Dual Interface Card

What a dual interface card is

A dual interface card is a card with a contact interface and a contactless interface. On the cards described here both interfaces lead to a single secure chip: the gold contact pad on the surface, and a contactless antenna embedded in the card body. The same chip, memory and keys serve both, so a card can be inserted into a contact reader or tapped on a contactless reader and behave as one credential. This is the construction used by modern EMV bank cards, national ID cards and many transit and campus cards.

One chip, two interfaces

The contact interface follows ISO/IEC 7816, which defines the physical contact pad, the electrical signals and the command protocol used when the card is inserted. The contactless interface follows ISO/IEC 14443 at 13.56 MHz, the proximity standard used for tap-and-go. Both interfaces are wired to the same silicon die, so an application and its data live once on the card and are available whichever way the card is read, where the application is enabled on that interface.

Dual interface versus combi card

They are different products. A dual interface card is a card with a contact interface and a contactless interface, here both on one chip. A combi card is a multi-chip card: two or more separate chips in one card body, usually contactless, such as 125 kHz + 13.56 MHz or HF + UHF, each with its own reader. The combi card page compares the two side by side.

Chip and card operating system

Dual interface cards usually run a card operating system rather than a fixed-memory chip. Java Card is the most common platform: applets for payment, identity or transport are loaded onto the secure element and managed under GlobalPlatform. See the Java Card page for the operating system side. The exact chip, applet set and security certification are defined by the issuing scheme, so tell us the platform and profile your project requires.

Personalisation: one chip, loaded once

Because there is one chip, the application, keys and data are loaded once and then serve both the contact and the contactless side; check which interfaces are enabled in the offered card configuration. Loading a payment or identity credential onto the secure element is done by the issuing scheme or an authorised, certified personalisation bureau; we do not issue banking or government credentials. We supply dual interface card bodies and inlays to your agreed specification, with print, magnetic stripe, signature panel, embossing and hologram options. Confirm in the quotation which party performs chip personalisation and which does print and physical finishing.

Testing a sample on both interfaces

1. Contact side. Insert the sample in an ISO/IEC 7816 contact reader. Check that the ATR and protocol (T=0 or T=1) match what your software or tooling expects, then select your application and run its commands.
2. Contactless side. Present the same card to a 13.56 MHz reader that supports ISO/IEC 14443-4 APDUs, such as the PC/SC ACR122U. Select the same application and read the same stored data; it should match what the contact side returned. Responses that include a counter, a random challenge or a cryptogram differ on every call by design, so compare stored data, not those responses.
3. Enabled interfaces. Confirm that every application you need is enabled on both interfaces in the offered card configuration.
4. Door readers separately. If the card must also open a MIFARE door reader, test that on the installed reader. On NXP's JCOP 4 platform, for example, MIFARE Classic, Plus and DESFire implementations are options, so dual interface capability alone does not establish MIFARE emulation.
5. Scheme cards. For payment or government ID cards, the issuing scheme and its certified bureau handle personalisation and approval; use the sample to check the card body, print and finishing against your specification.

The ACR122U and the µFR Classic CS are contactless readers, so the contact test needs a contact smart-card reader.

Specification

Where dual interface cards are used

• Payment: EMV bank cards that work in a chip terminal and as a contactless tap.
• Government and national ID: identity, health and residence cards read at contact desks and contactless gates.
• Transit and campus: one card for fare gates (contactless) and point-of-sale or enrolment (contact).
• Corporate and PKI: logical-access cards that log a user into a PC by contact and open a door by tap.

Ordering

For a dual interface order, state the chip or platform (for example a Java Card profile), the required interfaces and security, the artwork and any magnetic stripe or signature panel, and who performs chip personalisation. Send the details through the inquiry form, by email or on WhatsApp.

Compare the Java Card operating system, MIFARE DESFire cards for contactless-only credentials, printed RFID cards for the artwork keep-out zone around the contact module, and the full RFID cards range.