Passivated, sensitive gate thyristors in a plastic envelope, intended for use in general purpose switching and phase control applications. These devices are intended to be interfaced directly to microcontrollers, logic integrated circuits and other low power gate trigger circuits.

Features and Benefits
  • Sensitive gate suitable for logic level controls
  • General purpose switching
Package version
Package name
Product status
Tj [max]
VRRM [max]
Product Parametric
Type Number Symbol Parameter Conditions Min Typ/Nom Max Unit
BT258-500R VDRM repetitive peak off-state voltage       500 V
VRRM repetitive peak reverse voltage       500 V
IT(AV) average on-state current half sine wave; Tmb ≤ 111 °C     5 A
IT(RMS) RMS on-state current half sine wave; Tmb ≤ 111 °C     8 A
ITSM non-repetitive peak on-state current half sine wave; Tj(init) = 25 °C; tp = 10 ms     75 A
half sine wave; Tj(init) = 25 °C; tp = 8.3 ms     82 A
Tj junction temperature       125 °C
IGT gate trigger current VD = 12 V; IT = 0.1 A; Tj = 25 °C   50 200 µA
IL latching current VD = 12 V; IG = 0.1 A; Tj = 25 °C   0.4 10 mA
IH holding current VD = 12 V; Tj = 25 °C   0.3 6 mA
dVD/dt rate of rise of off-state voltage VDM = 335 V; Tj = 125 °C; RGK = 100 μ; (VDM = 67% of VDRM); exponential waveform 50 100   V/µs
Type number Package Packing Product status Marking Orderable part number Ordering code (12NC)
BT258-500R SOT78
Horizontal, Rail Pack Volume production Standard Marking BT258-500R,127 9340 429 40127
Quality, reliability & chemical content
Chemical content Orderable part number Type number RoHS / RHF Leadfree conversion date MSL MSL LF
BT258-500R BT258-500R,127   BT258-500R LeadedE   NA NA
Ordering & availability
Type number Ordering code (12NC) Orderable part number Region Distributor Order sample
BT258-500R 9340 429 40127 BT258-500R,127 NA NA  
IGT [max]
IT(RMS) [max]
ITSM [max] @ 50 Hz
VDRM [max]
Cross Reference
3P1M 3P1MH 3P2M 3P2MH 3P4M 3P4MH 3P5M 3P5MH 5P05M 5P4M 5P5M C118A C118B C118C CR3CM-8 DRE3 DRE3B DRE3C DRE3E FS0802BE FS0802BF FS0802BH FS0802DE FS0802DF FS0802DH MCR72-3G MCR72-6TG MCR8SDG S0306FS21 S0308FS21 S0402BH S0402DH S0506FS21 S0508FS21 S0510FS21
Orderable part number

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