Reference Designator

What is the correct Reference Designator for Terminal Block?
What is the correct Reference Designator for Coin Battery Holder?

I might use J or TB for the terminal block.

B might be appropriate for the coin battery.

I agree with Cody's descriptions. The "J" refers to a Jack, female connector. If you intend to use a male connector, you would use "P" for plug. As for the coin cell, "B" works or "BT". In some cases "B" is used to represent a motor or blower.

If you have access to IPC standards (www.ipc.org), IPC-2612 is the "standard for schematic symbol generation". If not, Mentor Graphics has a nice article on PCB Design (http://blogs.mentor.com/tom-hausherr/blog/tag/reference-designator/).

-Bob C.

From ANSI/IEEE 315 clause 22.4 the class designation of a terminal block is "TB" and the class designation letters for a battery are "BT" with the battery holder being "XBT", just like a fuse is "F" with the fuse holder being "XF".

Class letter "J" does not mean the connector has female/socket terminals but is the most fixed of a connector pair. Likewise "P" does not mean the connector has male/pin terminals but is the most movable of a connector pair. This is how you would reference designate a sexless pair of connectors.

I did not realize the meaning behind J and P. I like that it is based upon the most movable or fixed, especially on connectors that are difficult to identify gender.

While doing some research on schematic symbol rules I came across this document referenced at www.k-state.edu; Technote 8, April 2008, "Guidelines for Drawing Schematics", written by Tim J. Sobering at this link: http://www.k-state.edu/ksuedl/publications/Technote 8 - Guidelines for Drawing Schematics.pdf

Here are three standards I recommend you have:
--ANSI/IEEE Std 315-1975 (includes 315A-1986), graphic symbols and class designation letters. If you can get IEC 60617 series that would be a plus but the symbols in IEEE 315 marked with IEC come from IEC 60617 and, as far as I understand, are always the preferred graphic symbol to use.
--ANSI/ASME Y14.44-2008, reference designation methods. This replaces ANSI/IEEE Std 200-1975. Like IEEE 200 the Unit Numbering Method is explained and is preferred over the Block Numbering Method.
--ANSI/IEEE/ASTM SI 10 or NIST Special Publication 811, SI (System International, the Modern Metric System). [SP 811 is a no charge PDF download.]

From what I have seen in IPC-2612 and IPC-2612-1 they should have just referred to the standards that already exist instead of trying to "improve" or stipulate otherwise.

Plugs (P) and jacks (J) can have either pin contacts, socket contacts, or a combination of pin and socket contacts. Gender nomenclature applies more to pin (male) and socket (female) contacts, where plugs are simply the most movable, and jacks the least movable of a connector pair. Connector reference designations simply assign a number to either P or J, such as P5 and J3. Designation of individual contacts of a connector can be numbers, uppercase single or double letters, lowercase single or double letters, and even symbols, and are associated by a dash (-) to the reference designation of their connector, such as P5-12 and J3-aa. Electrical source contacts are usually sockets which are safely recessed into the connector face. Observing these principles have never failed me and have minimized confusion in describing connections.

Reference designation (letter symbol) for a terminal block is simply TB, such as TB6, and its terminals are treated just like connector contacts, such as TB6-3.

Coin battery holders can be treated like IC sockets by using letter symbol X placed as a prefix in front of the battery's letter symbol, such as XBT1 for connecting battery BT1.

Even though this answers a 3 year old question, it remains relevant.

DEAR....
MAY BE....

J or TB for the terminal block. AND

B appropriate for coin battery.
THANKS....