Schlage 8843T MIFARE DESFire EV3 Multi-Technology Thin Keyfob — Premium High-Security Credential for Chicago

Schlage 8843T MIFARE DESFire EV3 Multi-Technology Thin Keyfob

The Schlage 8843T is the premium multi-technology thin keyfob in Allegion’s Schlage credential lineup — combines 125 kHz proximity capability AND 13.56 MHz contactless smart card with MIFARE DESFire EV3 (4K byte / 32K bit capacity) in one credential. MIFARE DESFire EV3 sits at the top of the DESFire family — the fob to spec where credential cloning, replay, and side-channel attacks actually have to be defeated, not just discouraged: medication rooms, server closets, buildings that have already found a copied fob in circulation.

What’s Confirmed by the Schlage / Allegion Spec

These specifications come from Allegion’s published 8843T product documentation:

• Frequencies: 125 kHz proximity AND 13.56 MHz contactless smart card
• Smart standard: MIFARE DESFire EV3
• Smart memory: 4K byte / 32K bit capacity
• Encoding: Pre-encoded with manufacturer-selected format, facility code, and number range
• Pack quantity: 100 fobs per box
• Dimensions: 1.77” H × 1.18” W × 0.06” D (≈ 45 × 30 × 1.5 mm)
• Form factor: Thin multi-technology keyfob

Why MIFARE DESFire EV3 Specifically

MIFARE DESFire EV3 is the third generation of NXP’s DESFire family. It adds over earlier generations:

• Higher AES key strength in mutual authentication
• Hardware-side counter measures against side-channel attacks
• Larger memory (up to 8 KB on some DESFire EV3 cards; 4K byte / 32K bit on the Schlage 8843T)
• Multi-application support with strict isolation between application files (one credential covers access control, secure printing, time / attendance, biometric templates, payment, etc.)
• Common Criteria / FIPS-aligned hardware security in the DESFire EV3 chip family

When an audit — DEA storage rules at a clinic, an insurer’s security review, an IT compliance framework — calls out credential cloning, MIFARE DESFire EV3 is the standard that closes the finding.

8843T vs. 8643T — Premium vs. Standard DESFire

Feature	8843T (this page)	8643T
Smart-card standard	MIFARE DESFire EV3 (4K byte / 32K bit)	DESFire EV3 (standard)
125 kHz Prox compatibility	Yes	Yes
Memory capacity	4 KB	(per Allegion documentation)
Best fit	Premium high-security — med rooms, server closets	Standard DESFire EV3 commercial
Relative cost	Higher	Lower

For high-security and audit-driven projects the 8843T is the right pick. For standard commercial DESFire EV3 deployments, the 8643T covers the same role at a lower price point.

Schlage Keyfob Family Comparison

Keyfob	Technology	Best Fit
9651T	MIFARE Classic 1K (single-tech)	Schlage smart-card-standardized properties
9691T	125 kHz Prox + MIFARE Classic	Phased Prox-to-Smart migration
8643T	DESFire EV3 multi-tech	Standard DESFire EV3 deployments
8843T (this page)	MIFARE DESFire EV3 (4K byte) multi-tech	Premium high-security doors

Where the Schlage 8843T Wins in Chicago

• Clinic restricted-area access — pharmacy, medication storage, records (DEA / HIPAA compliance)
• Server rooms and IT closets at small offices with real data behind the door
• Multi-application MIFARE DESFire EV3 deployments (access + secure printing + biometric)
• Premium commercial offices with high-value information assets
• Multi-tenant residential premium-tier amenity-area access on DESFire EV3 infrastructure

Local Chicago Coverage

Vidimost installs and supplies the Schlage 8843T across the full city of Chicago for premium high-security MIFARE DESFire EV3 deployments.

Recommended Pairings

• Schlage 8643T — standard DESFire EV3 sibling for non-premium commercial
• Schlage 9651T / 9691T — MIFARE Classic alternatives for non-DESFire deployments
• Schlage MT15 / MTB15 — Schlage MT-series readers that work with the 8843T’s multi-tech credential mix
• HID Seos 5266 — alternative high-security 13.56 MHz keyfob from HID Global for properties on HID iCLASS SE / Signo readers

Professional Installation by Vidimost

Vidimost LLC supplies the Schlage 8843T across Chicago for premium high-security commercial deployments. Full-scope service includes site walkthrough, security-tier assessment (MIFARE DESFire EV3 vs. iCLASS Seos vs. standard DESFire), bit-format and facility-code coordination, pre-encoding workflow with Allegion, and deployment to authorized users in 100-fob pack quantities. Contact us for a free site walkthrough and quote.