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Vishay General Semiconductor - Diodes Division SMAJ33CAHM3_A/I
- Part No.:
- SMAJ33CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAHM3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ33CAHM3_A/I 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 signal or power lines. It features a 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 7.5 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ33CAHM3_A/I datasheet, SMAJ33CAHM3_A/I pinout, SMAJ33CAHM3_A/I application, or SMAJ33CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), 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 protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the SMA package supports high surge current handling (40 A IFSM) and meets MSL Level 1 reflow requirements (260 °C peak).
The device delivers consistent clamping performance across temperature (VBR tempco = 0.100 %/°C) and maintains low incremental surge resistance under repetitive transient stress. It is rated for operation from –55 °C to +150 °C junction temperature and is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min / max | 36.7 V / 40.6 V at 1.0 mA - verified breakdown threshold range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 53.3 V at 7.5 A - clamped voltage seen by protected circuit during 10/1000 μs surge; limits downstream stress. |
| PPPM | 400 W - peak transient energy absorption capacity with standardized waveform; sufficient for IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - enables deployment in under-hood automotive or high-temperature industrial environments without derating. |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current from either direction during clamping. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or reference rail during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global OEM supply chains without compromising surge robustness. |
| 400 W peak pulse power | Handles IEC 61000-4-5 combination wave surges up to 1 kV/42 Ω without degradation when mounted per recommended pad layout. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced failure; eliminates baking requirement pre-assembly. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated transient stress in harsh EMI environments. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and chassis ground to shunt transients before reaching sensitive front-end circuitry. Use Value: Maintains signal fidelity during 100 V/50 ms load dump events while limiting clamped voltage to ≤53.3 V - within absolute maximum ratings of most 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against inductive switching spikes from solenoids and contactors. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp on 24 V DC I/O lines, installed adjacent to connector entry points to intercept surges before PCB routing. Use Value: Absorbs 400 W transient energy without latch-up or parametric shift, preserving functional safety integrity across 100,000+ surge cycles per IEC 61000-4-5. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Protection |
|
Use Scenario: Shielding USB-C PD and auxiliary power rails in smart home hubs from ESD and lightning-induced surges entering via AC/DC adapter inputs. IC Role / Device Role / Timing Role: Primary-level TVS placed at AC/DC converter output to suppress fast-rising transients before LDO regulators and microcontrollers. Use Value: Sub-1 ns response time and 53.3 V clamping enable compliance with IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) without secondary filtering overhead. |
Use Scenario: Protecting Ethernet PHYs and analog line drivers on telecom base station line cards exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Secondary-stage transient suppressor on twisted-pair interface lines, coordinated with gas discharge tubes for staged protection architecture. Use Value: Low clamping voltage (53.3 V) and precise VWM (33 V) allow tight coordination with upstream GDTs while avoiding false triggering during normal mode noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CAHE3_A/I | Same electrical specs and AEC-Q101 qualification; differs only in RoHS-compliant (non-halogen-free) plating. | Acceptable where halogen-free material content is not mandated by end-customer specification. | Select when cost sensitivity outweighs halogen-free requirement and full automotive qualification remains essential. |
| SMBJ33CAHM3_A/I | Higher 600 W PPPM rating and larger SMB (DO-214AA) package; otherwise identical VWM, VC, and temperature specs. | Better suited for higher-energy surge environments (e.g., outdoor telecom enclosures) where PCB space permits larger footprint. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and thermal margin must be increased beyond SMA package limits. |
Compared with SMAJ33CAHM3_A/I, SMAJ33CAHE3_A/I offers identical surge performance without halogen-free compliance, while SMBJ33CAHM3_A/I provides 50 % higher pulse power in a larger package - enabling extended lifetime in high-duty-cycle industrial applications without changing circuit topology.
Availability
SMAJ33CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line card designs requiring stable component supply with guaranteed AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ33CAHM3_A/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, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series was developed specifically for high-reliability transient suppression in space-constrained, thermally demanding applications - targeting automotive, industrial automation, and infrastructure equipment where AEC-Q101 compliance and repeatable clamping are mandatory.
FAQ
What is the clamping voltage of the SMAJ33CAHM3_A/I under a 10/1000 μs surge?
The SMAJ33CAHM3_A/I exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 7.5 A with a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that protected downstream components experience no more than 53.3 V during such transient events - critical for safeguarding 3.3 V or 5 V logic interfaces. The SMAJ33CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the SMAJ33CAHM3_A/I suitable for automotive applications?
Yes, the SMAJ33CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HM3" indicating halogen-free, RoHS-compliant, and AEC-Q101 validated construction. It is deployed in engine control units, body electronics, and ADAS sensor modules where robustness against load dump, jump start, and ISO 7637-2 pulses is required. The SMAJ33CAHM3_A/I's thermal and surge specifications meet stringent automotive environmental stress profiles.
How does the bidirectional configuration of SMAJ33CAHM3_A/I affect its circuit placement?
The SMAJ33CAHM3_A/I has no polarity marking and functions identically in both directions, making it ideal for protecting AC-coupled signals, differential buses (e.g., RS-485, CAN), or ungrounded power rails where voltage polarity reversal may occur. Unlike unidirectional TVS diodes, the SMAJ33CAHM3_A/I eliminates orientation errors during automated placement and simplifies schematic symbol usage - no cathode band alignment is needed. Its symmetric IV curve ensures matched clamping in either direction.
What is the maximum steady-state power dissipation for SMAJ33CAHM3_A/I?
The SMAJ33CAHM3_A/I has a maximum steady-state power dissipation (PD) of 3.3 W when mounted on an infinite heatsink at TA = 50 °C. In typical PCB applications using the recommended 0.2" × 0.2" copper pads per terminal, derating applies per Figure 2 in the datasheet. This rating governs continuous leakage-based heating and is distinct from its 400 W transient capability - the SMAJ33CAHM3_A/I is not intended for sustained DC power dissipation but rather momentary surge absorption.
Does SMAJ33CAHM3_A/I require special PCB layout considerations?
Yes - optimal performance of the SMAJ33CAHM3_A/I requires adherence to Vishay's recommended mounting pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, with minimum trace width and length to reduce inductance. Deviations increase clamping voltage during fast transients. The SMAJ33CAHM3_A/I's low RθJL (30 °C/W) relies on this thermal path; inadequate copper area causes junction overheating and premature failure under repetitive surges.
SMAJ33CAHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SMAJ33CAHM3_A/I FAQ
1.How can I place an order for SMAJ33CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAHM3_A/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 SMAJ33CAHM3_A/I reliable?
The price and inventory of SMAJ33CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ33CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAHM3_A/I?
SMAJ33CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAHM3_A/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 SMAJ33CAHM3_A/I?
For technical support, including SMAJ33CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ33CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAHM3_A/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 SMAJ33CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ33CAHM3_A/I?
All SMAJ33CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAHM3_A/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 SMAJ33CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ33CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CAHM3_A/I Tags
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