Parts · Diodes

1N5231B

Si Zener 5.1 V 500 mW DO-35 TH.5 circuits use this part. Listed as: 512-1N5231B; Zener diode, 5.1V, DO-35.

Datasheet · from onsemi.com

Substitutes same voltage

Zeners of the same voltage. The figures are read off each part's datasheet (this one's from page 2), typical where the sheet gives a typical value, otherwise the maximum. Closest first; the last column says what differs. A different part can change the sound, and a circuit may lean on one particular figure, so read the build document's notes before you swap.

This part

Part	Vz	Power	Package	Boards
1N5231B	5.1 V	0.5 W	DO-35	7

500 mW glass zener, ±5 % in the B grade.

Alternatives

Part	Vz	Power	Package	Boards	Differs
RD5.1EB2	5.1 V	0.5 W	DO-35	17	500 mW zener; the B1-B4 suffix only picks a narrower slice of the voltage spread.
1N4733	5.1 V	1.3 W	DO-41	10	DO-41 body. 1.3 W zener in DO-41, ±5 % tolerance.

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Apex JFET Phaser 2N5952 · TL022 · TL062 · TL072 MXR Phase 45 · 125B	MXR Phase 45	Phaser	Aion FX	125B	2	$12.50	62
Emerald Resonant Phaser 2N5088 · 2SK30A-GR · 4558 · JRC4558D Boss PH-1r Phaser · 125B	Boss PH-1r Phaser	Phaser	Aion FX	125B	4	$12.50	96
Zenith Vintage Phaser 2N3906 · 2N5952 · TL022 · TL062 MXR Phase 90 · 125B	MXR Phase 90	Phaser	Aion FX	125B	4	$12.50	68
Ibanez PT-90 1458 · 2SC536SP · 2SK30AY · 2SK44SP Ibanez PT-90	Ibanez PT-90	Phaser	Experimentalists Anonymous	—	3	—	102
Ibanez PT909 1458 · 2SC536SP · 2SK30AY · 2SK44SP Ibanez PT909	Ibanez PT909	Phaser	Experimentalists Anonymous	—	3	—	100