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Taiwan Semiconductor Corporation SMBJ70AH
- Part No.:
- SMBJ70AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70AH.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,587
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Product details
Overview
SMBJ70AH from Taiwan Semiconductor is a unidirectional 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 SMBJ70AH datasheet, SMBJ70AH pinout, SMBJ70AH application, or SMBJ70AH equivalent, key selection criteria include its AEC-Q101 qualification, <1.0ps response time, <1μA leakage above 10V, 150°C junction rating, and compliance with ISO 7637-2 and J-STD-020 Level 1 moisture sensitivity.
Technical Context
The SMBJ70AH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 77.8–86.0V breakdown range (VBR @ IT = 1mA). Its glass-passivated junction ensures stable clamping performance under repetitive surge stress, with thermal resistance RθJA = 55°C/W enabling reliable operation in compact PCB layouts without forced airflow.
It meets automotive-grade reliability requirements including AEC-Q101 qualification, JESD201 Class 2 whisker resistance, and UL 94V-0 mold compound - supporting robust ESD and electrical fast transient (EFT) immunity in 12V/24V vehicle subsystems and industrial control I/O interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe system rail margin for 12V/24V automotive applications. |
| VBR min/max | 77.8 / 86.0 V @ 1 mA - Confirmed breakdown threshold range ensuring predictable turn-on during transients. |
| VC @ IPP | 113 V @ 5.5 A - Clamping voltage limits downstream IC stress during 10/1000µs surge events per ISO 7637-2. |
| PPK | 600 W - Peak pulse power handling capacity for single-event surge protection without degradation. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits. |
| TJ max | +150 °C - Enables deployment in under-hood and high-temperature industrial environments. |
| RθJA | 55 °C/W - Thermal performance allows 3W steady-state dissipation at 25°C ambient with standard PCB copper area. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity-sensitive unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., battery feed); conducts forward current only during fault conditions. |
| Cathode | Ground/Return side | Connected to system ground or low-impedance return path; defines clamping reference point. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use across temperature, humidity, and mechanical shock profiles per JEDEC standards. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current under thermal cycling and humidity exposure. |
| Clamping voltage ≤113 V | Guarantees downstream ICs (e.g., CAN transceivers, microcontrollers) remain below absolute maximum ratings during 10/1000µs surges. |
| Response time <1.0 ps | Enables suppression of nanosecond-scale ESD and EFT events before sensitive circuitry responds. |
| ISO 7637-2 compliant | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) test requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V/24V supply lines in body control modules, lighting drivers, and infotainment head units from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp surges before they reach power management ICs. Use Value: Prevents latch-up or permanent damage to buck regulators and microcontrollers during ISO 7637-2 Pulse 1 (−120V/350ms) events. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Placed at connector entry point to shunt fast-rising EFT bursts (IEC 61000-4-4) away from precision ADC front-ends. Use Value: Maintains measurement accuracy by limiting transient-induced offset shift and preventing ADC saturation or reset. |
| LED Driver Surge Suppression | Automotive CAN Bus Power Line Protection |
Use Scenario: Shielding constant-current LED driver ICs in exterior lighting (headlamps, tail lamps) from alternator ripple and relay bounce. IC Role / Device Role / Timing Role: Mounted directly at driver IC VIN pin to absorb repetitive 100V/10ms pulses from inductive coil switching. Use Value: Extends LED driver lifetime by eliminating cumulative junction heating from sub-threshold surge accumulation. | Use Scenario: Protecting the VCC supply of CAN transceivers (e.g., TJA1042, SN65HVD230) in gateway ECUs from battery line disturbances. IC Role / Device Role / Timing Role: Positioned on transceiver VCC rail upstream of local decoupling to prevent supply collapse during Pulse 2a/2b events. Use Value: Ensures uninterrupted CAN communication during engine cranking and ignition switch transitions without bus error frames. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | Same VWM (70V), but higher VC = 125V @ 5.0A; no AEC-Q101 qualification; lower clamping performance. | Not suitable for automotive safety-critical systems requiring AEC-Q101; acceptable for cost-sensitive industrial controls. | Select SMBJ70A only if AEC-Q101 is not required and clamping voltage margin permits higher VC. |
| SAC70AH | Same VWM (70V), same AEC-Q101 rating, but smaller SOD-123FL package; lower PPK = 400W; VC = 113V @ 3.5A. | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 due to reduced energy handling. | Choose SAC70AH only for space-constrained designs where surge energy is limited to IEC 61000-4-5 Level 3 (1kV/0.5kA). |
Compared with SMBJ70A and SAC70AH, the SMBJ70AH uniquely combines AEC-Q101 qualification, 600W surge capability, and 113V clamping in DO-214AA - making it the only option among the three validated for full ISO 7637-2 compliance in automotive power rail protection.
Availability
SMBJ70AH is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and LED lighting applications requiring stable component supply, traceable sourcing, and lifecycle continuity support.
Supply support for SMBJ70AH 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 automotive, industrial, and consumer markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing low clamping voltage, fast response, and robust thermal performance in surface-mount packages.
FAQ
What is the breakdown voltage range for SMBJ70AH?
The SMBJ70AH has a minimum breakdown voltage (VBR) of 77.8 V and a maximum of 86.0 V, measured at 1 mA test current (IT) per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across production lots while accommodating thermal drift and manufacturing tolerances in automotive operating conditions.
Is SMBJ70AH suitable for bidirectional transient protection?
No, SMBJ70AH is a unidirectional TVS diode and must be used with correct polarity - anode to line, cathode to ground. For bidirectional protection, select SMBJ70CAH (with CAH suffix), which provides symmetrical clamping in both directions and uses the same DO-214AA package.
Does SMBJ70AH meet automotive qualification standards?
Yes, SMBJ70AH is AEC-Q101 qualified and complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b test requirements. It also meets JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 flammability standards - confirming suitability for under-hood and chassis-mounted automotive applications.
What is the maximum clamping voltage of SMBJ70AH and at what current?
The SMBJ70AH has a maximum clamping voltage (VC) of 113 V at a peak impulse current (IPP) of 5.5 A, tested with a 10/1000 µs waveform. This value is guaranteed across temperature and lot variations, providing a deterministic overvoltage ceiling for downstream IC protection.
How does SMBJ70AH compare to SMBJ70H in terms of leakage and clamping?
SMBJ70AH offers tighter VBR tolerance (77.8–86.0 V vs. 77.8–95.1 V for SMBJ70H) and lower clamping voltage (113 V vs. 125 V), resulting in improved protection margin. Its ID @ VWM remains <1 µA - identical to SMBJ70H - ensuring equivalent low-power system compatibility.
SMBJ70AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ70AH FAQ
1.How can I place an order for SMBJ70AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70AH 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 SMBJ70AH reliable?
The price and inventory of SMBJ70AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70AH is usually 5 days.
3.What payment methods are accepted for SMBJ70AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70AH?
SMBJ70AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70AH 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 SMBJ70AH?
For technical support, including SMBJ70AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70AH requirements.
6.How does Aetrix verify that SMBJ70AH is sourced from the original manufacturer or authorized distributors?
All SMBJ70AH 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 SMBJ70AH meets industry standards.
7.What is the process for return or replacement of SMBJ70AH?
All SMBJ70AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70AH, 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 SMBJ70AH part is unused and in its original packaging.
Return procedure for SMBJ70AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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