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Vishay General Semiconductor - Diodes Division SMAJ85A-E3/5A
- Part No.:
- SMAJ85A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85A-E3/5A.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,859
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Product details
Overview
SMAJ85A-E3/5A 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 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, and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ85A-E3/5A datasheet, SMAJ85A-E3/5A pinout, SMAJ85A-E3/5A application, or SMAJ85A-E3/5A equivalent, key selection criteria include unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, RoHS-compliant matte tin-plated leads, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>1 μA leakage at 85 V), then avalanches within <1 ns to clamp transient overvoltages. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling consistent clamping performance across repetitive 10/1000 μs surges at 0.01% duty cycle.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 30 °C/W junction-to-lead. It meets UL 497B recognition (QVGQ2) and is RoHS-compliant per base P/N-E3 designation - no halogen-free or AEC-Q101 qualification unless specified by HE3/HM3 suffixes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 94.4–104 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transients without premature conduction |
| VC (Clamping Voltage) | 137 V at IPPM = 2.2 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standardized 10/1000 μs waveform; derates to 300 W above 78 V |
| IFSM (Surge Current) | 40 A - Single half-sine 8.3 ms forward surge rating (unidirectional only); validates robustness against inrush or fault currents |
| TJmax | +150 °C - Maximum junction temperature; enables operation in high-ambient environments like motor drives or automotive under-hood modules |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on 0.2" × 0.2" copper pads; informs PCB thermal design requirements |
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; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or lower-potential rail; completes clamping loop during reverse-biased surge events |
| Cathode | Protected line connection / transient sensing node | Connected to line being protected (e.g., 85 V supply rail); avalanche conduction occurs when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating in compact layouts |
| 137 V clamping at 2.2 A | Limits voltage overshoot to ≤61% above VWM, preserving margin for 100 V-rated downstream MOSFETs or controllers |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without preconditioning; eliminates moisture-related popcorning risk |
| Glass passivated junction | Ensures stable VBR tolerance (<±5%) and low leakage (<1 μA at VWM) over 10-year field life |
| UL 497B recognized (QVGQ2) | Validates compliance for telecom and industrial equipment safety certifications without additional system-level testing |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O lines against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional shunt clamping device placed between 12 V/24 V supply rail and ground, triggered within <1 ns of overvoltage event. Use Value: Limits transient voltage to 137 V, preventing latch-up or oxide rupture in 3.3 V/5 V logic interfaces powered from switched DC rails. |
Use Scenario: Surge suppression on LIN bus lines and sensor inputs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standby-mode protector with <1 μA leakage at 12 V, activated only during >85 V transients such as battery jump-start spikes. Use Value: Maintains signal integrity on 19.2 kbps LIN networks while surviving 100 V/50 ms load dump pulses per ISO 16750-2. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for AC-DC adapters and PoE injectors subjected to lightning-induced surges on primary-side DC bus. IC Role / Device Role / Timing Role: Primary-side TVS connected across bulk capacitor terminals, absorbing up to 400 W of transient energy. Use Value: Prevents catastrophic failure of 100 V-rated electrolytic capacitors and bridge rectifiers during 1.2/50 μs open-circuit surges. |
Use Scenario: ESD and switching transient protection on microcontroller GPIOs controlling relays, displays, and touch panels. IC Role / Device Role / Timing Role: Localized point-of-use suppressor mounted directly at connector or switch input, minimizing trace inductance. Use Value: Clamps 8 kV HBM ESD events to <137 V within 1 ns, eliminating firmware resets and display ghosting in white-goods HMI systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package | Required for consumer electronics targeting IEC 61249-2-21 or JEDEC J-STD-609A Class 2a material declarations | Select when halogen-free compliance is mandated by OEM environmental policy or regional regulations |
| SMAJ85AHE3_A/I | AEC-Q101 qualified version with same VWM/VC/PPPM, but enhanced reliability screening and extended temperature validation | Approved for automotive powertrain and chassis applications requiring PPAP documentation and zero-defect field performance | Choose for under-hood or ADAS subsystems where qualification to automotive stress test standards is mandatory |
Compared with SMAJ85A-E3/5A, the M3/5A offers identical protection performance with halogen-free materials, while the HE3_A/I adds AEC-Q101 qualification for automotive use - neither is pin-compatible drop-in replacements unless explicitly designated by suffix; all share SMA (DO-214AC) footprint and unidirectional polarity.
Availability
SMAJ85A-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ85A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - optimized for fast response, stable clamping, and compatibility with automated SMT manufacturing across industrial, automotive, and telecom end markets.
FAQ
What is the maximum clamping voltage of SMAJ85A-E3/5A under a 10/1000 μs surge?
The SMAJ85A-E3/5A 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 confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88390. The clamping performance ensures protected circuits remain within safe voltage margins during surge events.
Is SMAJ85A-E3/5A suitable for automotive applications?
SMAJ85A-E3/5A is RoHS-compliant and MSL Level 1 qualified but not AEC-Q101 certified. For non-safety-critical automotive applications like infotainment or lighting modules, it may be used with customer validation. However, for body control, powertrain, or ADAS systems, the AEC-Q101-qualified variant SMAJ85AHE3_A/I is required - SMAJ85A-E3/5A itself does not carry automotive qualification.
What is the thermal resistance of SMAJ85A-E3/5A, and how does it affect PCB layout?
SMAJ85A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's DO-214AC outline. To maintain TJ ≤ 150 °C, PCB layout must provide adequate copper area and avoid thermal bottlenecks - insufficient copper increases RθJA and risks thermal runaway during repetitive surges.
Does SMAJ85A-E3/5A have bidirectional capability?
No, SMAJ85A-E3/5A is strictly unidirectional. Its marking code "RV" and cathode band confirm polarity-sensitive operation. Bidirectional variants carry "CA" suffix (e.g., SMAJ85CA). Using SMAJ85A-E3/5A in bidirectional signal paths would result in forward conduction during negative transients - always verify polarity alignment in schematic and layout to ensure correct anode/cathode orientation relative to the protected line.
What is the leakage current specification for SMAJ85A-E3/5A at its stand-off voltage?
At VWM = 85 V and TA = 25 °C, SMAJ85A-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage ensures minimal power loss in standby mode and avoids false triggering in high-impedance sensor or communication circuits. Leakage remains within specification up to +125 °C, per thermal derating curves in the datasheet.
SMAJ85A-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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ85A-E3/5A FAQ
1.How can I place an order for SMAJ85A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85A-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 SMAJ85A-E3/5A reliable?
The price and inventory of SMAJ85A-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 SMAJ85A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ85A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85A-E3/5A?
SMAJ85A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85A-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 SMAJ85A-E3/5A?
For technical support, including SMAJ85A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85A-E3/5A requirements.
6.How does Aetrix verify that SMAJ85A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ85A-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 SMAJ85A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ85A-E3/5A?
All SMAJ85A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85A-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 SMAJ85A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ85A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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