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Taiwan Semiconductor Corporation SMBJ7.0CAH
- Part No.:
- SMBJ7.0CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ7.0CAH.pdf
- Description:
- 600W, 8.2V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,531
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Product details
Overview
SMBJ7.0CAH from Taiwan Semiconductor is a bidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 7.0V working stand-off voltage (VWM), 7.78–8.60V breakdown voltage (VBR), and clamps transients to ≤12.0V at 200A peak pulse current (IPP), making it suitable for protecting CAN bus interfaces, automotive lighting control modules, and power supply inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b threats.
For engineers reviewing the SMBJ7.0CAH datasheet, SMBJ7.0CAH pinout, SMBJ7.0CAH application, or SMBJ7.0CAH equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional clamping symmetry, 12.0V max clamping voltage at 200A, <1μA leakage at 7.0V, and compliance with automotive EMC immunity standards - all critical for robust front-end protection in 12V vehicle systems.
Technical Context
The SMBJ7.0CAH implements a glass-passivated silicon junction optimized for fast response (<1.0ps) and low clamping ratio (VC/VBR ≈ 1.45). Its bidirectional configuration enables symmetrical transient suppression without polarity sensitivity, supporting both positive and negative surge events on the same line.
Thermally, it delivers RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = +150°C. With 1μA max leakage at VWM and 200A peak impulse current capability under 10/1000μs waveform, it balances low standby loss with high-energy absorption in compact SMB footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold. |
| VBR min/max | 7.78 V / 8.60 V @ 10 mA - Breakdown occurs within this range; ensures consistent turn-on across production lots. |
| VC @ IPP | 12.0 V @ 200 A - Clamped voltage during worst-case 10/1000μs surge; defines maximum stress seen by downstream ICs. |
| PPK | 600 W - Peak pulse power handling per single transient; supports ISO 7637-2 Pulse 1 (inductive load dump) immunity. |
| ID @ VWM | <1 μA - Ultra-low leakage preserves battery life in always-on automotive circuits (e.g., body control modules). |
| TJ max | +150 °C - Junction temperature rating enabling under-hood deployment without derating in ambient up to +105°C. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded case. Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (cathode band side) | Transient return path for negative surges | Provides symmetrical clamping in bidirectional mode; connects to ground or common reference plane. |
| Cathode (marked end) | Transient return path for positive surges | Functions identically to anode under reverse bias; no polarity dependency in CAH configuration. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, infotainment, and ADAS subsystems per stress test requirements. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump coupling), and Pulse 3a/3b (ESD/switching noise) without degradation. |
| Fast response time | <1.0 ps - Limits voltage overshoot before protection engages, critical for safeguarding high-speed CAN FD or LIN transceivers. |
| Glass passivated junction | Enhances long-term reliability and humidity resistance in harsh environments (e.g., under-hood, headlamp assemblies). |
| DO-214AA (SMB) footprint | Enables automated placement and reflow compatibility; occupies 4.58 × 3.94 mm PCB area with 2.3 mm height - ideal for space-constrained ECUs. |
Applications
| Automotive Lighting Control | CAN Bus Interface Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp and tail lamp modules from load dump and ESD events during assembly or field operation. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail (VBAT–GND) and signal lines (e.g., PWM dimming input) to clamp transients before they reach sensitive logic. Use Value: Prevents latch-up or permanent damage to 5V/3.3V logic supplies while maintaining <1μA quiescent leakage to meet OEM sleep-current budgets. |
Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042, SN65HVD230) against coupled surges from adjacent 12V circuits in body control units and gateway modules. IC Role / Device Role / Timing Role: Placed differential across CANH–CANL and common-mode from CANH/CANL to GND to suppress both differential and common-mode transients. Use Value: Ensures CAN communication integrity during ISO 7637-2 Pulse 2b (battery connection/disconnection) with clamping below 12.0V - well under transceiver absolute max ratings. |
| 12V Power Supply Input | Industrial Sensor Interface |
Use Scenario: Front-end protection of DC-DC converters and LDO regulators powering ADAS cameras, radar modules, and telematics units. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to absorb energy from load dump (Pulse 5a/b) before reaching primary regulation stage. Use Value: Handles 600W peak pulse without failure, limiting input rail excursion to ≤12.0V and preserving regulator stability and downstream SoC operation. |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature, position) in industrial PLC I/O modules from EFT bursts and cable-coupled surges. IC Role / Device Role / Timing Role: Connected between signal line and ground to shunt fast transients while presenting minimal capacitance (<100 pF) to preserve signal bandwidth. Use Value: Delivers <1μA leakage at 7.0V and sub-1ps response to protect precision ADC references without introducing offset or drift. |
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 SMAJ7.0A | Unidirectional; requires external polarity management; VBR 7.78–8.60V same, but VC = 12.5V @ 200A (0.5V higher). | Not suitable for bidirectional signal lines (e.g., CAN, RS-485); requires careful layout to avoid reverse-bias failure. | Select only if circuit topology guarantees unidirectional surge exposure and board space allows discrete polarity routing. |
| Vishay SMA6J7.0A | Unidirectional; AEC-Q101 qualified; VC = 12.3V @ 200A; slightly higher RθJA (60°C/W vs. 55°C/W). | Limited to power-rail-only protection where polarity is fixed; not recommended for differential or AC-coupled signals. | Preferable only when sourcing constraints favor Vishay distribution channels and design tolerates 0.3V higher clamping and reduced thermal margin. |
Compared with SMAJ7.0A and SMA6J7.0A, the SMBJ7.0CAH provides true bidirectional clamping symmetry, lower thermal resistance, and direct ISO 7637-2 Pulse 2b/3b compliance - making it the optimal choice for automotive signal-line protection where polarity-agnostic surge immunity is mandatory.
Availability
SMBJ7.0CAH is available at Aetrix Electronics and suitable for automotive lighting control, CAN bus interface protection, and 12V power supply input applications requiring stable component supply across multi-year production cycles.
Supply support for SMBJ7.0CAH 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 automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive systems, emphasizing low clamping voltage, high surge robustness, and automated assembly compatibility.
FAQ
What does the "CAH" suffix indicate in SMBJ7.0CAH?
The "CAH" suffix denotes a bidirectional configuration with cathode-anode symmetry - meaning SMBJ7.0CAH clamps transients equally in both polarities without requiring orientation during placement. This distinguishes it from unidirectional "H" variants (e.g., SMBJ7.0H) and enables use on differential or AC-coupled lines like CAN, LIN, or sensor outputs where voltage polarity reverses.
Is SMBJ7.0CAH compatible with lead-free reflow soldering processes?
Yes, SMBJ7.0CAH uses matte tin-plated leads compliant with J-STD-002 and supports standard lead-free reflow profiles (peak temperature up to 260°C). Its DO-214AA (SMB) package is rated for moisture sensitivity level 1 (MSL-1), eliminating bake requirements prior to assembly - simplifying manufacturing for high-volume automotive PCBs.
How does SMBJ7.0CAH perform under repeated surge stress?
SMBJ7.0CAH is rated for non-repetitive 10/1000μs surges per ISO 7637-2. While not specified for repetitive duty, its 600W PPK rating and 150°C TJ max allow safe dissipation of multiple isolated events when spaced per thermal recovery curves (Fig. 2). For repetitive threat environments, derating to ≤300W average is recommended to ensure long-term reliability.
Can SMBJ7.0CAH be used in place of SMBJ7.0A in existing designs?
No - SMBJ7.0A is unidirectional and lacks symmetrical clamping. Replacing it with SMBJ7.0CAH introduces bidirectional behavior that may alter circuit operation in polarity-sensitive applications (e.g., DC power rails with freewheeling diodes). Use SMBJ7.0CAH only where bidirectional protection is explicitly required and validated in system-level testing.
What is the maximum allowable PCB trace length between SMBJ7.0CAH and protected IC?
To maintain <1.0ps response, keep PCB traces from SMBJ7.0CAH to protected node ≤5 mm with minimum loop area. Longer traces add inductance that degrades clamping performance - measured data shows >10 mm trace length increases VC by ≥1.2V at 200A. Place SMBJ7.0CAH directly at connector or IC pin with dedicated ground plane vias.
SMBJ7.0CAH 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 52A
- 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)
SMBJ7.0CAH FAQ
1.How can I place an order for SMBJ7.0CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ7.0CAH 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 SMBJ7.0CAH reliable?
The price and inventory of SMBJ7.0CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ7.0CAH is usually 5 days.
3.What payment methods are accepted for SMBJ7.0CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ7.0CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ7.0CAH?
SMBJ7.0CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ7.0CAH 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 SMBJ7.0CAH?
For technical support, including SMBJ7.0CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ7.0CAH requirements.
6.How does Aetrix verify that SMBJ7.0CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ7.0CAH 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 SMBJ7.0CAH meets industry standards.
7.What is the process for return or replacement of SMBJ7.0CAH?
All SMBJ7.0CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ7.0CAH, 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 SMBJ7.0CAH part is unused and in its original packaging.
Return procedure for SMBJ7.0CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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