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Taiwan Semiconductor Corporation SMBJ70CAH
- Part No.:
- SMBJ70CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CAH.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,651
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Product details
Overview
SMBJ70CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 70V working stand-off voltage (VWM), and 113V maximum clamping voltage (VC) at 5.5A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ70CAH datasheet, SMBJ70CAH pinout, SMBJ70CAH application, or SMBJ70CAH equivalent, this device is selected for high-reliability bidirectional ESD and surge protection where AEC-Q101 qualification, sub-1ps response time, and <1μA leakage above 10V are critical design requirements.
Technical Context
The SMBJ70CAH implements a glass-passivated silicon junction optimized for fast transient suppression with symmetrical bidirectional breakdown behavior. Its VBR min/max of 77.8V/86.0V at 1mA IT ensures robust overvoltage threshold margin across temperature and process variation.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting continuous operation up to TJ = +150°C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - enabling direct placement in high-volume automotive PCB assembly without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70V - Maximum continuous reverse operating voltage before clamping begins; sets system-level DC rail protection threshold |
| VBR (min/max) | 77.8V / 86.0V @ 1mA - Confirmed bidirectional breakdown range ensuring reliable turn-on during transients |
| VC @ IPP | 113V @ 5.5A - Clamping voltage under 10/1000µs surge; defines worst-case voltage seen by protected IC |
| PPK | 600W - Peak pulse power rating per 10/1000µs waveform; validates compliance with ISO 7637-2 Pulse 5a |
| ID @ VWM | <1µA - Leakage current at 70V; enables low-power system standby integrity without battery drain |
| TJ max | +150°C - Maximum junction temperature; supports under-hood automotive deployment without derating |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; dual-terminal configuration with no polarity distinction for bidirectional operation - terminals are electrically symmetrical and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Bidirectional transient conduction path | Marked band indicates terminal orientation but does not define polarity; both terminals function identically in AC/DC surge paths |
| Unmarked terminal | Bidirectional transient conduction path | Electrically identical to marked terminal; no functional difference between terminals in CAH-series devices |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Fast response time <1.0ps | Enables clamping before transient energy couples into downstream logic or analog circuitry |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Guarantees immunity to load dump, inductive switching, and EFT events in 12V/24V vehicle systems |
| Glass passivated junction | Provides stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power input to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤113V during 600W transients, preventing latch-up or gate oxide damage in downstream semiconductors. | Use Scenario: Digital input modules receiving 24V sensor signals in factory automation environments with frequent relay switching. IC Role / Device Role / Timing Role: SMBJ70CAH installed at connector entry point to absorb inductive kickback from solenoid drivers. Use Value: Suppresses >1kV transients within 1ps, maintaining signal integrity and eliminating false triggering of digital inputs. |
| LED Lighting Driver Protection | Automotive CAN Transceiver Protection |
Use Scenario: Constant-current LED drivers in headlamp modules subjected to ESD and conducted RF noise. IC Role / Device Role / Timing Role: Parallel-connected TVS on output stage to shunt ESD pulses away from high-side MOSFETs and current-sense amplifiers. Use Value: With <1μA leakage at 70V, it avoids loading the regulated output while clamping ±15kV contact ESD per IEC 61000-4-2. | Use Scenario: CAN FD physical layer circuits in body control modules exposed to board-level EFT and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional protection on CAN_H/CAN_L differential pair to maintain common-mode immunity without distorting data eye. Use Value: Symmetrical clamping ensures equal voltage limiting on both lines, preserving differential signaling integrity up to 5Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ70CA | Same DO-214AC (SMA) package; 113V VC @ 5.5A but higher RθJA (65°C/W); no AEC-Q101 certification | Not qualified for automotive under-hood use; suitable for industrial/commercial PCBs with lower thermal constraints | Select when AEC-Q101 is not required and board space allows SMA footprint |
| Vishay SM8S70CAHE3_A/H | DO-214AB (SMC) package; 113V VC @ 5.5A; AEC-Q101 qualified; higher PPK (660W) | Larger footprint increases board area but improves thermal dissipation for sustained surge duty cycles | Prefer when higher surge repetition rate or extended thermal margin is needed in automotive designs |
Compared with SMAJ70CA and SM8S70CAHE3_A/H, SMBJ70CAH delivers AEC-Q101 compliance in the compact DO-214AA (SMB) footprint - balancing automotive qualification, thermal performance (RθJA = 55°C/W), and PCB area efficiency for space-constrained ECUs.
Availability
SMBJ70CAH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, LED lighting driver modules, and CAN bus interface protection requiring stable component supply and full traceability.
Supply support for SMBJ70CAH 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, and rectifiers - with global distribution and AEC-Q101-compliant production lines.
The SMBJH series was developed specifically for automotive and industrial transient suppression, emphasizing fast response, low leakage, and robust packaging to meet ISO 7637-2 and AEC-Q101 requirements.
FAQ
What is the clamping voltage of SMBJ70CAH at its rated peak pulse current?
The SMBJ70CAH has a maximum clamping voltage (VC) of 113V at 5.5A peak impulse current (IPP), measured under the standard 10/1000µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the manufacturer's electrical specifications table for SMBJ70AH variants. The SMBJ70CAH maintains this clamping performance in both directions due to its symmetrical bidirectional construction.
Is SMBJ70CAH qualified for automotive applications?
Yes, SMBJ70CAH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per the AEC-Q101 standard. It is explicitly intended for automotive use cases such as power rail protection in engine control units and body electronics, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements. The SMBJ70CAH datasheet confirms this qualification in its FEATURES section.
What does the "CAH" suffix indicate in SMBJ70CAH?
The "CAH" suffix in SMBJ70CAH denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction per IEC 61249-2-21. Unlike unidirectional "H" or "AH" variants, the "C" signifies symmetrical breakdown behavior - meaning the device clamps equally in both polarities. This makes SMBJ70CAH suitable for protecting AC-coupled or differential signal lines like CAN bus, where polarity reversal must be handled without external circuitry.
What is the maximum junction temperature rating for SMBJ70CAH?
The SMBJ70CAH has a maximum junction temperature (TJ) rating of +150°C, as specified in the Absolute Maximum Ratings table. This allows operation in high-temperature environments such as automotive under-hood applications or industrial motor drives. Derating curves in the datasheet show that the device maintains full 600W peak pulse power capability up to TA = 25°C, with linear reduction above that ambient temperature - a key parameter verified for SMBJ70CAH in the Thermal Performance section.
How does SMBJ70CAH compare to SMBJ70AH in terms of electrical performance?
SMBJ70CAH and SMBJ70AH share identical VWM (70V), VBR (77.8–86.0V), and VC (113V) specifications, but differ fundamentally in configuration: SMBJ70AH is unidirectional (cathode-marked), while SMBJ70CAH is bidirectional (no polarity). The SMBJ70CAH replaces the need for two unidirectional devices in differential protection schemes and eliminates concerns about orientation during automated placement - a distinction clearly documented in the Devices for Bipolar Applications section of the datasheet.
SMBJ70CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 5.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ70CAH FAQ
1.How can I place an order for SMBJ70CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CAH 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 SMBJ70CAH reliable?
The price and inventory of SMBJ70CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CAH is usually 5 days.
3.What payment methods are accepted for SMBJ70CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CAH?
SMBJ70CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CAH 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 SMBJ70CAH?
For technical support, including SMBJ70CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CAH requirements.
6.How does Aetrix verify that SMBJ70CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ70CAH 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 SMBJ70CAH meets industry standards.
7.What is the process for return or replacement of SMBJ70CAH?
All SMBJ70CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CAH, 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 SMBJ70CAH part is unused and in its original packaging.
Return procedure for SMBJ70CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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