NFC Tag Form Factors
NFC tags come in dozens of physical form factors — from sub-millimeter bare inlays to rigid key fobs rated for –40 °C. Choosing the right form factorform factorPhysical shape/packaging of NFC tags: stickers, cards, wristbandsView full → is as important as choosing the right chip. This guide surveys the major categories, their trade-offs, and selection criteria.
Form Factor Overview
| Category | Thickness | Typical Size | IP Rating | Unit Cost | Best For |
|---|---|---|---|---|---|
| Dry inlayDry inlayNon-adhesive NFC inlay for card body laminationView full → | 0.1–0.2 mm | 25–75 mm | None | $0.05–$0.15 | Converters, embedded |
| Wet inlayWet inlayAdhesive-backed NFC inlay ready for surface applicationView full → | 0.1–0.2 mm | 25–75 mm | None | $0.08–$0.20 | Labels, tickets |
| Paper label | 0.1–0.3 mm | 25–100 mm | None | $0.10–$0.30 | Consumer retail |
| PET label | 0.1–0.2 mm | 25–75 mm | IPX3 | $0.15–$0.40 | Food, pharma |
| PVC card | 0.76 mm | 85.6×54 mm | IPX4 | $0.50–$2.00 | Access, loyalty |
| Wristband | 1–4 mm | 220 mm circumference | IPX6/IP67 | $0.80–$3.00 | Events, hospitals |
| Key fob | 3–8 mm | 45×28 mm | IP67/IP68 | $1.50–$5.00 | Access control |
| Disk/coin | 2–5 mm | ⌀13–30 mm | IP68 | $1.00–$8.00 | Industrial, on-metal |
| On-metal plate | 3–10 mm | 30–80 mm | IP69K | $2.00–$15.00 | Asset tracking, metal |
Inlays: The Raw Ingredient
An nfc-inlay is the fundamental building block — an antenna and IC bonded to a PET or paper carrier with no additional packaging. There are two subtypes:
dry-inlay: Antenna and IC on PET substrate with no adhesive layer. Designed for insertion into another product (embedded in a passport, sewn into a garment, laminated into a card). The converting industry uses dry inlays as input to label lines.
wet-inlay: Dry inlay plus a pressure-sensitive adhesive and a release liner. Can be applied directly to a surface. Most retail NFC labels start as wet inlays that are then printed and overlaminated by a converter.
Choosing inlay vs. finished product: - Volumes > 100,000/year → buy inlays and convert in-house or via converter. - Volumes < 10,000/year → buy finished labels or cards; tooling cost of custom conversion is not justified.
Labels and Cards
Paper and PET labels are the dominant form factor for consumer-facing NFC deployments (product authenticationauthenticationIdentity verification of NFC tags/readers via passwords or cryptographyView full →, marketing, packaging). Key specifications:
- Adhesive strength: Permanent vs. removable. Removable allows repositioning; permanent (acrylic adhesive, > 1,000 g/in peel) prevents tampering.
- Printability: Thermal transfer, inkjet, laser — verify label stock compatibility before specifying.
- Environmental resistance: PET outperforms paper in humidity, oils, and UV. For outdoor use, add UV-protective laminate.
PVC cards (CR80 format, 85.6×54 mm) are the standard for access control, loyalty, and employee ID. They withstand flexing, solvents, and temperatures from –25 °C to +50 °C.
Wristbands, Key Fobs, and Custom
Wristbands are the preferred format for events and healthcare. Silicone wristbands withstand showers and sweat; disposable Tyvek wristbands are single-use for event access. The form-factor determines read orientation — wristbands must be readable from any wrist angle, which requires a large, forgiving antenna.
Key fobs embed a full PVC card's electronics into a compact shape. They tolerate keychain abuse (drop impact, abrasion) and are available in IP67/IP68 ratings for outdoor use.
Custom form factors — embedded in furniture, clothing, packaging, or product housings — require partnering with a tag manufacturer who can custom-design the antenna to the available space. Minimum viable antenna size for a readable tag at 13.56 MHz is approximately 15×15 mm on a non-metallic substrate.
Use the NFC Tag Cost Calculator to compare total cost across form factors at your target volume. For chip selection within any form factor, use the NFC Chip Selector.
See also: NFC on Metal Surfaces for specialized on-metal form factors.