My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ33CAHM3_A/H
- Part No.:
- SMAJ33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAHM3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,925
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ33CAHM3_A/H 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 at 7.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ33CAHM3_A/H datasheet, SMAJ33CAHM3_A/H pinout, SMAJ33CAHM3_A/H application, or SMAJ33CAHM3_A/H equivalent, this device is selected for robust ESD and surge protection in automotive sensor interfaces, industrial I/O ports, and telecom line receivers where bidirectional clamping, low leakage (<1.0 μA at 33 V), and AEC-Q101 qualification are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 36.7 V and 40.6 V at 1 mA test current. Its clamping behavior is defined under standardized 10/1000 μs surge conditions, delivering consistent VC ≤ 53.3 V up to IPPM = 7.5 A.
The device uses a glass-passivated silicon junction, supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C. It is halogen-free, RoHS-compliant, and AEC-Q101 qualified - denoted by the "HM3" suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 36.7 V / 40.6 V at IT = 1 mA - Ensures reliable breakdown onset within tight tolerance band |
| VC @ IPPM | 53.3 V at 7.5 A - Clamped voltage during 10/1000 μs transient, limiting stress on downstream ICs |
| PPPM | 400 W - Peak surge power handling capability under standard lightning-surge waveform |
| ID @ VWM | <1.0 μA - Ultra-low reverse leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables use in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts surge current when voltage falls below –VBR; symmetrical to cathode in bidirectional mode |
| Cathode | Transient current entry (positive half-cycle) | Conducts surge current when voltage exceeds +VBR; no band marking on SMAJ33CAHM3_A/H |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for EU, China RoHS, and JEITA standards |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio suppressors |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Port |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching PHY layer. Use Value: Maintains signal fidelity under ±33 V common-mode noise while surviving repetitive 400 W surges per ISO 16750-2. |
Use Scenario: Shielding PLC digital input modules from inductive kickback and EFT bursts on 24 V DC field wiring. IC Role / Device Role / Timing Role: Primary transient suppression stage upstream of optocoupler or Schmitt-trigger input conditioning. Use Value: Limits voltage excursion to ≤53.3 V during 10/1000 μs surges, preventing latch-up in microcontroller GPIOs. |
| Telecom Line Receiver | Consumer USB Power/Data Line |
|
Use Scenario: Safeguarding Ethernet PHY or RS-485 transceivers against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level protection aligned with IEC 61000-4-5, coordinated with gas discharge tube (GDT) front-end. Use Value: Fast response (<1 ps) and low clamping enable compliance with GR-1089-CORE telecom immunity requirements. |
Use Scenario: Adding surge resilience to USB Type-A/C VBUS and D+/D– lines in portable docking stations and chargers. IC Role / Device Role / Timing Role: Low-capacitance (≈250 pF) bidirectional clamp minimizing signal distortion on high-speed data lanes. Use Value: Prevents damage from human-body-model (HBM) ESD events up to ±15 kV while preserving USB 2.0 eye diagram integrity. |
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/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Acceptable for commercial/industrial use where automotive qualification is not mandated | Select when cost sensitivity outweighs halogen-free or automotive-grade requirements |
| SMBJ33CAHM3_A/H | Same VWM/VBR/VC, but SMB (DO-214AA) package - 25 % larger footprint, 600 W PPPM rating | Better suited for higher-energy surges where PCB space permits larger package | Choose when system-level surge testing exceeds 400 W or thermal margin requires lower RθJA |
Compared with SMAJ33CAHM3_A/H, SMAJ33CAHE3_A/H offers identical clamping performance at lower cost but excludes halogen-free and AEC-Q101 compliance; SMBJ33CAHM3_A/H provides higher surge capacity in a larger package, enabling longer lifetime under repetitive stress.
Availability
SMAJ33CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line receiver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ33CAHM3_A/H 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 and application-specific validation.
The SMAJ series targets board-level transient suppression in automotive, industrial, and telecom systems, engineered for fast response, repeatable clamping, and robust reflow survivability.
FAQ
What is the clamping voltage of SMAJ33CAHM3_A/H at its rated peak pulse current?
The SMAJ33CAHM3_A/H exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current (IPPM) of 7.5 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for protected circuitry downstream of the device.
Is SMAJ33CAHM3_A/H suitable for automotive applications?
Yes, SMAJ33CAHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via the "HM3" suffix. It meets stringent requirements for temperature cycling, humidity resistance, and surge endurance - making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under harsh conditions is critical.
How does the bidirectional configuration of SMAJ33CAHM3_A/H affect its usage in circuit design?
The bidirectional configuration of SMAJ33CAHM3_A/H allows symmetric clamping of both positive and negative transients without polarity sensitivity. Unlike unidirectional variants, it requires no cathode marking on PCB silkscreen and simplifies layout in AC-coupled or differential signal paths such as RS-485, CAN, or audio lines where voltage swings occur in both directions.
What is the thermal resistance of SMAJ33CAHM3_A/H, and how does it impact PCB layout?
SMAJ33CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2"). To maintain safe junction temperatures under repeated surges, designers should implement adequate copper pour area and avoid thermally isolating the SMA pads - especially in high-temperature ambient environments like automotive under-hood locations.
Does SMAJ33CAHM3_A/H meet RoHS and halogen-free compliance standards?
Yes, SMAJ33CAHM3_A/H carries the "HM3" suffix indicating full compliance with RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, satisfying environmental mandates for consumer, industrial, and automotive end equipment.
SMAJ33CAHM3_A/H 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/H FAQ
1.How can I place an order for SMAJ33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAHM3_A/H 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/H reliable?
The price and inventory of SMAJ33CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAHM3_A/H?
SMAJ33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAHM3_A/H 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/H?
For technical support, including SMAJ33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ33CAHM3_A/H?
All SMAJ33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CAHM3_A/H 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 …
