Diodes Incorporated BC847BLD-7

Overview

BC847BLD-7 from Diodes Incorporated is a surface-mount NPN small-signal transistor with controlled base-emitter voltage (V_BE(ON) = 647–667 mV @ I_C = 2 mA), 45 V V_CEO, 200 mA I_C, and h_FE = 150–220 (I_C = 10 mA). It is AEC-Q101 qualified and used in automotive sensor signal conditioning, LED driver biasing, and low-power switching in engine control units.

For engineers reviewing the BC847BLD-7 datasheet, BC847BLD-7 pinout, BC847BLD-7 application, or BC847BLD-7 equivalent, this page delivers verified electrical parameters, SOT-23 terminal mapping, thermal derating behavior, and direct-fit alternatives for high-reliability discrete design.

Technical Context

This NPN transistor features tightly controlled V_BE(ON) (±10 mV typical deviation) enabling precise current mirroring and stable biasing in multi-transistor analog circuits. Its f_T = 100 MHz and h_fe ≥ 150 at I_C = 10 mA support medium-frequency amplification up to ~10 MHz in active filter stages.

Rated for −55°C to +150°C junction operation and qualified per AEC-Q101, it sustains reliable gain and leakage performance under automotive thermal cycling. R_θJA = 417°C/W on FR-4 ensures predictable power dissipation up to 300 mW at 25°C ambient.

Key Specifications

Pinout & Package

Package: SOT-23 - surface-mount plastic case (UL 94V-0), 0.008 g weight, moisture sensitivity level 1, matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Compared with BC847BLD-7, BC847BW-7-F offers wider h_FE but lacks V_BE control, while MMBT3904LT1G trades AEC-Q101 compliance and tighter V_BE for broader gain range and lower cost in non-automotive use.

Availability

BC847BLD-7 is available at Aetrix Electronics and suitable for automotive ECU modules, industrial sensor signal chains, and LED bias networks requiring stable component supply and long-term lifecycle continuity.

Supply support for BC847BLD-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.

The BC847BLD-7 belongs to Diodes' AEC-Q101-qualified small-signal transistor family, engineered specifically for automotive signal conditioning and power control where V_BE consistency and thermal robustness are critical.

FAQ

Is BC847BLD-7 pin-compatible with BC847B?

Yes - both use identical SOT-23 package and pinout (E-B-C). The "LD" suffix denotes tighter V_BE(ON) control and AEC-Q101 qualification, but mechanical and electrical pin assignments match BC847B exactly.

What is the maximum continuous power dissipation at 85°C ambient?

At T_A = 85°C, derated power is 300 mW − (85 − 25) × 2.4 mW/°C = 156 mW. This assumes standard FR-4 PCB layout per AP02001; actual value depends on copper area and airflow.

Does BC847BLD-7 support pulsed operation beyond 200 mA?

Peak collector current I_CM is rated at 200 mA - no higher pulse rating is specified. Exceeding this risks bond wire failure or localized thermal runaway, even with short duty cycles.

Can BC847BLD-7 replace BC846BL in existing designs?

Only if V_CEO = 45 V suffices - BC846BL has V_CEO = 65 V. All other specs (h_FE, V_BE, package) align closely, but verify circuit margin under worst-case V_CE stress before substitution.