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Vishay General Semiconductor - Diodes Division SMAJ33A-M3/5A
- Part No.:
- SMAJ33A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33A-M3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ33A-M3/5A from Vishay General Semiconductor is a unidirectional 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 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFET gates and microcontroller I/O in industrial motor drives.
For engineers reviewing the SMAJ33A-M3/5A datasheet, SMAJ33A-M3/5A pinout, SMAJ33A-M3/5A application, or SMAJ33A-M3/5A equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by transient overvoltage events exceeding its reverse stand-off voltage (33 V). Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, ensuring effective suppression of ESD, inductive switching spikes, and lightning-induced surges.
The SMAJ33A-M3/5A is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and meets J-STD-020 MSL Level 1 with peak reflow temperature of 260 °C - confirming suitability for standard SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - guaranteed breakdown range defining turn-on threshold under standardized test conditions |
| VC @ IPPM | 53.3 V at 7.5 A - clamped voltage during 10/1000 μs transient; must remain below protected device's absolute max rating |
| PPPM | 400 W (≤78 V) - peak transient energy absorption capability; derates to 300 W above 78 V per datasheet note |
| ID @ VWM | 1.0 μA - reverse leakage at stand-off voltage; low value minimizes standby power loss and false triggering |
| RθJA | 120 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; determines power derating above 25 °C |
| Polarity | Unidirectional - cathode marked by band; blocks forward conduction, clamps only reverse transients |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode identified by molded band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to lower-potential node (e.g., GND or source); completes clamping loop during reverse overvoltage |
| Cathode | Clamping output / protected line connection | Connected to line being protected (e.g., 33 V rail or MCU input); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 33 V systems without derating |
| Glass-passivated chip junction | Ensures stable VBR over lifetime and improved reliability vs. epoxy-passivated alternatives under thermal cycling |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without baking or special handling; compatible with standard SMT lines |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for automotive and industrial end equipment without sacrificing performance |
| AEC-Q101 qualified variants available | HE3/HM3 versions meet automotive stress testing; SMAJ33A-M3/5A is commercial-grade but shares identical die and package |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting gate drivers and sense resistors from inductive kickback during MOSFET/IGBT switching in 24 V DC bus systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed across gate-source or supply-rail inputs to clamp transients within 1 ns. Use Value: Limits voltage overshoot to ≤53.3 V, preventing gate oxide rupture in 60 V-rated MOSFETs while sustaining 400 W surge loads. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs from load dump and jump-start transients in 12 V vehicle networks. IC Role / Device Role / Timing Role: Standoff-rated clamping device on LIN data line and VCC pins, activated only during >33 V excursions. Use Value: Maintains <1.0 μA leakage at 33 V to avoid bus contention, while clamping 7.5 A surges to 53.3 V - within ISO 16750-2 pulse 5a limits. |
| Programmable Logic Controller (PLC) I/O Module | Telecom Power Supply Monitoring |
|
Use Scenario: Shielding analog input channels (e.g., 4–20 mA receivers) from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: First-line transient suppressor mounted directly at connector entry, ahead of precision op-amps and ADCs. Use Value: 53.3 V clamping ensures downstream 36 V absolute-maximum-rated instrumentation amplifiers remain undamaged during 1 kV/500 Ω surge events. |
Use Scenario: Protecting voltage supervisor ICs and PMIC reset inputs in 48 V telecom rectifier modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) standoff protector on VDD monitor line, preserving accuracy during normal 48 V operation. Use Value: Withstands repetitive 400 W pulses without parameter shift, enabling reliable brown-out detection even after multiple surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A | Same electrical specs and package; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Acceptable for commercial/industrial use where halogen-free requirement is not mandated | Select E3 if halogen content is unrestricted and cost is prioritized; M3 required for IPC-1752A Class 4 or EU green procurement |
| SMBJ33A-M3 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher RθJA (90 °C/W) and 600 W PPPM rating | Better thermal performance and surge margin, but requires larger PCB footprint and different pad layout | Choose SMBJ33A-M3 when higher surge endurance (>400 W) or improved thermal dissipation is needed; SMAJ33A-M3/5A preferred for space-constrained layouts |
Compared with SMAJ33A-E3/5A, the M3 variant adds halogen-free compliance without electrical trade-offs; versus SMBJ33A-M3, it trades 200 W pulse power headroom and 30 °C/W lower thermal resistance for 30 % smaller board area - making SMAJ33A-M3/5A optimal for compact, environmentally regulated designs.
Availability
SMAJ33A-M3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, PLC I/O protection, and telecom power monitoring requiring stable component supply and halogen-free compliance.
Supply support for SMAJ33A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series targets cost-sensitive, high-volume transient protection needs in consumer, industrial, and automotive electronics - delivering standardized TVS performance in compact, automated-assembly-ready packages.
FAQ
What is the maximum clamping voltage of the SMAJ33A-M3/5A under a 10/1000 μs surge?
The SMAJ33A-M3/5A has a maximum clamping voltage (VC) of 53.3 V at 7.5 A peak pulse current (IPPM) for a 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on the protected circuit during transient events - critical for ensuring compatibility with 60 V-rated MOSFETs or 55 V-tolerant interface ICs in the same design. The SMAJ33A-M3/5A maintains this clamping performance across its full operating temperature range.
Does the SMAJ33A-M3/5A have AEC-Q101 qualification?
No, the SMAJ33A-M3/5A is a commercial-grade part with halogen-free RoHS compliance (M3 suffix) but is not AEC-Q101 qualified. Vishay offers AEC-Q101 variants under the HM3 suffix (e.g., SMAJ33AHM3_A/I), which share identical electrical characteristics and package but undergo additional automotive stress testing. For automotive applications requiring qualification, specify the HM3 version; SMAJ33A-M3/5A remains suitable for industrial and consumer designs where AEC-Q101 is not mandated.
What is the thermal resistance of the SMAJ33A-M3/5A, and how does it affect power derating?
The SMAJ33A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per datasheet condition. This means each watt of steady-state power dissipates a 120 °C temperature rise from junction to ambient air. Since its rated power dissipation (PD) is 3.3 W at TA = 50 °C, operation above 50 °C requires linear derating - e.g., at 100 °C ambient, usable PD drops to ~1.65 W. The SMAJ33A-M3/5A is intended for transient, not continuous, power dissipation.
How is polarity marked on the SMAJ33A-M3/5A, and why does it matter for circuit layout?
The SMAJ33A-M3/5A uses a cathode band (visible molded stripe) on the package body to identify the cathode terminal. As a unidirectional TVS, it conducts only when the cathode is at higher potential than the anode - meaning the cathode must be connected to the line being protected (e.g., 33 V rail), and the anode to reference (e.g., ground). Reversing polarity renders the device ineffective for transient suppression and may cause forward conduction during normal operation. Correct orientation is essential for both function and reliability in the SMAJ33A-M3/5A implementation.
Can the SMAJ33A-M3/5A replace the SMAJ33A-E3/5A without layout changes?
Yes, the SMAJ33A-M3/5A is a direct drop-in replacement for the SMAJ33A-E3/5A: both share identical SMA (DO-214AC) package dimensions, pinout, solder pad layout, and all electrical specifications (VWM, VBR, VC, PPPM, etc.). The only difference is material composition - M3 is halogen-free while E3 uses brominated flame retardants. No PCB redesign, footprint adjustment, or schematic change is needed when upgrading from E3 to M3; the SMAJ33A-M3/5A satisfies stricter environmental mandates without compromising performance or fit.
SMAJ33A-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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33A-M3/5A FAQ
1.How can I place an order for SMAJ33A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33A-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 SMAJ33A-M3/5A reliable?
The price and inventory of SMAJ33A-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 SMAJ33A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ33A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33A-M3/5A?
SMAJ33A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33A-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 SMAJ33A-M3/5A?
For technical support, including SMAJ33A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33A-M3/5A requirements.
6.How does Aetrix verify that SMAJ33A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ33A-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 SMAJ33A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ33A-M3/5A?
All SMAJ33A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33A-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 SMAJ33A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ33A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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