Specifications
| Attribute | Value |
| Supplier | STMicroelectronics |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Series | SMBJ, TRANSIL™ |
| Part Status | Active |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 70V |
| Voltage - Breakdown (Min) | 77.8V |
| Voltage - Clamping (Max) @ Ipp | 113V |
| Current - Peak Pulse(10 / 1000µs) | 5.5A |
| Power - Peak Pulse | 600W |
| Power Line Protection | No |
| Applications | General Purpose |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
Overview
Description
SMBJ70A-TR is a high-energy transient-voltage-suppressor (TVS) diode in the SMBJ package. The “70A” indicates a 70 V working/reverse-standoff rating with a unidirectional configuration; “-TR” signifies Tape & Reel packaging for automated assembly. It protects sensitive electronics from voltage spikes by remaining off during normal operation and avalanche-conducting to clamp surges when the voltage exceeds its breakdown threshold. Common applications include protecting DC power rails in power supplies, automotive, telecom, and industrial systems. To use, place the device across the protected line and ground (observe correct polarity for a unidirectional device) and design for the peak pulse current and thermal dissipation. For exact values (V_RWM/V_BR, I_PP, P_PP, clamping voltage), refer to the datasheet from the vendor.
Equivalent
SMBJ70A-TR is a 70 V unidirectional TVS diode in the SMB (DO-214AA) package with tape & reel. Equivalents from other vendors (SMBJ70A family) include:
- Onsemi SMBJ70A
- Vishay SMBJ70A
- Littelfuse SMBJ70A
- ProTek Devices SMBJ70A
Use the -TR suffix for tape-and-reel packaging. These parts are cross-reference equivalents in the SMBJ70A family.
- Onsemi SMBJ70A
- Vishay SMBJ70A
- Littelfuse SMBJ70A
- ProTek Devices SMBJ70A
Use the -TR suffix for tape-and-reel packaging. These parts are cross-reference equivalents in the SMBJ70A family.
Features
SMBJ70A-TR is a unidirectional transient-voltage-suppressor (TVS) diode in the SMB (DO-214AB) package with Tape & Reel packaging.
Key features:
- 70 V stand-off voltage (VWM) for protecting 70 V class rails
- Unidirectional TVS (A variant)
- High peak pulse power rating (typical around 600 W, 8/20 μs)
- Very fast response time (picoseconds to nanoseconds)
- Low leakage in normal operation
- Clamping voltage at high surge currents (application-dependent, higher than VWM)
- Suitable for protecting power lines and high-speed data lines
- RoHS compliant and ready for automated PCB assembly (TR packaging)
Note: exact values (VBR, VCL, Ippm, capacitance) vary by lot; consult the datasheet for precise electrical characteristics.
Key features:
- 70 V stand-off voltage (VWM) for protecting 70 V class rails
- Unidirectional TVS (A variant)
- High peak pulse power rating (typical around 600 W, 8/20 μs)
- Very fast response time (picoseconds to nanoseconds)
- Low leakage in normal operation
- Clamping voltage at high surge currents (application-dependent, higher than VWM)
- Suitable for protecting power lines and high-speed data lines
- RoHS compliant and ready for automated PCB assembly (TR packaging)
Note: exact values (VBR, VCL, Ippm, capacitance) vary by lot; consult the datasheet for precise electrical characteristics.
Pinout
- Pin count: 2 terminals (two-terminal device).
- Function: Unidirectional transient voltage suppressor (TVS) diode in SMB package used to clamp overvoltage/transient spikes and protect downstream circuitry. The “TR” suffix denotes Tape & Reel packaging.
- Function: Unidirectional transient voltage suppressor (TVS) diode in SMB package used to clamp overvoltage/transient spikes and protect downstream circuitry. The “TR” suffix denotes Tape & Reel packaging.
Manufacturer
- Manufacturer: Littelfuse.
- What kind of company: A global electronics components company specializing in circuit protection, including fuses, TVS diodes, ESD protectors, and related protection devices.
- What kind of company: A global electronics components company specializing in circuit protection, including fuses, TVS diodes, ESD protectors, and related protection devices.
Application
SMBJ70A-TR is a unidirectional transient voltage suppressor (TVS) diode for clamping transients on high‑voltage DC rails up to about 70 V. Common applications:
- Protection of DC power rails/buses in industrial, telecom, data-center, and consumer electronics
- Automotive and 48 V–class systems (supply lines, DC links)
- Protection for DC/DC converters, motor controllers, inverters, and battery-management systems
- Surge/ESD protection for solar/energy-storage systems and other 12–60 V lines
TR denotes tape-and-reel packaging for automated SMT assembly.
- Protection of DC power rails/buses in industrial, telecom, data-center, and consumer electronics
- Automotive and 48 V–class systems (supply lines, DC links)
- Protection for DC/DC converters, motor controllers, inverters, and battery-management systems
- Surge/ESD protection for solar/energy-storage systems and other 12–60 V lines
TR denotes tape-and-reel packaging for automated SMT assembly.
Package
SMBJ70A-TR is in the SMB package (DO-214AB), a surface-mount TVS diode, shipped in tape-and-reel.
