PS2705-1-M-A Optoisolator Equivalent and Substitute Parts

Part Overview

The PS2705-1-M-A is a 3750Vrms optoisolator with transistor output, single-channel configuration in 4-SOP surface mount packaging, manufactured by CEL. This component has been discontinued at DiGi Electronics, necessitating the identification of equivalent substitute parts that meet the same electrical and mechanical specifications for system-level compatibility and continued design support.

Key Parameters

Parameter	PS2705-1-M-A
Manufacturer	CEL
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	3750Vrms
Output Type	Transistor
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 5mA
Rise / Fall Time (Typ)	3µs, 5µs
Input Type	AC, DC
Voltage - Output (Max)	40V
Current - Output / Channel	80mA
Voltage - Forward (Vf) (Typ)	1.1V
Current - DC Forward (If) (Max)	50 mA
Vce Saturation (Max)	300mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Supplier Device Package	4-SOP
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the PS2705-1-M-A is determined by equivalence in the following critical electrical and mechanical parameters:

Critical Equivalence Criteria:

Voltage - Isolation: 3750Vrms
Output Type: Transistor
Number of Channels: 1
Input Type: AC, DC
Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing (with allowance for 4-Mini-Flat variant)

Performance Parameters (allowable variation):

Current Transfer Ratio: minimum 20% and maximum capability of at least 150% @ specified current
Voltage - Output (Max): minimum 35V
Current - Output / Channel: minimum 50mA
Vce Saturation (Max): maximum 300mV
Operating Temperature: must encompass or exceed -40°C ~ 110°C range

The substitute parts identified—FODM2705, FODM2705R2, FODM2705R2V (onsemi), HCPL-354-000E (Broadcom), and LTV-354T (Lite-On)—all satisfy these core criteria and maintain functional equivalence in high-voltage isolation applications.

Parameter Comparison

Parameter	PS2705-1-M-A (CEL)	FODM2705 (onsemi)	FODM2705R2 (onsemi)	FODM2705R2V (onsemi)	HCPL-354-000E (Broadcom)	LTV-354T (Lite-On)
Number of Channels	1	1	1	1	1	1
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	20% @ 1mA	20% @ 1mA
Current Transfer Ratio (Max)	150% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	400% @ 1mA	400% @ 1mA
Rise / Fall Time (Typ)	3µs, 5µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	40V	40V	40V	40V	35V	35V
Current - Output / Channel	80mA	80mA	80mA	80mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.1V	1.4V (Max)	1.4V (Max)	1.4V (Max)	1.2V	1.2V
Current - DC Forward (If) (Max)	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA
Vce Saturation (Max)	300mV	300mV	300mV	300mV	200mV	200mV
Operating Temperature	-55°C ~ 100°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-55°C ~ 100°C	-30°C ~ 110°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active

Engineering Selection Recommendations

onsemi FODM2705 Series (FODM2705, FODM2705R2, FODM2705R2V): These parts provide direct electrical equivalence with identical isolation voltage, current ratings, and output specifications. All are ROHS3 compliant and currently active in production. Selection between FODM2705 (Tube packaging), FODM2705R2 (Tape & Reel), and FODM2705R2V (Tape & Reel) depends on procurement and assembly requirements. Operating temperature range (-40°C ~ 110°C) extends the upper limit compared to the PS2705-1-M-A.

Broadcom HCPL-354-000E: This part meets all critical isolation and functional requirements with improved output saturation performance (200mV vs. 300mV). Operating temperature matches the PS2705-1-M-A (-55°C ~ 100°C). Reduced maximum output current (50mA vs. 80mA) and output voltage (35V vs. 40V) are the primary design constraints. Package variant is 4-Mini-Flat rather than 4-SOP, requiring PCB layout evaluation.

Lite-On LTV-354T: This part provides functional equivalence with identical isolation voltage and transistor output. Superior saturation performance (200mV) and broader operating temperature range (-30°C ~ 110°C) are available. Output ratings (50mA, 35V maximum) require circuit compatibility verification. 4-SOP package matches the original PS2705-1-M-A.

Frequently Asked Questions (FAQ)

Q: Can FODM2705 replace PS2705-1-M-A in my application? A: FODM2705 provides electrical equivalence across all critical parameters: 3750Vrms isolation, 1-channel transistor output, 80mA output current, and 40V maximum output voltage. Both support AC and DC inputs with identical MSL ratings. Packaging and product availability favor FODM2705 selection.

Q: What is the difference between FODM2705, FODM2705R2, and FODM2705R2V? A: All three variants are electrically identical. The difference is packaging: FODM2705 comes in Tube, FODM2705R2 in Tape & Reel (TR), and FODM2705R2V in Tape & Reel (TR). Selection depends on assembly and procurement volume requirements.

Q: Can I use HCPL-354-000E as a direct replacement? A: HCPL-354-000E is functionally compatible but with design considerations: maximum output current is 50mA (vs. 80mA), output voltage is limited to 35V (vs. 40V), and the package is 4-Mini-Flat instead of 4-SOP. Circuit validation is required for applications utilizing the full current or voltage specifications of the PS2705-1-M-A.

Q: How do operating temperature ranges compare? A: PS2705-1-M-A and HCPL-354-000E both specify -55°C ~ 100°C. FODM2705 variants extend to -40°C ~ 110°C (upper limit advantage). LTV-354T covers -30°C ~ 110°C. Select based on system thermal requirements.

Q: Are all substitutes RoHS3 compliant? A: All identified substitutes (FODM2705, FODM2705R2, FODM2705R2V, HCPL-354-000E, and LTV-354T) are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the PS2705-1-M-A.

Q: What is the difference in Current Transfer Ratio specifications? A: PS2705-1-M-A specifies 50%-150% @ 5mA. FODM2705 variants provide 50%-300% @ 5mA (enhanced maximum). HCPL-354-000E and LTV-354T specify 20%-400% @ 1mA (broader operating range at lower input current). This affects bias circuit design and transient response characteristics.

Q: Are there any REACH compliance differences? A: PS2705-1-M-A is listed as REACH Affected. All substitute parts (FODM2705, FODM2705R2, FODM2705R2V, HCPL-354-000E, LTV-354T) are REACH Unaffected. Confirm compliance status with procurement requirements.

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