Match the regulator to the job
Fixed linear, shunt reference or adjustable — each has a natural home. Use this cheat sheet to pick the topology, then jump to the in-stock part.
| Part we stock | Type | Best for |
|---|---|---|
| l7805cv | Fixed 5 V linear (TO-220) | Higher-current 5 V rails |
| lm78l05acz | Fixed 5 V linear (TO-92) | Low-current legacy rails |
| ams1117-3-3 | Fixed 3.3 V LDO | General MCU / logic rail |
| xc6206p332mr | Fixed 3.3 V LDO (SOT-23) | Space-constrained 3.3 V |
| me6211c33m5g | Fixed 3.3 V LDO | Low-dropout, low-noise |
| rt9193-33gb | Fixed 3.3 V LDO | RF / analog supply |
| mcp1700t-3302e-tt | Fixed 3.3 V LDO | Ultra-low quiescent current |
| ht7333-a | Fixed 3.3 V LDO | Battery-powered designs |
| lm317t | Adjustable linear (TO-220) | Variable / bench rails |
| tl431 | Adjustable shunt reference | Feedback, references, clamps |
Three questions to answer first
- How much headroom? Gap under ~1.5 V → linear; larger gap at high current → switching.
- How quiet? Analog/RF rails favour an LDO with good PSRR and low noise (ME6211, RT9193 class).
- How precise? For a reference or a feedback divider, use a shunt reference such as the TL431 rather than a regulator.
All parts above are in stock in the power management category.
Frequently asked questions
When should I use a TL431 instead of an LDO?
Use the TL431 as a precision shunt reference or in a feedback network; use an LDO when you need to source current to a load.
Which regulator is best for an analog 3.3 V rail?
Choose a low-noise LDO such as the RT9193 or ME6211 and add input/output filtering.
Do you offer adjustable regulators?
Yes — the LM317T covers most bench and variable-rail needs.
Recommended next steps
If you are sourcing any of the parts mentioned in this guide, we can help you confirm stock, pricing, and lead times quickly.
- Upload your BOM — send your full parts list and receive a consolidated quote within 2 business hours.
- Browse related in-stock lines: Power Management ICs.
- Contact our team for hard-to-find or end-of-life components.
JTDZ Tech is an independent distributor of electronic components. Brand and part numbers are used for identification and cross-reference only; all trademarks belong to their respective owners. Always verify pinout, electrical limits and qualification status against the original device before substituting.
