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Vishay General Semiconductor - Diodes Division SMAJ36CAHM3/I
- Part No.:
- SMAJ36CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36CAHM3/I.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,300
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Product details
Overview
SMAJ36CAHM3/I 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 36 V standoff voltage (VWM), 40.0–44.2 V breakdown voltage (VBR) at 1 mA, 58.1 V maximum clamping voltage (VC) at 6.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor signal lines, industrial I/O interfaces, and DC power rails.
For engineers reviewing the SMAJ36CAHM3/I datasheet, SMAJ36CAHM3/I pinout, SMAJ36CAHM3/I application, or SMAJ36CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>100 MΩ at 36 V), but switches to low-impedance conduction within <1 ps when transients exceed VBR, diverting surge energy to ground. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping performance across temperature.
The SMAJ36CAHM3/I is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 120 °C/W (on recommended pad layout) and RθJL = 30 °C/W. It meets JESD201 Class 2 whisker resistance and UL 497B recognition (QVGQ2, E136766) for both unidirectional and bidirectional configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 36 V nominal DC systems. |
| VBR (min/max) | 40.0 V / 44.2 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system operating voltage with margin. |
| VC @ IPPM | 58.1 V at 6.9 A - Clamped voltage during 400 W 10/1000 μs surge; limits downstream IC stress to ≤58.1 V under worst-case transient. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports repetitive surges up to 0.01% duty cycle at 25 °C. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inductive switch-off events. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| MSL Level | Level 1 (per J-STD-020) - No floor life limitation; supports standard reflow without baking prior to assembly. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides symmetrical conduction path for positive and negative transients; connects to protected line or ground reference. |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode in CA devices; forms dual-junction structure enabling equal clamping in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V/24 V systems without degradation when mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - critical for protecting 3.3 V/5 V logic interfaces downstream of protection stage. |
| MSL Level 1 & lead-free compatible | Enables direct placement into standard Pb-free reflow profiles (peak 260 °C) without moisture sensitivity concerns or pre-bake requirements. |
| Glass passivated junction | Ensures stable leakage current (<1.0 μA at 36 V) and long-term parameter stability under thermal/humidity stress per JESD22-A101. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt TVS placed between signal line and chassis ground, clamping transients before they reach input protection diodes of transceiver ICs. Use Value: Maintains signal integrity by limiting transient voltage to ≤58.1 V, preventing latch-up or permanent damage to 5 V tolerant receiver inputs. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact input circuit, positioned upstream of optocoupler or Schmitt-trigger input stage. Use Value: Absorbs 400 W surges without failure, ensuring >100,000 switching cycles while maintaining <1 μA leakage at 24 V nominal. |
| DC Power Rail Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary protection on 36 V intermediate bus in telecom power supplies and PoE injectors subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response parallel clamp that activates before upstream MOVs or GDTs, reducing let-through voltage to downstream DC/DC converters. Use Value: Clamps 10/1000 μs surges to 58.1 V within <1 ps, limiting stress on 40 V-rated input capacitors and MOSFETs. |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., RJ45 magnetics secondary side) against ESD (IEC 61000-4-2 ±15 kV) and induced surges in base station line cards. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at connector, shunting transients before signal conditioning circuitry. Use Value: Provides symmetrical clamping with <0.5 pF junction capacitance (typ.) at 0 V - preserving 100BASE-TX signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CAHE3/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free certification. | Acceptable for commercial/industrial use where halogen-free compliance is not mandated (e.g., non-automotive BOMs). | Select SMAJ36CAHE3/I if halogen-free material requirement is waived and cost optimization is prioritized. |
| SMBJ36CAHM3/I | Identical VWM, VBR, and VC, but SMB (DO-214AA) package - 29% larger footprint and 20% higher PPPM (600 W). | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger package. | Choose SMBJ36CAHM3/I only when 600 W surge rating is required and board layout accommodates 4.58 mm × 3.94 mm footprint. |
Compared with SMAJ36CAHM3/I, SMAJ36CAHE3/I offers identical protection performance without halogen-free assurance, while SMBJ36CAHM3/I delivers higher surge capacity in a larger package - neither is pin-compatible due to differing package outlines, requiring layout revision for substitution.
Availability
SMAJ36CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input conditioning, and telecom DC power rail stabilization requiring stable component supply, AEC-Q101 traceability, and halogen-free compliance.
Supply support for SMAJ36CAHM3/I 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for fast response, stable clamping, and seamless integration into automated SMT production lines.
FAQ
What is the clamping voltage of SMAJ36CAHM3/I at its rated peak pulse current?
The SMAJ36CAHM3/I has a maximum clamping voltage (VC) of 58.1 V at 6.9 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees that downstream circuitry sees no more than 58.1 V during a 400 W transient event. The SMAJ36CAHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal derating.
Is SMAJ36CAHM3/I qualified for automotive applications?
Yes, SMAJ36CAHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390 (Revision 09-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, making SMAJ36CAHM3/I suitable for under-hood and chassis-mounted automotive modules such as body control units and ADAS sensor interfaces.
What does the "HM3" suffix indicate in SMAJ36CAHM3/I?
The "HM3" suffix in SMAJ36CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" indicates AEC-Q101 qualification, "M" signifies halogen-free molding compound, and "3" confirms RoHS compliance per EU Directive 2011/65/EU. This distinguishes SMAJ36CAHM3/I from non-automotive variants like SMAJ36CA-E3/I and ensures compliance with stringent automotive material requirements.
How does SMAJ36CAHM3/I differ from unidirectional SMAJ36AHM3/I?
SMAJ36CAHM3/I is bidirectional, providing symmetrical clamping for both positive and negative transients, with no cathode band marking. In contrast, SMAJ36AHM3/I is unidirectional, featuring a cathode band and conducting only in reverse bias - requiring correct polarity orientation during placement. Both share identical VWM (36 V), VBR, and VC, but SMAJ36CAHM3/I is selected for AC-coupled or floating signal lines where polarity reversal is possible.
What is the maximum leakage current of SMAJ36CAHM3/I at its standoff voltage?
The SMAJ36CAHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 36 V standoff voltage (VWM) and 25 °C ambient temperature, as specified in the Electrical Characteristics table of Vishay datasheet 88390. This low leakage ensures minimal power loss in always-on circuits and prevents false triggering in high-impedance sensing nodes - a critical parameter for battery-powered automotive sensors using SMAJ36CAHM3/I.
SMAJ36CAHM3/I 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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ36CAHM3/I FAQ
1.How can I place an order for SMAJ36CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36CAHM3/I 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 SMAJ36CAHM3/I reliable?
The price and inventory of SMAJ36CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ36CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36CAHM3/I?
SMAJ36CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36CAHM3/I 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 SMAJ36CAHM3/I?
For technical support, including SMAJ36CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36CAHM3/I requirements.
6.How does Aetrix verify that SMAJ36CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ36CAHM3/I 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 SMAJ36CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ36CAHM3/I?
All SMAJ36CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36CAHM3/I, 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 SMAJ36CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ36CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ36CAHM3/I Tags
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