Do Deutsch DT and DTM connectors mate with each other?

No. DT, DTM, and DTP use the same general sealed-connector concept, but they are different physical series with different contact sizes. DTM does not physically mate with DT or DTP.

When should I choose DTM instead of DT?

Use DTM for sensors, CAN, low-current controls, and signal circuits where DT takes too much space. DTM is the compact size-20 member of the Deutsch sealed family. Step up to DT for size-16 mid-current work.

When is 12-way DTM appropriate versus 12-way DT?

Both series offer 12-position housings. Use 12-way DTM, such as DTM04-12PA with DTM06-12SA, when the 12 circuits are signal-level and packaging space is the limit. Use 12-way DT, such as DT04-12PA with DT06-12S, when the circuits need size-16 mid-current headroom up to 13 A. On 8- and 12-way housings in both series, A through D keying is built into the housing body.

How much current can Deutsch DT and DTM carry?

DTM contacts are commonly treated as up to 7.5 A. A DT size-16 contact can carry up to 13 A with the right contact and wire; 18 AWG derates to 10 A and 20 AWG to 7.5 A. Safe current still depends on the exact contact, wire gauge, insulation, temperature, and how the harness is bundled.

What wire sizes do Deutsch DT and DTM support?

DTM covers 18-24 AWG by contact. DT can cover roughly 20-14 AWG with the right size-16 contact. The exact range depends on the contact style and the rear seal; match both current rating and insulation OD, not just AWG.

Harness choice

Deutsch DT vs DTM for a sealed harness

Same sealed Deutsch architecture. Different contact sizes. Pick DTM for compact signal circuits, DT for size-16 mid-current work.

Configure a harness

Contact: DTM size 20, DT size 16
Current: 7.5 A vs 13 A
Wire: 18-24 AWG vs 20-14 AWG
Positions: Both 2 to 12 cavities

Pick by current, wire, and package, not by family look

DT and DTM share the same field-serviceable sealed stack: matched receptacle and plug, crimped contacts, rear wire seals, cavity plugs for unused positions, and a secondary wedgelock. They still do not intermate. Current and wire set the series before cavity count does.

Envelope and use

DTM: Compact sealed signal connector for sensors, CAN, low-current controls, encoder leads, switch loops, and tight equipment cavities.
DT: Practical sealed connector for mid-current harness work: injectors, coils, relays, lamps, vehicles, agricultural equipment, and construction equipment.

Contact size

DTM: Size 20
DT: Size 16

Current

DTM: Up to 7.5 A with the right contact. The smaller shell is for signal density, not extra ampacity.
DT: Up to 13 A with the right contact and wire. Derate 18 AWG to 10 A and 20 AWG to 7.5 A. The shell does not make a small wire safe for 13 A.

Wire range

DTM: 18-24 AWG by contact. Match the rear seal to insulation OD.
DT: 20-14 AWG with the right size-16 contact. Match current rating and insulation OD, not just AWG.

Positions

DTM: 2, 3, 4, 6, 8, 12
DT: 2, 3, 4, 6, 8, 12

Housing pair

DTM: DTM04 receptacle takes pin contacts. DTM06 plug takes socket contacts. WM-series wedgelocks are required.
DT: DT04 receptacle takes pin contacts. DT06 plug takes socket contacts. Matching wedgelocks complete the stack.

12-way housings

DTM: DTM04-12PA receptacle with DTM06-12SA plug.
DT: DT04-12PA receptacle with DT06-12S plug.

Mating

DTM: Does not physically mate with DT or DTP.
DT: Does not intermate with DTM or DTP.

Deutsch DTM versus DT comparison by envelope, contact size, current, wire range, positions, housings, and mating
Criterion	DTM	DT
Envelope and use	Compact sealed signal connector for sensors, CAN, low-current controls, encoder leads, switch loops, and tight equipment cavities.	Practical sealed connector for mid-current harness work: injectors, coils, relays, lamps, vehicles, agricultural equipment, and construction equipment.
Contact size	Size 20	Size 16
Current	Up to 7.5 A with the right contact. The smaller shell is for signal density, not extra ampacity.	Up to 13 A with the right contact and wire. Derate 18 AWG to 10 A and 20 AWG to 7.5 A. The shell does not make a small wire safe for 13 A.
Wire range	18-24 AWG by contact. Match the rear seal to insulation OD.	20-14 AWG with the right size-16 contact. Match current rating and insulation OD, not just AWG.
Positions	2, 3, 4, 6, 8, 12	2, 3, 4, 6, 8, 12
Housing pair	DTM04 receptacle takes pin contacts. DTM06 plug takes socket contacts. WM-series wedgelocks are required.	DT04 receptacle takes pin contacts. DT06 plug takes socket contacts. Matching wedgelocks complete the stack.
12-way housings	DTM04-12PA receptacle with DTM06-12SA plug.	DT04-12PA receptacle with DT06-12S plug.
Mating	Does not physically mate with DT or DTP.	Does not intermate with DTM or DTP.

Above 13 A, or for pumps, fans, and motors, step up to DTP. DTP is a separate size-12 series and does not mate with DT or DTM.

12-cavity builds

When 12-way DTM or 12-way DT is the right housing

Cavity count is not a series decision. Both families stock 12 positions. Choose the contact system first, then take the 12-way housing in that series. On 8- and 12-way DT and DTM, A through D keying is built into the housing body.

Use 12-way DTM

DTM04-12PA with DTM06-12SA

The 12 circuits are sensors, CAN, low-current controls, encoder leads, or switch loops.
Packaging space is the limiting constraint and a DT shell would waste volume.
Current stays inside the size-20 envelope, commonly treated as up to 7.5 A.
Selected contacts cover 18-24 AWG.

Use 12-way DT

DT04-12PA with DT06-12S

The 12 circuits are mid-current work: injectors, coils, relays, lamps, or sealed control breakpoints.
The harness needs size-16 current headroom up to 13 A.
Wire is in the 20-14 AWG size-16 range, including 18 AWG at 10 A or 20 AWG at 7.5 A.
The breakpoint lives on vehicles, agricultural equipment, or construction equipment where DT is already the service standard.

Rules that keep the BOM honest

1. Do not mix mates. DT and DTM look related and use the same service model. They still do not intermate.
2. Do not up-rate DTM because it is sealed. Size-20 DTM contacts are for low-current work. If the circuit needs DT size-16 headroom, use DT.
3. Plug unused cavities. Any empty DT or DTM cavity needs a sealing plug, otherwise the connector has an open leak path and the sealed rating no longer applies.
4. Let the contact and wire set current. Catalog maxima are not a promise for every gauge, temperature, or bundle. Match insulation OD to the rear seal.

Questions that change the connector call

Do Deutsch DT and DTM connectors mate with each other?: No. DT, DTM, and DTP use the same general sealed-connector concept, but they are different physical series with different contact sizes. DTM does not physically mate with DT or DTP.
When should I choose DTM instead of DT?: Use DTM for sensors, CAN, low-current controls, and signal circuits where DT takes too much space. DTM is the compact size-20 member of the Deutsch sealed family. Step up to DT for size-16 mid-current work.
When is 12-way DTM appropriate versus 12-way DT?: Both series offer 12-position housings. Use 12-way DTM, such as DTM04-12PA with DTM06-12SA, when the 12 circuits are signal-level and packaging space is the limit. Use 12-way DT, such as DT04-12PA with DT06-12S, when the circuits need size-16 mid-current headroom up to 13 A. On 8- and 12-way housings in both series, A through D keying is built into the housing body.
How much current can Deutsch DT and DTM carry?: DTM contacts are commonly treated as up to 7.5 A. A DT size-16 contact can carry up to 13 A with the right contact and wire; 18 AWG derates to 10 A and 20 AWG to 7.5 A. Safe current still depends on the exact contact, wire gauge, insulation, temperature, and how the harness is bundled.
What wire sizes do Deutsch DT and DTM support?: DTM covers 18-24 AWG by contact. DT can cover roughly 20-14 AWG with the right size-16 contact. The exact range depends on the contact style and the rear seal; match both current rating and insulation OD, not just AWG.

Series references

This page is the harness-choice cut. Housing stacks, pin numbering, and contact styles live on the series guides.

Deutsch DTM connector guide

Size-20 contacts, 2 to 12 cavities, DTM04/DTM06 housings, WM-series wedgelocks, and compact signal uses.

Deutsch DT connector guide

Size-16 contacts up to 13 A, 2 to 12 positions, pinouts, seals, and mid-current field harness context.