My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ22A-M3/61
- Part No.:
- SMAJ22A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22A-M3/61.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,355
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ22A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics 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.
For engineers reviewing the SMAJ22A-M3/61 datasheet, SMAJ22A-M3/61 pinout, SMAJ22A-M3/61 application, or SMAJ22A-M3/61 equivalent, key selection criteria include clamping performance under 11.3 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and suitability for automotive-grade designs when paired with AEC-Q101-qualified variants.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>1 μA leakage at 22 V), but triggers into low-impedance conduction within <1 ps when reverse voltage exceeds VBR, clamping transient energy to ≤35.5 V. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability across -55 °C to +150 °C operating range.
The device uses a planar silicon avalanche structure optimized for repetitive 10/1000 μs surge events at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above). Mounting on 5.0 mm × 5.0 mm copper pads per terminal achieves specified thermal and power dissipation performance, with RθJL = 30 °C/W enabling effective heat transfer to PCB traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal line operating margin. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 10/1000 μs surge; determines protected IC's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates survivability during accidental forward faults. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial ambient environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs minimum copper area required for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance reference plane; completes shunt path during transient suppression. |
| Cathode | Reverse-biased input / Protected line connection | Connected to signal/power line requiring protection; reverse voltage applied here triggers clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity requirements up to Level 4 (4 kV line-to-earth). |
| 35.5 V clamping voltage at 11.3 A | Limits voltage stress on downstream 24 V-rated ICs (e.g., CAN transceivers, microcontrollers) during surge events. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for industrial and automotive end equipment without compromising performance. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly processes without moisture-related popcorning or delamination risk. |
| AEC-Q101 qualification available | Enables drop-in use in automotive applications when ordered as HM3 variant (e.g., SMAJ22AHM3_X), validated for reliability. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply rails in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VBAT and chassis ground, triggered within picoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤35.5 V during 100 A/100 ms load dump events, preventing damage to PMICs and MCU power inputs. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional or unidirectional clamp on differential or single-ended signal lines exposed to EMI and cable discharge. Use Value: Maintains signal integrity below 35.5 V clamping threshold while adding <1 pF junction capacitance, avoiding bandwidth degradation. |
| Telecom DC Power Input Protection | Consumer USB Port ESD Protection |
|
Use Scenario: Securing 24–48 V DC inputs of PoE-powered network switches and base station radios. IC Role / Device Role / Timing Role: Primary front-end TVS on input bulk capacitor node, absorbing multi-kW lightning-induced surges. Use Value: Withstands 400 W peak pulse energy and 11.3 A surge current, reducing need for secondary protection stages. |
Use Scenario: ESD hardening of VBUS and D+/D- lines in USB-C receptacles for portable audio/video devices. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line; cathode tied to VBUS, anode to ground. Use Value: Provides ±30 kV HBM ESD protection (IEC 61000-4-2) with sub-1 ps response, preserving USB 2.0 signal rise time. |
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; RoHS-compliant but not halogen-free (E3 vs M3). | Preferred for commercial-grade non-automotive applications where halogen content is unrestricted. | Select E3 for cost-sensitive consumer designs; M3 required for halogen-free compliance in EU/Asia markets. |
| SMAJ22AHM3_A | Identical clamping and surge ratings; AEC-Q101 qualified, halogen-free, with revision-coded packaging. | Qualified for automotive ECUs, ADAS sensors, and infotainment systems requiring automotive reliability validation. | Choose HM3_A for automotive production; SMAJ22A-M3/61 remains optimal for industrial/commercial use with same footprint. |
Compared with SMAJ22A-E3/61, the M3/61 offers halogen-free compliance without sacrificing surge capability; versus SMAJ22AHM3_A, it lacks AEC-Q101 qualification but retains identical electrical performance and packaging-making it ideal for non-automotive applications requiring environmental compliance and cost efficiency.
Availability
SMAJ22A-M3/61 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, telecom power inputs, and consumer USB protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ22A-M3/61 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 was developed for high-energy transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and telecom systems needing robust, standardized TVS protection with repeatable clamping behavior.
FAQ
What is the maximum clamping voltage of SMAJ22A-M3/61 under a 10/1000 μs surge?
The SMAJ22A-M3/61 has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ22A-M3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), ensuring consistent protection in harsh environments.
Is SMAJ22A-M3/61 suitable for automotive applications?
SMAJ22A-M3/61 is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the SMAJ22AHM3_X variant (e.g., SMAJ22AHM3_A), which shares identical electrical specs and package but adds AEC-Q101 validation. The SMAJ22A-M3/61 remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, such as aftermarket infotainment or lighting modules.
How does the M3 suffix differ from E3 in SMAJ22A-M3/61?
The M3 suffix indicates halogen-free, RoHS-compliant construction, whereas E3 denotes RoHS-compliant but non-halogen-free material. Both share identical electrical characteristics, thermal performance, and mechanical dimensions. The SMAJ22A-M3/61 meets stricter environmental regulations in regions mandating halogen-free materials (e.g., certain EU and Asian standards), while SMAJ22A-E3/61 serves general commercial applications where halogen content is unrestricted.
What is the thermal resistance of SMAJ22A-M3/61, and how does it affect PCB layout?
SMAJ22A-M3/61 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. To maintain safe junction temperatures under sustained power dissipation, designers must allocate sufficient copper area and consider airflow. Reducing pad size or omitting thermal vias increases RθJA, potentially exceeding the +150 °C TJ max. The SMAJ22A-M3/61 datasheet specifies exact pad layout dimensions to achieve rated thermal performance.
Can SMAJ22A-M3/61 be used for bidirectional transient protection?
No - SMAJ22A-M3/61 is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay offers the SMAJ22CA series (e.g., SMAJ22CA-M3/61), which provides symmetrical clamping in both polarities. Using SMAJ22A-M3/61 in bidirectional configurations risks forward conduction during negative transients, leading to failure. Always match device polarity (A = unidirectional, CA = bidirectional) to system signal topology.
SMAJ22A-M3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22A-M3/61 FAQ
1.How can I place an order for SMAJ22A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22A-M3/61 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 SMAJ22A-M3/61 reliable?
The price and inventory of SMAJ22A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ22A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22A-M3/61?
SMAJ22A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22A-M3/61 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 SMAJ22A-M3/61?
For technical support, including SMAJ22A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22A-M3/61 requirements.
6.How does Aetrix verify that SMAJ22A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ22A-M3/61 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 SMAJ22A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ22A-M3/61?
All SMAJ22A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22A-M3/61, 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 SMAJ22A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ22A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22A-M3/61 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 …
