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Vishay General Semiconductor - Diodes Division SMAJ33AHE3_A/I
- Part No.:
- SMAJ33AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33AHE3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,248
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Product details
Overview
SMAJ33AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 7.5 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 SMAJ33AHE3_A/I datasheet, SMAJ33AHE3_A/I pinout, SMAJ33AHE3_A/I application, or SMAJ33AHE3_A/I equivalent, this AEC-Q101 qualified, RoHS-compliant TVS diode offers verified clamping performance, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and load-dump protection design validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents <1 μA leakage at 33 V, then rapidly avalanches to clamp transients up to 53.3 V at 7.5 A. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), enabling effective suppression of ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and inductive switching spikes.
The device is rated for continuous power dissipation of 3.3 W at 50 °C ambient, with thermal resistance junction-to-ambient of 120 °C/W and junction-to-lead of 30 °C/W. It supports peak forward surge current of 40 A (8.3 ms half-sine) and operates across –55 °C to +150 °C junction temperature range - validated for automotive-grade reliability per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse operating voltage before significant leakage begins; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on behavior across production lots |
| VC (Clamping Voltage) | 53.3 V at 7.5 A IPPM - maximum voltage seen by protected circuit during 10/1000 μs transient; determines downstream IC survivability |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for standardized surge events; derates to 300 W above 78 V |
| IR (Reverse Leakage) | ≤1.0 μA at 33 V - negligible standby power loss and minimal signal integrity impact on high-impedance nodes |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and thermally constrained industrial enclosures |
| AEC-Q101 Qualified | Yes - validated for automotive electronic modules including engine control, body electronics, and ADAS sensor interfaces |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during overvoltage event |
| Cathode | Protected line connection / high-side terminal | Connected to I/O line or power rail being safeguarded; avalanche conduction occurs from cathode to anode |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Handles automotive load-dump surges and industrial inductive kickback without degradation |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes stress on downstream 3.3 V or 5 V logic while maintaining noise margin |
| Glass passivated chip junction | Ensures long-term parameter stability and resistance to humidity-induced drift |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly without pre-baking or special handling |
| AEC-Q101 qualification | Validated for automotive applications requiring zero defects and extended temperature cycling |
Applications
| Automotive Engine Control Unit (ECU) | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting microcontroller I/O pins and LIN bus transceivers from alternator load dump and battery reverse polarity transients. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly at connector entry point, clamping surges before they reach MCU GPIO or analog front-end. Use Value: Limits voltage to ≤53.3 V during 400 W pulses, preventing latch-up or gate oxide damage in 3.3 V/5 V automotive MCUs. | Use Scenario: Safeguarding CANH/CANL differential pair against ESD events and inductive coupling in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional TVS on each CAN line referenced to ground, absorbing common-mode transients while preserving signal integrity. Use Value: Sub-1 ns response ensures clamping occurs before CAN transceiver input stages are stressed, maintaining bit error rate compliance. |
| Consumer Power Adapter Input Stage | Telecom Base Station Sensor Monitoring |
Use Scenario: Secondary-side overvoltage protection on 12 V DC output rails of wall-mounted AC/DC adapters. IC Role / Device Role / Timing Role: Standoff-rated TVS parallel to load, activated only during fault conditions such as regulator failure or cable short-circuit. Use Value: 33 V VWM provides 10 % margin above nominal 12 V rail, while 53.3 V clamping prevents damage to downstream DC-DC converters. | Use Scenario: Protecting analog temperature/humidity sensor inputs from lightning-induced surges on outdoor telecom cabinet wiring. IC Role / Device Role / Timing Role: Point-of-entry TVS on each sensor signal line, placed immediately after connector to minimize stub inductance. Use Value: 400 W pulse rating withstands multi-kV induced transients; low leakage (<1 μA) avoids measurement offset in precision 24-bit ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101) | Lacks automotive qualification; suitable for consumer/industrial designs without AEC requirements | Select when cost sensitivity outweighs automotive reliability validation needs |
| SMBJ33AHE3_A/I | Same VWM, VBR, VC; higher 600 W PPPM rating; larger SMB (DO-214AA) package | Higher surge capability but requires larger PCB footprint; better thermal dissipation | Choose for systems exposed to repeated high-energy transients where layout space permits |
Compared with SMAJ33A-E3/61, the SMAJ33AHE3_A/I adds AEC-Q101 qualification and tighter process controls for automotive use; versus SMBJ33AHE3_A/I, it trades 200 W pulse power headroom for 30 % smaller board area and identical mounting compatibility with existing SMA footprints.
Availability
SMAJ33AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial CAN bus hardening, and telecom sensor interface stabilization requiring stable component supply across multi-year production cycles.
Supply support for SMAJ33AHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for board-level transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and qualification-grade consistency are mandatory.
FAQ
What is the clamping voltage of SMAJ33AHE3_A/I at its rated peak pulse current?
The SMAJ33AHE3_A/I has a maximum clamping voltage (VC) of 53.3 V at 7.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees the protected circuit will not experience more than 53.3 V during a defined surge event - a critical parameter for ensuring compatibility with 3.3 V or 5 V logic interfaces downstream of the SMAJ33AHE3_A/I.
Is SMAJ33AHE3_A/I suitable for automotive applications?
Yes, SMAJ33AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life - making it appropriate for engine control units, body control modules, and ADAS sensor interfaces where reliability under vibration and thermal extremes is required. The SMAJ33AHE3_A/I meets these standards without derating.
How does the SMAJ33AHE3_A/I differ from bidirectional variants like SMAJ33CA?
The SMAJ33AHE3_A/I is unidirectional, meaning it conducts only in reverse bias (cathode-to-anode) and blocks forward current - ideal for DC power rail or single-polarity signal line protection. In contrast, SMAJ33CA is bidirectional and symmetrical, conducting in both directions, suited for AC lines or differential buses like RS-485. The SMAJ33AHE3_A/I's unidirectional nature gives it lower leakage and sharper knee characteristics compared to its bidirectional counterpart.
What is the maximum operating temperature for SMAJ33AHE3_A/I?
The SMAJ33AHE3_A/I has a specified operating junction temperature range of –55 °C to +150 °C. This allows deployment in under-hood automotive locations, industrial motor drives, and outdoor telecom equipment. Its thermal resistance (RθJA = 120 °C/W) means that at 3.3 W continuous power dissipation, the junction rises ~400 °C above ambient - so actual usable power depends on PCB copper area and airflow; the SMAJ33AHE3_A/I must be mounted per recommended pad layout to achieve rated performance.
Does SMAJ33AHE3_A/I require special PCB layout considerations?
Yes - to achieve full 400 W pulse rating, the SMAJ33AHE3_A/I must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay's datasheet Fig. 1. Smaller pads reduce heat spreading and cause premature thermal runaway during surge events. Additionally, keep trace length between the SMAJ33AHE3_A/I and protected node as short as possible (<5 mm preferred) to minimize inductive voltage overshoot during fast transients.
SMAJ33AHE3_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:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33AHE3_A/I FAQ
1.How can I place an order for SMAJ33AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33AHE3_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 SMAJ33AHE3_A/I reliable?
The price and inventory of SMAJ33AHE3_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 SMAJ33AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ33AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33AHE3_A/I?
SMAJ33AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33AHE3_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 SMAJ33AHE3_A/I?
For technical support, including SMAJ33AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ33AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ33AHE3_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 SMAJ33AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ33AHE3_A/I?
All SMAJ33AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33AHE3_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 SMAJ33AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ33AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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