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Vishay General Semiconductor - Diodes Division SMAJ85CAHE3/61
- Part No.:
- SMAJ85CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CAHE3/61.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,159
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Product details
Overview
SMAJ85CAHE3/61 from Vishay General Semiconductor is a bidirectional 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMAJ85CAHE3/61 datasheet, SMAJ85CAHE3/61 pinout, SMAJ85CAHE3/61 application, or SMAJ85CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative polarity transients without polarity-sensitive placement. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package supports high thermal dissipation via copper pad mounting per JESD22-B102 solderability standards.
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive underhood applications requiring robust ESD and load-dump immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 137 V at 2.2 A - Clamped voltage seen by downstream components during 10/1000 μs transient; limits stress on ICs and MOSFETs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capacity; determines survivability against ISO 7637-2 Pulse 1/2a/5a surges. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard reflow profiles and J-STD-002 soldering. |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking; terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; forms symmetrical conduction path with cathode. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; completes bidirectional clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints or external diode pairing. |
| 400 W peak pulse power (10/1000 μs) | Withstands automotive load dump (ISO 7637-2 Pulse 5a) and inductive switching spikes in 12 V/24 V systems. |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and accelerated life testing. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during transient events, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
| MSL Level 1 moisture sensitivity | Allows indefinite floor life before reflow; eliminates baking requirements and simplifies SMT line integration. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 120 V, 400 ms) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power input and DC/DC converter input stage. Use Value: Limits peak voltage to 137 V during ISO 7637-2 Pulse 5a, preventing overvoltage shutdown or damage to downstream regulators and microcontrollers. |
Use Scenario: Protects analog front-end inputs of pressure, temperature, and position sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface before signal conditioning amplifier. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) within nanoseconds while maintaining <1 pF junction capacitance at 0 V bias, preserving signal integrity. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Protection |
Use Scenario: Guards RS-485/RS-232 data lines against lightning-induced surges and ground potential differences in outdoor base stations. IC Role / Device Role / Timing Role: Bidirectional TVS connected across differential pair (A–B) and to ground reference plane. Use Value: Absorbs 300 W transient energy (10/1000 μs) without degradation, maintaining signal eye diagram integrity after repeated surge exposure. |
Use Scenario: Shields AC-DC adapter primary-side rectifier and controller ICs from mains-borne surges (IEC 61000-4-5 Level 3). IC Role / Device Role / Timing Role: Secondary-side TVS on DC output rail to suppress reflected transients from downstream USB or charging circuits. Use Value: Provides 137 V clamping at 2.2 A with <0.1 % duty cycle tolerance, ensuring sustained operation during repetitive surge events in shared-wall adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose SMAJ85CA-M3/61 for halogen-free supply chain requirements without compromising performance or qualification status. |
| SMBJ85CAHE3/61 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 25 % larger footprint and 10 % higher thermal resistance (RθJA = 135 °C/W). | Lower power density and reduced surge current handling (IPPM = 2.0 A vs. 2.2 A); suitable only where board space permits larger footprint. | Choose SMBJ85CAHE3/61 only if existing layout uses SMB pads or requires marginally higher surge margin at cost of board area. |
Compared with SMAJ85CAHE3/61, the SMAJ85CA-M3/61 offers identical protection performance with halogen-free materials, while SMBJ85CAHE3/61 trades compactness for slightly lower thermal efficiency and surge current capacity - making SMAJ85CAHE3/61 optimal for space-constrained AEC-Q101 automotive designs.
Availability
SMAJ85CAHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom line drivers, and consumer power adapter designs requiring stable component supply, AEC-Q101 qualification, and consistent TVS clamping performance across production batches.
Supply support for SMAJ85CAHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robust ESD and surge immunity are mandatory.
FAQ
What is the clamping voltage of SMAJ85CAHE3/61 at its rated peak pulse current?
The SMAJ85CAHE3/61 has a maximum clamping voltage (VC) of 137 V at its rated peak pulse current (IPPM) of 2.2 A under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and reflects the actual voltage imposed on protected circuitry during worst-case transient events. The clamping behavior remains stable across its full operating temperature range of –55 °C to +150 °C.
Is SMAJ85CAHE3/61 suitable for automotive applications?
Yes, SMAJ85CAHE3/61 is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and infotainment systems. Its bidirectional architecture, 150 °C maximum junction temperature, and validated performance under temperature cycling, HTRB, and ESD stress make it compliant with automotive reliability requirements. The HE3 suffix explicitly denotes AEC-Q101 qualification.
What is the difference between SMAJ85CAHE3/61 and SMAJ85CA-E3/61?
SMAJ85CAHE3/61 is AEC-Q101 qualified and RoHS-compliant, whereas SMAJ85CA-E3/61 is RoHS-compliant but not AEC-Q101 qualified. Both share identical electrical specifications (VWM = 85 V, VC = 137 V, PPPM = 400 W), same SMA package, and matte tin plating. The HE3 suffix indicates automotive-grade qualification, making SMAJ85CAHE3/61 appropriate for under-hood and safety-critical vehicle subsystems.
Does SMAJ85CAHE3/61 have polarity markings on the package?
No, SMAJ85CAHE3/61 does not have polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMAJ85A), which feature a cathode band, the CA suffix indicates symmetrical construction - meaning either terminal can serve as anode or cathode depending on transient polarity. This eliminates orientation constraints during automated placement.
What is the thermal resistance of SMAJ85CAHE3/61 and how does it affect PCB layout?
SMAJ85CAHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. To maintain safe operating temperatures under repetitive surge conditions, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size or omitting thermal vias increases junction temperature and may derate peak pulse power below 400 W.
SMAJ85CAHE3/61 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ85CAHE3/61 FAQ
1.How can I place an order for SMAJ85CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CAHE3/61 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 SMAJ85CAHE3/61 reliable?
The price and inventory of SMAJ85CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ85CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CAHE3/61?
SMAJ85CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CAHE3/61 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 SMAJ85CAHE3/61?
For technical support, including SMAJ85CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ85CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ85CAHE3/61 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 SMAJ85CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ85CAHE3/61?
All SMAJ85CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CAHE3/61, 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 SMAJ85CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ85CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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