My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ22AHE3_A/H
- Part No.:
- SMAJ22AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHE3_A/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:12,315
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ22AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for circuit protection against ESD, lightning-induced surges, and inductive switching transients. It features a 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and I/O lines of automotive sensor modules and industrial control interfaces.
For engineers reviewing the SMAJ22AHE3_A/H datasheet, SMAJ22AHE3_A/H pinout, SMAJ22AHE3_A/H application, or SMAJ22AHE3_A/H equivalent, this device is evaluated for robust overvoltage immunity in AEC-Q101-qualified automotive subsystems, low-leakage (<1.0 μA at VWM) signal line protection, and thermal reliability under repetitive surge conditions up to 150 °C junction temperature.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 22 V, it avalanches at VBR = 24.4–26.9 V and clamps transients to ≤35.5 V at 11.3 A, limiting energy dissipation via low incremental surge resistance. Its glass-passivated junction ensures stable leakage (<1.0 μA) and fast response time (<1 ns), critical for safeguarding MOSFET gates and microcontroller I/O pins.
Rated for 400 W peak pulse power (10/1000 μs), derated to 300 W above 78 V, it sustains repetitive surges at 0.01 % duty cycle. The SMA (DO-214AC) package provides MSL Level 1 moisture sensitivity and 260 °C lead-free solder compatibility, supporting automated SMT assembly in high-reliability automotive and industrial PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 22 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 24.4–26.9 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 35.5 V at IPPM = 11.3 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Energy-handling capacity for standard 10/1000 μs transient; enables protection against IEC 61000-4-5 Level 3 surges. |
| IPPM (Peak Pulse Current) | 11.3 A - Maximum non-repetitive surge current supported at rated clamping voltage; defines minimum trace width and fuse coordination. |
| TJmax | 150 °C - Maximum junction temperature; supports operation in under-hood automotive environments without thermal derating loss. |
| Leakage (ID) | <1.0 μA at 22 V - Ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor circuits. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); meets UL 94 V-0 flammability rating and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to ground or low-impedance return path; establishes reference for clamping action during positive transients on cathode side. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 24 V supply rail or CAN_H); conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5-compliant surge immunity up to 1 kV open-circuit / 500 A short-circuit test levels in industrial and automotive systems. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage drift over 15+ year field life, critical for safety-critical sensor front-ends. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow without popcorn cracking or parametric shift - eliminates post-solder screening in high-volume manufacturing. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected ICs like MCUs and transceivers. |
Applications
| Automotive Sensor Protection | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply and analog output lines of wheel speed sensors and pressure transducers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between sensor VCC and ground, clamping transients within 1 ns to prevent MCU reset or ADC saturation. Use Value: Maintains <1.0 μA leakage at 24 V to avoid sensor bias error while surviving 400 W surges per ISO 16750-2 Clause 4.7. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers subjected to relay coil flyback and EFT bursts. IC Role / Device Role / Timing Role: Standoff-rated TVS on each optocoupler input line, absorbing 10/1000 μs surges before they reach isolation barrier. Use Value: Clamps to 35.5 V at 11.3 A, ensuring input stage remains below absolute maximum ratings of 36 V-rated Schmitt triggers. |
| Telecom Power Rail Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Guarding PoE-powered Ethernet switch port DC-DC converter inputs against induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage TVS on 48 V input rail, coordinated with upstream fuses to clear faults without damaging DC/DC controller. Use Value: 400 W rating handles 10/1000 μs surges up to 1.5 kV (line-to-ground), meeting IEC 61000-4-5 Level 3 requirements. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machine control boards during PWM commutation. IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals, diverting flyback energy away from H-bridge MOSFETs and gate drivers. Use Value: 35.5 V clamping prevents VDS overstress on 60 V-rated MOSFETs, extending lifetime under repeated 40 A surge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/61 | Same electrical specs and SMA package, but commercial-grade (non-AEC-Q101 qualified); RoHS-compliant, no halogen restriction. | Lacks automotive qualification - unsuitable for under-hood or safety-critical ECUs; acceptable for consumer or industrial indoor use. | Select SMAJ22AHE3_A/H when AEC-Q101 compliance is mandatory; choose SMAJ22A-E3/61 for cost-sensitive non-automotive designs. |
| SMBJ22AHE3_A/H | Same AEC-Q101 qualification and VWM/VC specs, but SMB (DO-214AA) package - 5.3 mm × 4.1 mm footprint, 600 W PPPM. | Higher power handling enables longer surge duration immunity; larger footprint requires PCB layout change and higher thermal mass. | Choose SMBJ22AHE3_A/H only if 600 W capability is needed; SMAJ22AHE3_A/H fits space-constrained layouts where 400 W suffices. |
Compared with SMAJ22A-E3/61, SMAJ22AHE3_A/H adds AEC-Q101 qualification for automotive deployment; compared with SMBJ22AHE3_A/H, it trades 200 W peak power for 30 % smaller board area and identical thermal resistance (RθJA = 120 °C/W).
Availability
SMAJ22AHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC inputs, telecom power rails, and consumer appliance motor drives requiring stable component supply across extended production lifecycles.
Supply support for SMAJ22AHE3_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, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, low leakage, and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the clamping voltage of SMAJ22AHE3_A/H at its rated peak pulse current?
The SMAJ22AHE3_A/H has a maximum clamping voltage (VC) of 35.5 V at its rated peak pulse current (IPPM) of 11.3 A, measured with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ22AHE3_A/H maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMAJ22AHE3_A/H qualified for automotive applications?
Yes, SMAJ22AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering information and mechanical data sections. The "HE3" suffix denotes RoHS-compliant and AEC-Q101-qualified construction, making SMAJ22AHE3_A/H suitable for automotive powertrain, chassis, and body electronics where reliability under thermal cycling, humidity, and surge stress is mandated. This qualification is distinct from commercial-grade variants like SMAJ22A-E3/61.
What does the "_A/H" suffix mean in SMAJ22AHE3_A/H?
The "_A/H" suffix in SMAJ22AHE3_A/H indicates packaging configuration: "H" specifies a 7-inch diameter plastic tape-and-reel format with 1800 units per reel, while "A" denotes the revision code per Vishay's ordering nomenclature. This matches the preferred package code "H" and base quantity "1800" listed in the Ordering Information table. The SMAJ22AHE3_A/H is not a functional variant - all electrical and thermal specs align with the base SMAJ22AHE3 family.
How does SMAJ22AHE3_A/H compare to bidirectional TVS diodes like SMAJ22CA?
SMAJ22AHE3_A/H is unidirectional and intended for DC line protection with defined polarity (cathode band marks the protected line), whereas SMAJ22CA is bidirectional and used for AC or differential signal lines. SMAJ22AHE3_A/H exhibits forward conduction (VF = 3.5 V at 25 A) and reverse clamping, while SMAJ22CA clamps symmetrically in both directions. Their VWM, VBR, and VC values differ - SMAJ22CA has VWM = 22 V but VBR = 24.4–26.9 V in both polarities, unlike SMAJ22AHE3_A/H's unidirectional behavior.
What is the thermal resistance of SMAJ22AHE3_A/H, and how does it affect PCB layout?
SMAJ22AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet. This value assumes minimum recommended pad layout; increasing copper area reduces RθJA and improves surge survivability. For sustained 3.3 W power dissipation, designers must ensure adequate copper pour and avoid thermal bottlenecks near the SMAJ22AHE3_A/H location to maintain TJ ≤ 150 °C.
SMAJ22AHE3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMAJ22AHE3_A/H FAQ
1.How can I place an order for SMAJ22AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHE3_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 SMAJ22AHE3_A/H reliable?
The price and inventory of SMAJ22AHE3_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 SMAJ22AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ22AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHE3_A/H?
SMAJ22AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHE3_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 SMAJ22AHE3_A/H?
For technical support, including SMAJ22AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ22AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHE3_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 SMAJ22AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ22AHE3_A/H?
All SMAJ22AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHE3_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 SMAJ22AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ22AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22AHE3_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 …
