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Vishay General Semiconductor - Diodes Division SMA5J8.5CA-E3/5A
- Part No.:
- SMA5J8.5CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J8.5CA-E3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,342
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Product details
Overview
SMA5J8.5CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR), 14.4 V clamping voltage (VC) at 10 A peak pulse current, and 500 W peak pulse power rating - ideal for safeguarding automotive sensor interfaces and industrial I/O circuits against ESD and inductive switching transients.
For engineers reviewing the SMA5J8.5CA-E3/5A datasheet, SMA5J8.5CA-E3/5A pinout, SMA5J8.5CA-E3/5A application, or SMA5J8.5CA-E3/5A equivalent, key selection criteria include bidirectional polarity, low clamping ratio (VC/VWM = 1.69), AEC-Q101 qualification eligibility, thermal resistance (RθJA = 80 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response time (<1 ns), critical for suppressing sub-microsecond transients per IEC 61000-4-2 and ISO 16750-2.
The device delivers 500 W peak pulse power (10/1000 μs waveform) with low incremental surge resistance, resulting in minimal voltage overshoot during high-current surges. Thermal design is supported by RθJL = 25 °C/W and operation up to TJ = +150 °C, making it suitable for under-hood automotive environments and industrial control cabinets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; sets safe operating margin for 9–12 V nominal systems. |
| VBR (min/max) | 9.44 V / 10.4 V at 1.0 mA - verified breakdown threshold defining turn-on consistency across production lots. |
| VC @ IPPM | 14.4 V at 10 A - clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 500 W - peak pulse power handling capacity; enables reliable suppression of high-energy transients without failure. |
| ID @ VWM | <1.0 μA - ultra-low leakage ensures negligible standby current draw in battery-powered sensor nodes. |
| TJ Range | −55 °C to +150 °C - extended temperature capability supports deployment in automotive engine compartments and industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking - bidirectional symmetry eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; voltage clamping occurs regardless of polarity - simplifies PCB layout for AC or floating lines. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation while transferring heat to copper pads; requires minimum 5.0 mm × 5.0 mm pad area per terminal for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential buses (e.g., CAN, RS-485) or AC signal paths without external polarity management. |
| 500 W peak pulse power | Withstands high-energy transients from inductive load switching (e.g., solenoid drivers) without degradation or thermal runaway. |
| Low clamping ratio (VC/VWM = 1.69) | Minimizes overvoltage exposure to downstream ICs - critical for protecting 3.3 V or 5 V logic inputs in mixed-voltage systems. |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive applications requiring validated reliability under temperature cycling, humidity, and vibration stress. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing ±100 V transients while maintaining signal integrity below 14.4 V. Use Value: Prevents sensor IC latch-up or damage during ISO 7637-2 Pulse 5a events, extending field reliability beyond 15-year vehicle lifetimes. | Use Scenario: Shielding 24 V PLC digital input channels from relay coil flyback and ESD events in factory automation panels. IC Role / Device Role / Timing Role: Fast-response voltage limiter diverting >10 A surge currents away from optocoupler input stages. Use Value: Eliminates need for discrete RC snubbers or additional series resistors, reducing BOM count and board space by 30%. |
| Consumer USB Port Protection | Telecom Line Interface |
Use Scenario: Safeguarding USB 2.0 D+/D− lines in portable medical devices against human-body-model ESD (±8 kV contact). IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp limiting line voltage to ≤14.4 V within <1 ns of transient onset. Use Value: Maintains signal rise/fall times <1 ns and preserves USB full-speed timing margins without data corruption. | Use Scenario: Protecting Ethernet PHY front-end transformers and magnetics from lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Primary surge diverter placed before common-mode chokes, clamping differential and common-mode transients simultaneously. Use Value: Achieves ITU-T K.20/21 compliance with single-device solution, reducing system-level test failures by 92% in field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J8.5CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and thermal performance. | Required for green manufacturing programs with halogen restrictions (e.g., IPC-1752A Level 2). | Select when environmental compliance mandates halogen-free materials without compromising surge rating or footprint. |
| SMA6J8.5CA-E3/5A | 600 W peak pulse power rating, same VWM/VC, larger thermal mass due to SMA6J (DO-214AB) package. | Preferred for higher-reliability industrial systems where derated 500 W margin is insufficient under sustained surge duty cycles. | Choose when long-term surge repetition (>1000 events) or elevated ambient temperatures (>105 °C) demand extra thermal headroom. |
Compared with SMA5J8.5CA-M3/5A and SMA6J8.5CA-E3/5A, the SMA5J8.5CA-E3/5A offers optimal balance of compact size, 500 W surge capability, and commercial-grade RoHS compliance - making it the default choice for cost-sensitive, space-constrained automotive and industrial designs where halogen content is unrestricted and thermal loads remain within specification limits.
Availability
SMA5J8.5CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and consumer USB port ESD mitigation requiring stable component supply and consistent parametric performance across production batches.
Supply support for SMA5J8.5CA-E3/5A 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 high-reliability, high-power-density solutions.
The SMA5J family is engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering industry-leading power density in the compact SMA package while meeting AEC-Q101 and RoHS requirements.
FAQ
What is the clamping voltage of the SMA5J8.5CA-E3/5A at its rated peak pulse current?
The SMA5J8.5CA-E3/5A has a maximum clamping voltage (VC) of 14.4 V at 10 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMA5J8.5CA-E3/5A maintains this clamping performance consistently across its operational temperature range of −55 °C to +150 °C.
Is the SMA5J8.5CA-E3/5A suitable for automotive applications?
Yes - the SMA5J8.5CA-E3/5A is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes (e.g., SMA5J8.5CAHE3_A/I). While the base SMA5J8.5CA-E3/5A is commercial-grade, its electrical specs, thermal robustness (TJ max = +150 °C), and construction (glass-passivated junction, MSL Level 1) align with automotive environmental demands. For certified use, specify the HE3 variant to ensure full qualification documentation and lot traceability.
How does the bidirectional nature of the SMA5J8.5CA-E3/5A affect PCB layout?
The SMA5J8.5CA-E3/5A has no polarity marking and functions identically in both directions, eliminating cathode/anode orientation constraints during placement. This allows symmetrical routing on differential pairs (e.g., CAN H/L) or AC-coupled lines without concern for terminal assignment. Layout only requires adherence to the recommended 5.0 mm × 5.0 mm copper pad per terminal for thermal performance - no silkscreen polarity indicators or asymmetric trace routing needed.
What is the maximum leakage current of the SMA5J8.5CA-E3/5A at its stand-off voltage?
The SMA5J8.5CA-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 8.5 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage remains stable across temperature and ensures minimal impact on high-impedance sensor bias networks or battery-operated circuits where quiescent current budgets are tight. Measured per ANSI/IEEE C62.35 standards.
Can the SMA5J8.5CA-E3/5A be used in place of a unidirectional TVS like SMA5J8.5A?
No - the SMA5J8.5CA-E3/5A is strictly bidirectional and cannot replace unidirectional types like SMA5J8.5A in DC-biased circuits requiring forward conduction (e.g., power rail clamping with cathode-to-rail configuration). Its symmetrical IV curve lacks forward voltage drop specification (VF is not defined), and using it in unidirectional roles may result in unintended conduction or inadequate clamping. Always match polarity type to circuit topology.
SMA5J8.5CA-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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):
- 34.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J8.5CA-E3/5A FAQ
1.How can I place an order for SMA5J8.5CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J8.5CA-E3/5A 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 SMA5J8.5CA-E3/5A reliable?
The price and inventory of SMA5J8.5CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J8.5CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J8.5CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J8.5CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J8.5CA-E3/5A?
SMA5J8.5CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J8.5CA-E3/5A 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 SMA5J8.5CA-E3/5A?
For technical support, including SMA5J8.5CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J8.5CA-E3/5A requirements.
6.How does Aetrix verify that SMA5J8.5CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J8.5CA-E3/5A 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 SMA5J8.5CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J8.5CA-E3/5A?
All SMA5J8.5CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J8.5CA-E3/5A, 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 SMA5J8.5CA-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J8.5CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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