My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ33AHE3/5A
- Part No.:
- SMAJ33AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33AHE3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,563
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ33AHE3/5A 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 SMAJ33AHE3/5A datasheet, SMAJ33AHE3/5A pinout, SMAJ33AHE3/5A application, or SMAJ33AHE3/5A equivalent, key selection criteria include clamping performance under 7.5 A surge, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, responding to voltage transients exceeding its reverse stand-off threshold (33 V) by entering low-impedance conduction to shunt surge energy to ground. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the SMA package supports high-density PCB layouts and meets J-STD-020 MSL level 1 reflow requirements.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), operates across –55 °C to +150 °C junction temperature range, and exhibits a positive temperature coefficient of VBR (+0.100 %/°C), enabling predictable voltage margining in thermal-varying environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC bias margin for protected circuitry. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Verified breakdown range ensuring reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 53.3 V at 7.5 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; validates protection against IEC 61000-4-5 Level 3 surges. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on recommended 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive and high-temperature industrial enclosures. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability per stress test requirements including HTGB, HTRB, and temperature cycling. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to protected line (e.g., 33 V rail or signal trace); conducts during reverse transient when cathode is held at higher potential. |
| Cathode | Clamp reference / Ground reference | Connected to system ground or low-impedance return path; establishes clamping threshold relative to this node; marked with band. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces requiring long-term reliability under thermal and mechanical stress. |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 7.5 A without degradation - sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 combination wave testing. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 μA at 33 V), critical for low-power sensor nodes and battery-backed systems. |
| MSL level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake requirements and supporting high-yield automated assembly. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during surge events - protects 3.3 V and 5 V logic interfaces even when placed downstream of series impedance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 33 V supply lines in engine control units (ECUs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp absorbing >400 W surge energy within nanoseconds to prevent MOSFET gate oxide failure and microcontroller brownout. Use Value: Maintains system uptime by limiting rail voltage to ≤53.3 V during 7.5 A transients - compatible with 60 V-rated power management ICs and gate drivers. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response surge shunt placed between signal conductor and chassis ground, preserving signal integrity during ESD and lightning-induced surges. Use Value: Clamps transients before they reach precision DACs or op-amps - leakage <1 μA avoids offset errors in μA-level current loop circuits. |
| Consumer Device USB Port Protection | Telecom Base Station DC Feed Protection |
Use Scenario: Secondary overvoltage protection on VBUS line of USB-C ports in portable monitors and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS backing up integrated USB port protectors, triggered only during extreme surges beyond primary IC's capability. Use Value: Adds fail-safe layer with 33 V VWM matching USB PD 3.0 27 W profiles - prevents latch-up in USB controller ICs during hot-plug induced spikes. | Use Scenario: Protecting 48 V DC feed lines powering remote radio units (RRUs) in 4G/5G base stations against lightning-induced surges. IC Role / Device Role / Timing Role: High-energy TVS mounted at RRU input connector, diverting multi-kA transients before reaching DC-DC converters and FEMs. Use Value: Withstands repeated 400 W pulses without parameter shift - validated for outdoor telecom deployments with >20-year service life expectations. |
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 AEC-Q101 qualification; differs only in RoHS compliance marking (E3 vs HE3) and packaging tape width (5A = 13" reel). | No functional difference; suitable for commercial-grade automotive programs where AEC-Q101 is not mandated. | Select SMAJ33AHE3/5A when full automotive qualification documentation and traceability are required. |
| SMBJ33AHE3/5A | 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; requires larger PCB footprint and may not fit space-constrained modules. | Choose SMBJ33AHE3/5A for higher-reliability industrial power supplies where layout space permits and 600 W surge headroom is needed. |
Compared with SMAJ33A-E3/5A, the SMAJ33AHE3/5A provides identical protection performance with certified automotive qualification and traceable sourcing; versus SMBJ33AHE3/5A, it trades 200 W pulse power headroom for 30 % smaller board area and tighter thermal coupling to PCB copper.
Availability
SMAJ33AHE3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC feed protection requiring stable component supply across extended production lifecycles.
Supply support for SMAJ33AHE3/5A 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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and load dump is mission-critical.
FAQ
What is the clamping voltage of SMAJ33AHE3/5A at its rated peak pulse current?
The SMAJ33AHE3/5A has a maximum clamping voltage (VC) of 53.3 V at 7.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components like microcontrollers or gate drivers remain within safe operating limits. The SMAJ33AHE3/5A maintains this clamping performance across its qualified temperature range.
Is SMAJ33AHE3/5A suitable for automotive applications?
Yes, SMAJ33AHE3/5A is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias, temperature cycling, and humidity testing required for automotive electronic components. Its construction - glass-passivated junction, matte tin-plated leads, and MSL level 1 rating - supports under-hood and body-control module deployment. The SMAJ33AHE3/5A is explicitly designated for automotive use via its "HE3" suffix per Vishay's ordering nomenclature.
What is the standoff voltage and breakdown range for SMAJ33AHE3/5A?
The SMAJ33AHE3/5A has a reverse stand-off voltage (VWM) of 33 V and a breakdown voltage (VBR) range of 36.7 V to 40.6 V at 1 mA test current. This 3.9 V margin between VWM and minimum VBR ensures no conduction during normal operation while guaranteeing reliable avalanche initiation during transients. The SMAJ33AHE3/5A's specified VBR tolerance aligns with industry standards for transient suppressors used in safety-critical power domains.
How does the thermal performance of SMAJ33AHE3/5A affect PCB layout?
The SMAJ33AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain junction temperature below 150 °C during repetitive surges, designers must ensure adequate copper area and avoid excessive ambient heating. The SMAJ33AHE3/5A's low-profile SMA package allows tight placement near connectors or ICs but requires adherence to Vishay's recommended pad layout to achieve rated thermal and surge performance.
What packaging configuration does SMAJ33AHE3/5A ship in?
SMAJ33AHE3/5A ships in 13-inch diameter plastic tape and reel format, with a base quantity of 7500 pieces per reel (package code "5A"). This configuration supports high-volume automated SMT assembly and is compatible with standard pick-and-place equipment. The "HE3" suffix confirms RoHS-compliant and AEC-Q101-qualified material content, while the "5A" denotes the reel size and orientation - distinct from the 7-inch "61" or "H" variants used for lower-volume or prototyping needs. The SMAJ33AHE3/5A reel meets J-STD-002 solderability and JESD22-B102 whisker resistance standards.
SMAJ33AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33AHE3/5A FAQ
1.How can I place an order for SMAJ33AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33AHE3/5A 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 SMAJ33AHE3/5A reliable?
The price and inventory of SMAJ33AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ33AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33AHE3/5A?
SMAJ33AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33AHE3/5A 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 SMAJ33AHE3/5A?
For technical support, including SMAJ33AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33AHE3/5A requirements.
6.How does Aetrix verify that SMAJ33AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ33AHE3/5A 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 SMAJ33AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ33AHE3/5A?
All SMAJ33AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33AHE3/5A, 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 SMAJ33AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ33AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33AHE3/5A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
