PS2532L-2 Equivalent & Substitute Parts

Part Overview

The PS2532L-2 is a 5000Vrms isolation 2-channel Darlington output optoisolator in 8-SMD surface mount packaging, manufactured by CEL. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines for continued system support and new designs. The substitute parts listed below maintain electrical and mechanical compatibility within the defined parameter ranges.

Key Parameters

Parameter	PS2532L-2
Number of Channels	2
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	1500% @ 1mA
Current Transfer Ratio (Max)	6500% @ 1mA
Rise / Fall Time (Typ)	100µs, 100µs
Output Type	Darlington
Voltage - Output (Max)	300V
Current - Output / Channel	150mA
Vce Saturation (Max)	1V
Operating Temperature	-55°C ~ 100°C
Package / Case	8-SMD, Gull Wing
Input Type	DC
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the PS2532L-2 is determined by the following critical parameters:

Isolation Voltage (5000Vrms): All substitutes must meet or exceed this specification to maintain the same galvanic isolation level.
Number of Channels (2): Pin-to-pin compatibility requires identical channel count.
Output Type (Darlington): Electrical characteristics of the output stage must match.
Package Configuration (8-SMD, Gull Wing): Physical compatibility with existing PCB layouts and pick-and-place equipment.
Input Type (DC): Signal interface characteristics must remain consistent.

The three substitute parts—LTV-825S, LTV-825S-TA, and LTV-825S-TA1—all satisfy these core requirements. The primary differences involve current transfer ratio ranges, maximum output voltage ratings, output current per channel, and temperature operating ranges, which must be evaluated against application-specific circuit requirements.

Parameter Comparison

Parameter	PS2532L-2 (CEL)	LTV-825S (Lite-On)	LTV-825S-TA (Lite-On)	LTV-825S-TA1 (Lite-On)
Number of Channels	2	2	2	2
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	1500% @ 1mA	600% @ 1mA	600% @ 1mA	600% @ 1mA
Current Transfer Ratio (Max)	6500% @ 1mA	7500% @ 1mA	7500% @ 1mA	7500% @ 1mA
Rise / Fall Time (Typ)	100µs, 100µs	60µs, 53µs	60µs, 53µs	60µs, 53µs
Output Type	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	300V	35V	35V	35V
Current - Output / Channel	150mA	80mA	80mA	80mA
Vce Saturation (Max)	1V	1V	1V	1V
Operating Temperature	-55°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing
Input Type	DC	DC	DC	DC
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three LTV-825 variants (LTV-825S, LTV-825S-TA, LTV-825S-TA1) from Lite-On Inc. are active products with ROHS3 compliance, providing long-term supply assurance and regulatory compliance advantages over the obsolete PS2532L-2.

Critical Design Considerations:

Maximum Output Voltage: The PS2532L-2 supports 300V maximum output voltage, while all LTV-825 variants are rated for 35V maximum. Applications requiring output voltages exceeding 35V cannot use these substitutes.
Output Current: The PS2532L-2 provides 150mA per channel versus 80mA for LTV-825 variants. Circuits drawing more than 80mA per channel require design modification.
Current Transfer Ratio: The PS2532L-2 minimum CTR of 1500% exceeds all LTV-825 variants at 600% minimum. Lower CTR values may require higher input LED current to achieve equivalent output performance.
Operating Temperature: The PS2532L-2 extends to -55°C minimum, while LTV-825 variants operate from -30°C. Cold temperature applications below -30°C require component selection confirmation.
Response Time: LTV-825 variants exhibit faster rise and fall times (60µs, 53µs) compared to the PS2532L-2 (100µs, 100µs), resulting in improved switching speed characteristics.

Selection among LTV-825S, LTV-825S-TA, and LTV-825S-TA1 is determined by packaging and supply requirements rather than electrical performance, as these variants are electrically identical.

Frequently Asked Questions (FAQ)

Q: Can LTV-825S variants directly replace PS2532L-2 in existing designs?

A: Substitution is possible only if the application operates within LTV-825 parameter limits: maximum output voltage of 35V, output current not exceeding 80mA per channel, and minimum operating temperature of -30°C or higher. Design review is required to confirm these constraints are satisfied.

Q: Why do LTV-825 variants have lower maximum output current than PS2532L-2?

A: The PS2532L-2 and LTV-825 series are designed for different application classes. Circuits requiring 150mA output current demand component selection from alternative product families with higher current ratings.

Q: What is the difference between LTV-825S, LTV-825S-TA, and LTV-825S-TA1?

A: LTV-825S-TA and LTV-825S-TA1 are supplied in Tape & Reel format for automated assembly, while LTV-825S is supplied in standard packaging. Electrical performance and pinout are identical; selection depends on packaging and volume requirements.

Q: Are LTV-825 variants suitable for applications designed for -55°C operation?

A: No. LTV-825 variants specify -30°C as the minimum operating temperature. Applications requiring operation below -30°C must utilize alternative components with extended temperature ranges.

Q: Does substitution affect circuit isolation certification?

A: Both PS2532L-2 and LTV-825 variants maintain 5000Vrms isolation rating. Isolation certification remains valid with electrically equivalent substitution; however, regulatory documentation and equipment qualification may require update.

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