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Vishay General Semiconductor - Diodes Division SMAJ85AHE3/5A
- Part No.:
- SMAJ85AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85AHE3/5A.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
SMAJ85AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 85 V standoff 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ85AHE3/5A datasheet, SMAJ85AHE3/5A pinout, SMAJ85AHE3/5A application, or SMAJ85AHE3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 85 V), then avalanches within picoseconds when transient voltage exceeds VBR, clamping the line to ≤137 V. Its glass-passivated junction ensures stable breakdown and long-term reliability under repetitive surge stress.
The device is rated for 40 A non-repetitive forward surge current (IFSM) and exhibits a thermal resistance of 120 °C/W (junction-to-ambient) on standard PCB pads. Its MSL Level 1 rating and matte tin-plated leads support lead-free reflow up to 260 °C peak per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before significant leakage begins; defines safe working range for protected circuit. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - precise avalanche onset range ensuring consistent clamping behavior across production lots. |
| VC @ IPPM | 137 V at 2.2 A - clamped voltage during 10/1000 μs transient; determines residual stress on downstream components. |
| PPPM | 400 W - peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 4 surges on 24 V/48 V systems. |
| IFSM | 40 A - single half-sine surge rating (8.3 ms); supports robustness against inductive switch-off events in motor drives. |
| TJ max | +150 °C - maximum junction temperature; allows operation in under-hood automotive environments and sealed industrial enclosures. |
| RθJA | 120 °C/W - thermal resistance on standard 0.2" × 0.2" copper pads; informs derating requirements above 25 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band marking on body; anode is unmarked end. Compliant with UL 94 V-0, MSL Level 1, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts avalanche current to ground or lower-potential rail during overvoltage event. |
| Anode (unbanded end) | Reference potential node | Typically tied to system ground or common return path; completes shunt conduction path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Enables protection against severe transients per ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during clamping - critical for safeguarding 100 V-rated MOSFETs and wide-VDS gate drivers. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over time and temperature - improves long-term BOM stability in field-deployed equipment. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking or special handling - reduces manufacturing cost and yield risk. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load-dump and inductive switching transients on 24 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed between power rail and chassis ground, responding within <1 ps to limit voltage excursion. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers exposed to ISO 7637-2 Pulse 5a (up to 60 V/100 ms). |
Use Scenario: Shields analog front-end inputs of pressure/temperature sensors in PLC I/O modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS connected between signal line and local ground, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity below 137 V clamp while adding <0.5 pF parasitic capacitance - no bandwidth degradation in 10 kHz sensor signals. |
| DC Motor Drive Gate Protection | Telecom Power Supply Input Protection |
|
Use Scenario: Protects high-side N-channel MOSFET gates from voltage spikes generated during PWM commutation in BLDC drivers. IC Role / Device Role / Timing Role: TVS placed between gate and source, clamping Miller-induced overshoot during turn-off transitions. Use Value: Limits gate-source voltage to ≤137 V, preventing oxide breakdown in 100 V-rated logic-level MOSFETs under 40 A inductive kickback. |
Use Scenario: Guards primary-side input of 48 V telecom rectifiers against lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: First-stage shunt protector on AC/DC input, coordinated with MOVs and gas discharge tubes for staged clamping. Use Value: Handles 400 W single-event surges per IEC 61643-11 Class II while maintaining <1 μA leakage at 85 V - avoids standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/5A | Commercial-grade version (non-AEC-Q101); identical electrical specs and package but not qualified for automotive use. | Limited to industrial/commercial designs where automotive qualification is not mandated. | Select when cost sensitivity outweighs automotive compliance requirements and lifecycle traceability is not required. |
| SMBJ85AHE3/5A | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 25 % larger footprint and 600 W PPPM rating. | Better suited for higher-energy transients or thermally constrained layouts requiring lower RθJA. | Choose when system-level surge testing exceeds 400 W or board space permits larger package for improved thermal margin. |
Compared with SMAJ85AHE3/5A, the commercial SMAJ85A-E3/5A offers identical clamping performance at lower cost but lacks automotive qualification evidence; the SMBJ85AHE3/5A delivers higher surge energy handling in a larger footprint - enabling longer transient duration immunity without thermal runaway.
Availability
SMAJ85AHE3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, DC motor gate drive safeguarding, telecom power supply input conditioning, and AEC-Q101-compliant embedded control systems requiring stable component supply across multi-year production cycles.
Supply support for SMAJ85AHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, 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 surges is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ85AHE3/5A under a 10/1000 μs surge?
The SMAJ85AHE3/5A has a maximum clamping voltage (VC) of 137 V at 2.2 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case clamping performance across temperature and process variation - critical for verifying safe operating margins of downstream 100 V-rated components in the SMAJ85AHE3/5A-protected circuit.
Is SMAJ85AHE3/5A suitable for automotive applications?
Yes, SMAJ85AHE3/5A is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per AEC standards - making it appropriate for engine control units, body electronics, ADAS camera modules, and infotainment power supplies where reliability under thermal and vibration stress is mandatory.
What is the standoff voltage (VWM) and why does it matter for SMAJ85AHE3/5A?
The SMAJ85AHE3/5A has a standoff voltage (VWM) of 85 V - the maximum DC or continuous reverse voltage the device can block without exceeding 1 μA leakage. This parameter ensures the SMAJ85AHE3/5A remains non-conductive during normal operation of 24 V or 48 V systems, avoiding power loss or false triggering while still providing headroom to reliably clamp transients above 94.4 V breakdown threshold.
How does the thermal resistance of SMAJ85AHE3/5A affect its surge handling capability?
The SMAJ85AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads. This directly limits its ability to absorb repetitive surges: at ambient temperatures above 25 °C, derating per Figure 2 in the datasheet applies - e.g., at 85 °C ambient, its 400 W peak pulse rating drops to ~240 W. Proper PCB copper area and layout are essential to maintain SMAJ85AHE3/5A's specified surge performance.
What packaging and reel options are available for SMAJ85AHE3/5A?
SMAJ85AHE3/5A is supplied in 13" diameter plastic tape and reel with a base quantity of 7500 units per reel (package code "5A"). The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets MSL Level 1 for moisture sensitivity - enabling standard lead-free reflow without baking. Traceability is ensured through Vishay's lot-code marking and RoHS-compliant material declaration.
SMAJ85AHE3/5A 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:
- 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)
SMAJ85AHE3/5A FAQ
1.How can I place an order for SMAJ85AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85AHE3/5A 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 SMAJ85AHE3/5A reliable?
The price and inventory of SMAJ85AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ85AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85AHE3/5A?
SMAJ85AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85AHE3/5A 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 SMAJ85AHE3/5A?
For technical support, including SMAJ85AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85AHE3/5A requirements.
6.How does Aetrix verify that SMAJ85AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ85AHE3/5A 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 SMAJ85AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ85AHE3/5A?
All SMAJ85AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85AHE3/5A, 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 SMAJ85AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ85AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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