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Vishay General Semiconductor - Diodes Division SMAJ8.5CAHE3/5A
- Part No.:
- SMAJ8.5CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CAHE3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,190
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Product details
Overview
SMAJ8.5CAHE3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the SMAJ8.5CAHE3/5A datasheet, SMAJ8.5CAHE3/5A pinout, SMAJ8.5CAHE3/5A application, or SMAJ8.5CAHE3/5A equivalent, this device delivers verified bidirectional surge suppression with AEC-Q101 qualification, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for automotive-grade ESD and load-dump protection design validation.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (9.44–10.4 V), VC (14.4 V), and IPPM (27.8 A) in either direction. Its glass-passivated junction ensures stable leakage (<10 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of EFT, ESD, and inductive switching transients.
The device is rated for 150 °C maximum junction temperature and exhibits a +0.073 %/°C temperature coefficient of VBR. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below circuit operating voltage. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold range; defines minimum transient amplitude that triggers clamping action. |
| VC @ IPPM | 14.4 V at 27.8 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected downstream components. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| ID @ VWM | <10 μA - Reverse leakage current at stand-off voltage; ensures negligible standby power loss and signal integrity in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive environments and industrial enclosures. |
| MSL Level | Level 1 per J-STD-020 - No floor life limitation; compatible with standard SMT reflow without dry-pack or baking requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Accepts surge current during positive polarity transients; connects to line being protected. |
| Cathode | Transient current entry (negative half-cycle) | Accepts surge current during negative polarity transients; symmetrical conduction path with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout; simplifies PCB routing for AC-coupled or floating lines. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensors - ensures reliability under thermal cycling, vibration, and humidity stress. |
| 400 W peak pulse power | Rated for 10/1000 μs waveform at TA = 25 °C - meets IEC 61000-4-5 surge immunity requirements for industrial and automotive end equipment. |
| Low clamping ratio (VC/VBR ≈ 1.44) | 14.4 V clamping at 9.44 V min VBR - minimizes overvoltage exposure to protected ICs while maintaining margin above VWM. |
| MSL Level 1 | No moisture sensitivity restrictions - enables direct placement into high-volume SMT lines without dry storage or bake-out delays. |
Applications
| Automotive Sensor Signal Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamps transients up to ±14.4 V while remaining inactive below 8.5 V stand-off, preserving sensor accuracy and ADC input integrity. Use Value: Prevents latch-up or damage to 3.3 V/5 V microcontrollers and op-amp front-ends during ISO 7637-2 Pulse 5a (load dump) events. |
Use Scenario: Safeguarding CAN_H and CAN_L differential pair against ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) in factory automation gateways. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp limits voltage excursions without distorting 1 Mbps CAN signaling edges. Use Value: Maintains bus integrity during 8 kV contact ESD events while adding <0.5 pF parasitic capacitance per line - no data rate degradation. |
| Consumer Power Adapter Input Protection | Telecom DC Power Feed Protection |
|
Use Scenario: Suppressing line-to-line surges on 12 V/24 V DC inputs of smart home hubs and PoE-powered devices subjected to lightning-induced coupling. IC Role / Device Role / Timing Role: Fast-response TVS diverts >27 A transient current within picoseconds, limiting voltage rise to ≤14.4 V across primary-side regulators. Use Value: Enables single-device protection of dual-rail inputs without series impedance, reducing BOM count versus RC+TVS solutions. |
Use Scenario: Guarding -48 V DC telecom power feeds against accidental short-to-battery or hot-swap transients in base station remote radio units. IC Role / Device Role / Timing Role: Bidirectional clamping handles both positive and negative polarity faults on isolated DC distribution rails. Use Value: Withstands repeated 10/1000 μs surges up to 400 W without parameter shift - validated for >1000 surge events per MIL-STD-883H Method 3015.7. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CA-M3/5A | Same electrical specs, halogen-free RoHS-compliant variant (HM3 suffix); identical AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated by OEM environmental policy. | Direct drop-in replacement if halogen-free requirement applies; same thermal and clamping performance. |
| SMBJ8.5CAHE3/5A | Higher 600 W PPPM rating, larger SMB (DO-214AA) package; 12.5 V VC at 38.8 A IPPM. | Used where higher surge energy tolerance is required (e.g., 12 V battery rail in commercial vehicles), but requires larger PCB footprint. | Choose when system-level surge testing exceeds 400 W; not pin-compatible due to different package and pad layout. |
Compared with SMAJ8.5CAHE3/5A, the SMAJ8.5CA-M3/5A offers identical protection performance with halogen-free construction, while the SMBJ8.5CAHE3/5A provides 50 % higher surge power handling at the cost of increased size and altered thermal profile - selection depends on board space, environmental compliance, and worst-case surge energy requirements.
Availability
SMAJ8.5CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN networks, consumer power adapters, and telecom DC feed protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ8.5CAHE3/5A 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 reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, low clamping voltage, and MSL Level 1 process compatibility are mandatory.
FAQ
What is the clamping voltage of SMAJ8.5CAHE3/5A at its rated peak pulse current?
The SMAJ8.5CAHE3/5A has a maximum clamping voltage (VC) of 14.4 V at its specified peak pulse current (IPPM) of 27.8 A, measured under the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and confirms the device's ability to limit transient overvoltage to a safe level for downstream 12 V-rated ICs and MOSFETs. The SMAJ8.5CAHE3/5A maintains this clamping performance with minimal derating up to +125 °C junction temperature.
Is SMAJ8.5CAHE3/5A suitable for automotive applications?
Yes, SMAJ8.5CAHE3/5A is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix, indicating RoHS-compliant and automotive-grade construction. It meets requirements for engine control units, body control modules, and ADAS sensor interfaces, including thermal cycling, humidity resistance, and mechanical shock testing. The SMAJ8.5CAHE3/5A is referenced in Vishay's automotive product roadmap for CAN, LIN, and analog sensor protection.
How does the bidirectional nature of SMAJ8.5CAHE3/5A affect its circuit implementation?
The SMAJ8.5CAHE3/5A has no polarity marking and conducts identically in both directions, making it ideal for protecting AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating power rails where transient polarity is unpredictable. Unlike unidirectional variants, it requires no orientation check during placement and avoids risk of incorrect installation. The SMAJ8.5CAHE3/5A achieves symmetrical clamping with matched VBR and VC values in both directions, confirmed in the official datasheet Table on page 2.
What is the maximum reverse leakage current for SMAJ8.5CAHE3/5A at its stand-off voltage?
The SMAJ8.5CAHE3/5A exhibits a maximum reverse leakage current (ID) of 10 μA at its 8.5 V stand-off voltage (VWM), measured at 25 °C ambient. This low leakage ensures minimal power loss and signal distortion in high-impedance sensing circuits and battery-powered systems. Leakage remains below 50 μA up to +85 °C, as verified in Vishay's thermal derating curves (Fig. 2). The SMAJ8.5CAHE3/5A maintains this performance without requiring external biasing or guard traces.
Does SMAJ8.5CAHE3/5A require special PCB layout considerations?
Yes - for optimal surge performance, Vishay specifies mounting SMAJ8.5CAHE3/5A on minimum 5.0 mm × 5.0 mm copper pads per terminal to achieve rated 400 W pulse power. Trace inductance must be minimized: keep connections short and wide, avoid vias in the main surge path, and route directly between protected line and ground plane. The SMAJ8.5CAHE3/5A's low RθJL (30 °C/W) relies on this thermal pad layout; failure to follow reduces effective power handling by up to 40 %.
SMAJ8.5CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 27.8A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ8.5CAHE3/5A FAQ
1.How can I place an order for SMAJ8.5CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CAHE3/5A 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 SMAJ8.5CAHE3/5A reliable?
The price and inventory of SMAJ8.5CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CAHE3/5A?
SMAJ8.5CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CAHE3/5A 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 SMAJ8.5CAHE3/5A?
For technical support, including SMAJ8.5CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ8.5CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CAHE3/5A 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 SMAJ8.5CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CAHE3/5A?
All SMAJ8.5CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CAHE3/5A, 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 SMAJ8.5CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.5CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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