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Taiwan Semiconductor Corporation SMBJ8.5CAH
- Part No.:
- SMBJ8.5CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAH.pdf
- Description:
- 600W, 9.9V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
SMBJ8.5CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features 8.5V working stand-off voltage (VWM), 9.44–10.4V breakdown voltage (VBR), 14.4V maximum clamping voltage (VC) at 10A peak impulse current, and 600W peak pulse power rating per 10/1000µs waveform - deployed in automotive lighting control modules to protect CAN transceivers and microcontrollers from ISO 7637-2 Pulse 1/2a/3b transients.
For engineers reviewing the SMBJ8.5CAH datasheet, SMBJ8.5CAH pinout, SMBJ8.5CAH application, or SMBJ8.5CAH equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, moisture sensitivity level 1 compliance, and verified clamping voltage under 10A IPP for robust system-level immunity design.
Technical Context
The SMBJ8.5CAH implements a glass-passivated silicon junction optimized for fast response (<1.0ps) and low leakage (<1μA at VWM). Its bidirectional configuration enables symmetrical clamping in both polarities without external polarity management, meeting ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), and Pulse 3b (capacitive coupling) requirements.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to TJ = 150°C. The device operates across -55°C to +150°C ambient range and is rated for 100A non-repetitive forward surge (IFSM) in unidirectional mode - though SMBJ8.5CAH itself is bidirectional and does not conduct forward current in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum DC or RMS voltage the device blocks continuously without clamping |
| VBR min/max | 9.44 V / 10.4 V @ IT = 1 mA - Ensures reliable turn-on before downstream IC damage thresholds |
| VC @ IPP | 14.4 V @ 10 A - Clamps induced surges to safe levels for 3.3V/5V logic interfaces |
| PPK | 600 W - Withstands 10/1000µs transients common in automotive load-dump and EFT events |
| ID @ VWM | <1 µA - Minimizes standby power loss and avoids false triggering in high-impedance sensing nodes |
| Package | DO-214AA (SMB) - Surface-mount footprint compatible with automated placement and IPC-7351B standard land patterns |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional SMBJ8.5CAH; terminals are symmetric).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional clamping node | Either terminal serves as input/output for transient energy diversion; no polarity dependency in layout |
| Case | Non-connected thermal path | No internal connection to die; mechanical mounting only - no grounding or shielding function |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood and body-control applications per stress test conditions including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under humidity and thermal aging |
| Clamping voltage ≤14.4 V @ 10 A | Protects 5V-tolerant interfaces (e.g., LIN, CAN FD PHY, MCU GPIO) without overvoltage stress during ISO 7637-2 Pulse 3b |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or dry-pack handling - reduces manufacturing overhead |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp modules from load-dump transients during battery switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail and ground, clamping ±100V spikes within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in 5V logic rails while maintaining AEC-Q101 compliance for OEM Tier-1 supply. | Use Scenario: Shielding analog front-end (AFE) inputs of industrial pressure sensors from EFT bursts in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, suppressing 5kV EFT pulses per IEC 61000-4-4. Use Value: Limits voltage excursion to <15V during 10A transients, preserving ADC reference integrity and avoiding firmware reset triggers. |
| Automotive Body Control Module | Smart Home Power Supply Input |
Use Scenario: Safeguarding LIN bus transceivers and power management ICs against coupled noise from solenoid actuation in door lock systems. IC Role / Device Role / Timing Role: Bidirectional clamping element on 12V supply rail, responding in <1ps to fast-rising transients from inductive loads. Use Value: Maintains communication uptime during repeated Pulse 2a events (battery disconnection) without degradation over 10,000 cycles. | Use Scenario: Protecting AC-DC adapter primary-side controllers from lightning-induced surges entering via mains input. IC Role / Device Role / Timing Role: Secondary-stage TVS on DC output rail, absorbing residual energy after MOV-based primary suppression. Use Value: Delivers 600W peak power handling with 14.4V clamping to prevent overvoltage shutdown in USB-PD and Qi charging circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA | Same electrical specs but not AEC-Q101 qualified; MSL level 1 retained | Not approved for automotive production; suitable for industrial or consumer designs with lower reliability requirements | Select SMBJ8.5CA only when AEC-Q101 certification is not mandated and cost optimization is prioritized |
| SAC8.5 | Same VWM/VBR/VC ratings but lower PPK (400W); different thermal resistance (RθJA = 65°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or sustained load-dump events | Choose SAC8.5 only for space-constrained consumer electronics where 400W peak power suffices and automotive qualification is irrelevant |
Compared with SMBJ8.5CA and SAC8.5, the SMBJ8.5CAH delivers certified automotive reliability, full 600W surge capacity, and tighter clamping - making it the sole choice for safety-critical 12V rail protection where failure modes must meet OEM zero-defect targets.
Availability
SMBJ8.5CAH is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and body control module designs requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for SMBJ8.5CAH 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 for automotive and industrial markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems - emphasizing low clamping voltage, high surge robustness, and zero-bake manufacturability.
FAQ
What is the clamping voltage of SMBJ8.5CAH at its rated peak pulse current?
The SMBJ8.5CAH has a maximum clamping voltage (VC) of 14.4 V at 10 A peak impulse current (IPP), measured using the standardized 10/1000 µs double-exponential waveform. This value ensures compatibility with 5V logic interfaces and prevents overvoltage damage to downstream ICs such as CAN transceivers or microcontroller I/O pins during transient events like ISO 7637-2 Pulse 3b. The SMBJ8.5CAH maintains this clamping performance across its full operating temperature range.
Is SMBJ8.5CAH suitable for bidirectional signal line protection?
Yes, SMBJ8.5CAH is explicitly designed for bidirectional protection, as indicated by the "CAH" suffix and confirmed in the datasheet's "Devices for Bipolar Applications" section. Its symmetrical breakdown and clamping behavior in both polarities eliminates the need for polarity-aware layout or additional components. The SMBJ8.5CAH is commonly used across differential buses (e.g., LIN, RS-485 stubs) and ungrounded power rails where reverse-polarity transients must be suppressed without circuit redesign.
Does SMBJ8.5CAH require special handling during PCB assembly?
No, SMBJ8.5CAH has Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be stored and processed under standard factory ambient conditions without baking or dry-pack requirements. Its matte tin-plated leads are solderable per J-STD-002, supporting conventional reflow profiles including lead-free (J-STD-020C). The SMBJ8.5CAH is optimized for high-yield automated placement in automotive electronics manufacturing lines.
How does SMBJ8.5CAH differ from SMBJ8.5AH?
SMBJ8.5CAH is the bidirectional variant, whereas SMBJ8.5AH is unidirectional. The "C" in CAH denotes center-tap or bipolar configuration - enabling symmetrical clamping in both directions - while AH supports only anode-to-cathode conduction. Electrically, SMBJ8.5CAH shares identical VWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V) specs with SMBJ8.5AH but lacks polarity marking and supports reverse-transient suppression critical for floating or AC-coupled rails. The SMBJ8.5CAH is required where bidirectional surge paths exist, such as in LIN bus or isolated sensor supplies.
What automotive standards does SMBJ8.5CAH meet?
SMBJ8.5CAH meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), Pulse 2b (supply interruption), and Pulses 3a/3b (capacitive coupling and EFT). It is also AEC-Q101 qualified for stress testing including HTGB, H3TRB, and temperature cycling. These certifications confirm the SMBJ8.5CAH's suitability for deployment in engine control units, body control modules, and ADAS domain controllers where functional safety and long-term field reliability are mandatory.
SMBJ8.5CAH 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 43A
- 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)
SMBJ8.5CAH FAQ
1.How can I place an order for SMBJ8.5CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAH 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 SMBJ8.5CAH reliable?
The price and inventory of SMBJ8.5CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CAH is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAH?
SMBJ8.5CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAH 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 SMBJ8.5CAH?
For technical support, including SMBJ8.5CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAH requirements.
6.How does Aetrix verify that SMBJ8.5CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAH 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 SMBJ8.5CAH meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAH?
All SMBJ8.5CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAH, 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 SMBJ8.5CAH part is unused and in its original packaging.
Return procedure for SMBJ8.5CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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