ROHM RB521SM
RB521SM variants from ROHM
RB521SM Overview
What changes between part numbers, and what to check before you lock the BOM — Rectifier Diodes.
RB521SM is a ROHM order-code family — not a single orderable MPN. This page lists 5 variants that share the same core device but differ in suffix fields (package, grade, reel/tube, electrical bin, etc.). Pick the exact full part number; substituting within the family without checking the datasheet often causes assembly or spec mismatches.
DIODE SCHOTTKY 30V 200MA EMD2 Other listed variants describe: DIODE SCHOTTKY 40V 200MA EMD2; DIODE SCHOTTKY 60V 200MA EMD2.
Suffix examples in this family: 30T2R, 40FHT2R, 40T2R, 60FHT2R, 60T2R. The characters after the base number usually encode package, temperature, or performance grade — compare the variant table column-by-column rather than assuming pin-compatible drops-in.
Example MPNs: RB521SM-30T2R, RB521SM-40FHT2R, RB521SM-40T2R, RB521SM-60FHT2R, RB521SM-60T2R.
Key Features
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 5 distinct suffix patternsExamples: 30T2R, 40FHT2R, 40T2R, 60FHT2R, 60T2R. Decode suffix meaning in the ordering notes under the variant table.
Target Applications
- Rectifier Diodes — design-in and field replacement
- BOM scrub where only the base prefix is known but suffix is TBD
- Second-source checks when the original MPN is constrained
Ordering Variants
Compare 5 RB521SM part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|
| RB521SM-30T2R | DIODE SCHOTTKY 30V 200MA EMD2 | ROHM | Active | Compliant | In Stock | |
| RB521SM-40FHT2R | DIODE SCHOTTKY 40V 200MA EMD2 | ROHM | Active | Compliant | In Stock | |
| RB521SM-40T2R | DIODE SCHOTTKY 40V 200MA EMD2 | ROHM | Active | Compliant | In Stock | |
| RB521SM-60FHT2R | DIODE SCHOTTKY 60V 200MA EMD2 | ROHM | Active | Compliant | In Stock | |
| RB521SM-60T2R | DIODE SCHOTTKY 60V 200MA EMD2 | ROHM | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on RB521SM map to package, grade, and reel options.
RB521SM uses a shared prefix; characters after the prefix encode orderable options. Two lines with the same prefix are not drop-in replacements unless the differing columns match your need.
Suffixes seen here: 30T2R, 40FHT2R, 40T2R, 60FHT2R, 60T2R.
Full MPN examples: RB521SM-30T2R, RB521SM-40FHT2R, RB521SM-40T2R, RB521SM-60FHT2R, RB521SM-60T2R.
Tip: photograph or copy the reel label — reel diameter, QTY per reel, and moisture sensitivity level (MSL) are often suffix-driven and won't show in the schematic.
How to Choose the Right RB521SM Rectifier Diodes
Match the footprint first
Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.
Electrical headroom
Compare voltage and current columns in the variant table. For RB521SM, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.
Temp grade letter matters
Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.
Copy the full MPN
Do not BOM only "RB521SM" — include the full suffix (e.g. 30T2R, 40FHT2R, 40T2R). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for RB521SM product family
Identity
Variant Parameters
Source RB521SM with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 5 ordering variants from ROHM. Our team supports active, EOL, and hard-to-find component sourcing.
- Original manufacturer parts with traceability options
- BOM upload and multi-line RFQ support
- Package, grade, and compliance verification
Frequently Asked Questions
Common technical questions about the RB521SM product family.