will not fit 0.400" DIP sockets or PCB pads without mechanical adaptation. HCPL2531TVM is the only substitute maintaining the original 0.400" package size.

Q: Are all substitute parts RoHS compliant?

A: HCPL2531TVM compliance status is not specified in available data. HCPL-2533 is RoHS non-compliant. HCPL-2533-000E, HCPL-253L-000E, and HCPL-4534-000E are ROHS3 compliant. Verify RoHS requirements for your application before selection.

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