CG 12.00

The CG 12.00 is a series of type I ceramic disc capacitors with radial leads, rated 500 V, made to STAS 9521-74 for radio-frequency circuits of general or professional use [1]. The Agenda radioelectronistului (2nd edition, 1989) gives it in four groups by temperature coefficient – CGA, CGH, CGP and CGU – with 18 rows, 0.82–270 pF [1].

The Agenda does not say which works made the series: for the whole section on capacitors made in Romania it lists IPEE Electroargeș of Curtea de Argeș, Tehnoton of Iași, IIS Electronica of Bucharest and IPRS Băneasa as producers, and the 1st edition (1983) names only the first three [3][4]. It is listed here as made by IPRS Băneasa; Un secol de electronică în România says that the ceramic capacitor line of IPRS passed to IPEE Curtea de Argeș in 1973 [5].

Coded as [3]:

Part	Meaning
CGA	construction type: defined temperature coefficient, (+100 ± 100)·10⁻⁶/°C
CGH	the same, (−33 … 60)·10⁻⁶/°C
CGP	the same, (−150 … 100)·10⁻⁶/°C
CGU	the same, (−750 … 250)·10⁻⁶/°C
12	technological family („familia tehnologică”)
06…19	package code („codul capsulei”)

Marked in clear, the code is followed by the nominal capacitance and the tolerance; the book’s example is „CGA 12.06 — 4,7 ± 0,5” (4.7 pF, tolerance 0.5 pF or %) [3]. Discs up to 8 mm in diameter are marked in clear, larger ones in colour code [1].

In colour code, fig. 20.50 (type I ceramic) shows five marks, a to e, and fig. 20.51 (type II) three marks, a, b and c, the last labelled „Dielectric sau toleranța” (dielectric or tolerance); the book’s colour table [3]:

Colour	a: temperature coefficient (10⁻⁶/°C)	b, c: digits	d: multiplier	e: tolerance, C > 10 pF	e: tolerance, C ≤ 10 pF
black	0	0	1	±20 %	–
brown	−33	1	10	±1 %	–
red	−75	2	10²	±2 %	±0.25 pF
orange	−150	3	10³	±3 %	–
yellow	−220	4	10⁴	–	–
green	−330	5	–	±5 %	±0.5 pF
blue	−470	6	–	–	–
violet	−750	7	–	–	–
grey	–	8	10⁻²	–	–
white	–	9	10⁻¹	±10 %	±1 pF
gold	+100	–	–	–	–

The 1st edition (1983) gives other ranges in most rows, has a third CGA code (CGA 12.11) and no CGH 12.19, and gives the lead spacing as 5 and 7.5 mm (2nd edition: 5.1 and 7.6) [2][1]. Both editions print CGU 12.06 twice (2nd edition: 2.7–10 pF and 12–18 pF; 1st edition: 2.7…15 pF both times) and the tolerance list „±0,25 pF; ±0,5 pF; ±1 pF; ±5 pF (pentru Cn < 15 pF)”; the 2nd edition gives CGH 12.08 with Ø 6 mm (1st edition: 8 mm) [1][2].

The rated voltage is printed „500 V”, without „cc”; the dielectric strength is 1250 V DC („Vcc”). Dimensions in mm (fig. 20.52): diameter Ø and lead spacing d from the table; thickness max. 3; the coating may run 3 mm down the leads; leads Ø 0.6, at least 30 mm long [1].