# PCB relay, through-hole

A through-hole PCB relay: a closed case on the board with its pins at the maker's PCB layout. Pin 1 is at the origin. The pins are placed as the maker's bottom-view PCB layout draws them, seen from above (the layout turned over about its horizontal axis). The layout's rows run along +X, and its next row is towards +Y. The pins go down through the board. The Finder 34.51 flat pack lies on the board, its pins bent down at one long side.

## Omron

| Type | Contacts | Case (average) | Pins below the board | Pin section | PCB layout: columns from pin 1 | Rows apart | Pin 1 from the case end, side | Weight (sheet) |
|---|---|---|---|---|---|---|---|---|
| G2RL-2 | DPDT, power | 28.8 x 12.5 x 15.5 | 3.5 | 0.5 x 0.8 | 0, 15, 20, 25 | 7.5 | 2.3, 2.5 | approx. 12 g |
| G5V-1 | SPDT, signal | 12.3 x 7.3 x 9.9 | 3.5 | 0.5 x 0.3 | 0, 2.54, 10.16 | 5.08 | 1.07, 1.11 | approx. 2 g |
| G5V-2 | DPDT, signal | 20.3 x 9.9 x 11.4 | 3.5 | 0.5 x 0.3 | 0, 7.62, 12.7, 17.78 | 7.62 | 1.3, 1.2 | approx. 5 g |
| G6A | DPDT, signal | 20 x 9.9 x 8.2 | 3.16 | 0.6 x 0.3 | 0, 7.62, 12.7, 17.78 | 7.62 | 1.2, 1.2 | approx. 3.5 g |
| G6AK | DPDT, signal, double-winding latching | 20 x 9.9 x 8.2 | 3.16 | 0.6 x 0.3 | 0, 2.54, 7.62, 12.7, 17.78 | 7.62 | 1.2, 1.2 | approx. 3.5 g |

The case sizes are the data sheets' average values (their maximums are 0.2 to 0.3 larger). The distances from pin 1 to the case are the PCB layouts' bracketed reference values, and the case's far end takes what's left of its average size.

## Source

Omron data sheets, from Omron's own site (omronfs.omron.com/en_US/ecb/products/pdf/):

- *PCB Power Relay G2RL*, Cat. No. J117-E1-17 (`en-g2rl.pdf`): weight approx. 12 g (Ratings, page 2); Dimensions, page 6, G2RL-2(-HA, -PW1), G2RL-24, G2RL-2-ASI: 29 max. (28.8) x 12.7 max. (12.5) x 15.7 max. (15.5), terminals 3.5 long, 0.5 and 0.8; PCB mounting holes: eight, 20 from pin 1 to the third column, the columns 5 apart, the rows 7.5 apart, (2.3) and (2.5) to the case.
- *Low Signal Relay G5V-1*, Cat. No. K048-E1-07 (`en-g5v_1.pdf`): weight approx. 2 g; Dimensions, page 4: 12.5 max. (12.3) x 7.5 max. (7.3) x 10 max. (9.9), terminals 3.5, 0.5 and 0.3; six holes at 2.54, 7.62 (10.16 in all) and 5.08, (1.07) and (1.11) to the case.
- *Low Signal Relay G5V-2*, Cat. No. K046-E1-06 (`en-g5v_2.pdf`): weight approx. 5 g; Dimensions, page 4: 20.5 max. (20.3) x 10.1 max. (9.9) x 11.5 max. (11.4), terminals 3.5, 0.5 and 0.3; eight holes at 7.62, 5.08, 5.08 and 7.62 apart, (1.3) and (1.2) to the case.
- *Low Signal Relay G6A*, Cat. No. K020-E1-15 (`en-g6a.pdf`): weight approx. 3.5 g; Dimensions, page 8: G6A-274P and G6AU-274P, 20.2 max. (20) x 10.1 max. (9.9) x 8.4 max. (8.2), terminals 3.16 long, 0.6 and 0.3; eight holes at 7.62, 5.08, 5.08 and 7.62 apart, (1.2) to the case; G6AK-274P, ten holes, with a column 2.54 from pin 1.

The data sheets name no materials.

**Proportions, for looks and mass.** The data sheets don't dimension the inside. The case is a cover 0.5 thick over a base plate 0.5 thick. The coil, core and contacts inside are one copper block filling 0.27 of the space inside the case and standing on the base. That share is the same for every type.

Mass, with `pa6` at 1.15 and `copper` at 8.96 g/cm³:

| Type | Model | Data sheet |
|---|---|---|
| G2RL-2 | 12.4 g | approx. 12 g |
| G5V-1 | 1.85 g | approx. 2 g |
| G5V-2 | 4.94 g | approx. 5 g |
| G6A, G6AK | 3.45 g | approx. 3.5 g |

The case is black (`pa6`), and the pins are tin-plated copper.

`Relay_DPDT_Omron_G6A` and `G6AK` in the old catalogue were measured (2026-11-06): a case 20 x 9.9 x 8.2 with pins 3.16 below, pin 1 1.14 from the case's end and 1.21 from its side, against the sheet's (1.2) and (1.2). That's within 0.07, and the pins are at the same places. The catalogue's G2RL, G5V-1 and G5V-2 entries have no model. They name the part, and the sheets above give it.

## Finder

Pin 1 is coil terminal A1. The sizes are the sheets' nominal values (they give no maximums).

| Type | Contacts | Case | Pins below the board | Pin section (along x across the case) | PCB layout from A1 | Pin 1 from the case end, side |
|---|---|---|---|---|---|---|
| 30.22 | DPDT, 2 A | 20.2 x 10 x 10.9 | 3.2 | coil 0.4 x 0.4, contacts 0.6 x 0.4 | 11, 12, 14 at 7.62, 12.7, 17.78; A2 row 7.62 across | 1.12, 1.19 |
| 32.21-4000 | SPDT, 6 A | 20.2 x 10.1 x 10.7 | 3.5 | coil 0.4 x 0.4, contacts 0.8 x 0.3 | 11, 14 at 10.16, 17.78; A2 and 12 7.62 across | 1.32, 1.24 |
| 32.21-4300 | SPST-NO, 6 A | as 32.21-4000, without 12 | 3.5 | as above | as above | 1.32, 1.24 |
| 34.51 | SPDT, 6 A, 5 mm wide | 28 x 5 x 15 | 3.5 | coil 0.5 x 0.5, contacts 1 x 0.4 | one row: A2 at -3.75, 12, 11, 14 at 11.25, 16.25, 21.25 | 4.85, 3.7 |
| 34.51-flat | as 34.51, flat pack (34.51.7xxx.x019) | 28 x 15 lying, 5 high | 2.5 | as 34.51 | as 34.51, at the case's long side | 4.85, -0.4 (the case starts 0.4 past the pin row) |
| 36.11 | SPDT, 10 A (36.11-4011) | 18.8 x 15.2 x 15.5 | 3.5 | coil 0.5 x 0.5, 11 0.3 x 1.2, contacts 1 x 0.5 | A2 12 across; 11 at -2, 6 across; 14, 12 at 12.2 | 3.2, 1.6 |
| 40.31 | SPDT, 12 A, 3.5 mm pitch | 29 x 12.4 x 25.1 | 5.2 | 0.4 x 1 | 12, 14 at 16.5, 23.5; A2 7.5 across, 11 at 20 in its row | 2.5, 2.45 |
| 40.51 | SPDT, 12 A, 5 mm pitch | 29 x 12.4 x 25.1 | 5.2 | 0.4 x 1 | 12, 14 at 15, 25; 11 at 20 in A2's row | 2.5, 2.45 |
| 40.52 | DPDT, 8 A | 29 x 12.4 x 25.1 | 5.2 | 0.4 x 1 | 15, 20, 25 in both rows, 7.5 apart | 2.5, 2.45 |
| 40.61 | SPDT, 16 A | 29 x 12.4 x 25.1 | 5.2 | 0.4 x 1 | as 40.52 | 2.5, 2.45 |

`40.31-3.5`, `40.51-3.5` and `40.61-3.5` are the same relays with the 3.5 mm pins of the PCB-only versions (ordering code digit C = 2); the others have the 5.2 mm pins for PCB or sockets (40.52 comes only with those).

### Source

Finder series sheets, from Finder's own site (cdn.findernet.com/app/uploads/), with the edition printed on each page:

- *30 Series, Subminiature DIL relays 2 A*, edition II-2026 (`S30EN.pdf`): copper side view, page 3: A1, 11, 12, 14 at 7.62, 5.08 and 5.08 apart, rows 7.62 apart, 14 1.3 from the case end, case 20.2 x 10; outline drawing, page 5: 20.2 x 10 x 10.9, pins 3.2 long, 0.4 (coil) and 0.6 (contacts) wide, 0.4 thick.
- *32 Series, Subminiature PCB relays 6 A*, edition XII-2025 (`S32EN.pdf`): copper side views of 32.21-4000 and -4300, page 3: 10.16 and 7.62, rows 7.62 apart, 14 1.1 from the case end, case 20.2 x 10.1; outline drawing, page 5: 20.2 x 10.1 x 10.7, pins 3.5, 0.4 x 0.4 (coil) and 0.8 x 0.3 (contacts).
- *34 Series, Ultra-Slim PCB relays*, edition II-2026 (`S34EN.pdf`): copper side view of 34.51, page 3: 3.75, 11.25, 5 and 5, the row 1.3 from the case side, 14 1.9 from the end, case 28 x 5; flat pack version, page 6: case 28 x 15, the pin row 15.4 from the far side, the pins' ends 7.5 from the case's far face; outline drawing, page 9: 28 x 5 x 15, pins 3.5, 0.5 x 0.5 and 1 x 0.4.
- *36 Series, Miniature PCB relays 10 A*, edition II-2026 (`S36EN.pdf`): copper side view of 36.11-4011, page 3: 2, 12.2 and 3.4 along, 6 and 6 across, case 18.8 x 15.2; outline drawing, page 5: 18.8 x 15.2 x 15.5, pins 3.5, 0.3 x 1.2 (11), 0.5 (coil) and 1 (contacts) along the case.
- *40 Series, PCB/Plug-in relays 8 - 10 - 12 - 16 A*, edition VIII-2026 (`S40EN.pdf`): copper side views, page 3: 2.5 and 20, 3.5 + 3.5 (40.31) or 5 + 5 (40.51, 40.52, 40.61), rows 7.5 apart, case 29 x 12.4; pin lengths 3.5 (PCB only) and 5.2 (PCB or socket), pages 3 and 5; outline drawing, page 10: 29 x 12.4 x 25.1, pins 0.4 x 1.

The sheets name no materials and give no weight.

**Proportions.** The sheets dimension the rows and the case width but not the gap between them: the rows are centred across the case. The 36.11's coil and contact pins are taken as 0.5 thick across the case, as drawn (the sheet gives only their width along it). The small standoffs under the 32.21 (0.4) and 34.51 (0.3) cases aren't modelled: the case stands on the board. The flat pack's pins bend 1.3 above the board, the standing version's 1.3 from the case side. The inside is the Omron proportions: a 0.5 cover and base, and a copper block filling 0.27 of the inside.

Mass (no weight in the sheets to compare with): 30.22 4.75 g, 32.21 4.69 g, 34.51 4.39 g, 36.11 9.8 g, 40 series 20.2 to 20.3 g.

The 30, 32 and 36 cases are white, the 40 series' blue and the 34.51 black, as in Finder's pictures.

### The old catalogue's models

Measured 2026-11-06 against the sheets. The pin positions are the same in every model. The cases and pins differ:

| Model | Case (model / sheet) | Pin 1 from the case end (model / sheet) | Pins below (model / sheet) | Pin sections (model / sheet) |
|---|---|---|---|---|
| `Relay_DPDT_Finder_30.22` | 20.3 x 10.1 x 11.4 / 20.2 x 10 x 10.9 | 1.26 / 1.12 | 3.5 / 3.2 | all 0.7 x 0.4 / coil 0.4 x 0.4, contacts 0.6 x 0.4 |
| `Relay_SPDT_Finder_32.21-x000`, `Relay_SPST_Finder_32.21-x300` | 20 x 10 x 10.7 / 20.2 x 10.1 x 10.7 | 1.4 / 1.32 | 3.0 / 3.5 | contacts 0.6 x 0.4 / 0.8 x 0.3 |
| `Relay_SPDT_Finder_34.51_Vertical` | 28 x 5 x 15, the same | 4.85, the same | 3.5, the same | the same |
| `Relay_SPDT_Finder_34.51_Horizontal` | 28 x 15.85 (with the pins) x 5 / 28 x 15.4 x 5 | 4.85, the same | 3.0 / 2.5 | the same |
| `Relay_SPDT_Finder_36.11` | 19 x 15.2 x 15.5 / 18.8 x 15.2 x 15.5 (turned 90 degrees) | 3.4 / 3.2 | 3.5, the same | contacts 1 x 0.4 / 1 x 0.5 (thickness not given) |
| `Relay_SPDT_Finder_40.31`, `40.51`, `Relay_DPDT_Finder_40.52` | 29 x 12.4 x 25 / 29 x 12.4 x 25.1 | 3.0 / 2.5 | 5.3 / 5.2 | the same |

The catalogue's x000 and x300 stand for 32.21-4000 and -4300, the only 32.21 types in the sheet. Its `Finder_40.11` and `40.41` aren't in the 40 series sheet (edition VIII-2026), so they're left out.

## The family's other relays

Schrack, Panasonic, Fujitsu, Hongfa, Kemet, COTO, Standex-Meder, SANYOU, HJR, HsinDa and Omron G6H, G6K, G6S, G6E, G5LE and G5NB aren't here yet; see `COVERAGE.md`.