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Taiwan Semiconductor Corporation SMCJ8.5AH
- Part No.:
- SMCJ8.5AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AH.pdf
- Description:
- 1500W, 9.9V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
SMCJ8.5AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 9.44V min / 10.4V max breakdown voltage at 1mA, 8.5V working stand-off voltage, and 14.4V maximum clamping voltage at 20A peak pulse current-designed for automotive-grade ESD and load-switching surge protection in power supply inputs.
For engineers reviewing the SMCJ8.5AH datasheet, SMCJ8.5AH pinout, SMCJ8.5AH application, or SMCJ8.5AH equivalent, key selection criteria include AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0ps response time, ≤1µA reverse leakage above 10V, and DO-214AB thermal performance (RθJC = 10°C/W).
Technical Context
The SMCJ8.5AH is a single-die, glass-passivated junction TVS diode optimized for fast clamping of high-energy transients. Its unidirectional configuration provides forward conduction path during overvoltage events while maintaining low leakage (<1µA at 8.5V) and tight VBR tolerance (±5.5% typical across 9.44–10.4V).
It operates within -55°C to +150°C junction temperature range and delivers 1500W peak pulse power (10/1000µs waveform), with clamping voltage stabilized at 14.4V under 20A impulse-enabling robust protection of 12V automotive and industrial DC rails without compromising downstream IC reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; matches nominal 12V system derated for ripple and tolerance. |
| VBR @ IT=1mA | 9.44–10.4 V - Verified breakdown threshold ensuring reliable turn-on prior to damage of protected circuitry. |
| VC @ IPPM=20A | 14.4 V - Clamped voltage during 10/1000µs surge; keeps downstream 12V-rated components below absolute maximum ratings. |
| PPK | 1500 W - Peak pulse power handling per IEEE C62.35; supports repeated ISO 7637-2 Pulse 5a/b surges without degradation. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life in always-on automotive modules. |
| TJ max | +150 °C - Enables placement near hot components (e.g., power MOSFETs, DC-DC converters) without thermal derating. |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path | Connected to ground or low-impedance chassis return; completes clamping loop during positive transients. |
| Cathode | Protected line connection | Connected to input rail (e.g., 12V battery feed); blocks normal operation but conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock per stress test plan. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without failure. |
| Glass passivated junction | Ensures stable VBR and low leakage over 15+ year field life in humid, high-vibration environments. |
| Fast response time | <1.0 ps rise-to-breakdown enables protection of high-speed interfaces (e.g., CAN FD, LIN) upstream of filtering stages. |
Applications
| Automotive Power Input Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery feed to body control module (BCM) exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to shunt >100V transients before reaching DC-DC converter input. Use Value: Limits clamped voltage to 14.4V, preventing overstress of 16V-rated input capacitors and enabling use of cost-optimized 25V-input buck regulators. | Use Scenario: 24V DC input to programmable logic controller (PLC) digital input card subject to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Standoff protector on field-side terminal block, coordinated with series impedance and filtering to meet IEC 61000-4-5 Level 3. Use Value: Delivers 1500W surge capacity with sub-1µA leakage-preserving signal integrity and reducing false triggering in high-density I/O designs. |
| Telecom Power Supply Clamp | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-side 12V rail in PoE-powered network switch experiencing induced lightning surges via Ethernet cabling. IC Role / Device Role / Timing Role: Final-stage TVS on DC-DC output, sized to clamp residual transients that bypass primary-side isolation and common-mode chokes. Use Value: 14.4V clamping ensures safe operation of 12V logic and PHY ICs rated to 16V absolute maximum, eliminating need for higher-voltage (and higher-cost) components. | Use Scenario: 12V auxiliary supply feeding microcontroller and gate driver in smart washing machine motor control board. IC Role / Device Role / Timing Role: Unidirectional suppressor on VCC rail adjacent to H-bridge MOSFET drivers to absorb commutation spikes from brushed DC motor back-EMF. Use Value: Fast <1ps response captures sub-microsecond spikes before they propagate into MCU reset circuitry or analog sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A | 600W rating, SMA package (smaller footprint, higher RθJA = 85°C/W), same VWM/VBR spec. | Limited to lower-energy transients (e.g., ESD-only); unsuitable for ISO 7637-2 Pulse 5a/b load dump. | Select when space-constrained and surge energy is limited to IEC 61000-4-2/4-4 only. |
| SMCJ8.5A | Same 1500W rating and DO-214AB package, but non-AEC-Q101; VBR min/max wider (9.44–11.5V vs. 9.44–10.4V). | Acceptable for industrial/commercial use where automotive qualification is not mandated. | Choose for cost-sensitive non-automotive designs requiring identical thermal and electrical performance. |
Compared with SMAJ8.5A and SMCJ8.5A, the SMCJ8.5AH provides tighter VBR tolerance and AEC-Q101 validation-critical for automotive systems requiring consistent clamping behavior across temperature and lifetime, while maintaining full 1500W surge capability in the industry-standard SMC package.
Availability
SMCJ8.5AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom power supplies requiring stable component supply with AEC-Q101 assurance, ISO 7637-2 compliance, and high-reliability surface-mount surge protection.
Supply support for SMCJ8.5AH 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 devices since 1979.
The SMCJ series belongs to TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial applications demanding high surge immunity, low leakage, and long-term stability under thermal and mechanical stress.
FAQ
What is the clamping voltage of SMCJ8.5AH at its rated peak pulse current?
The SMCJ8.5AH has a maximum clamping voltage (VC) of 14.4 V at 20 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain within safe operating limits during high-energy transients. The SMCJ8.5AH maintains this clamping performance across its full operating temperature range (-55°C to +150°C).
Is SMCJ8.5AH suitable for bidirectional transient protection?
No, the SMCJ8.5AH is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional protection in the same voltage class, Taiwan Semiconductor specifies part numbers with "CH" or "CAH" suffixes (e.g., SMCJ8.5CH). Using SMCJ8.5AH in reverse-biased configurations may result in premature failure or undefined clamping behavior. Always verify polarity alignment during PCB layout.
Does SMCJ8.5AH meet automotive qualification standards?
Yes, the SMCJ8.5AH is explicitly AEC-Q101 qualified and meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b. It is designed for under-hood and body electronics applications where reliability under thermal cycling, vibration, and high-energy surges is mandatory. The device's glass passivated junction and moisture sensitivity level 1 rating further support automotive manufacturing processes.
What is the maximum steady-state power dissipation for SMCJ8.5AH?
The SMCJ8.5AH has a steady-state power dissipation (PD) rating of 5 W at 25°C ambient temperature. This value applies only to continuous DC or low-frequency conditions-not transient events. In practice, the device is used for short-duration surges; sustained power dissipation must be thermally managed using PCB copper area and layout per TSC's recommended pad dimensions to maintain junction temperature below 150°C.
How does the marking code "GDT" relate to SMCJ8.5AH?
The marking code "GDT" is the laser-etched top-side identifier for the SMCJ8.5AH device, as specified in Taiwan Semiconductor's ordering documentation. It appears adjacent to the cathode band on the DO-214AB package and uniquely identifies this variant within the SMCJx(A)H family. This marking enables traceability and visual verification during assembly and inspection, distinguishing it from similar variants like SMCJ8.5H (GDS) or SMCJ8.5A (not applicable-"A" denotes tighter VBR tolerance).
SMCJ8.5AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 109A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ8.5AH FAQ
1.How can I place an order for SMCJ8.5AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AH 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 SMCJ8.5AH reliable?
The price and inventory of SMCJ8.5AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5AH is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AH?
SMCJ8.5AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AH 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 SMCJ8.5AH?
For technical support, including SMCJ8.5AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AH requirements.
6.How does Aetrix verify that SMCJ8.5AH is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AH 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 SMCJ8.5AH meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AH?
All SMCJ8.5AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AH, 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 SMCJ8.5AH part is unused and in its original packaging.
Return procedure for SMCJ8.5AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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