Disc Capacitor Temperature Coefficient Codes

Walsin’s disc capacitor export has no temperature coefficient column at all — T.C. is declared and empty on all 929 rows. The only place a temperature characteristic survives is the two-letter dielectric code baked into the part number: SL for Class I, and YP, YU, YV, ZU or ZV for Class II. Decode that code with the EIA RS-198 scheme and the temperature range and capacitance-change limit come back; read the file as exported, and there is nothing there at all.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, holds the Walsin Technology (Walsin) disc capacitor parametric export, 929 rows, no duplicates. This post builds on the empty T.C. column we published in Class I vs Class II disc capacitors and adds what that column’s absence actually costs an engineer trying to select on temperature stability.

Why does Walsin’s disc capacitor file have no temperature coefficient column?

Because the column exists in name only. T.C. is one of eleven declared columns in Walsin’s disc capacitor export, and it carries zero values across all 929 rows — a fact we established and published in our Class I vs Class II post. Lead Spacing, Packing, SPQ and MOQ are empty for the same reason. A buyer filtering or sorting on temperature coefficient gets nothing back, not because no part qualifies, but because the field was never filled.

How do I read a temperature coefficient out of the dielectric code instead?

By decoding the two-letter prefix that opens every disc capacitor part number. It matches the Dielectric column exactly on all 929 rows, with zero exceptions — SL0AH150J060 is SL dielectric, YP500101K040 is Y5P, YU202102M060 is Y5U, and so on. That two-letter code is the only place a temperature characteristic lives in this file:

Prefix in part number	Dielectric field	Class	Parts
SL	SL / Class I SL	Class I	308
YP	YP(Y5P) / Class II YP(Y5P)	Class II	258
YU	YU(Y5U) / Class II YU(Y5U)	Class II	143
YV	YV(Y5V) / Class II YV(Y5V)	Class II	79
ZU	Class II ZU (Z5U)	Class II	66
ZV	Class II ZV(Z5V)	Class II	28
LR / LN	Y5R	unlabelled	47

What do Y5P, Y5U, Y5V, Z5U and Z5V actually mean?

Each is an EIA RS-198 temperature characteristic code: the first letter sets the low temperature limit, the digit sets the high temperature limit, and the last letter sets the maximum capacitance change across that range. Reading it that way turns five arbitrary-looking codes into five concrete specifications:

Code	Low temp limit	High temp limit	Max capacitance change	Parts in Walsin’s data
Y5P	−30°C	+85°C	±10%	258
Y5U	−30°C	+85°C	+22% / −56%	143
Y5V	−30°C	+85°C	+22% / −82%	79
Z5U	+10°C	+85°C	+22% / −56%	66
Z5V	+10°C	+85°C	+22% / −82%	28

Four real parts at the same value and voltage, read against this table:

Part number	Dielectric code	Temp range (EIA decode)	Max ΔC (EIA decode)	Match / mismatch
YP202102K080	Y5P	−30°C to +85°C	±10%	Reference part
YV202102M070	Y5V	−30°C to +85°C	+22% / −82%	Mismatch — same temp range, 8x looser capacitance window
ZU202102M060	Z5U	+10°C to +85°C	+22% / −56%	Mismatch — narrower temp range, wider capacitance window
YU202102M060	Y5U	−30°C to +85°C	+22% / −56%	Mismatch — same temp range as YP, tighter range than YV

All four are 1000 pF at 2000Vdc. Nothing in Walsin’s own export states the temperature range or capacitance-change figure for any of them — the dielectric code is the only carrier of that information, and it only resolves if you already know the EIA scheme to decode it with.

Does Class I SL carry any temperature-coefficient grade at all?

No finer grade than “temperature compensating.” Standard Class I ceramics are usually sold in a ladder of exact coefficients — NP0 at 0 ppm/°C, then negative-coefficient grades such as N150, N330, N750 or N1500, each a defined ppm/°C figure. Walsin’s disc export carries none of that. All 308 SL-coded parts, from 10 pF to 820 pF across seven voltage ratings, carry the identical dielectric text — SL or Class I SL — with no numeric suffix anywhere in the file.

Unique to Venatech’s data. Every one of the 308 Class I SL rows in Walsin’s 929-part disc extract carries exactly the same dielectric text regardless of capacitance or voltage. There is no NP0-style 0 ppm/°C marker, no N750 or N1500-style negative-coefficient code, and no numeric ppm/°C figure anywhere in the file for Class I. The data can tell you a part is temperature-compensating; it cannot tell you by how much, or in which direction, its capacitance moves with temperature.

What does Y5R decode to, and why does it carry no class label?

Y5R decodes as −30°C to +85°C with a ±15% maximum capacitance change — a real, fairly tight EIA Class II code, between Y5P’s ±10% and Y5U’s +22%/−56%. Despite that, Y5R is the only dielectric in Walsin’s 929-row file with zero class designation anywhere: not “Class I,” not “Class II,” not even the bare class-free form other Class II codes carry on the 367 safety-certificated rows.

Code	EIA max ΔC	Class label present in the data?
Y5P	±10%	Yes, on 155 of 258 rows
Y5U	+22% / −56%	Yes, on 52 of 143 rows
Y5R	±15%	No — 0 of 47 rows

This narrows, without fully resolving, the open question we flagged in Class I vs Class II disc capacitors: Y5R’s own EIA code identifies it as Class II by letter structure, which is consistent with a dielectric that behaves like a tighter Y5U. Walsin’s export still never says so.

Does the temperature range ever change across Walsin’s disc range?

No. Every one of the 574 Class II dielectric-coded rows carries the digit 5 as the middle character of its code — Y5P, Y5U, Y5V, Z5U, Z5V — meaning every single Class II part in this 929-row file shares the same +85°C upper temperature limit. There is no 2, 4, 6 or 7 variant anywhere, so a higher-temperature Class II option (the disc counterpart of an X7R or Z7U) does not exist in this catalogue at all. Combined with Class I’s single undifferentiated SL code, the practical result is two temperature ranges in the whole file: −30°C to +85°C, or +10°C to +85°C on the Z-coded parts. Nothing in the extract goes higher.

Do you hold a Walsin disc capacitor datasheet?

No. Venatech holds no datasheet and no public datasheet URL for Walsin’s disc capacitor line. The EIA decode above is a published industry standard, applied to Walsin’s own dielectric codes, not a figure taken from Walsin’s documentation. Confirm temperature coefficient, dissipation factor and insulation resistance against Walsin directly before a design is finalised.

For the related disc capacitor posts, see Class I vs Class II disc capacitors and Disc capacitor safety classes: AH, AC and AS. The full range is on the Walsin disc capacitor page.

The short version

Walsin’s disc capacitor export has no temperature coefficient column — T.C. is empty on all 929 rows. The dielectric code in the part number is the only surviving signal: SL for undifferentiated Class I, and YP/YU/YV/ZU/ZV for Class II, each of which decodes to an exact EIA temperature range and capacitance-change window once you apply the published standard. Y5R decodes as a real, fairly tight Class II code and still carries no class label anywhere in the file.

Send the temperature range and capacitance-stability requirement, and Venatech Limited, an authorised Walsin distributor in Hong Kong, will return the dielectric codes that actually satisfy it — decoded, not just listed.

Already holding a part number? Paste it into the cross-reference tool — it reads the manufacturer from the number itself, returns the Walsin safety capacitor candidates and states every field that differs rather than calling anything an alternative. Then check Hong Kong ready stock to see what is on the shelf today.

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Frequently asked questions

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