TC1N957B Datasheet, PDF (2/3 Pages) Tak Cheong Electronics (Holdings) Co.,Ltd – 500 mW DO-35 Hermetically Sealed Glass Zener Voltage Regulators

®
TAK CHEONG
SEMICONDUCTOR
Electrical Characteristics
Device Type
VZ @ IZT
(Volts)
Nominal
TA = 25°C unless otherwise noted
IZT
(mA)
ZZT @ IZT
(Ω)
Max
ZZK @ IZK = 0.25mA
(Ω)
Max
TC1N977B
47
TC1N978B
51
TC1N979B
56
2.7
105
2.5
125
2.2
150
1500
1500
2000
V_F Forward Voltage = 1.5 V Maximum @ I_F = 200 mA for all types
IR @ VR
(µA)
Max
5
5
5
VR
(Volts)
35.8
38.8
42.6
Notes:
1. TOLERANCE AND VOLTAGE DESIGNATION
The type numbers listed have zener voltage as shown and have a standard tolerance on the nominal zener voltage of ±5%. Suffix A =
±10%, Suffix C = ±2% and D = ±1%.
2. SPECIALS AVAILABLE INCLUDE
Nominal zener voltages between the voltages shown and tighter voltage, for detailed information on price, availability and delivery,
contact you nearest Tak Cheong representative.
3. ZENER VOLTAGE (V_Z) MEASUREMENT
The zener voltage (VZ) is tested under pulse condition. The measured VZ is guaranteed to be within specification with device junction
in thermal equilibrium.
4. ZENER IMPEDANCE (Z_Z) DERIVATION
Zener impedance is derived from the 60-cycle ac voltage, which results when an ac current having an RMS value equal to 10% of the
dc zener current (IZT) is superimposed to IZT .
November 2006/ B
Page 2