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Redstone Torch

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[edit]Redstone Torch
Redstone (Torch, Inactive).png
Redstone (Torch, Active).png
Redstone Torch
Type

Non-solid Block

Physics

No

Transparency

Yes

Luminance

Yes, 7 (when on)

Blast resistance

0

Hardness

0

Tool

Any tool

Renewable

Yes

Stackable

Yes (64)

Flammable

No

First appearance

Alpha 1.0.1

Drops

Itself

Data values
Torch off state
dec: 75 hex: 4B bin: 1001011
Torch on state
dec: 76 hex: 4C bin: 1001100
Name
Off-state
unlit_redstone_torch
On-state
redstone_torch

A redstone torch is a non-solid block that can be used as an invertable redstone power source.

Obtaining[edit]

Redstone torches can be mined using any tool, or without a tool.

Crafting[edit]

Ingredients Crafting recipe

Redstone +
Stick




Grid layout Arrow (small).png Redstone Torch

Redstone

Stick

Usage[edit]

Redstone torches can be used as crafting ingredients or redstone components.

Crafting ingredient[edit]

Redstone torches can be used to craft activator rails, redstone comparators, and redstone repeaters.

Name Ingredients Crafting recipe

Activator Rail

Iron Ingot +
Stick +
Redstone Torch

Iron Ingot Stick Iron Ingot Grid layout Arrow (small).png Activator Rail6
Iron Ingot Redstone Torch Iron Ingot
Iron Ingot Stick Iron Ingot

Redstone Comparator

Stone +
Redstone Torch +
Nether Quartz


Redstone Torch
Grid layout Arrow (small).png Redstone Comparator
Redstone Torch Nether Quartz Redstone Torch
Stone Stone Stone

Redstone Repeater

Stone +
Redstone Torch +
Redstone




Grid layout Arrow (small).png Redstone Repeater
Redstone Torch Redstone Redstone Torch
Stone Stone Stone

Redstone component[edit]

See also: Redstone circuit

Redstone torches can be used to power blocks and transmission components such as redstone dust, activate mechanism components such as pistons, or invert redstone signals like a NOT Gate.

Placement
Examples of redstone torch placement and behavior.
To place a redstone torch, use the "Use Item/Place Block" control (right-click, by default) while aiming at the surface to which it should be attached.
A redstone torch can be attached to:
Redstone torches cannot be attached to the bottoms of any blocks.
Attempting to attach a redstone torch to an invalid surface can cause it to "snap" to a valid surface adjacent to the same space. For example, if a fence is on the ground, attempting to attach a redstone torch to the side of the fence will cause the redstone torch to be attached to the top of the ground next to the fence instead.
See also: Torch placement
Activation
A redstone torch is active unless the block it is attached to is powered. Effectively, a redstone torch inverts the signal applied to its attachment block: power level 0 is changed to 15 and power levels 1 to 15 are changed to 0 (for an alternative that produces a greater range of output power levels, consider a redstone comparator in subtraction mode).
Walls, fences, glass, slabs, and stairs cannot be powered so redstone torches attached to them cannot be deactivated. Hoppers can be activated but cannot be powered (in the sense that they would power redstone dust next to them), so redstone torches attached to hoppers also cannot be deactivated.
A redstone torch takes 1 redstone tick (2 game ticks, or 0.1 seconds barring lag) to change state and won't change state unless the signal change to its attachment block is at least 1.5 redstone ticks long (unless the change is caused by the redstone torch itself in a "short-circuit"). For example, a redstone torch won't turn off if its attachment block receives a 1-tick or shorter pulse.
Behavior
While active, a redstone torch:
A redstone torch never affects the block it is attached to, even if it is a mechanism component. For example, a redstone torch attached to a redstone lamp will not activate the lamp.
A redstone torch will "burn-out" when it is forced to change state (by powering and de-powering the block it's attached to) more than eight times in 60 game ticks (three seconds, barring lag). After burning-out, a redstone torch will produce a "smoke" particle and a hiss similar to an extinguished fire, deactivate, and will then ignore attempts to change its state until the number of state changes in the last 60 game ticks drops to fewer than eight — after that it will re-activate when it receives a block update (an adjacent block changing its state or a redstone update which wouldn't normally deactivate the redstone torch) or a block tick (block ticks occur randomly, but on average affect a particular block once every 47 seconds). There is no limit on how often a single redstone torch can burn out.
Removal
To remove a redstone torch, use the "Attack/Destroy" control (left-click, by default). Removing a redstone torch takes no time and it will drop itself as an item.
A redstone torch will also be removed and drop itself as an item:
  • if its attachment block is moved, removed, or destroyed
  • if water flows into its space
  • if a piston tries to push it or moves a block into its space
If lava flows into a redstone torch's space, the redstone torch will be destroyed without dropping itself as an item.

Data values[edit]

A redstone torch's block data stores its placement:

Bits Values
0x1
0x2
0x4

Three bits storing a value from 1 to 5:

  • 1: Redstone torch on block side facing east
  • 2: Redstone torch on block side facing west
  • 3: Redstone torch on block side facing south
  • 4: Redstone torch on block side facing north
  • 5: Redstone torch on block top
0x8 Unused.

A redstone torch's activation status is stored by changing the block id.

History[edit]

Alpha
1.0.1 Added redstone torches.
1.1.0 Redstone torches can no longer be placed on tree leaves, but only in fancy mode.
1.0.2_01 Redstone torch, NOT gates, only signal into blocks above them or next to them.
1.2.0_02 Redstone torches no longer duplicate in SMP.
Beta
1.2_01 Fixed redstone torches acting really weird when placed.
1.6.6 It is now possible to place redstone torches on glowstone.
1.7.3 Corrected a redstone torch duplication bug when using pistons.
Official release
1.2 'Burnout' time reduced from 100 ticks to 60 ticks.
1.3.1 Redstone torches can now be placed on upside-down slabs and stairs.
1.4.2 Redstone torches are destroyed when an anvil falls on them.
1.5 13w01a Redstone torches are used to craft redstone comparators and activator rails.
1.8 14w07a Redstone torches attached to the wall are now simply rotated versions of upright redstone torches, rather than having their own block model.
Console Edition
TU1 Added redstone torches.

Issues[edit]

Issues relating to "Redstone Torch" are maintained on the issue tracker. Report issues there.