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Vishay General Semiconductor - Diodes Division SMAJ22CA-E3/5A
- Part No.:
- SMAJ22CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CA-E3/5A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,661
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Product details
Overview
SMAJ22CA-E3/5A 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 and power lines. It features a 22 V standoff 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial electronics.
For engineers reviewing the SMAJ22CA-E3/5A datasheet, SMAJ22CA-E3/5A pinout, SMAJ22CA-E3/5A application, or SMAJ22CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification eligibility (via HE3/HM3 variants), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device across two terminals with symmetrical bidirectional avalanche behavior. Its glass-passivated junction enables fast response (<1 ps), low incremental surge resistance, and stable breakdown under repetitive 10/1000 μs transients at 0.01% duty cycle.
The device is rated for -55 °C to +150 °C operating junction temperature, exhibits 0.096 %/°C temperature coefficient of VBR, and delivers 35.5 V clamping at 11.3 A IPPM while maintaining ≤1.0 μA reverse leakage at 22 V - critical for low-power sensor line protection where leakage-induced offset must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse working voltage before conduction begins; defines upper limit for normal circuit operation. |
| VBR min/max | 24.4 V / 26.9 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 35.5 V at 11.3 A - clamped voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components. |
| PPPM | 400 W - peak pulse power handling per 10/1000 μs waveform on 5.0 mm × 5.0 mm copper pads; defines transient energy absorption capacity. |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine); relevant only for unidirectional variants; not applicable here (bidirectional). |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - standardized surface-mount outline with 2.54 mm lead pitch; compatible with JEDEC MS-013 and IPC-7351B footprints. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak), polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking; either terminal serves as anode or cathode depending on transient polarity - enables single-device protection of AC or floating DC lines. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic rails within safe margin during ESD/EFT events. |
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics over temperature and lifetime; eliminates risk of junction oxidation or parameter drift. |
| MSL Level 1 compliance | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking - reduces manufacturing complexity and cost. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are qualified for automotive applications; enables drop-in use in ADAS, body control, and infotainment systems. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail to shunt transient energy before it reaches sensitive analog-to-digital converters or communication ICs. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while adding <1 pF capacitance - avoids bandwidth degradation in 100 kHz sensor signals. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Standoff-connected TVS between input terminal and ground, activated only during >22 V excursions to prevent op-amp saturation or ADC latch-up. Use Value: Enables robust Class II industrial immunity (IEC 61000-4-5 Level 3: 2 kV surge) without requiring active clamping circuitry or precision Zener networks. |
| Consumer IoT Power Rail Clamping | Telecom Ethernet PHY Protection |
Use Scenario: Securing 3.3 V/5 V DC-DC converter outputs in smart home hubs and battery-powered edge devices against ESD and hot-swap transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on VOUT rail to clamp overshoot during startup, short-circuit recovery, or connector hot-plug events. Use Value: Limits output overvoltage to ≤35.5 V, preventing damage to connected SoCs and PMICs while consuming zero quiescent current during normal operation. |
Use Scenario: Protecting RJ45 magnetics and Ethernet PHY ICs (e.g., Marvell 88E1512) from lightning-induced surges and cable discharge events in enterprise switches and PoE injectors. IC Role / Device Role / Timing Role: Common-mode TVS placed across transformer center taps or differential pairs to suppress longitudinal surges without affecting 100 MHz signal integrity. Use Value: Provides 400 W surge handling aligned with IEEE 802.3bt Type 4 PoE requirements while maintaining <0.5 dB insertion loss up to 250 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5A | Unidirectional variant; includes cathode band marking; identical VWM, VBR, VC, and PPPM specs but asymmetric conduction. | Required only where DC bias polarity is fixed and reverse conduction must be blocked (e.g., protecting positive-only supply rails). | Select SMAJ22A-E3/5A only if system architecture mandates unidirectional blocking - otherwise SMAJ22CA-E3/5A offers broader flexibility for AC-coupled or floating lines. |
| SMBJ22CA-E3/52 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package; 600 W PPPM; larger footprint (4.58 mm × 3.94 mm vs. 4.50 mm × 2.79 mm). | Used where higher surge margin is needed and PCB space allows larger package; not pin-compatible due to different pad layout and lead spacing. | Choose SMBJ22CA-E3/52 only when design requires >400 W surge rating and layout accommodates 25% larger footprint - SMAJ22CA-E3/5A remains optimal for space-constrained SMT designs. |
Compared with SMAJ22A-E3/5A, SMAJ22CA-E3/5A eliminates polarity dependency and simplifies BOM management for mixed-signal boards; compared with SMBJ22CA-E3/52, it trades 200 W peak power for 30% smaller area and full compatibility with fine-pitch automated placement equipment.
Availability
SMAJ22CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input conditioning, and consumer IoT power rail clamping requiring stable component supply, RoHS-compliant sourcing, and tape-and-reel delivery for high-volume SMT production.
Supply support for SMAJ22CA-E3/5A 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure tolerance, thermal stability, and long-term parametric consistency are mandatory.
FAQ
What is the maximum clamping voltage of SMAJ22CA-E3/5A at its rated peak pulse current?
The SMAJ22CA-E3/5A has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees that protected circuits will not experience more than 35.5 V during specified surge events - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces. The SMAJ22CA-E3/5A maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ22CA-E3/5A suitable for automotive applications?
SMAJ22CA-E3/5A itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101-qualified versions under HE3 and HM3 suffixes (e.g., SMAJ22CAHE3_A/I). These variants undergo stress testing per AEC-Q101 including HTGB, HTRB, and TCT, making them suitable for automotive powertrain, chassis, and body electronics. The SMAJ22CA-E3/5A shares identical electrical specs and package dimensions - enabling direct migration to qualified variants without layout changes when automotive qualification is required.
How does the bidirectional configuration of SMAJ22CA-E3/5A affect its circuit implementation?
The bidirectional configuration of SMAJ22CA-E3/5A means it conducts symmetrically in both polarities - no cathode marking is present, and either terminal functions identically. This allows placement across AC-coupled lines, floating differential pairs (e.g., RS-485, CAN), or ungrounded power rails without concern for orientation. Unlike unidirectional TVS diodes, SMAJ22CA-E3/5A eliminates risk of incorrect mounting and supports simplified schematic symbol usage - the SMAJ22CA-E3/5A is ideal for designs where voltage transients may occur with either polarity relative to ground.
What is the thermal resistance of SMAJ22CA-E3/5A, and how does it impact power derating?
SMAJ22CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended PCB pads. At ambient temperatures above 25 °C, its 3.3 W steady-state power dissipation (PD) must be linearly derated - for example, at 75 °C ambient, maximum allowable PD drops to 1.65 W. This derating directly affects sustained leakage current handling but does not impact transient surge capability, which relies on thermal mass rather than steady-state conduction. The SMAJ22CA-E3/5A's RθJA value is validated per JESD51-2 test conditions.
Can SMAJ22CA-E3/5A be used in place of SMAJ22A-E3/5A without circuit modification?
Yes - SMAJ22CA-E3/5A can replace SMAJ22A-E3/5A in most applications because both share identical VWM (22 V), VBR (24.4–26.9 V), VC (35.5 V), and package (SMA/DO-214AC). However, SMAJ22CA-E3/5A conducts in both directions, so it should not be used where reverse conduction must be blocked (e.g., protecting a single-polarity supply rail with strict reverse-current limits). In all other cases - especially AC, differential, or floating nodes - the SMAJ22CA-E3/5A provides greater design flexibility and eliminates orientation-dependent assembly errors.
SMAJ22CA-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ22CA-E3/5A FAQ
1.How can I place an order for SMAJ22CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CA-E3/5A 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 SMAJ22CA-E3/5A reliable?
The price and inventory of SMAJ22CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CA-E3/5A?
SMAJ22CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CA-E3/5A 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 SMAJ22CA-E3/5A?
For technical support, including SMAJ22CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ22CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22CA-E3/5A 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 SMAJ22CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22CA-E3/5A?
All SMAJ22CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CA-E3/5A, 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 SMAJ22CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ22CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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