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Taiwan Semiconductor Corporation SMBJ70H
- Part No.:
- SMBJ70H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70H.pdf
- Description:
- 600W, 86.5V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,602
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Product details
Overview
SMBJ70H from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 70V working stand-off voltage (VWM), 77.8–95.1V breakdown voltage (VBR), 125V maximum clamping voltage (VC) at 5.0A peak pulse current (IPP), and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SMBJ70H datasheet, SMBJ70H pinout, SMBJ70H application, or SMBJ70H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, junction-to-ambient thermal resistance (55°C/W), moisture sensitivity level 1 compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMBJ70H operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to ESD and lightning-induced surges. Its 125V clamping voltage at 5.0A IPP ensures robust protection of downstream 70V-rated power rails and signal lines without overstressing connected ICs.
Thermally, it supports continuous operation up to +150°C junction temperature and exhibits 10°C/W junction-to-case and 55°C/W junction-to-ambient thermal resistance. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability automotive PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum DC or continuous reverse operating voltage before leakage exceeds 1 µA; defines safe standoff for 70V power rail protection. |
| VBR min/max | 77.8 / 95.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on during transients. |
| VC @ IPP | 125 V at 5.0 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; limits stress on downstream components. |
| PPK | 600 W - Peak pulse power handling capability per 10/1000 µs waveform; supports ISO 7637-2 Pulse 1 & 2b immunity testing. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, RoHS and halogen-free compliant, weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes conduction path during reverse-biased transient clamping. |
| Cathode (banded end) | High-side connection point | Connected to protected line (e.g., 70V supply rail); blocks normal operation but avalanches during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body controllers, and ADAS sensors requiring zero-failure reliability. |
| Clamping voltage ≤125 V @ 5.0 A | Ensures protected 70V circuits remain below absolute maximum ratings during ISO 7637-2 Pulse 2b (inductive load dump) events. |
| Response time <1.0 ps | Fast enough to suppress ESD events (IEC 61000-4-2) before damage occurs to sensitive CAN/LIN transceivers or microcontrollers. |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow soldering; supports standard SMT assembly without process modification. |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation required for automotive interior and under-hood modules meeting OEM safety standards. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 70V battery-fed ECUs against load dump transients per ISO 7637-2 Pulse 2b (up to 110V, 400ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between 70V supply rail and chassis ground to clamp surges before they reach PMICs and MCU power inputs. Use Value: Limits clamped voltage to 125V, well below typical 130V absolute maximum ratings of automotive-grade DC/DC converters. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules exposed to EFT bursts. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients (IEC 61000-4-4, 5 kHz burst) before reaching op-amp front-end stages. Use Value: Sub-1.0 ps response prevents transient coupling into high-impedance sensor signal paths, preserving measurement integrity. |
| LED Driver Overvoltage Suppression | Telecom DC Feeder Line Protection |
Use Scenario: Shielding constant-current LED drivers in commercial lighting from switching surges generated by nearby contactors or relays. IC Role / Device Role / Timing Role: Placed across driver output terminals to absorb inductive kickback energy during MOSFET turn-off. Use Value: 600W peak power rating handles repetitive 10/1000 µs surges without degradation, extending driver lifetime in harsh electrical environments. |
Use Scenario: Protecting PoE-powered telecom equipment connected to long outdoor DC feeder lines susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Installed on DC input side of DC-DC converter to limit incoming transients before isolation stage. Use Value: 125V clamping voltage ensures downstream 100V-rated input capacitors and controllers remain within safe operating area. |
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 SMAJ70A | Same DO-214AC (SMA) package; slightly higher VC = 137 V @ 4.4 A; lower PPK = 400 W. | Lower power rating limits suitability for ISO 7637-2 Pulse 1 (high-energy) testing; better fit for ESD-only scenarios. | Select SMAJ70A only when board space allows SMA footprint and system-level surge testing does not require full 600W capability. |
| Vishay SMF70A | DO-219AB (SOD-123FL) package; smaller footprint; VC = 124 V @ 4.3 A; PPK = 200 W. | Insufficient for automotive load dump; intended for portable electronics and low-energy signal-line protection. | Choose SMF70A for space-constrained consumer devices where 600W surge immunity is not required. |
Compared with SMBJ70H, SMAJ70A offers reduced surge margin in same-form-factor packaging, while SMF70A trades power handling for miniaturization-neither provides drop-in replacement due to package or energy rating mismatch.
Availability
SMBJ70H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver overvoltage suppression requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ70H 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V/48V automotive subsystems and industrial equipment demanding high-energy clamping and robust thermal performance.
FAQ
What is the maximum clamping voltage of SMBJ70H and under what test condition?
The SMBJ70H has a maximum clamping voltage (VC) of 125 V, measured at a peak pulse current (IPP) of 5.0 A using a 10/1000 µs waveform. This value is specified in the Electrical Specifications table on page 3 of the Taiwan Semiconductor SMBJH Series datasheet (Version A2102). The clamping performance ensures protected circuits remain within safe voltage limits during standardized surge events such as ISO 7637-2 Pulse 2b.
Is SMBJ70H unidirectional or bidirectional, and how is polarity indicated?
SMBJ70H is a unidirectional TVS diode, with polarity indicated by a cathode band marked on the DO-214AA (SMB) package body. The banded end connects to the protected line (e.g., 70V rail), while the anode connects to ground. Bidirectional variants use "CH" or "CAH" suffixes (e.g., SMBJ70CH), which are distinct part numbers-not interchangeable with SMBJ70H.
Does SMBJ70H meet automotive qualification standards?
Yes, SMBJ70H is AEC-Q101 qualified and meets ISO 7637-2 (Pulse 1/2a/2b/3a/3b) for automotive transient immunity. It also complies with JESD201 Class 2 whisker resistance, J-STD-020 moisture sensitivity level 1, and RoHS/halogen-free requirements per IEC 61249-2-21-making it suitable for under-hood and body-control module applications.
What is the thermal resistance and maximum junction temperature of SMBJ70H?
SMBJ70H has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and a maximum junction temperature (TJ) of +150°C. These values are confirmed in the Thermal Performance section of the datasheet. They enable reliable operation in high-temperature environments such as engine compartments when mounted on standard FR-4 PCBs with recommended pad layout per the package outline drawing.
How does SMBJ70H differ from SMBJ70AH?
SMBJ70H and SMBJ70AH are both unidirectional 70V TVS diodes in DO-214AA packages, but SMBJ70AH has tighter breakdown voltage tolerance (77.8–86.0 V vs. 77.8–95.1 V for SMBJ70H) and slightly lower clamping voltage (113 V vs. 125 V at respective IPP). SMBJ70AH is optimized for applications requiring more precise VBR control, while SMBJ70H offers broader manufacturing tolerance and higher surge margin.
SMBJ70H 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:
- 125V
- Current - Peak Pulse (10/1000µs):
- 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)
SMBJ70H FAQ
1.How can I place an order for SMBJ70H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70H 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 SMBJ70H reliable?
The price and inventory of SMBJ70H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70H is usually 5 days.
3.What payment methods are accepted for SMBJ70H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70H?
SMBJ70H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70H 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 SMBJ70H?
For technical support, including SMBJ70H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70H requirements.
6.How does Aetrix verify that SMBJ70H is sourced from the original manufacturer or authorized distributors?
All SMBJ70H 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 SMBJ70H meets industry standards.
7.What is the process for return or replacement of SMBJ70H?
All SMBJ70H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70H, 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 SMBJ70H part is unused and in its original packaging.
Return procedure for SMBJ70H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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