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B552-2T SCR Module Equivalent & Substitute Parts
Part Overview
The B552-2T is a 600V 1-Phase SCR Controller module manufactured by Sensata Technologies, designed for chassis mount applications with 25A surge capability. This part is classified as obsolete, making identification of active equivalent components essential for ongoing system support and new design implementations. The B552-2T features a 2 SCR configuration with standard gate trigger specifications suitable for AC control applications up to 240VAC.
Substiute Parts
Key Parameters
| Parameter | B552-2T |
|---|---|
| Manufacturer | Sensata Technologies |
| Category | Thyristors |
| Structure | 1-Phase Controller - All SCRs |
| Number of SCRs | 2 SCRs |
| Voltage - Off State | 600 V |
| Voltage - Gate Trigger (Vgt) Max | 2.5 V |
| Current - Gate Trigger (Igt) Max | 60 mA |
| Current - Non Rep. Surge (Itsm) | 250A @ 60Hz |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Chassis Mount |
| Package / Case | Module |
| Product Status | Obsolete |
| RoHS Status | RoHS Compliant |
Substitute Part Grouping Explanation
Substitution of the B552-2T is determined by the following critical parameters that must remain constant or be compatible with the original application:
- Structure: 1-Phase Controller - All SCRs configuration
- Number of SCRs: 2 SCRs
- Gate Trigger Specifications: Vgt Max 2.5V and Igt Max 60mA
- Surge Current Rating: 250A @ 60Hz
- Operating Temperature Range: -40°C ~ 125°C
- Mounting Type: Chassis Mount
- Package Type: Module configuration
- RoHS Compliance: Required
The B554-2 qualifies as a manufacturer-recommended substitute based on matching all critical electrical parameters and maintaining identical gate trigger and surge current specifications. The primary difference is an elevated off-state voltage rating (1.2kV versus 600V) and the addition of isolation barriers in the module package, both of which represent enhanced capability rather than incompatibility.
Parameter Comparison
| Parameter | B552-2T | B554-2 | Compatibility |
|---|---|---|---|
| Manufacturer | Sensata Technologies | Sensata-Crydom | Same manufacturer family |
| Structure | 1-Phase Controller - All SCRs | 1-Phase Controller - All SCRs | Identical |
| Number of SCRs | 2 SCRs | 2 SCRs | Identical |
| Voltage - Off State | 600 V | 1.2 kV | B554-2 rated higher |
| Voltage - Gate Trigger (Vgt) Max | 2.5 V | 2.5 V | Identical |
| Current - Gate Trigger (Igt) Max | 60 mA | 60 mA | Identical |
| Current - Non Rep. Surge (Itsm) | 250A @ 60Hz | 250A @ 60Hz | Identical |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | Identical |
| Mounting Type | Chassis Mount | Chassis Mount | Identical |
| Package / Case | Module | Module with Isolation Barriers | B554-2 includes isolation |
| Product Status | Obsolete | Active | B554-2 actively manufactured |
| RoHS Status | RoHS Compliant | RoHS Compliant | Identical |
Engineering Selection Recommendations
The B554-2 is the manufacturer-recommended substitute for the obsolete B552-2T. Selection of the B554-2 is supported by:
- Identical gate trigger voltage and current specifications (Vgt 2.5V, Igt 60mA)
- Matching surge current rating (250A @ 60Hz)
- Identical operating temperature range (-40°C ~ 125°C)
- Identical 2 SCR configuration and 1-Phase Controller structure
- Active product status with current manufacturing availability
- RoHS compliance maintained across both parts
- Enhanced voltage rating (1.2kV) provides additional design margin for applications originally specified at 600V
- Isolation barriers in the B554-2 package provide enhanced electrical isolation without compromising functional compatibility
The B554-2 is suitable for direct substitution in applications where the B552-2T was originally specified, with the understanding that the higher voltage rating and isolation features represent design improvements rather than functional deviations.
Frequently Asked Questions (FAQ)
Q: Can the B554-2 directly replace the B552-2T in existing designs?
A: Yes. The B554-2 maintains identical gate trigger specifications (2.5V, 60mA), surge current rating (250A @ 60Hz), and operating temperature range (-40°C ~ 125°C). The higher off-state voltage rating (1.2kV versus 600V) and isolation barriers represent enhanced capability compatible with B552-2T applications.
Q: What is the significance of the higher voltage rating on the B554-2?
A: The B554-2 off-state voltage rating of 1.2kV exceeds the B552-2T specification of 600V. This provides additional voltage margin and is compatible with applications originally designed for 600V operation.
Q: Are there packaging differences between these parts?
A: Both parts are chassis mount modules. The B554-2 includes isolation barriers within the module package, while the B552-2T does not. Both maintain identical mounting interfaces and form factors.
Q: Why is the B552-2T obsolete?
A: The B552-2T is classified as obsolete by the manufacturer. The B554-2 represents the active equivalent in the Sensata-Crydom product line with identical functional specifications.
Q: Are both parts RoHS compliant?
A: Yes. Both the B552-2T and B554-2 are RoHS compliant, meeting environmental and regulatory requirements for electronic component manufacturing.
Q: What is the inventory status for these parts?
A: The B552-2T has 970 pieces available as new original stock. The B554-2 has 1150 pieces available as new original stock in bulk packaging.
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