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Vishay General Semiconductor - Diodes Division SMAJ85AHE3_A/H
- Part No.:
- SMAJ85AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85AHE3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
SMAJ85AHE3_A/H from Vishay General Semiconductor is a unidirectional 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ85AHE3_A/H datasheet, SMAJ85AHE3_A/H pinout, SMAJ85AHE3_A/H application, or SMAJ85AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (–55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, limiting transient energy to safe levels for downstream circuitry. Its glass-passivated junction ensures stable leakage performance, while the SMA package supports automated SMT placement and meets MSL level 1 reflow requirements (260 °C peak).
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above 78 V per Fig. 2; it exhibits low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes in DC power rails and I/O lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - guaranteed avalanche onset window; ensures consistent turn-on across production lots. |
| VC @ IPPM | 137 V at 2.2 A - clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream components. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak transient energy absorption capability; defines survivability under standardized surge waveforms. |
| ID @ VWM | 1.0 μA - reverse leakage at rated stand-off voltage; low value minimizes standby power loss and avoids false triggering. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; forms forward-biased path during positive transients on cathode-referenced rails. |
| Cathode | Avalanche conduction terminal | Connected to higher-potential side (e.g., VBUS); conducts reverse surge current when VAK > VBR, clamping voltage to VC. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, body electronics, and ADAS power domains. |
| Glass passivated junction | Stable VBR tolerance and low ID drift over temperature and lifetime - critical for long-term protection integrity in sealed enclosures. |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak - eliminates pre-baking requirements and supports high-yield automated assembly. |
| UL 497B recognized | Classified as surge protector under Underwriters Laboratories standard QVGQ2 (E136766) - satisfies safety certification requirements for end equipment. |
| Low profile SMA package | 5.28 mm × 4.50 mm footprint with 2.29 mm height - enables compact layout in space-constrained PCBs without sacrificing surge rating. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping transients before they reach LDOs and microcontrollers. Use Value: Withstands 400 W pulses and operates up to +150 °C, meeting AEC-Q101 requirements for under-hood deployment. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) TVS mounted directly at connector entry point to minimize trace inductance and preserve signal fidelity. Use Value: 137 V clamping voltage limits stress on 16-bit ADC front-ends and instrumentation amplifiers without compromising accuracy. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding buck converter inputs in PoE-powered devices exposed to Ethernet-coupled surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary clamping element upstream of input filter capacitor, absorbing energy before it reaches switching FETs and controllers. Use Value: 2.2 A peak pulse current rating and 120 °C/W RθJA enable reliable operation with minimal heatsinking in enclosed power modules. |
Use Scenario: Front-end protection for DSL or POTS line interface circuits subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Unidirectional TVS configured in series with gas discharge tube (GDT) for hybrid primary/secondary protection architecture. Use Value: UL 497B recognition and 300–400 W PPPM support compliance with GR-1089-CORE and ITU-T K.20/K.21 standards. |
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-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; not approved for use in AEC-Q101-mandated vehicle subsystems. | Select when cost-sensitive industrial or consumer designs do not require automotive reliability validation. |
| SMAJ85AHM3_A/H | Halogen-free, RoHS-compliant, and AEC-Q101 qualified; identical VWM, VBR, VC, and PPPM ratings. | Same automotive suitability; differs only in halogen-free molding compound per JEDEC J-STD-020. | Choose when halogen-free compliance is required for environmental regulatory alignment (e.g., EU RoHS Annex II). |
Compared with SMAJ85A-E3/61 and SMAJ85AHM3_A/H, the SMAJ85AHE3_A/H provides AEC-Q101 qualification and standard RoHS compliance in a single package variant - making it the default choice for automotive OEMs requiring both reliability validation and regulatory conformity without halogen restrictions.
Availability
SMAJ85AHE3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, DC-DC converter input safeguarding, and telecom line card surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ85AHE3_A/H 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, TVS devices, and optoelectronics with emphasis on high-reliability, high-efficiency solutions.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMAJ85AHE3_A/H at its rated peak pulse current?
The SMAJ85AHE3_A/H has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 2.2 A, measured using the 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMAJ85AHE3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMAJ85AHE3_A/H qualified for automotive applications?
Yes, SMAJ85AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in the 88390 datasheet. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its suitability for automotive powertrain, chassis, and body electronics. The SMAJ85AHE3_A/H is explicitly designated for automotive use in Vishay's ordering information table.
What is the thermal resistance of SMAJ85AHE3_A/H, and how does it affect layout design?
The SMAJ85AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes standard PCB copper area and influences thermal management decisions: for repetitive surge conditions, designers must ensure average power dissipation stays below 3.3 W and consider additional copper pour or thermal vias if ambient temperatures exceed 70 °C. The SMAJ85AHE3_A/H's RθJL of 30 °C/W further supports efficient heat transfer to PCB traces.
Does SMAJ85AHE3_A/H meet UL safety standards?
Yes, SMAJ85AHE3_A/H is Underwriters Laboratory (UL) recognized under standard UL 497B for surge protectors, with file number E136766. This classification applies to both unidirectional and bidirectional variants in the SMAJ family and confirms compliance for use in end-equipment safety certifications. The UL listing covers construction, flammability (UL 94 V-0), and electrical performance - all verified for the SMAJ85AHE3_A/H variant.
What is the reverse leakage current of SMAJ85AHE3_A/H at its stand-off voltage?
The SMAJ85AHE3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 85 V and TA = 25 °C. This low leakage ensures minimal power loss in always-on systems and prevents false triggering or interference with high-impedance sensing nodes. Leakage remains within specification across the full operating temperature range (–55 to +150 °C), supporting stable performance in thermally demanding applications.
SMAJ85AHE3_A/H 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:
- -
- 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_A/H FAQ
1.How can I place an order for SMAJ85AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85AHE3_A/H 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_A/H reliable?
The price and inventory of SMAJ85AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ85AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85AHE3_A/H?
SMAJ85AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85AHE3_A/H 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_A/H?
For technical support, including SMAJ85AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ85AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ85AHE3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ85AHE3_A/H?
All SMAJ85AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85AHE3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMAJ85AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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