Build with BL3085 — Datasheet Specs & AI Design Help

00 — Overview

What the BL3085 does

The BL3085 is a half-duplex RS-485 transceiver featuring a driver and receiver with built-in fail-safe protection. It operates on +3.3V or +5V supplies, supporting data rates up to 500kbps at 5V or 250kbps at 3.3V. The device allows up to 256 transceivers on the bus and includes ±15kV ESD protection on I/O pins. Available in an SOP8 package, it is designed for smart meters, data acquisition terminals, industrial control systems, and security monitoring applications. The chip utilizes a slew-rate controlled driver to minimize EMI and signal reflections.

Next step

Start building with BL3085 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.

01 — Key specifications

Datasheet parameters

Datasheet parameters for BL3085
Parameter	Min	Typ	Max	Conditions	Source
quiescent current	—	350 µA	600 µA	No load, /RE = DI = GND or VCC; DE = VCC; 供电电流	Belling datasheet, p. 4 — 直流电气特性（5V供电）
supply voltage range	3 V	—	5.5 V		Belling datasheet, p. 4 — 直流电气特性（5V供电）
operating temperature	-40 °C	—	85 °C	specified operating temperature	Belling datasheet, p. 3 — 温度范围
propagation delay	—	280 ns	—	driver input-to-output tDPLH/tDPHL typical, VCC = +3.3V	Belling datasheet, p. 7 — 传输特性（3.3V供电）
data rate	—	250 bps	—	3.3V supply, FMAX	Belling datasheet, p. 7 — 传输特性（3.3V供电）
channel count	—	1	—		Belling datasheet, p. 1
driver count	—	1	—		Belling datasheet, p. 1
receiver count	—	1	—		Belling datasheet, p. 1

02 — Alternatives

Closest matches to BL3085

GM75176E 15.0× lower propagation delay, 1.4× higher quiescent current, 1.2× higher supply voltage range

GM3085E 2.5× lower quiescent current, 2.4× lower propagation delay, similar operating temperature

ISO1050 5.1× higher quiescent current, 3.3× lower propagation delay, 1.1× higher operating temperature

ISO1050DUBR 5.1× higher quiescent current, 4.1× lower propagation delay, 1.1× higher operating temperature

SN65HVD230 8.6× lower propagation delay, 2.8× higher operating temperature, 1.3× lower supply voltage range

TLE6250C 2.4× higher operating temperature, 2.0× lower propagation delay, 1.4× lower supply voltage range

MCP2551 5.7× lower supply voltage range, 2.3× lower propagation delay, 1.9× higher operating temperature

TJA1042BT 14.3× higher quiescent current, 2.4× higher operating temperature, 2.1× lower propagation delay

03 — FAQ

Frequently asked questions

What is the channel count of the BL3085?

The channel count is 1.

What is the data rate at 3.3V supply and FMAX?

The data rate is 250 bps.

What is the driver count for the BL3085?

The driver count is 1.

What is the specified operating temperature for the BL3085?

The specified operating temperature is 85 °C.

What is the typical propagation delay (tDPLH/tDPHL) from driver input to output?

The typical propagation delay is 280 ns at VCC = +3.3V.

What is the quiescent current of the BL3085 under the condition of No load, /RE = DI = GND or VCC; DE = VCC; 供电电流?

The quiescent current is 350 µA.

What is the receiver count for the BL3085?

The receiver count is 1.

What is the supply voltage range for the BL3085?

The supply voltage range is 5.5 V.