TL431ACZ-AP is an STMicroelectronics programmable shunt voltage reference in TO-92, ammopack (AP, 2000 per pack) — 2.495 V typical reference with 1% initial accuracy (A grade), adjustable output from 2.5 V to 36 V via two external resistors, 1 mA to 100 mA cathode current range, 0.22 Ω typical dynamic impedance, 0 to +70 °C. The shunt-reference topology is the selection point: it behaves like a programmable Zener that sets its own reference voltage, so one part serves as a precision voltage reference, a comparator threshold, or the error amplifier in a flyback/forward SMPS feedback loop — the dominant use case for this industry-standard part. Selection advice: the code decodes as TL431 + A (1% accuracy) + C (0 to +70 °C) + Z (TO-92) + AP (ammopack) — match every character, because the B (0.4%) and I (−40 to +105 °C) variants and the SO-8/bulk packings are separate orderables. The 100 ppm/°C typical temperature coefficient makes it a reference for cost-sensitive loops, not for precision ADC references. ST lists TL431ACZ-AP as Active. Evidence: ST TL431 datasheet ordering table and distributor listings confirm 1% accuracy, 2.5–36 V, 1–100 mA, TO-92 and ammopack. Match the full TL431ACZ-AP code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.
TL431ACZ-AP is a Adjustable shunt voltage reference from STMicroelectronics, orderable in the TO-92 package. The ordering code fixes the exact configuration you receive — package, grade and packing — so procurement starts with matching this code character-for-character against your BOM, not just the base series name.
When you request a quote, include the full ordering code, the target packing format (reel, tube, tray or cut tape), your quantity and any date-code or lot requirements. We reconfirm manufacturer, suffix, package, date code and traceability against the actual offered lot before any commercial quote is issued, and every RFQ gets a reply within 24 hours.
Exact MPN, manufacturer and suffix
Supplier type, quantity and freshness
Lot, labels, photos and documents
Price, lead time, payment and shipping
Browse existing catalog records — same series first, then the same category and manufacturer. These are not confirmed replacements; compatibility requires engineering review.
Every suffix in a manufacturer ordering code identifies one exact orderable device — package, temperature grade, packing format or a revision. TL431ACZ-AP names the TO-92 configuration; a code that differs by even one suffix character may be a different device. Always quote the complete code exactly as it appears on your BOM.
The package (TO-92) is the physical form of the device itself. Packing describes how the devices are delivered — reel, tube, tray or cut tape. The same ordering code can ship in different packing formats depending on the lot, so confirm the required packing format when you submit your RFQ.
Traceability evidence — lot and date-code information, labels and photos — is confirmed per lot at quotation time, because it depends on the actual lot offered. Tell us which documents your receiving inspection requires when you submit the RFQ, and we will confirm what can be provided for the offered lot.
Add TL431ACZ-AP to your RFQ with the complete ordering code, the manufacturer (STMicroelectronics), your quantity, the target packing format and any date-code requirements. We reply to every RFQ within 24 hours.