My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ70CA
- Part No.:
- SMBJ70CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CA.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ70CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in power rails and signal lines. It features a 70V working stand-off voltage, 125V maximum clamping voltage at 5.0A peak pulse current, 600W peak pulse power rating, and DO-214AA (SMB) package. It is used in automotive lighting control modules to protect CAN transceivers from ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ70CA datasheet, SMBJ70CA pinout, SMBJ70CA application, or SMBJ70CA equivalent, key selection criteria include bidirectional clamping capability, 125V VC@IPP under 10/1000µs waveform, compliance with ISO 7637-2, moisture sensitivity level 1, and RoHS/halogen-free qualification - all critical for industrial and automotive board-level surge immunity design.
Technical Context
The SMBJ70CA is a silicon avalanche diode configured as a single-die, bidirectional TVS device with glass-passivated junction. Its clamping action begins at breakdown voltage (VBR min = 77.8V, max = 95.1V @ 1mA), limiting transient voltages across protected circuits within nanoseconds.
It operates over –55°C to +150°C junction temperature range, supports 10/1000µs surge waveforms up to 600W, and exhibits <1μA blocking leakage at 70V (VWM). Thermal resistance is RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable power dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 77.8 / 95.1 V @ 1 mA - Ensures reliable turn-on margin above VWM for robust surge response |
| VC @ IPP | 125 V @ 5.0 A (10/1000µs) - Limits transient voltage seen by downstream ICs to safe levels |
| PPK | 600 W - Withstands high-energy surges per ISO 7637-2 without failure |
| ID @ VWM | <1 µA - Negligible leakage current preserves system power integrity in standby |
| Package | DO-214AA (SMB) - Industry-standard surface-mount footprint compatible with automated assembly |
| Polarity | Bidirectional (CA suffix) - Protects AC-coupled or differential signal paths without orientation dependency |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, polarity indicated by cathode band (not applicable for bidirectional SMBJ70CA; terminals are symmetrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - enables placement without orientation check during SMT |
| Case | Non-electrical mechanical interface | No internal connection; serves only as thermal and mechanical anchor per JEDEC DO-214AA standard |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and improved reliability in humid environments |
| Fast response time <1.0 ps | Clamps ESD events before sensitive logic or analog circuitry sustains damage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive load-dump and inductive-switching immunity requirements |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and risk |
| RoHS and halogen-free | Complies with IEC 61249-2-21 and global environmental directives for end-product certification |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp control units exposed to battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed across VBAT–GND rail to clamp transients before they reach power management ICs. Use Value: Prevents latch-up or permanent damage to 5V/3.3V logic during 12V/24V system surges up to 600W peak power. | Use Scenario: Shielding digital input channels of programmable logic controllers from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: TVS connected between isolated input terminal and ground to shunt fast transients from relay coils or motor drives. Use Value: Maintains signal integrity and prevents false triggering during repetitive 10/1000µs surges per IEC 61000-4-5 Level 3. |
| USB-C Power Delivery Interface | Smart Meter Communication Port |
Use Scenario: Safeguarding USB-C CC and VCONN lines against ESD and hot-swap transients in portable power adapters. IC Role / Device Role / Timing Role: Bidirectional TVS placed on differential CC line pair to preserve USB PD protocol timing while suppressing ±15kV contact ESD. Use Value: Enables compliance with IEC 61000-4-2 Level 4 without degrading high-speed signaling integrity. | Use Scenario: Protecting RS-485 transceivers in utility smart meters connected to long outdoor communication cables. IC Role / Device Role / Timing Role: TVS installed across A/B bus lines and ground to absorb lightning-induced surges entering via meter's external port. Use Value: Limits clamped voltage to ≤125V, keeping transceiver stress below absolute maximum ratings during 1kV/10/1000µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ70CA | Same DO-214AC (SMA) package; 125V VC@IPP, but lower PPK = 400W; higher RθJA = 65°C/W | Lower surge energy handling limits use to less severe environments (e.g., consumer vs. automotive) | Select when footprint compatibility with SMA is required and 400W surge rating suffices |
| ON Semiconductor 1.5SMC70CA | DO-214AB (SMC) package; identical 70V VWM and 125V VC@IPP; PPK = 1500W; larger footprint | Higher power handling supports harsher transients but requires PCB area increase and layout revision | Select when system-level surge testing exceeds 600W and board space allows SMC package |
Compared with SMBJ70CA, SMAJ70CA offers smaller size but reduced surge margin, while 1.5SMC70CA delivers triple the peak power at the cost of larger board area - choice depends on validated surge profile and layout constraints.
Availability
SMBJ70CA is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and smart meter communication port designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ70CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMBJ series was developed specifically for high-reliability, surface-mount transient suppression in demanding environments - emphasizing low clamping voltage, ISO 7637-2 compliance, and MSL-1 process compatibility.
FAQ
What is the clamping voltage of SMBJ70CA under standard 10/1000µs surge conditions?
The SMBJ70CA has a maximum clamping voltage (VC) of 125 V when subjected to a 5.0 A peak impulse current with a 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage during surge events. The SMBJ70CA maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is SMBJ70CA unidirectional or bidirectional, and how does that affect PCB layout?
SMBJ70CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning both terminals are electrically symmetrical and function identically regardless of voltage polarity. This eliminates orientation constraints during placement - no cathode band marking applies, and the SMBJ70CA can be mounted in either direction on the PCB without functional impact.
Does SMBJ70CA meet automotive surge immunity standards such as ISO 7637-2?
Yes, SMBJ70CA is explicitly rated to meet ISO 7637-2 test pulses including Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 600W peak pulse power rating and sub-1ps response time ensure robust protection for automotive ECUs, lighting modules, and body control units per OEM requirements.
What is the maximum leakage current of SMBJ70CA at its working stand-off voltage?
At its 70 V working stand-off voltage (VWM), the SMBJ70CA exhibits a maximum blocking leakage current (ID) of 1 µA at 25°C. This ultra-low leakage preserves power rail integrity in always-on systems and avoids unintended current paths in high-impedance sensing or battery-backed circuits where the SMBJ70CA is deployed.
What packaging and moisture sensitivity level does SMBJ70CA have, and why does it matter for manufacturing?
SMBJ70CA is supplied in DO-214AA (SMB) package on 3,000-piece tape-and-reel, with moisture sensitivity level (MSL) 1 per J-STD-020. MSL-1 means the SMBJ70CA can be stored indefinitely at ambient conditions and placed directly into reflow without baking - simplifying SMT line logistics and eliminating yield loss from moisture-related popcorning during soldering.
SMBJ70CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ70CA FAQ
1.How can I place an order for SMBJ70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ70CA reliable?
The price and inventory of SMBJ70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CA is usually 5 days.
3.What payment methods are accepted for SMBJ70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CA?
SMBJ70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ70CA?
For technical support, including SMBJ70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CA requirements.
6.How does Aetrix verify that SMBJ70CA is sourced from the original manufacturer or authorized distributors?
All SMBJ70CA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ70CA meets industry standards.
7.What is the process for return or replacement of SMBJ70CA?
All SMBJ70CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ70CA part is unused and in its original packaging.
Return procedure for SMBJ70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CA Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
