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Diodes Incorporated SMAZ20-13-F
- Part No.:
- SMAZ20-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAZ20-13-F.pdf
- Description:
- DIODE ZENER 20V 1W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:147,173
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Product details
Overview
SMAZ20-13-F from Diodes Incorporated is a 1.0W surface-mount Zener diode with a nominal zener voltage of 20.0V (±5% tolerance), 25mA maximum zener test current, 180Ω maximum zener impedance at 15mA, and 0.5µA maximum reverse leakage at 15.2V. It uses an SMA package with cathode band polarity marking and is rated for operation from –65°C to +150°C. It is used for voltage regulation and overvoltage protection in DC power rails of industrial control modules.
For engineers reviewing the SMAZ20-13-F datasheet, SMAZ20-13-F pinout, SMAZ20-13-F application, or SMAZ20-13-F equivalent, key selection criteria include zener voltage accuracy at 25°C, thermal resistance (RθJA = 100°C/W), power derating above +50°C, reverse leakage at VR = 15.2V, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 1.0W power rating is specified at TA = +25°C and derates linearly at 10mW/°C above +50°C when mounted on a standard FR-4 board per Diodes Inc. layout guidelines.
The device exhibits low dynamic impedance (180Ω max at IZT = 15mA) and tight VZ tolerance (±5%), enabling precise clamping in feedback loops and analog sensing circuits. Its 0.064g weight and SMA footprint support high-density PCB layouts in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.0V nominal, 19.0–21.0V range at 25°C - defines clamping threshold in overvoltage protection circuits |
| Power Dissipation (PD) | 1.0W at TA = +25°C - supports continuous regulation in low-to-moderate current rails |
| Zener Test Current (IZT) | 25mA - operating point where VZ and ZZT are guaranteed per datasheet |
| Zener Impedance (ZZT) | ≤180Ω at IZT = 15mA - ensures minimal voltage deviation under dynamic load transients |
| Reverse Leakage (IR) | ≤0.5µA at VR = 15.2V - critical for low-power standby circuits where quiescent current must be minimized |
| Thermal Resistance (RθJA) | 100°C/W - determines junction temperature rise under given ambient and power conditions |
| Operating Temperature | –65°C to +150°C - suitable for under-hood automotive and industrial environments |
Pinout & Package
Package: SMA (Surface Mount Axial), molded plastic case (UL 94V-0), cathode identified by band marking. Dimensions: 4.00–4.60mm length (B), 2.29–2.92mm width (A), 1.27–1.63mm height (C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated rail; forms reference ground for shunt regulation |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to higher-potential side (e.g., supply rail); conducts when VR exceeds VZ to limit voltage |
Key Features
| Feature | Design Value |
|---|---|
| 1.0W Power Rating | Enables robust voltage clamping in 12–24V industrial power supplies without external heat sinking |
| ±5% Zener Tolerance | Reduces need for post-production trimming in precision reference designs |
| Lead-Free & Halogen-Free | Complies with RoHS 2 and JEDEC J-STD-020 moisture sensitivity Level 1 for reliable reflow assembly |
| SMA Package Compatibility | Supports high-speed pick-and-place placement and reflow soldering on standard SMT lines |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protects 24V digital input channels from ESD and load dump transients. IC Role / Device Role / Timing Role: Shunt clamping device placed between input line and ground to clamp spikes above 20V. Use Value: Limits transient voltage to ≤21V (max VZ), preventing damage to downstream logic-level interface ICs. | Use Scenario: Stabilizes reference voltage for sensor biasing in cabin temperature and humidity monitoring circuits. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC front-end conditioning networks. Use Value: Provides stable 20V reference with <0.5µA leakage, minimizing error contribution to 12-bit sensor measurements. |
| DC-DC Converter Feedback Network | Telecom Power Shelf Monitoring |
Use Scenario: Sets output voltage in isolated flyback converter feedback loop via optocoupler-coupled divider. IC Role / Device Role / Timing Role: Zener reference in secondary-side error amplifier circuit. Use Value: Maintains ±5% output regulation across line/load/temperature with low ZZT ensuring fast transient response. | Use Scenario: Monitors -48V telecom rack supply integrity using discrete voltage supervisor circuitry. IC Role / Device Role / Timing Role: Overvoltage detection element triggering shutdown when rail exceeds safe threshold. Use Value: Activates protection at 21V (VZ max), allowing margin below system's 22V absolute max rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20-7-F | 350mW rating, SOT-23 package, 20V ±5%, RθJA = 350°C/W | Limited to low-power signal-level clamping; unsuitable for >100mA load regulation | Select when board space is constrained and power dissipation remains <350mW |
| 1N4744A | 1.0W DO-41 through-hole package, 20V ±5%, RθJA ≈ 50°C/W with heatsink | Requires manual insertion or wave soldering; incompatible with fully SMT production | Select only for prototyping or legacy through-hole designs needing identical electrical specs |
Compared with BZX84-C20-7-F and 1N4744A, SMAZ20-13-F uniquely balances 1.0W SMT capability, industry-standard SMA footprint, and thermal performance (RθJA = 100°C/W) for automated manufacturing of mid-power industrial regulators.
Availability
SMAZ20-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive BCM sensor biasing, and DC-DC converter feedback networks requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAZ20-13-F 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 Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAZ series belongs to Diodes' high-reliability Zener diode product line, engineered specifically for stable voltage regulation and transient suppression in automotive, industrial, and telecom power systems.
FAQ
What is the maximum allowable reverse voltage before breakdown for SMAZ20-13-F?
The nominal zener voltage is 20.0V with a tolerance of ±5%, meaning breakdown occurs between 19.0V and 21.0V at the specified test current of 25mA. At lower currents (e.g., 1mA), the onset of measurable conduction begins near 18.5V, but full regulation is only guaranteed within the 19.0–21.0V band at IZT.
Can SMAZ20-13-F be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For >1.0W requirements, use a single higher-rated device (e.g., 3.0W SMA package variant) or implement active regulation instead.
Is the SMAZ20-13-F suitable for bidirectional ESD protection?
No - it is a unidirectional Zener diode optimized for reverse-bias regulation. For bidirectional ESD protection, use purpose-built TVS diodes such as the D1213 series, which feature symmetric clamping and specified IEC 61000-4-2 ratings.
How does ambient temperature affect the power rating of SMAZ20-13-F?
Its 1.0W rating applies only at TA = +25°C. Above +50°C, power must be linearly derated at 10mW/°C. At +100°C ambient, maximum allowable power drops to 0.5W. This derating assumes mounting on a standard FR-4 PCB per Diodes Inc.'s recommended pad layout.
SMAZ20-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 15.2 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
SMAZ20-13-F FAQ
1.How can I place an order for SMAZ20-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAZ20-13-F 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 SMAZ20-13-F reliable?
The price and inventory of SMAZ20-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAZ20-13-F is usually 5 days.
3.What payment methods are accepted for SMAZ20-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAZ20-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAZ20-13-F?
SMAZ20-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAZ20-13-F 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 SMAZ20-13-F?
For technical support, including SMAZ20-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAZ20-13-F requirements.
6.How does Aetrix verify that SMAZ20-13-F is sourced from the original manufacturer or authorized distributors?
All SMAZ20-13-F 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 SMAZ20-13-F meets industry standards.
7.What is the process for return or replacement of SMAZ20-13-F?
All SMAZ20-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAZ20-13-F, 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 SMAZ20-13-F part is unused and in its original packaging.
Return procedure for SMAZ20-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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