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Taiwan Semiconductor Corporation SMBJ70CH
- Part No.:
- SMBJ70CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CH.pdf
- Description:
- 600W, 86.5V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,797
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Product details
Overview
SMBJ70CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 70 V working stand-off voltage (VWM), 125 V maximum clamping voltage (VC) at 5.0 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive switching immunity.
For engineers reviewing the SMBJ70CH datasheet, SMBJ70CH pinout, SMBJ70CH application, or SMBJ70CH equivalent, this device is selected for robust overvoltage protection in 24 V and 48 V DC systems where low clamping ratio, low leakage (<1 µA @ 70 V), and DO-214AA (SMB) package compatibility are critical design requirements.
Technical Context
The SMBJ70CH is a unidirectional/bidirectional TVS diode configured as a single die in a DO-214AA (SMB) package with cathode band marking. Its bidirectional operation enables symmetrical clamping across both polarities without external polarity management, supporting protection of AC-coupled or floating signal lines and dual-rail power domains.
It delivers fast transient suppression via avalanche breakdown with typical junction capacitance of ~100 pF at 0 V (f = 1 MHz), and thermal performance characterized by RθJC = 10 °C/W and RθJA = 55 °C/W - enabling reliable operation up to TJ = 150 °C in constrained PCB layouts with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC RMS operating margin. |
| VBR min / max | 77.8 V / 95.1 V @ IT = 1 mA - Breakdown voltage range ensures consistent avalanche initiation across production lots. |
| VC @ IPP | 125 V @ 5.0 A (10/1000 µs) - Clamping voltage limits downstream component stress during standardized surge events. |
| PPK | 600 W - Peak pulse power handling capacity per IEC 61000-4-5 and ISO 7637-2 Pulse 5a compliance. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensing circuits. |
| Response time | <1.0 ps - Enables effective suppression of nanosecond-scale ESD transients (IEC 61000-4-2). |
| TJ max | +150 °C - Supports under-hood automotive environments and industrial enclosures without derating. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.090 g. Meets UL 94V-0, JESD201 Class 2 whisker resistance, and J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias; reference node in bidirectional configuration | Connected to protected line or ground return path depending on layout; symmetric terminal function in CH variant. |
| Cathode (banded end) | Current exit point in forward bias; clamping reference node | Marked terminal identifies polarity; in SMBJ70CH, both terminals behave identically under reverse/forward surge due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure. |
| ISO 7637-2 compliance | Guarantees protection against real-world automotive transients: Pulse 1 (inductive load dump), Pulse 2a/2b (switching spikes), Pulse 3a/3b (line impedance coupling). |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing and end-of-life processing. |
| Fast response & low clamping ratio | Clamping ratio VC/VBR ≈ 1.29–1.61 ensures minimal overvoltage overshoot during fast transients, protecting sensitive gate drivers and microcontrollers. |
Applications
| Automotive Power Rail Protection | Industrial CAN Bus Transceivers |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load-dump surges (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed between power rail and ground, absorbing >600 W transient energy within nanoseconds. Use Value: Limits rail voltage to ≤125 V during 35 V/100 ms load dump, preventing damage to 36 V-rated DC-DC converters and MCU power supplies. | Use Scenario: Shielding CANH/CANL differential pair from ESD (±8 kV contact) and burst noise in factory automation nodes. IC Role / Device Role / Timing Role: Bidirectional shunt protector across differential bus lines, leveraging symmetric clamping to preserve signal integrity. Use Value: Maintains <100 pF junction capacitance to avoid CAN bit-rate degradation at 1 Mbps while clamping ±125 V transients. |
| LED Driver Input Stage | Programmable Logic Controller (PLC) Digital Inputs |
Use Scenario: Safeguarding constant-current LED driver ICs from inductive kickback when driving solenoid-based dimming circuits. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor, conducting surge current away from driver FETs and sense resistors. Use Value: Withstands 100 A IFSM (8.3 ms half-sine) and clamps to 125 V, preventing gate oxide rupture in 100 V-rated MOSFETs. | Use Scenario: Protecting 24 V digital input channels on modular PLC backplanes from field-wiring ESD and accidental 120 VAC misconnection. IC Role / Device Role / Timing Role: Front-end overvoltage clamp on each isolated input channel, upstream of optocoupler or digital isolator. Use Value: Delivers <1 µA leakage at 70 V to avoid false logic states, while surviving repeated 1 kV/500 Ω surge pulses per IEC 61000-4-4. |
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; slightly higher VC = 135 V @ 4.7 A; lower PPK = 400 W. | Lower power handling limits suitability for ISO 7637-2 Pulse 5a; better fit for space-constrained consumer designs. | Select SMAJ70CA only if board area is critical and surge energy is limited to ≤400 W. |
| ON Semiconductor SMCJ70CA | DO-214AB (SMC) package; larger footprint; VC = 125 V @ 5.0 A; PPK = 1500 W; higher IFSM = 200 A. | Overqualified for SMB-level layouts but preferred for high-reliability industrial motor drives requiring >1 kW surge margin. | Choose SMCJ70CA when system-level surge testing exceeds 600 W or when thermal mass improves long-pulse survivability. |
Compared with SMAJ70CA and SMCJ70CA, the SMBJ70CH offers optimal balance of 600 W surge capability, DO-214AA (SMB) footprint compatibility, and AEC-Q101 qualification - making it the preferred choice for automotive body control modules and compact industrial sensors where space, qualification, and standardized pulse handling are jointly constrained.
Availability
SMBJ70CH is available at Aetrix Electronics and suitable for automotive electronics, industrial communication interfaces, LED lighting systems, and programmable logic controller inputs requiring stable component supply and full traceability.
Supply support for SMBJ70CH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive and harsh-environment industrial applications demanding high-reliability, low-leakage, and ISO 7637-2-certified transient suppression in compact surface-mount packages.
FAQ
What does the 'CH' suffix indicate in SMBJ70CH?
The 'CH' suffix in SMBJ70CH denotes a bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants (e.g., SMBJ70H), SMBJ70CH has no designated anode or cathode for functional operation - both terminals behave identically under reverse and forward surge conditions, simplifying layout in AC-coupled or floating signal paths.
Is SMBJ70CH compatible with lead-free reflow soldering processes?
Yes, SMBJ70CH is fully compatible with standard lead-free reflow profiles (per J-STD-020). Its matte tin-plated leads meet solderability requirements per J-STD-002, and the molding compound is rated UL 94V-0. The device supports peak temperatures up to 260 °C for 30 seconds, with moisture sensitivity level 1 - eliminating bake requirements prior to assembly.
How does SMBJ70CH perform under repeated surge stress?
SMBJ70CH is rated for non-repetitive surges per 10/1000 µs waveform; its datasheet does not specify repetitive surge endurance. For applications involving frequent transients (e.g., motor commutation), derating is required using Fig. 2 (Pulse Derating Curve). At 85 °C ambient, its peak pulse power drops to ~420 W - engineers must verify cumulative energy per event stays below 600 W and allow thermal recovery between pulses.
Can SMBJ70CH replace SMBJ70H in an existing design?
SMBJ70CH can replace SMBJ70H only if the circuit requires bidirectional protection and the layout accommodates identical DO-214AA (SMB) mechanical dimensions. While electrical parameters (VWM, VC, PPK) are closely matched, SMBJ70H is unidirectional and relies on correct cathode orientation. Swapping without verifying polarity and clamping symmetry may result in incomplete protection or forward conduction during negative transients.
What is the maximum junction temperature rating for SMBJ70CH?
The maximum junction temperature (TJ) for SMBJ70CH is +150 °C, as specified in the Absolute Maximum Ratings table. This rating applies under steady-state and transient conditions, provided thermal design maintains junction-to-case resistance (RθJC = 10 °C/W) and junction-to-ambient resistance (RθJA = 55 °C/W) within limits. Exceeding +150 °C risks irreversible parametric shift or catastrophic failure.
SMBJ70CH 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:
- 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)
SMBJ70CH FAQ
1.How can I place an order for SMBJ70CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CH 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 SMBJ70CH reliable?
The price and inventory of SMBJ70CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CH is usually 5 days.
3.What payment methods are accepted for SMBJ70CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CH?
SMBJ70CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CH 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 SMBJ70CH?
For technical support, including SMBJ70CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CH requirements.
6.How does Aetrix verify that SMBJ70CH is sourced from the original manufacturer or authorized distributors?
All SMBJ70CH 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 SMBJ70CH meets industry standards.
7.What is the process for return or replacement of SMBJ70CH?
All SMBJ70CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CH, 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 SMBJ70CH part is unused and in its original packaging.
Return procedure for SMBJ70CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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