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Vishay General Semiconductor - Diodes Division SMAJ85CA-M3/5A
- Part No.:
- SMAJ85CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CA-M3/5A.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,777
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Product details
Overview
SMAJ85CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. 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 - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ85CA-M3/5A datasheet, SMAJ85CA-M3/5A pinout, SMAJ85CA-M3/5A application, or SMAJ85CA-M3/5A equivalent, this device delivers verified bidirectional surge suppression with AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive and industrial PCB designs requiring stable clamping performance under repetitive transients.
Technical Context
The SMAJ85CA-M3/5A operates as a silicon avalanche diode with symmetrical bidirectional conduction, enabling clamping in both polarities without polarity marking. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, while the DO-214AC package supports automated SMT placement and meets UL 94 V-0 flammability.
It sustains 400 W peak pulse power up to 78 V and derates to 300 W above 78 V per Fig. 2; thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), with operating junction temperature range from –55 °C to +150 °C - validated for use in under-hood automotive environments and industrial control cabinets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 72–85 V DC bus systems. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering within ±5% tolerance across production lots. |
| VC @ IPPM | 137 V at 2.2 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to sub-140 V during 400 W transient events. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power rating per standard waveform; enables protection against ISO 7637-2 Pulse 1/2a/5a in automotive applications. |
| IFSM | 40 A - Non-repetitive forward surge current (8.3 ms half-sine); supports unidirectional surge handling in hybrid protection schemes. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in high-ambient environments such as engine control modules and motor drives. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with IPC-7351B standard land patterns. |
Pinout & Package
Package: SMA (DO-214AC) - molded plastic case with matte tin-plated leads, compliant with J-STD-002 solderability and JESD22-B102 whisker testing. Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Both terminals function identically; connects across protected line (e.g., CAN_H–CAN_L or VCC–GND) without orientation dependency. |
| Case / Body | Non-conductive molding compound | UL 94 V-0 rated thermoset polymer; provides electrical isolation and mechanical robustness during reflow and board flexure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; supports PPAP documentation for Tier 1 suppliers. |
| 400 W peak pulse power (10/1000 μs) | Clamps high-energy transients like load dump (ISO 16750-2) and inductive switching spikes without degradation over 1000+ events. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes let-through voltage to protect 100 V-rated MOSFETs and microcontrollers; reduces need for additional series impedance. |
| Halogen-free & RoHS-compliant (M3) | Meets EU Directive 2011/65/EU and JEDEC JS709E; eliminates brominated flame retardants for safer end-of-life processing. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without baking; eliminates moisture-related popcorning risk during standard lead-free reflow profiles. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs in body control modules (BCM) and ADAS domain controllers from ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: Bidirectional TVS placed between VBAT and GND, clamping transients within 1 ns response time to limit voltage excursion below 140 V. Use Value: Prevents latch-up and gate oxide damage in PMICs and MCU power supplies; maintains system uptime during repeated vehicle cranking cycles. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules from EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF at VWM) placed differential across signal pair (e.g., RS-485 A/B), suppressing ±2 kV ESD per IEC 61000-4-2. Use Value: Preserves signal integrity below 1 MHz bandwidth; avoids false triggering in 4–20 mA loop receivers and ADC front-ends. |
| Telecom DC Power Feeding | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding PoE-powered devices (e.g., IP cameras, wireless access points) connected to IEEE 802.3af/at PSE outputs against surges induced by nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional clamp on DC input rail (typically 48 V), coordinated with upstream fuse and downstream DC-DC converter overvoltage lockout. Use Value: Absorbs 400 W surges without failure, enabling Class 4 PoE compatibility and reducing field return rates due to surge-induced brownouts. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers, where back-EMF exceeds 150 V. IC Role / Device Role / Timing Role: TVS mounted across motor terminals or H-bridge outputs, triggered within 1 ns to clamp flyback energy into safe VC window. Use Value: Extends MOSFET lifetime by limiting VDS overshoot; eliminates need for snubber RC networks and saves PCB area in cost-sensitive white goods. |
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-E3/5A | Same electrical specs and package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial use only; not approved for automotive under-hood deployment. | Select when halogen-free requirement is absent and automotive qualification is unnecessary. |
| SMBJ85CA-M3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package (5.28 mm × 4.57 mm); identical VWM/VC values. | Used where higher surge margin is needed (e.g., outdoor telecom enclosures); requires larger PCB pad layout. | Choose when system-level surge test requirements exceed 400 W or when legacy SMB footprint is fixed. |
Compared with SMAJ85CA-M3/5A, the E3/5A variant offers identical protection performance without halogen-free assurance or automotive qualification, while the SMBJ85CA-M3 delivers 50% higher surge capacity in a physically larger package - making SMAJ85CA-M3/5A the optimal balance of AEC-Q101 compliance, halogen-free materials, and space-constrained SMT layouts.
Availability
SMAJ85CA-M3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feeding systems requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMAJ85CA-M3/5A 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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-speed, high-energy transient suppression in automotive, industrial, and communications infrastructure - delivering consistent clamping performance across temperature and lifetime with minimal derating.
FAQ
What is the clamping voltage of SMAJ85CA-M3/5A at its rated peak pulse current?
The SMAJ85CA-M3/5A 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. The clamping behavior remains stable across its full operating temperature range (–55 °C to +150 °C), making SMAJ85CA-M3/5A suitable for harsh-environment applications where voltage excursions must be tightly bounded.
Is SMAJ85CA-M3/5A certified for automotive use?
Yes, SMAJ85CA-M3/5A carries the HM3 suffix, indicating it is halogen-free, RoHS-compliant, and AEC-Q101 qualified. This certification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD per JESD22-A114. The qualification applies specifically to the SMAJ85CA-M3/5A part number - not inferred from family data - and supports PPAP submission for automotive Tier 1 suppliers integrating SMAJ85CA-M3/5A into ECU and ADAS hardware.
How does the bidirectional design of SMAJ85CA-M3/5A affect its circuit placement?
The bidirectional architecture of SMAJ85CA-M3/5A eliminates polarity constraints: it can be placed across any two nodes requiring symmetrical overvoltage protection - such as CAN_H/CAN_L differential pairs, AC-coupled signal lines, or dual-rail power domains. Unlike unidirectional TVS diodes, SMAJ85CA-M3/5A has no cathode band marking, simplifying automated placement and reducing assembly errors. Its symmetrical VBR ensures identical clamping in both directions, which is essential for protecting balanced interfaces subject to bipolar transients.
What is the thermal resistance of SMAJ85CA-M3/5A, and how does it impact PCB layout?
SMAJ85CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads per JEDEC standards. To maintain safe junction temperatures under repetitive surges, PCB layout must provide adequate copper area - minimum 5.0 mm × 5.0 mm per terminal - and avoid thermal bottlenecks. These values are documented in the "Thermal Characteristics" section of the official Vishay datasheet (Doc #88390), and directly inform thermal derating curves used in SMAJ85CA-M3/5A reliability modeling.
Can SMAJ85CA-M3/5A replace SMAJ85A-M3/5A in existing designs?
No - SMAJ85CA-M3/5A and SMAJ85A-M3/5A are not interchangeable. SMAJ85CA-M3/5A is bidirectional with symmetrical clamping, while SMAJ85A-M3/5A is unidirectional and requires correct cathode orientation. Substituting one for the other risks open-circuit failure during reverse-polarity transients or unintended conduction in DC-biased paths. The "CA" suffix explicitly denotes bidirectional functionality per Vishay's naming convention, and this distinction is verified in the Electrical Characteristics table (page 2 of Doc #88390). Always validate replacement using the exact SMAJ85CA-M3/5A datasheet.
SMAJ85CA-M3/5A 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:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ85CA-M3/5A FAQ
1.How can I place an order for SMAJ85CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CA-M3/5A 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 SMAJ85CA-M3/5A reliable?
The price and inventory of SMAJ85CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ85CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CA-M3/5A?
SMAJ85CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CA-M3/5A 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 SMAJ85CA-M3/5A?
For technical support, including SMAJ85CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ85CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ85CA-M3/5A 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 SMAJ85CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ85CA-M3/5A?
All SMAJ85CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CA-M3/5A, 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 SMAJ85CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ85CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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