SFH6156-1T Equivalent & Substitute Parts

Part Overview

The SFH6156-1T is an optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This single-channel device provides 5300Vrms isolation with a 4-SMD surface mount package. The part is active and in production with 6443 units currently in stock. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring optoisolation in DC input circuits.

Key Parameters

Parameter	Value
Manufacturer Part Number	SFH6156-1T
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	40% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution for the SFH6156-1T is determined by the following critical parameters:

Isolation Voltage: 5300Vrms (primary isolation requirement)
Number of Channels: 1 (single-channel configuration)
Output Type: Transistor (output stage architecture)
Package / Case: 4-SMD, Gull Wing (physical and electrical footprint compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Current Transfer Ratio Range: 40% to 80% @ 10mA (optical coupling efficiency)
Maximum Output Voltage: 70V (load voltage capability)
Maximum Output Current: 50mA per channel (load current capability)
Vce Saturation: 400mV (transistor saturation characteristic)

Substitute parts are grouped into two categories:

MFR Recommended Substitutes (Vishay SFH6156 and SFH6106 series): Parts that maintain identical isolation voltage, package, and core electrical specifications with variations in Current Transfer Ratio or packaging format (Cut Tape vs. Tape & Reel).

Parametric Equivalents (Isocom SFH615A and SFH617A series): Parts that meet the same isolation voltage, output type, package, and load specifications but originate from an alternative manufacturer. The SFH617A-3XSMT&R operates at a different isolation voltage specification (7.5Vpk) and is included as a parametric equivalent for applications where lower isolation voltage is acceptable.

Parameter Comparison

Parameter	SFH6156-1T	SFH6156-2T	SFH6106-1T	SFH6106-1X001T	SFH6156-1X001T	SFH615A-2XSMT&R	SFH615A-3XSMT&R	SFH615A-4XSMT&R	SFH617A-3XSMT&R
Manufacturer	Vishay	Vishay	Vishay	Vishay	Vishay	Isocom	Isocom	Isocom	Isocom
Number of Channels	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	7.5Vpk
Current Transfer Ratio (Min)	40%	63%	40%	40%	40%	63%	100%	160%	100%
Current Transfer Ratio (Max)	80%	125%	80%	80%	80%	125%	200%	320%	200%
Turn On Time (Typ)	3µs	3µs	3µs	3µs	3µs	4.2µs	4.2µs	6µs	-
Turn Off Time (Typ)	2.3µs	2.3µs	2.3µs	2.3µs	2.3µs	23µs	23µs	25µs	-
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	70V	70V	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	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	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Packaging Format	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	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)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active
Inventory (Pcs)	6443	35400	17775	21200	1651	7636	1943	6424	2029

Engineering Selection Recommendations

Vishay SFH6156-2T: Direct manufacturer recommendation for applications requiring higher Current Transfer Ratio (63% to 125% @ 10mA). Maintains identical isolation voltage, package, and thermal range. Suitable for designs where improved optical coupling efficiency reduces input current requirements. Available in higher inventory (35400 units).

Vishay SFH6106-1T and SFH6106-1X001T: Parametric equivalents with identical electrical specifications to SFH6156-1T. Differentiated by packaging format (Cut Tape vs. Tape & Reel). SFH6106-1X001T provides Tape & Reel packaging for high-volume assembly processes. Both maintain 40% to 80% Current Transfer Ratio range and full temperature range (-55°C ~ 100°C).

Vishay SFH6156-1X001T: Tape & Reel variant of the primary part number. Identical electrical specifications with alternative packaging format for automated assembly. Lower inventory (1651 units) compared to Cut Tape variant.

Isocom SFH615A Series (2XSMT&R, 3XSMT&R, 4XSMT&R): Alternative manufacturer optoisolators with 5300Vrms isolation. Differentiated by Current Transfer Ratio grades (63%-125%, 100%-200%, 160%-320% respectively). Operating temperature range limited to -30°C ~ 100°C. Turn-off time specifications are longer (23µs to 25µs) compared to Vishay parts (2.3µs). Suitable for applications where extended temperature range is not required and slower switching times are acceptable.

Isocom SFH617A-3XSMT&R: Operates at 7.5Vpk isolation voltage, significantly lower than the 5300Vrms specification of the primary part. Included as parametric equivalent only for applications where lower isolation voltage meets design requirements. Current Transfer Ratio range 100%-200% @ 10mA. Operating temperature -30°C ~ 100°C.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and active product status. Selection should be based on Current Transfer Ratio requirements, operating temperature range, switching speed specifications, and packaging format compatibility with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SFH6156-2T be used as a direct replacement for SFH6156-1T?

A: Yes. SFH6156-2T is a manufacturer-recommended substitute with identical isolation voltage (5300Vrms), package (4-SMD, Gull Wing), output type (Transistor), and load specifications (70V max, 50mA per channel). The primary difference is higher Current Transfer Ratio (63%-125% vs. 40%-80%), which reduces input LED current requirements. Electrical and mechanical compatibility is maintained.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel® packaging is suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Both formats contain identical components; packaging format selection depends on assembly process requirements. SFH6156-1T is available in Cut Tape format, while SFH6156-1X001T provides Tape & Reel format.

Q: Are Isocom SFH615A parts compatible with Vishay SFH6156 designs?

A: Isocom SFH615A series parts are compatible from an electrical and mechanical standpoint. All maintain 5300Vrms isolation, 4-SMD Gull Wing package, 70V maximum output voltage, and 50mA output current. Key differences include longer switching times (23µs to 25µs turn-off vs. 2.3µs for Vishay) and narrower operating temperature range (-30°C ~ 100°C vs. -55°C ~ 100°C). Design validation is required for applications sensitive to switching speed or requiring extended low-temperature operation.

Q: Why is SFH617A-3XSMT&R listed as a substitute if it has different isolation voltage?

A: SFH617A-3XSMT&R is included as a parametric equivalent for applications where the lower isolation voltage specification (7.5Vpk) is acceptable. It maintains identical package, output type, load specifications, and Current Transfer Ratio range (100%-200%). This part is suitable only for designs where 7.5Vpk isolation meets the isolation requirement; it is not a direct replacement for applications requiring 5300Vrms isolation.

Q: What is Current Transfer Ratio and how does it affect part selection?

A: Current Transfer Ratio (CTR) is the ratio of output collector current to input LED forward current, expressed as a percentage at a specified input current (typically 10mA). SFH6156-1T has 40%-80% CTR, meaning output current is 40% to 80% of input current. Higher CTR parts (SFH6156-2T at 63%-125%, SFH615A-4XSMT&R at 160%-320%) require less input current for the same output current, reducing input circuit power consumption. Selection depends on input circuit current availability and output load requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. All parts are active products in current production.

Q: What is the temperature range difference between Vishay and Isocom parts?

A: Vishay SFH6156 and SFH6106 series operate across -55°C ~ 100°C. Isocom SFH615A and SFH617A series operate across -30°C ~ 100°C. Applications requiring operation below -30°C must use Vishay parts. For applications within -30°C ~ 100°C range, both manufacturers' parts are suitable.

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