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Vishay General Semiconductor - Diodes Division SMAJ8.5AHE3/61
- Part No.:
- SMAJ8.5AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5AHE3/61.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,140
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Product details
Overview
SMAJ8.5AHE3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 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), commonly deployed to protect MOSFET gates and sensor interfaces in automotive ECUs.
For engineers reviewing the SMAJ8.5AHE3/61 datasheet, SMAJ8.5AHE3/61 pinout, SMAJ8.5AHE3/61 application, or SMAJ8.5AHE3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1.0 μA max reverse leakage at VWM, thermal resistance of 120 °C/W (junction-to-ambient), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting surge energy away from downstream ICs. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance, while the SMA package supports high-current pulse handling without thermal runaway under repetitive 0.01% duty cycle conditions.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and delivers sub-nanosecond response time to transients - critical for safeguarding sensitive analog front-ends and microcontroller I/O pins against ISO 7637-2 and IEC 61000-4-5 threats.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for safe DC bias on protected line. |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown range defining turn-on threshold; tight 10.4 % tolerance enables predictable clamping onset. |
| VC @ IPPM | 14.4 V at 27.8 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream circuitry. |
| PPPM | 400 W - Peak pulse power rating; defines maximum transient energy absorption capability under standard test waveform. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; low value minimizes quiescent power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs PCB copper pad design requirements for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance reference; completes clamping loop during transient events. |
| Cathode | Reverse-biased terminal / Protected line connection | Connected to the line being protected (e.g., 12 V rail or sensor output); avalanche conduction initiates here when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and surge endurance - required for ECU, ADAS, and body control modules. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 2 Ω source) and IEC 61000-4-5 Combination Wave (0.5/100 μs) surges without degradation. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to moisture ingress or metallization migration. |
| MSL Level 1 | Compatible with standard lead-free reflow profiles up to 260 °C peak, eliminating bake-out requirements prior to assembly. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with higher-voltage domains. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to +35 V, 400 ms) and inductive switching spikes on 12 V battery-fed MCU power rails in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between VCC and GND, activated within <1 ns upon overvoltage detection. Use Value: Limits rail voltage to ≤14.4 V during 27.8 A surge, preventing latch-up or gate oxide damage in automotive-qualified MCUs such as Infineon AURIX™ or NXP S32K series. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to PLC analog input modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-mode protector on 4–20 mA current loop or 0–10 V output line, conducting only during transient excursions beyond 8.5 V. Use Value: Maintains signal integrity by limiting reverse leakage to 1.0 μA at 8.5 V, avoiding offset errors while clamping 1 kV/1.2–50 μs transients to safe levels. |
| Consumer USB Port ESD Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on VBUS line of USB 2.0 ports in set-top boxes and smart displays subjected to ±8 kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Fast-response clamping diode placed upstream of USB power switch, absorbing ESD energy before it reaches load switches or PMICs. Use Value: Achieves sub-ns response with 14.4 V clamping, ensuring downstream USB controllers (e.g., Microchip USB2514B) remain within absolute maximum ratings during ESD events. |
Use Scenario: Front-end surge suppression on POTS line interface circuits in VoIP gateways and DSLAM line cards facing lightning-induced surges per ITU-T K.20/K.44. IC Role / Device Role / Timing Role: Primary overvoltage clamp on tip/ring pair, coordinated with gas discharge tube (GDT) for staged protection architecture. Use Value: Provides precise 8.5 V standoff and 14.4 V clamping to prevent premature triggering of secondary protectors while handling 400 W short-duration surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-E3/61 | Same electrical specs and SMA package, but commercial-grade (non-AEC-Q101); RoHS-compliant, no halogen restriction. | Lacks automotive qualification; suitable for consumer/industrial designs where AEC-Q101 is not mandated. | Select SMAJ8.5AHE3/61 when automotive compliance, extended temperature validation, or long-term supply assurance is required. |
| SMBJ8.5AHE3/61 | Same VWM/VBR/VC specs, but SMB (DO-214AA) package - 30 % larger footprint and 50 % higher PPPM (600 W). | Higher surge margin and better thermal dissipation; requires larger PCB area and different pad layout. | Choose SMBJ8.5AHE3/61 if system-level surge tests exceed 400 W or board space allows larger package for enhanced robustness. |
Compared with SMAJ8.5A-E3/61, SMAJ8.5AHE3/61 adds AEC-Q101 qualification and tighter process controls for automotive use; versus SMBJ8.5AHE3/61, it trades 200 W lower surge rating for 30 % smaller footprint and identical mounting compatibility with high-density layouts.
Availability
SMAJ8.5AHE3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and consumer power interface designs requiring stable component supply, AEC-Q101 traceability, and consistent surge performance across production batches.
Supply support for SMAJ8.5AHE3/61 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, precision, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching is non-negotiable.
FAQ
What is the clamping voltage of SMAJ8.5AHE3/61 at its rated peak pulse current?
The SMAJ8.5AHE3/61 has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current (IPPM) of 27.8 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value defines the highest voltage seen by downstream components during worst-case transient events and is confirmed in Vishay's datasheet revision 09-Jan-2024, page 2. The SMAJ8.5AHE3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ8.5AHE3/61 suitable for automotive applications?
Yes, SMAJ8.5AHE3/61 is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet footnote (page 3) and ordering information section. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and surge endurance validation specifically for automotive under-hood and cabin environments. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, making SMAJ8.5AHE3/61 appropriate for engine control units, ADAS camera modules, and body electronics where automotive-grade reliability is mandatory.
What is the reverse leakage current specification for SMAJ8.5AHE3/61 at its stand-off voltage?
The SMAJ8.5AHE3/61 specifies a maximum reverse leakage current (ID) of 1.0 μA at its stand-off voltage (VWM) of 8.5 V, tested at TA = 25 °C. This low leakage ensures minimal impact on power budget and signal accuracy in always-on or low-power circuits such as battery-backed sensor nodes or automotive wake-up receivers. The value is documented in the Electrical Characteristics table (page 2) of the Vishay datasheet 88390, under the "MAXIMUM REVERSE LEAKAGE AT VWM" column for device SMAJ8.5A.
Does SMAJ8.5AHE3/61 have polarity marking, and how is it identified?
Yes, SMAJ8.5AHE3/61 is a unidirectional TVS diode and features a visible cathode band on the SMA (DO-214AC) package body - a black or dark-colored stripe located near one end. Per Vishay's mechanical data (page 5), this band identifies the cathode terminal, which must be connected to the line being protected (e.g., 12 V rail), while the anode connects to ground. Bidirectional variants (e.g., SMAJ8.5CA) omit this marking; the presence of the band confirms unidirectional functionality for SMAJ8.5AHE3/61.
What is the thermal resistance and recommended PCB layout for SMAJ8.5AHE3/61?
The SMAJ8.5AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the "Maximum Ratings" table (page 1) and "Ratings and Characteristics Curves" (page 4). To maintain reliability under repetitive surge conditions, designers should adhere to this pad size and ensure adequate copper pour connectivity to minimize thermal impedance. The device's RθJL is 30 °C/W, indicating efficient heat transfer to PCB traces.
SMAJ8.5AHE3/61 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:
- 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):
- 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)
SMAJ8.5AHE3/61 FAQ
1.How can I place an order for SMAJ8.5AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5AHE3/61 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 SMAJ8.5AHE3/61 reliable?
The price and inventory of SMAJ8.5AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5AHE3/61?
SMAJ8.5AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5AHE3/61 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 SMAJ8.5AHE3/61?
For technical support, including SMAJ8.5AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5AHE3/61 requirements.
6.How does Aetrix verify that SMAJ8.5AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5AHE3/61 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 SMAJ8.5AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5AHE3/61?
All SMAJ8.5AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5AHE3/61, 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 SMAJ8.5AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ8.5AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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