Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1336-BDB-SP56C |
| OEM Assembly Number | 74101-169-94 |
| Product Type | Gate Driver Board / Gate Driver PCB |
| Drive Family | Allen-Bradley 1336 AC Drive |
| Board Revision | C |
| Primary Function | Gate-drive control for the power-switching stage |
| Installation | Internal 1336 drive assembly |
| Lifecycle | Legacy / discontinued |
| Related Revision | 1336-BDB-SP56D |
The available spare-parts catalog identifies 1336-BDB-SP56C specifically as a Gate Driver Board, 74101-169-94. The same catalog lists SP56D with the same OEM assembly number, which is useful when evaluating revision-level replacements.
A separate technical record also ties 1336-BDB-SP56C directly to 74101-169-94.
Procurement caution: I would not publish a specific voltage or horsepower rating for SP56C without the host-drive catalog number. Several secondary listings incorrectly attach generic 220 V / frequency figures to this part; those claims conflict with the more reliable identification of SP56C as a gate-driver board.
Application Scenarios & Pain Points
A gate-driver board failure can be deceptive. The drive’s keypad or control electronics may still appear alive while the motor remains stopped because the power-switching stage is not being driven correctly.
Typical Applications
- 1336 Drive Maintenance: Used as a board-level replacement within compatible Allen-Bradley 1336 AC drive assemblies.
- Power-Stage Troubleshooting: Relevant when troubleshooting gate-drive signals, switching-device control, or related power-stage faults.
- Legacy Drive Repair: Particularly useful where the existing 1336 cabinet is still serviceable and replacing the entire drive would require control rewiring or commissioning.
- Spare-Part Inventory: Appropriate for facilities maintaining older 1336 equipment where a verified replacement PCB can reduce repair time.
Field Case:
A maintenance team may see normal control power and assume the main controller is the problem. Before changing SP56C, check the DC bus, gate-drive supply, switching devices, connectors, and visible heat damage. A failed IGBT can be the original fault—and installing a replacement gate board without addressing it can produce the same failure again.
1336-BDB-SP56C
Related Products
- 1336-BDB-SP56D — Later SP56 revision associated with the same 74101-169-94 OEM assembly number. It is the first part to investigate when evaluating a revision-level replacement, but host-drive compatibility should still be confirmed.
- 1336-BDB-SP55C — Related 1336 gate-driver board with OEM assembly 74101-169-91. Similar function, but a different assembly identification; it should not be substituted solely because the PCB appears similar.
- 1336-BDB-SP55D — Later revision associated with the same SP55 assembly family. Useful for comparing revision history around SP56C, but not automatically interchangeable.
- 1336-BDB-SP54D — Gate-driver board associated with OEM assembly 74101-169-89. It belongs to the same 1336 BDB family while serving a different application.
- 1336-BDB-SP51D — Gate-driver board with OEM assembly 74101-169-88. A related 1336 power-stage PCB, but its complete drive application must be checked before substitution.
- 1336-BDB-SP68C — Another 1336 gate-driver board, identified with 74101-169-97. Same broad function but a different assembly number and application.
- 1336-BDB-SP68D — Later SP68 revision using the same 74101-169-97 assembly identification. Useful when comparing later board revisions within the 1336 family.
- 1336-BDB-SP69C — Gate-driver board associated with 74101-169-99. It is a nearby member of the BDB family but should not be treated as a drop-in SP56C replacement.
The Engineer’s Guide: Field Pitfalls to Avoid
⚠️ Do Not Use Generic 220 V / 50 kHz Specifications as the Acceptance Basis
Some secondary listings describe as a generic 220 V control module and attach output-frequency specifications to it. That description conflicts with the documented identification of as a Gate Driver Board, 74101-169-94.
How to avoid it: Use the actual PCB label, OEM assembly number 74101-169-94, and host-drive catalog number as the primary procurement references.
⚠️ Do Not Assume SP56D Is Automatically Interchangeable
SP56D is associated with the same 74101-169-94 assembly number, which makes it worth investigating as a revision-level replacement. Still, revision compatibility should be confirmed against the installed drive and documentation.
How to avoid it: Photograph the existing board label and revision markings before removing it.
⚠️ Inspect the Power Section Before Installing the Replacement
Gate-driver boards interface directly with the switching stage. A shorted IGBT, damaged gate circuit, or abnormal DC-bus condition can destroy a replacement board.
How to avoid it: Lock out the drive, verify the DC bus is fully discharged, inspect the switching devices and gate connections, then perform controlled testing before returning the drive to service.
Frequently Asked Questions (FAQ)
What is Allen-Bradley 1336-BDB-?
It is a gate-driver PCB used in the Allen-Bradley 1336 AC drive family. Its documented OEM assembly number is 74101-169-94.
What is the OEM part number for 1336-BDB-?
The associated assembly number is 74101-169-94. For purchasing, retain both identifiers:
1336-BDB- / 74101-169-94.
Is 1336-BDB-SP56D related to ?
Yes. Available spare-parts documentation lists both and with assembly number 74101-169-94. That makes an important candidate when investigating a later revision, though the exact host-drive compatibility still needs verification.
Can I substitute another 1336-BDB board if the connectors fit?
Not safely based on connector fit alone. The BDB family contains numerous boards with different assembly numbers and drive applications. For example, SP55C, , SP68C, and SP69C have different OEM assembly numbers.
Match the complete drive catalog number + board number + OEM assembly number.
What should I verify when purchasing a refurbished ?
Request:
- Actual PCB photographs.
- marking.
- 74101-169-94 assembly identification.
- PCB revision.
- Connector condition.
- Inspection for heat damage and oxidation.
- Gate-drive functional test results.
- Host-drive configuration used during testing.
- Test report.
- Warranty terms.
A simple continuity test is not enough for a gate-driver PCB.
Does have a fixed 220 V or 50 kHz rating?
I would not use those figures as specifications for . Some secondary pages publish them, but the stronger parts documentation identifies the item simply as a Gate Driver Board, 74101-169-94, without those claimed operating specifications.
For an engineering or procurement datasheet, the host-drive voltage and horsepower should be verified from the actual drive nameplate rather than inferred from alone.
Is still a current product?
It should be treated as a legacy 1336 spare part. Current availability is therefore a sourcing issue rather than an indication of current production status. When buying surplus or refurbished stock, the actual board marking, assembly number, physical condition, and test evidence matter more than a generic “in stock” claim.
