Build with TJA1042 — Datasheet Specs & AI Design Help

00 — Overview

What the TJA1042 does

The TJA1042x family serves as a high-speed CAN transceiver bridging protocol controllers to the physical two-wire bus for automotive networks. Available in T, B, and C variants across SO8 and HVSON8 packages, it supports data rates up to 5 Mbit/s in the CAN FD fast phase. The device operates on 4.5 to 5.5 V supply voltage with a standby current of 10 to 15 μA. It handles ESD up to ±8 kV and withstands ±58 V on CAN pins. Engineers typically use these transceivers in 12 V and 24 V systems requiring low-power wake-up capabilities and robust protection against automotive transients.

Next step

Start building with TJA1042 → 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 TJA1042
Parameter	Min	Typ	Max	Conditions	Source
output voltage	2.75 V	3.5 V	4.5 V	pin CANH; RL = 50 Ω to 65 Ω; vo(dom); Bus lines; pins CANH and CANL	NXP datasheet, p. 10 — Table 7. Static characteristics...continued
output current	2 mA	5 mA	12 mA	VRXD = 0.4 V; bus dominant; iol; CAN receive data output; pin RXD	NXP datasheet, p. 10 — Table 7. Static characteristics...continued
supply voltage range	4.5 V	—	5.5 V	vcc; 3 Quick reference data	NXP datasheet, p. 2 — 3 Quick reference data
operating temperature	-40 °C	—	150 °C	virtual junction temperature Tvj	NXP datasheet, p. 2 — 3 Quick reference data
input capacitance	—	5 pF	10 pF	[6]; ci; CAN transmit data input; pin TXD	NXP datasheet, p. 10 — Table 7. Static characteristics...continued
propagation delay	60 ns	—	225 ns	td(TXDL-RXDL) delay time from TXD LOW to RXD LOW; Normal mode	NXP datasheet, p. 13 — 11 Dynamic characteristics
data rate	—	5 Mbps	—		NXP datasheet, p. 1
channel count	—	1	—		NXP datasheet, p. 1
driver count	—	1	—		NXP datasheet, p. 3
receiver count	—	1	—		NXP datasheet, p. 3

02 — Alternatives

Closest matches to TJA1042

TJA1051 5.0× lower quiescent current, 1.1× lower propagation delay, similar abs max voltage

TJA1043 9.6× higher quiescent current, 2.0× higher output current, 1.1× lower input offset voltage

ISO1050 2.8× lower quiescent current, 2.2× lower operating temperature, 1.6× higher input capacitance

ISO1050DUBR 2.8× lower quiescent current, 2.2× lower operating temperature, 1.9× lower propagation delay

SN65HVD230 13.5× lower quiescent current, 6.4× higher input capacitance, 4.1× lower propagation delay

GM3085E 5.0× lower data rate, 2.4× lower operating temperature, 1.8× lower output voltage

GM75176E 10.0× lower quiescent current, 7.1× lower propagation delay, 2.4× lower operating temperature

TLE6250C 5.0× lower data rate, 1.6× lower supply voltage range, 1.1× higher propagation delay

03 — FAQ

Frequently asked questions

What is the channel count of the TJA1042BT?

The channel count is 1.

What is the data rate of the TJA1042BT?

The data rate is 5 Mbps.

What is the driver count for the TJA1042BT?

The driver count is 1.

What is the input capacitance of the CAN transmit data input pin (TXD)?

The input capacitance is 5 pF.

What is the maximum operating temperature for the TJA1042BT?

The maximum operating temperature is 150 °C, defined as the virtual junction temperature Tvj.

What is the output current (iol) on the RXD pin when the bus is dominant and VRXD is 0.4 V?

The output current is 5 mA.

What is the output voltage at pin CANH with RL = 50 Ω to 65 Ω and vo(dom) on Bus lines pins CANH and CANL?

The output voltage is 3.5 V.

What is the propagation delay for the TJA1042BT in normal mode?

The td(TXDL-RXDL) delay time from TXD LOW to RXD LOW is 225 ns.

What is the receiver count for the TJA1042BT?

The receiver count is 1.

What is the supply voltage range for the TJA1042BT at Vcc?

The supply voltage range is 5.5 V.