Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1336-BDB-SP70C |
| Product Type | Gate Driver PC Board |
| Drive Family | Allen-Bradley Bulletin 1336 |
| Drive Application | 1336STEF |
| Power Class | 700 HP |
| Frame | H |
| Board Revision | C |
| Primary Function | Gate-drive control for the inverter power stage |
| Installation | Internal drive assembly |
| Related Revision | 1336-BDB-SP70D |
| Lifecycle | Legacy / discontinued |
The available part records identify 1336-BDB-SP70C as a Gate Driver PC Board and list SP70D as a closely related later part. SP70D is specifically identified as a 1336STEF Frame H, 700 HP gate-driver board.
Important data-quality note: I would not publish a standalone voltage figure for SP70C without the exact host-drive catalog number. The web listings found for SP70C contain a clear model-number mix-up with 1336-BDB-SP7C, which is a different part.
Application Scenarios & Pain Points
A 700 HP legacy drive is normally connected to equipment where an unexpected stop can affect an entire production section. The board may be physically small compared with the drive cabinet, but its failure can prevent the inverter from switching at all.
1336-BDB-SP74C
Typical Applications
- High-Power 1336STEF Drives: SP70C belongs to the large-frame gate-driver board family; the later SP70D is documented for Frame H / 700 HP service.
- Legacy Drive Maintenance: A board-level repair can make sense when the existing motor, cabinet, control wiring, and power section remain serviceable.
- Gate-Drive Fault Diagnosis: Consider the board when the control electronics appear alive but the inverter section fails to produce the expected switching behavior.
- Critical Spare Inventory: Plants with several compatible high-power 1336 drives may prefer a verified board on the shelf rather than waiting until an obsolete assembly fails.
Field Case:
A high-power drive can show normal control indications while the motor remains unavailable. Before replacing SP70C, inspect the DC bus, power semiconductors, gate wiring, driver supply, and board connectors. A failed IGBT or gate circuit can be the real root cause; replacing the PCB alone may simply repeat the failure.
Related Products
- 1336-BDB-SP70D — Later SP70 revision. It is identified as a 1336STEF Frame H, 700 HP gate-driver PCB and is the most important comparison part when evaluating a C-to-D revision change.
- 1336-BDB-SP70A — Earlier SP70 revision listed alongside SP70C and SP70D. Useful when identifying an older board during legacy maintenance.
- 1336-BDB-SP72D — Related 1336 gate-driver board in the same general high-power family. It should be evaluated against the complete drive configuration rather than substituted based on physical similarity.
- 1336-BDB-SP74C — Another 1336 BDB gate-driver board appearing in the same spare-parts family. Its different SP designation means the host-drive application must be checked before substitution.
- 1336-BDB-SP63D — A smaller 1336 gate-driver board used for a substantially lower-power application. It illustrates why the BDB family cannot be matched simply by connector or board appearance.
- 1336-BDB-SP44D — Another high-power 1336STEF G-Frame gate-driver PCB, documented for 350 HP service. Different frame and power class make it unsuitable as a routine replacement.
- 1336-BDB-SP45D — 1336STEF G-Frame gate-driver PCB for 400 HP service. Useful for comparison within the high-power BDB range, but not a direct substitute for a Frame H application.
The Engineer’s Guide: Field Pitfalls to Avoid
⚠️ Do Not Confuse With SP7C
This is the biggest documentation trap. Some online records use 1336-BDB-SP7C specifications—575 VAC and 7.5 HP—while labeling the page 1336-BDB-SP70C. Those are not interchangeable identifiers.
How to avoid it: Require a photograph of the physical nameplate/PCB marking showing the complete 1336-BDB-SP70C number.
⚠️ Do Not Assume Is Automatically a Drop-In Replacement
is clearly associated with the same general 700 HP Frame H application, but revision changes can involve component, jumper, or interface differences.
How to avoid it: Verify the host-drive catalog number and revision against the applicable Rockwell documentation before approving a C-to-D substitution.
⚠️ Do Not Energize a Replacement Board Before Checking the Power Stage
A gate-driver PCB can be damaged by an existing shorted switching device.
How to avoid it: Apply lockout/tagout, confirm the DC bus is discharged, inspect the power devices and gate circuits, check driver supplies, and verify connector condition before applying power.
Frequently Asked Questions (FAQ)
What is Allen-Bradley 1336-BDB-?
It is a gate-driver PC board for the Allen-Bradley 1336 drive family. Available records identify it specifically as a gate-driver board, while the closely related is documented for 1336STEF, Frame H, 700 HP.
Is 1336-BDB- the same as 1336-BDB-SP7C?
No. This distinction is critical. Several secondary listings have apparently copied the SP7C specifications onto pages. The SP7C information describes a much smaller 575 V / 7.5 HP application and should not be used as the specification for .
Can 1336-BDB- replace ?
It is the obvious revision candidate because both belong to the SP70 family, and is documented for the 700 HP Frame H application.
Before installation, verify the exact host-drive catalog number and revision requirements. Do not approve the substitution solely from the suffix change.
Is a complete 700 HP VFD?
No. It is a gate-driver PCB, not a complete drive. The board participates in controlling the drive’s power-switching stage and depends on the surrounding power and control assemblies.
What should I verify when purchasing a refurbished ?
Ask for:
- Clear photograph showing
- PCB revision marking
- Host-drive model used for testing
- Connector and terminal inspection
- Evidence of heat or oxidation damage
- Gate-drive functional test results
- Test report
- Warranty terms
For a high-power legacy board, “powers on” is not a sufficient acceptance criterion.
What lead-time information should a buyer request?
Because is a legacy component, ask the supplier to distinguish physically available stock from material that still needs to be sourced. Request the actual board photographs and test report before committing to a critical shutdown schedule.
Is still a current-production part?
It should be treated as a legacy spare. The existence of later inventory does not by itself establish current OEM production of . For procurement, the exact revision and physical board marking should be documented before purchase.
