Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Part Number | 1336-BDB-SP72D |
| Product Type | Gate Driver PC Board |
| Drive Family | 1336STE / 1336STEF |
| Drive Voltage | 480 VAC |
| Drive Power Rating | 250 HP |
| Frame Size | F Frame |
| Primary Function | Gate-drive control for power switching devices |
| Application | High-power adjustable-frequency AC drive |
| Board Category | Drive power electronics |
| Predecessor Designations | 1336-BDB-SP72A, 1336-BDB-SP72C |
| Replacement Status | SP72D replaced earlier SP72A/C versions |
| Manufacturer Lifecycle | Discontinued |
| Documented Discontinuation | March 30, 2020 |
| Approx. Listed Weight | 1.20 kg / 2.64 lb |
Rockwell’s spare-parts catalog lists 1336-BDB-SP72D as a PCB, Gate Driver, 1336STEF, 460V, 250 HP, F-frame; current secondary records identify the same part for 480 V, 250 HP, F-frame equipment.
For procurement, I would use the actual drive nameplate to resolve the 460/480 V terminology rather than treating those figures as contradictory. The 1336 family documentation commonly uses nominal voltage classes, while equipment listings may state the nominal line rating differently.
Application Scenarios & Pain Points
A gate-driver PCB on a large 1336 drive is rarely the only component worth checking after a power-stage fault. If a power transistor has shorted, replacing the board without checking the associated switching devices can turn one repair into two.
Typical Applications
- 1336STEF F-Frame Drives: The documented application is a 250 HP F-frame drive within the 1336STE family.
- Large Industrial Motor Control: Appropriate for legacy high-power motor-drive systems where the existing 1336 equipment remains part of the production process.
- Drive Power-Section Repair: The board provides the gate-drive circuitry required to control the power-switching devices. It should therefore be evaluated alongside the DC bus, power modules, gate wiring, and protection components.
- Legacy Drive Refurbishment: Particularly relevant when replacing an obsolete drive is difficult because of cabinet dimensions, motor-cable changes, commissioning work, or plant validation requirements.
Field Case:
When a 250 HP drive reports a power-stage fault, start with isolation and DC-bus discharge verification. Then check the power devices and gate-drive paths before fitting the replacement PCB. A clean-looking BDB board can still fail immediately if the original shorted power device remains connected.
1336-BDB-SP72D
Related Products
- Allen-Bradley 1336-BDB-SP72A — Earlier SP72 gate-driver designation. Rockwell’s parts catalog identifies the A/C versions as obsolete and replaced by SP72D.
- Allen-Bradley 1336-BDB-SP72C — Earlier revision of the same SP72 gate-driver family. It was replaced by 1336-BDB-SP72D; confirm the installed drive before substitution.
- Allen-Bradley 1336-BDB-SP73D — Gate-driver PCB for 1336STEF, 460 V, 300 HP, F-frame drives. Similar family and frame, but higher horsepower; not a direct substitute for SP72D.
- Allen-Bradley 1336-BDB-SP74D — Gate-driver PCB for 1336STEF, 460 V, 350 HP, F-frame drives. Same basic board category but a different power rating.
- Allen-Bradley 1336-BDB-SP75D — Gate-driver PCB for 1336STEF, 480 V, 400 HP, F-frame applications. It is a higher-power variant and should not be substituted without engineering confirmation.
- Allen-Bradley 1336-BDB-SP39D — Gate-driver PCB for 1336STEF, 460 V, 250 HP applications. The same horsepower does not make it automatically equivalent; frame and drive configuration must be checked.
- Allen-Bradley 1336-BDB-SP71D — Gate-driver PCB for 1336TE, 575 V, 700 HP, H-frame drives. Related power-electronics hardware, but a completely different drive rating/application.
- Allen-Bradley 1336-MCB Series — Main control-board assemblies for 1336 drives. These handle drive control functions and should not be confused with the BDB gate-driver section.
The Engineer’s Guide: Field Pitfalls to Avoid
⚠️ Do Not Substitute by Horsepower Alone
SP72D is identified for a 250 HP F-frame application. Other F-frame BDB boards cover 300, 350, and 400 HP ratings.
How to avoid it: Match drive series + voltage class + horsepower + frame + complete catalog number. The BDB prefix is not enough.
⚠️ Check the SP72 Revision History
The Rockwell parts catalog identifies SP72A/C as obsolete and replaced by SP72D.
How to avoid it: Photograph the existing board before removal and record every board-level identifier. A supplier offering SP72C should not be treated as offering the same revision as .
⚠️ Inspect the Power Devices Before Installing the New Board
A failed IGBT or other power-switching component can be the original cause of the gate-board failure.
How to avoid it: With the drive fully isolated and the DC bus safely discharged, inspect and test the associated power devices and gate circuits according to the applicable service procedure. Do not apply full line power immediately after a blind board swap.
Frequently Asked Questions (FAQ)
What is Allen-Bradley 1336-BDB-?
It is a Gate Driver PC Board for a high-power 1336STE/1336STEF drive configuration. Rockwell’s spare-parts documentation identifies it for 250 HP, F-frame equipment.
What drive does 1336-BDB- fit?
The strongest parts-catalog identification is:
1336STEF — 460 V — 250 HP — F-frame.
Secondary equipment records describe the same part as 1336STE, 480 V, 250 HP, F-frame.
For an actual replacement, use the drive’s nameplate and complete catalog number as the final compatibility reference.
Is 1336-BDB- the same as 1336-BDB-SP73D?
No. Both are F-frame 1336STEF gate-driver boards, but is associated with 250 HP, while SP73D is associated with 300 HP.
That difference is significant because the gate-drive circuitry is matched to the associated power section.
What replaced 1336-BDB-SP72A and SP72C?
Rockwell’s spare-parts catalog states that 1336-BDB-SP72A and 1336-BDB-SP72C were obsolete and replaced by .
That does not mean every old board can be swapped without checking the complete drive configuration.
Is still manufactured?
Available records identify the part as discontinued by the manufacturer on March 30, 2020.
For a plant-maintenance purchase, actual condition should therefore be stated clearly: new surplus, unused old stock, repaired, or fully tested refurbished.
What should I request when buying a refurbished ?
Request:
- Actual PCB photographs
- Complete marking
- Board revision/date code
- Connector condition
- Power-stage interface inspection
- Evidence of gate-drive testing
- ESD-safe handling
- Test report, where available
- Warranty terms
A visual inspection is not enough. For a high-power gate-drive board, the meaningful question is whether the assembly has been electrically verified under an appropriate test setup.
Can I use in place of another 1336 BDB board?
Not without checking the application. The 1336 BDB family contains rating- and frame-specific boards. For example, SP73D is listed for 300 HP F-frame equipment and SP74D for 350 HP F-frame equipment.
Bottom line: match the exact board designation to the drive nameplate and power-stage configuration before installation.
