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6N137SD Equivalent & Substitute Parts
Part Overview
The 6N137SD is a logic output optoisolator manufactured by onsemi, featuring 2500Vrms isolation voltage, 10Mbps data rate, and open collector output in an 8-SMD package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The 6N137SD serves applications requiring galvanic isolation in digital signal transmission with moderate isolation voltage requirements.
Substiute Parts
Key Parameters
| Parameter | 6N137SD Value |
|---|---|
| Isolation Voltage | 2500Vrms |
| Number of Channels | 1 |
| Output Type | Open Collector |
| Data Rate | 10Mbps |
| Output Current | 50 mA |
| Common Mode Transient Immunity | 10kV/µs (Typ) |
| Propagation Delay (tpLH / tpHL) | 75ns / 75ns |
| Supply Voltage | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package | 8-SMD, Gull Wing |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the 6N137SD is determined by the following critical parameters:
Primary Substitution Criteria:
- Output type: Open Collector configuration
- Isolation voltage: Minimum 2500Vrms (higher values acceptable)
- Data rate: Minimum 10Mbps
- Output current: Minimum 50 mA per channel
- Common mode transient immunity: Minimum 10kV/µs
- Package: 8-SMD, Gull Wing form factor
- Supply voltage compatibility: 4.5V ~ 5.5V range
Substitute Categories:
Direct Replacement (Recommended): 6N137SDM from onsemi provides identical electrical performance with doubled isolation voltage (5000Vrms), active product status, and improved temperature range (-40°C ~ 100°C). This part maintains all critical electrical parameters while offering enhanced reliability margins.
Functional Equivalents: HCPL-260L series (Broadcom Limited) and 6N137SMT&R (Isocom Components) provide open collector optoisolators with compatible isolation voltages (3750Vrms to 5000Vrms), matching data rates, and identical output current specifications. These parts support the same supply voltage range and package configuration.
Alternative Technology: FOD3180SDV represents a different output topology (gate driver with 2.5A peak output) suitable only for applications where higher output current and gate drive capability are required, not for direct pin-compatible replacement.
Line Receiver Variants: HCPL-2602 series (Broadcom Limited) provides line receiver functionality with lower isolation voltage (3750Vrms) and reduced common mode transient immunity (1kV/µs), suitable only for applications with relaxed isolation and noise immunity requirements.
Parameter Comparison
| Parameter | 6N137SD | 6N137SDM | 6N137SMT&R | HCPL-260L-500E | HCPL-260L-520E | HCPL-260L-560E |
|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Isocom Components | Broadcom Limited | Broadcom Limited | Broadcom Limited |
| Isolation Voltage | 2500Vrms | 5000Vrms | 5000Vrms | 3750Vrms | 5000Vrms | 3750Vrms |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Type | Open Collector | Open Collector | Open Collector | Open Collector, Schottky Clamped | Open Collector, Schottky Clamped | Open Collector, Schottky Clamped |
| Data Rate | 10Mbps | 10Mbps | 10Mbps | 15MBd | 15MBd | 15MBd |
| Output Current / Channel | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA |
| Common Mode Transient Immunity | 10kV/µs | 10kV/µs | 5kV/µs | 10kV/µs | 10kV/µs | 10kV/µs |
| Propagation Delay (tpLH / tpHL) | 75ns / 75ns | 75ns / 75ns | 75ns / 75ns | 75ns / 75ns | 75ns / 75ns | 75ns / 75ns |
| Supply Voltage | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 7V | 2.7V ~ 3.6V, 4.5V ~ 5.5V | 2.7V ~ 3.6V, 4.5V ~ 5.5V | 2.7V ~ 3.6V, 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 100°C | -55°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 8-SMD, Gull Wing | 8-SMD, Gull Wing | 8-SMD, Gull Wing | 8-SMD, Gull Wing | 8-SMD, Gull Wing | 8-SMD, Gull Wing |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Recommendation: 6N137SDM
The 6N137SDM is the manufacturer-recommended upgrade from onsemi. It maintains identical electrical performance to the 6N137SD across all critical parameters while providing doubled isolation voltage (5000Vrms), extended operating temperature range (-40°C ~ 100°C), and active product status. This part is ROHS3 compliant and carries the same MSL rating. Selection of 6N137SDM eliminates obsolescence risk and provides superior reliability margins for new designs.
Secondary Recommendation: HCPL-260L Series (Broadcom Limited)
The HCPL-260L-500E, HCPL-260L-520E, and HCPL-260L-560E provide functional equivalence with the following considerations:
- HCPL-260L-500E and HCPL-260L-560E: 3750Vrms isolation voltage (meets minimum 2500Vrms requirement)
- HCPL-260L-520E: 5000Vrms isolation voltage (exceeds requirement)
- All variants: 15MBd data rate (exceeds 10Mbps requirement), 10kV/µs CMTI, 50 mA output current
- Schottky clamped output provides faster switching characteristics (24ns rise time vs. 50ns)
- Dual supply voltage support (2.7V ~ 3.6V and 4.5V ~ 5.5V) offers design flexibility
- ROHS3 compliant, active product status
Alternative: 6N137SMT&R (Isocom Components)
The 6N137SMT&R provides pin-compatible substitution with 5000Vrms isolation and identical 10Mbps data rate. Note the reduced common mode transient immunity (5kV/µs vs. 10kV/µs) and fixed 7V supply voltage requirement. This part is suitable only for applications where the lower CMTI specification is acceptable and 7V supply is available.
Not Recommended for Direct Replacement:
FOD3180SDV and HCPL-2602 series are not suitable direct replacements due to different output topologies and reduced isolation voltage specifications.
Frequently Asked Questions (FAQ)
Q: Can I use 6N137SDM as a direct replacement for 6N137SD?
A: Yes. The 6N137SDM is the manufacturer-recommended successor. It maintains identical pin configuration, package, and all critical electrical parameters. The doubled isolation voltage and extended temperature range represent improvements over the obsolete 6N137SD.
Q: What is the key difference between 6N137SDM and HCPL-260L series?
A: Both are functionally equivalent optoisolators with open collector outputs. The primary differences are: HCPL-260L offers higher data rate (15MBd vs. 10Mbps), Schottky clamped output for faster switching, and dual supply voltage support. The 6N137SDM maintains closer electrical compatibility with the original 6N137SD design.
Q: Does the HCPL-260L-520E require circuit modifications?
A: The HCPL-260L-520E is pin-compatible and requires no circuit modifications. However, the Schottky clamped output may produce different switching characteristics. Verify that output rise/fall times (24ns/10ns) are compatible with your application timing requirements.
Q: Why does 6N137SMT&R have a 7V supply requirement?
A: The 6N137SMT&R from Isocom Components is specified for 7V supply operation. Applications designed for 4.5V ~ 5.5V operation require voltage regulation or redesign to accommodate this part.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All active substitute parts listed (6N137SDM, HCPL-260L series, 6N137SMT&R) are ROHS3 compliant. The original 6N137SD compliance status is not specified.
Q: What is the significance of Schottky clamped output in HCPL-260L?
A: Schottky clamping reduces output voltage swing and improves switching speed. This results in faster rise/fall times (24ns/10ns vs. 50ns/12ns on 6N137SD) and lower output impedance, beneficial for high-speed digital applications.
Q: Can I substitute based on isolation voltage alone?
A: No. Isolation voltage is one of several critical parameters. Substitution requires matching output type (open collector), data rate, output current, common mode transient immunity, and supply voltage specifications. Verify all parameters before selection.
Q: What is the inventory status of these parts?
A: 6N137SDM has the highest inventory (100,400 pcs). HCPL-260L variants range from 783 to 2,700 pcs. 6N137SMT&R has 5,300 pcs available. Confirm current availability with your supplier for production quantities.
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