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Vishay General Semiconductor - Diodes Division SMAJ85AHE3/61
- Part No.:
- SMAJ85AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85AHE3/61.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,140
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Product details
Overview
SMAJ85AHE3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 2.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ85AHE3/61 datasheet, SMAJ85AHE3/61 pinout, SMAJ85AHE3/61 application, or SMAJ85AHE3/61 equivalent, key selection considerations include its AEC-Q101 qualification, unidirectional polarity with cathode band marking, low incremental surge resistance, and suitability for automotive power line and sensor interface protection where fast response (<1 ns), stable clamping, and MSL Level 1 reflow compatibility are required.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, entering avalanche conduction when reverse voltage exceeds VBR to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable leakage performance and long-term reliability under repetitive surge stress.
The device is rated for 40 A peak forward surge current (IFSM) and supports continuous power dissipation of 3.3 W at 50 °C ambient on infinite heatsink. Thermal resistance from junction to ambient is 120 °C/W, and junction-to-lead is 30 °C/W - critical for thermal design in compact automotive and industrial PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 94.4 V / 104 V at 1 mA - defines reliable avalanche onset range for design margining |
| VC @ IPPM | 137 V at 2.2 A - clamping voltage during 10/1000 μs transient, limiting stress on protected ICs |
| PPPM | 400 W - peak pulse power handling capability per standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage ensures minimal standby power loss |
| TJ max | +150 °C - enables operation in under-hood automotive environments |
| MSL Level | Level 1 (J-STD-020) - supports lead-free reflow up to 260 °C peak without preconditioning |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; forms shunt path during overvoltage |
| Cathode | Reverse-biased terminal / protected line connection | Connected to signal/power line being protected; avalanche conduction initiates here above VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| 400 W peak pulse power | Robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surge events |
| Fast response time < 1 ns | Clamps transients before they propagate into sensitive analog or digital ICs |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during surge, reducing risk of downstream component failure |
| MSL Level 1 rating | Enables direct placement into high-volume SMT lines without baking or special handling |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role: Shunt TVS placed between power rail and ground to clamp spikes exceeding 85 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during ISO 16750-2 load dump events. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC inputs. IC Role / Device Role: Unidirectional TVS on signal line to suppress ESD and inductive kickback from solenoid drivers. Use Value: Maintains signal integrity and prevents false readings or ADC saturation during 4 kV contact ESD (IEC 61000-4-2). |
| Consumer Device USB Port Protection | Telecom Line Card Surge Protection |
Use Scenario: Adding secondary overvoltage protection on VBUS line of USB-C ports in portable chargers. IC Role / Device Role: Standoff-rated TVS placed upstream of USB power switch to absorb 10/1000 μs surges. Use Value: Complements internal OVP circuits by handling higher-energy transients beyond IC-level protection limits. | Use Scenario: Front-end protection for Ethernet PHY power rails in DSLAM line cards exposed to lightning-induced surges. IC Role / Device Role: Primary shunt suppressor on +3.3 V or +5 V supply feeding PHY ICs. Use Value: Limits clamping voltage to 137 V while sustaining 400 W pulses, preserving PHY functionality after repeated surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/61 | Commercial-grade version; not AEC-Q101 qualified; same electrical specs and package | Lacks automotive qualification; unsuitable for OEM vehicle production | Select SMAJ85AHE3/61 when AEC-Q101 compliance is mandatory for automotive Tier 1 programs. |
| SMBJ85AHE3/61 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating | Higher power handling but requires 30% more board area; different thermal profile | Choose SMBJ85AHE3/61 only if system-level surge testing exceeds 400 W or thermal derating demands lower RθJA. |
Compared with SMAJ85A-E3/61, the SMAJ85AHE3/61 adds AEC-Q101 qualification without altering electrical behavior - essential for automotive deployment. Against SMBJ85AHE3/61, it trades 200 W extra pulse power for 35% smaller footprint and tighter layout constraints in space-constrained modules.
Availability
SMAJ85AHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom line card designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ85AHE3/61 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 automotive-grade validation.
The SMAJ series targets cost-sensitive, high-volume transient protection needs across automotive, industrial, and consumer markets - engineered for robustness in harsh environments and compatibility with automated SMT assembly.
FAQ
What is the clamping voltage of SMAJ85AHE3/61 at its rated peak pulse current?
The SMAJ85AHE3/61 has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 2.2 A, measured using the standardized 10/1000 μs waveform. This value ensures predictable overvoltage limiting during surge events and is verified per ANSI/IEEE C62.35. The clamping performance remains stable across temperature due to its low VBR temperature coefficient of 0.106 %/°C.
Is SMAJ85AHE3/61 suitable for automotive applications?
Yes, SMAJ85AHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It meets stringent requirements for temperature cycling, humidity resistance, and surge endurance in engine control, body electronics, and ADAS subsystems. Its MSL Level 1 rating and RoHS-compliant construction further support automotive manufacturing flow compatibility.
How does the SMAJ85AHE3/61 differ from bidirectional variants like SMAJ85CA?
The SMAJ85AHE3/61 is unidirectional and features a cathode band marking, intended for DC line protection where polarity is fixed. In contrast, SMAJ85CA is bidirectional with no polarity marking and symmetric breakdown in both directions - used in AC-coupled or floating signal lines. Their VBR, VC, and PPPM values are identical, but circuit integration differs significantly due to polarity dependence.
What is the maximum operating junction temperature for SMAJ85AHE3/61?
The SMAJ85AHE3/61 has a maximum operating junction temperature (TJ max) of +150 °C, enabling reliable operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. This rating is supported by its thermal resistance characteristics: RθJA = 120 °C/W and RθJL = 30 °C/W, allowing accurate thermal modeling for PCB pad layout optimization.
Does SMAJ85AHE3/61 require special handling during PCB assembly?
No - SMAJ85AHE3/61 is rated MSL Level 1 per J-STD-020 and supports standard lead-free reflow profiles with a maximum peak temperature of 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, eliminating need for baking, dry pack, or special storage. The SMA (DO-214AC) package is optimized for high-speed pick-and-place and yields excellent solder joint reliability.
SMAJ85AHE3/61 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 300W
- 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)
SMAJ85AHE3/61 FAQ
1.How can I place an order for SMAJ85AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85AHE3/61 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 SMAJ85AHE3/61 reliable?
The price and inventory of SMAJ85AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ85AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85AHE3/61?
SMAJ85AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85AHE3/61 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 SMAJ85AHE3/61?
For technical support, including SMAJ85AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85AHE3/61 requirements.
6.How does Aetrix verify that SMAJ85AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ85AHE3/61 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 SMAJ85AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ85AHE3/61?
All SMAJ85AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85AHE3/61, 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 SMAJ85AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ85AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85AHE3/61 Tags
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