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Diodes Incorporated SMAJ33A-13
- Part No.:
- SMAJ33A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33A-13.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
SMAJ33A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 33V reverse standoff voltage (VRWM), 36.7–40.6V breakdown voltage (VBR) at 1mA, 53.3V maximum clamping voltage (VC) at 7.5A peak pulse current, and operates from –55°C to +150°C - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ33A-13 datasheet, SMAJ33A-13 pinout, SMAJ33A-13 application, or SMAJ33A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity handling, SMA package thermal derating above 25°C, and compatibility with lead-free reflow profiles per J-STD-020C Level 1.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1ps) and stable clamping during transient events such as ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges (IEC 61000-4-5). Its unidirectional configuration provides low-leakage forward conduction while blocking reverse surge energy.
The device is rated for 400W non-repetitive peak pulse power (PPK) with derating above 25°C ambient, supports 40A peak forward surge current (IFSM) at 8.3ms half-sine wave, and maintains 1.0W steady-state power dissipation at TL = 75°C - enabling robust placement near connectors or IC inputs without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms transients up to 7.5A without failure |
| Reverse Standoff Voltage | 33V - defines maximum continuous DC operating voltage before clamping begins |
| Breakdown Voltage | 36.7–40.6V @ 1mA - ensures reliable triggering margin above VRWM |
| Clamping Voltage | 53.3V @ 7.5A - limits downstream voltage stress during worst-case surge |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial ambient conditions |
| Package | SMA (DO-214AC) - 2-pin surface-mount footprint with 5.59mm max body length and 2.30mm max width |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band marking for polarity identification, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to protected line's lower-potential side (e.g., GND or return) |
| Cathode | Clamping node | Connected to protected line's higher-potential side (e.g., VCC or signal rail); cathode band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR tolerance and long-term reliability under thermal cycling |
| Fast response time | <1 ps - clamps before sensitive downstream ICs experience overvoltage damage |
| Lead-free / RoHS compliant | Matte tin finish meets EU Directive Annex exemptions (Rev. 13.2.2003) |
| JEDEC-compliant surge rating | 40A IFSM at 8.3ms half-sine wave - validated for repetitive surge testing per JEDEC Method |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protects 24V DC input stage of programmable logic controllers against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤53.3V, preventing latch-up or gate oxide rupture in downstream 3.3V/5V logic. | Use Scenario: Shields LIN bus transceivers and window motor drivers from battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS on VBAT rail, absorbing 40A surge within 8.3ms without degradation. Use Value: Maintains system uptime by surviving >1000 surge events per AEC-Q200 Class D requirements. |
| Telecom Interface Protection | Medical Equipment Power Input |
Use Scenario: Guards RS-485 transceiver power pins against induced surges from nearby AC wiring or relay switching. IC Role / Device Role / Timing Role: Secondary protection layer after common-mode chokes, clamping differential-mode transients. Use Value: Achieves <100nA leakage at 33V, preserving signal integrity and minimizing standby current drain. | Use Scenario: Secures isolated DC power entry of patient-monitoring devices against hospital-grade power anomalies. IC Role / Device Role / Timing Role: Final-stage TVS on secondary-side 12V rail, meeting IEC 60601-1 creepage and surge immunity. Use Value: Operates reliably at +150°C junction temperature, supporting sealed enclosure thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-13 | Bi-directional version; symmetrical clamping for AC or bidirectional signal lines | Required where reverse polarity or AC-coupled signals need protection (e.g., USB D+/D–) | Select only if circuit lacks inherent polarity or handles bidirectional data |
| P6SMB33A-T | Same VRWM and VC but 600W PPK rating; larger SMB package (7.1mm × 6.2mm) | Better thermal mass for high-duty-cycle surges; requires more PCB area | Prefer when surge repetition rate exceeds 4 pulses/minute or ambient >75°C |
Compared with SMAJ33CA-13, the unidirectional SMAJ33A-13 offers lower leakage and tighter VBR tolerance; versus P6SMB33A-T, it trades peak power for compactness - optimal for space-constrained 24V industrial nodes.
Availability
SMAJ33A-13 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, telecom interface protection, and medical equipment power input requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ33A-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and communications systems where compact size and repeatable clamping are critical.
FAQ
What is the maximum clamping voltage of SMAJ33A-13 at its rated peak pulse current?
The maximum clamping voltage (VC) is 53.3V at 7.5A peak pulse current (Ipp), measured under the standard 8.3ms half-sine waveform defined by JEDEC. This value guarantees that downstream components see no more than 53.3V during a full-rated transient event, provided layout minimizes parasitic inductance.
Does SMAJ33A-13 support lead-free reflow soldering?
Yes - SMAJ33A-13 features matte tin plating and is rated for lead-free reflow per J-STD-020C Level 1 moisture sensitivity. Its maximum peak reflow temperature is 260°C, compatible with standard Pb-free SAC305 profiles, and it carries RoHS compliance under EU Directive Annex exemptions.
How does the unidirectional configuration affect circuit placement?
The unidirectional SMAJ33A-13 must be oriented with its cathode toward the higher-potential side of the protected line (e.g., VCC or signal rail) and anode to ground or return. Reversal causes forward conduction during normal operation, leading to excessive leakage and potential thermal runaway.
Can SMAJ33A-13 replace SMAJ33CA-13 in a bi-directional signal line?
No - SMAJ33A-13 is unidirectional and will conduct continuously if reverse-biased, causing failure. The SMAJ33CA-13 variant has symmetrical breakdown in both directions and is required for AC-coupled or polarity-agnostic lines like CAN or USB. Substitution requires schematic and layout revision.
SMAJ33A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- SMA
SMAJ33A-13 FAQ
1.How can I place an order for SMAJ33A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33A-13 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-13 reliable?
The price and inventory of SMAJ33A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ33A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33A-13?
SMAJ33A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33A-13 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-13?
For technical support, including SMAJ33A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33A-13 requirements.
6.How does Aetrix verify that SMAJ33A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ33A-13 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-13 meets industry standards.
7.What is the process for return or replacement of SMAJ33A-13?
All SMAJ33A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33A-13, 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-13 part is unused and in its original packaging.
Return procedure for SMAJ33A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33A-13 Tags
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