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Diodes Incorporated SMAZ22-13
- Part No.:
- SMAZ22-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAZ22-13.pdf
- Description:
- DIODE ZENER 22V 1W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,814
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Product details
Overview
SMAZ22-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with a nominal zener voltage of 22.0V (±5%), 25mA maximum zener test current, 180Ω maximum zener impedance at IZT, and 0.5µA maximum reverse leakage at 16.7V. It is used for precision voltage regulation and overvoltage protection in DC power rails of industrial control modules.
For engineers reviewing the SMAZ22-13 datasheet, SMAZ22-13 pinout, SMAZ22-13 application, or SMAZ22-13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (RθJA = 100°C/W), power derating above +50°C, cathode polarity marking, and RoHS-compliant matte tin plating.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 22.0V nominal regulation is specified at IZT = 25mA with VZ range 20.9–23.1V and dynamic impedance ≤180Ω.
Thermal performance is defined for FR-4 PCB mounting (1" × 0.85", 0.062" thick) with RθJT = 30°C/W and RθJA = 100°C/W; power dissipation derates linearly at 10mW/°C above +50°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.0V nominal, 20.9–23.1V range at IZT = 25mA - defines stable regulation point under load |
| Power Dissipation (PD) | 1.0W at TA = +25°C - sets maximum continuous DC power handling on standard PCB |
| Zener Impedance (ZZT) | ≤180Ω at IZT = 25mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | ≤0.5µA at VR = 16.7V - ensures minimal quiescent current in standby regulation circuits |
| Thermal Resistance (RθJA) | 100°C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design margin |
| Package | SMA (DO-214AC) - surface-mount outline with cathode band, compatible with automated reflow assembly |
| RoHS Compliance | Lead-free, halogen- and antimony-free "Green" device - meets EU Directive 2011/65/EU requirements |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode identified by band or notch, weight ≈0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node during reverse-biased regulation |
| Cathode | Zener regulation terminal / high-voltage side | Connected to input rail; maintains regulated voltage drop across load when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| 1.0W Power Rating | Enables robust voltage clamping in 24V industrial supply rails without external heat sinking |
| ±5% Zener Tolerance | Supports tight regulation accuracy in feedback loops of isolated DC-DC converters |
| Cathode Band Polarity Marking | Ensures unambiguous orientation during automated placement and visual inspection |
| Level 1 Moisture Sensitivity | Eliminates bake requirement prior to reflow, reducing manufacturing cycle time |
| Matte Tin Lead-Free Plating | Guarantees solderability per MIL-STD-202 Method 208 and compatibility with Pb-free assembly processes |
Applications
| Industrial Sensor Signal Conditioning | Programmable Logic Controller (PLC) Input Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for analog front-end amplifiers in 4–20mA loop-powered sensors. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage regulator to maintain fixed bias point for op-amp circuitry. Use Value: 22V regulation provides headroom above 20mA loop compliance voltage while minimizing self-heating error due to 1.0W rating. | Use Scenario: Clamping transient overvoltage on digital input channels exposed to field wiring surges. IC Role / Device Role / Timing Role: Two-terminal transient suppressor placed across input optocoupler terminals. Use Value: 22V breakdown threshold protects 24V-rated input circuitry without false triggering during normal operation. |
| DC-DC Converter Feedback Network | Automated Test Equipment (ATE) Power Rail Monitoring |
Use Scenario: Providing precise voltage reference for TL431-based feedback in isolated flyback converters. IC Role / Device Role / Timing Role: Secondary-side shunt reference establishing output voltage setpoint via resistor divider. Use Value: ±5% VZ tolerance and low ZZT ensure <±1% output regulation accuracy under line/load variation. | Use Scenario: Monitoring 24V system rail integrity in rack-mounted ATE chassis with discrete comparator circuits. IC Role / Device Role / Timing Role: Stable voltage reference against which rail voltage is compared for fault detection. Use Value: Low 0.5µA leakage at 16.7V enables high-impedance sensing without loading the monitored rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22-7-F | 350mW rating, SOT-23 package, 22V ±5%, ZZT ≤ 50Ω @ 5mA | Lower power handling; suited for low-current bias networks, not rail clamping | Select for space-constrained designs where 1.0W dissipation is unnecessary |
| 1N4744A | 1.0W DO-41 through-hole package, 22V ±5%, ZZT ≤ 20Ω @ 11mA | Requires manual or wave soldering; incompatible with SMT-only production | Select only if legacy through-hole assembly is mandated or thermal mass requirement exceeds SMA limits |
Compared with BZX84-C22-7-F and 1N4744A, SMAZ22-13 uniquely balances 1.0W SMT power capability, industry-standard SMA footprint, and tight regulation for industrial 24V systems requiring automated assembly and thermal reliability.
Availability
SMAZ22-13 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, PLC input protection, DC-DC converter feedback networks, and ATE power rail monitoring requiring stable component supply and full traceability.
Supply support for SMAZ22-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in California, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMAZ series belongs to Diodes' surface-mount Zener diode product line, engineered specifically for high-reliability voltage regulation and transient suppression in industrial, automotive, and computing power systems.
FAQ
What is the maximum allowable junction temperature for SMAZ22-13?
The absolute maximum junction temperature is +150°C, as specified in the Electrical Characteristics table. Operation at this limit requires strict adherence to derating curves: power must be reduced by 10mW/°C above +50°C ambient, assuming standard FR-4 PCB mounting per Diodes' recommended pad layout.
Does SMAZ22-13 have a specified capacitance value?
No capacitance specification is provided in the DS18015 datasheet. Figure 2 shows typical total capacitance vs. reverse voltage for related SMAZ devices (e.g., SMAZ12, SMAZ27), but no numerical value is given for SMAZ22-13. Designers should treat it as unspecified unless measured or characterized separately.
Can SMAZ22-13 be used in place of a 24V Zener diode?
No - SMAZ22-13 is rated for 22.0V nominal regulation (20.9–23.1V range). For 24V applications, SMAZ24-13 (24.0V, 22.8–25.2V) is the correct variant. Substituting SMAZ22-13 would result in ~2V lower regulation, potentially causing undervoltage faults in 24V systems.
Is the cathode band the only polarity indicator on SMAZ22-13?
Yes - the datasheet specifies polarity is marked by either a cathode band or cathode notch. Visual inspection of production units confirms the band is the standard marking; no additional silkscreen or laser marking is used. The anode is the unmarked end opposite the band.
SMAZ22-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAZ22-13 FAQ
1.How can I place an order for SMAZ22-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAZ22-13 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 SMAZ22-13 reliable?
The price and inventory of SMAZ22-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAZ22-13 is usually 5 days.
3.What payment methods are accepted for SMAZ22-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAZ22-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAZ22-13?
SMAZ22-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAZ22-13 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 SMAZ22-13?
For technical support, including SMAZ22-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAZ22-13 requirements.
6.How does Aetrix verify that SMAZ22-13 is sourced from the original manufacturer or authorized distributors?
All SMAZ22-13 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 SMAZ22-13 meets industry standards.
7.What is the process for return or replacement of SMAZ22-13?
All SMAZ22-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAZ22-13, 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 SMAZ22-13 part is unused and in its original packaging.
Return procedure for SMAZ22-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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