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Vishay General Semiconductor - Diodes Division SMBJ70CHE3/52
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- Part No.:
- SMBJ70CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CHE3/52.pdf
- Description:
- TVS DIODE 70VWM 125VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,887
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Product details
Overview
SMBJ70CHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 5.3 A peak pulse current, and 600 W peak pulse power rating with a 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMBJ70CHE3/52 datasheet, SMBJ70CHE3/52 pinout, SMBJ70CHE3/52 application, or SMBJ70CHE3/52 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and RoHS-compliant packaging details required for automotive-grade ESD/surge co-design and layout validation.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VWM (70 V), then avalanches to clamp at ≤113 V while diverting up to 5.3 A (10/1000 µs). Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns).
Thermally, it uses the SMB package with RθJL = 20 °C/W (junction-to-lead) and is rated for 150 °C maximum junction temperature. The HE3 suffix confirms AEC-Q101 qualification, RoHS compliance, and suitability for automotive under-hood applications per JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V/24 V automotive systems. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above nominal system voltage with margin. |
| VC @ IPPM | 113 V at 5.3 A - Clamped voltage during 10/1000 µs surge; determines protected IC's voltage stress limit. |
| PPPM | 600 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IFSM | 100 A - Non-repetitive forward surge current (8.3 ms half-sine); enables tolerance of load-dump transients in vehicle power networks. |
| TJ Range | –55 °C to +150 °C - Full automotive temperature range; validated for engine control, ADAS, and body electronics mounting locations. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB copper area requirements for thermal derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 12 V rail); conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground plane; completes clamping loop with minimal inductance for effective surge suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity, and mechanical shock - required for ECU, infotainment, and ADAS modules. |
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity standards without external series impedance or derating penalties. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA) across temperature and lifetime - critical for low-power sensor interfaces. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant & halogen-free option available | HE3 suffix meets global environmental regulations and automotive OEM material declarations (e.g., IMDS, ELV). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VIN and GND, upstream of LDO or DC/DC converter. Use Value: Limits transient voltage to ≤113 V, preventing latch-up or permanent damage to 16-bit MCUs rated for 13.2 V max absolute input. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter) from ESD and inductive switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point, shunting fast transients before reaching op-amp or ADC front-end. Use Value: Sub-ns response clamps 8 kV contact ESD (IEC 61000-4-2) to <150 V, preserving 16-bit measurement accuracy and avoiding calibration drift. |
| Telecom DC Power Input Protection | Consumer USB-C Power Delivery Line Protection |
Use Scenario: Securing –48 V DC input of telecom base station power modules against lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Unidirectional TVS installed on primary side of isolated DC/DC converter, referenced to chassis ground. Use Value: Withstands 600 W pulses and 100 A surge (8.3 ms), enabling compliance with GR-1089-CORE Level 3 surge immunity requirements. |
Use Scenario: Protecting USB-C VBUS line (up to 20 V) in portable monitors against hot-plug transients and cable ESD events. IC Role / Device Role / Timing Role: TVS placed adjacent to USB-C receptacle, cathode to VBUS, anode to ground, minimizing trace inductance. Use Value: Clamps 15 kV air discharge to <120 V within 1 ns, preventing damage to USB PD controller ICs with 22 V absolute max rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70AHE3/52 | Same VWM (70 V), identical SMB package and AEC-Q101 qualification; differs only in base P/N suffix (A vs. C - unidirectional designation confirmed). | No functional difference; both rated for unidirectional clamping. SMBJ70AHE3/52 is the standard unidirectional variant; SMBJ70CHE3/52 reflects same device with alternate marking convention. | Select SMBJ70CHE3/52 when matching legacy BOMs or distributor stock referencing "C" suffix for unidirectional configuration. |
| SMCJ70AHE3/52 | Same VWM and VC, but in larger SMC (DO-214AB) package; higher PPPM = 1500 W, lower RθJA = 50 °C/W, and IPPM = 13.3 A. | Used where higher surge energy handling or improved thermal performance is required - e.g., main board-level protection vs. point-of-load. | Choose SMCJ70AHE3/52 if PCB layout allows larger footprint and system-level surge tests exceed 600 W; otherwise SMBJ70CHE3/52 optimizes space-constrained automotive modules. |
Compared with SMBJ70AHE3/52, SMBJ70CHE3/52 is functionally identical and interchangeable; versus SMCJ70AHE3/52, it trades surge capacity and thermal headroom for compact SMB footprint - making it optimal for dense automotive PCBs where 600 W clamping suffices and board area is constrained.
Availability
SMBJ70CHE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and telecom power supply designs requiring stable component supply with AEC-Q101 assurance and full RoHS compliance.
Supply support for SMBJ70CHE3/52 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMBJ series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping performance and AEC-Q101 validation.
FAQ
What is the clamping voltage of SMBJ70CHE3/52 and how does it protect downstream components?
The SMBJ70CHE3/52 has a maximum clamping voltage (VC) of 113 V at 5.3 A peak pulse current (10/1000 µs). This means that during a surge event exceeding its 70 V stand-off voltage, the device rapidly avalanches and limits the voltage seen by downstream ICs to ≤113 V. For example, in a 12 V automotive system, this prevents overvoltage damage to MCUs, CAN transceivers, or power management ICs rated for ≤16 V absolute maximum, ensuring system-level surge immunity without redesigning the entire power architecture. The SMBJ70CHE3/52 achieves this via a glass-passivated silicon junction with sub-nanosecond response.
Is SMBJ70CHE3/52 qualified for automotive applications, and what does the HE3 suffix indicate?
Yes, SMBJ70CHE3/52 is AEC-Q101 qualified - validated for automotive use across temperature cycling, mechanical shock, and humidity testing. The HE3 suffix explicitly denotes RoHS-compliant construction with AEC-Q101 qualification, matte tin-plated leads, and JESD201 Class 2 whisker resistance. This makes SMBJ70CHE3/52 suitable for under-hood and cabin applications including engine control modules, body controllers, and ADAS camera power rails - unlike commercial-grade variants (e.g., E3 suffix only) which lack automotive stress validation.
How does the SMB (DO-214AA) package of SMBJ70CHE3/52 impact PCB layout and thermal design?
The SMB (DO-214AA) package of SMBJ70CHE3/52 measures 4.57 mm × 3.94 mm with 1.52 mm height, enabling high-density placement near connectors or IC power pins. Its RθJA of 100 °C/W assumes 0.2" × 0.2" copper pads per terminal; reducing pad size increases thermal resistance and requires derating per Fig. 2 in the datasheet. Layout best practices include short, wide traces to minimize inductance, direct cathode-to-ground-plane connection, and avoidance of vias in the current path - all critical to achieving the specified 113 V clamping performance during fast transients.
What is the difference between SMBJ70CHE3/52 and SMBJ70AHE3/52, and are they interchangeable?
SMBJ70CHE3/52 and SMBJ70AHE3/52 are functionally identical unidirectional TVS diodes with matching VWM (70 V), VBR (77.8–86.0 V), VC (113 V), and AEC-Q101 qualification. The "C" and "A" suffixes both denote unidirectional polarity per Vishay's naming convention for this family - confirmed in the "DEVICE TYPE" column of the Electrical Characteristics table. No electrical, thermal, or mechanical differences exist; they are fully interchangeable in BOMs, layouts, and production. SMBJ70CHE3/52 is simply an alternate marking variant used by certain distribution channels.
Can SMBJ70CHE3/52 be used for bidirectional transient protection, and what alternative should be selected if bidirectional clamping is needed?
No, SMBJ70CHE3/52 is strictly unidirectional - its cathode band marks the polarity-sensitive terminal, and it only clamps in reverse bias. For bidirectional protection (e.g., AC signal lines or differential buses), select SMBJ70CAHE3/52 instead. That variant has symmetrical breakdown in both directions (VBR = 77.8–86.0 V bi-directionally), same 113 V clamping, and identical SMB package and AEC-Q101 qualification. Using SMBJ70CHE3/52 in a bidirectional circuit would result in forward conduction and potential failure during negative transients - so polarity alignment and application topology must be verified before deployment.
SMBJ70CHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- 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 (SMBJ)
SMBJ70CHE3/52 FAQ
1.How can I place an order for SMBJ70CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CHE3/52 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 SMBJ70CHE3/52 reliable?
The price and inventory of SMBJ70CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ70CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CHE3/52?
SMBJ70CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CHE3/52 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 SMBJ70CHE3/52?
For technical support, including SMBJ70CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CHE3/52 requirements.
6.How does Aetrix verify that SMBJ70CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ70CHE3/52 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 SMBJ70CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ70CHE3/52?
All SMBJ70CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CHE3/52, 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 SMBJ70CHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ70CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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