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Diodes Incorporated SMAZ39-13-F
- Part No.:
- SMAZ39-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAZ39-13-F.pdf
- Description:
- DIODE ZENER 39V 1W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:36,524
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Product details
Overview
SMAZ39-13-F from Diodes Incorporated is a 1.0W surface-mount Zener diode with a nominal zener voltage of 39.0V (±5% tolerance), 10mA test current, 40Ω maximum zener impedance at 10mA, and 0.5µA maximum reverse leakage at 29.6V. It features SMA package, lead-free RoHS-compliant plating, and is used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the SMAZ39-13-F datasheet, SMAZ39-13-F pinout, SMAZ39-13-F application, or SMAZ39-13-F equivalent, key selection criteria include zener voltage accuracy, thermal resistance (RθJA = 100°C/W), power derating above +50°C, and cathode-band polarity marking for automated placement verification.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 39.0V nominal regulation voltage is specified at IZT = 10mA, with differential impedance of ≤40Ω ensuring low output variation across current changes.
Designed for surface-mount assembly on FR-4 PCBs, it delivers 1.0W power dissipation at +25°C, derating linearly at 10mW/°C above +50°C. Thermal resistance from junction-to-ambient is 100°C/W, requiring appropriate copper area for thermal management in high-reliability applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39.0V nominal, 37.05–40.95V range at 10mA - defines regulated output voltage window for feedback sensing |
| Power Dissipation (PD) | 1.0W at TA = +25°C - sets maximum continuous power handling before thermal shutdown risk |
| Zener Impedance (ZZT) | ≤40Ω at IZT = 10mA - determines output voltage stability under dynamic load transients |
| Reverse Leakage (IR) | ≤0.5µA at VR = 29.6V - ensures minimal quiescent current in standby regulation paths |
| Thermal Resistance (RθJA) | 100°C/W - requires ≥1.0 inch² copper pour for safe operation at full power in ambient >+50°C |
| Package | SMA (DO-214AC) - industry-standard SMD outline with cathode band polarity marking |
| 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 / Zener cathode reference | Connected to lower-potential node in regulation circuit; reverse-biased during normal operation |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated rail; provides stable 39V reference when reverse-biased above VZ threshold |
Key Features
| Feature | Design Value |
|---|---|
| 1.0W Power Rating | Enables use in medium-power shunt regulators without external heat sinking on standard PCB layouts |
| ±5% Zener Voltage Tolerance | Supports tight regulation in feedback networks for AC/DC adapters and DC-DC converters |
| Cathode Band Polarity Marking | Ensures reliable automated optical inspection (AOI) and pick-and-place alignment in high-volume SMT lines |
| Moisture Sensitivity Level 1 | Eliminates baking requirement prior to reflow, reducing manufacturing overhead and moisture-related defects |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in TL431-based secondary-side feedback loop of 24V-output AC/DC adapter to regulate output within ±1%. IC Role / Device Role / Timing Role: Zener reference providing precise 39V threshold for optocoupler biasing and error amplifier input scaling. Use Value: Maintains regulation accuracy despite line/load transients due to low ZZT (≤40Ω) and stable VZ over temperature. | Use Scenario: Placed across 36V DC bus in industrial PLC I/O module to suppress ESD-induced surges. IC Role / Device Role / Timing Role: Shunt clamping element that conducts above 39V to divert transient energy to ground. Use Value: Limits peak voltage to <41V with <0.5µA leakage at operating voltage, minimizing standby power loss. |
| Programmable Voltage Reference | Microcontroller Reset Circuit |
Use Scenario: Paired with resistor divider to generate 3.3V reference for ADC calibration in battery-powered sensor node. IC Role / Device Role / Timing Role: Stable voltage source enabling ratiometric measurement against internal VREF. Use Value: Delivers <0.1% long-term drift over 1000 hours due to low thermal coefficient and robust packaging. | Use Scenario: Configured as supervisor threshold in automotive body control module to assert reset below 37V. IC Role / Device Role / Timing Role: Precision undervoltage detection element triggering MCU reset via open-drain signal path. Use Value: Guarantees clean reset assertion with 2.0V hysteresis margin between trip and release points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39LT1G | 0.3W rating, SOT-23 package, 39V ±5%, RθJA = 300°C/W | Lower power handling limits use to low-current references (<5mA); unsuitable for shunt regulation above 150mW | Select when board space is constrained and thermal budget allows higher junction temperature rise |
| 1N4739A | 1.0W DO-41 through-hole package, 39V ±5%, no RoHS/Green compliance | Requires wave soldering or hand-soldering; incompatible with fully automated SMT lines | Select only for legacy repair or prototyping where through-hole mounting is mandated |
Compared with BZX84-C39LT1G and 1N4739A, SMAZ39-13-F uniquely balances 1.0W SMT power capability, RoHS/Green compliance, and industry-standard SMA footprint-making it optimal for volume-manufactured power supplies requiring regulatory and thermal reliability.
Availability
SMAZ39-13-F is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply and full RoHS compliance.
Supply support for SMAZ39-13-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, specializing in high-reliability components for power management, signal integrity, and protection applications.
SMAZ series Zener diodes belong to Diodes Inc.'s precision voltage regulation product line, engineered for stable reference performance in commercial and industrial power conversion systems.
FAQ
What is the maximum reverse voltage (VR) at which IR ≤ 0.5µA is guaranteed?
The datasheet specifies IR ≤ 0.5µA at VR = 29.6V - this is the maximum reverse voltage below the zener knee where leakage remains within specification. Operation above this voltage enters the breakdown region, where controlled conduction begins at VZ = 39.0V.
Can SMAZ39-13-F be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For higher power, use a single higher-rated device or active regulation with a pass transistor.
Is the SMAZ39-13-F suitable for automotive applications per AEC-Q200?
No - SMAZ39-13-F is rated for commercial temperature range (–65°C to +150°C) but is not AEC-Q200 qualified. Diodes Incorporated offers AEC-Q200-qualified Zeners (e.g., MMBZ52xx series) for automotive use.
How does the 100°C/W RθJA value translate to practical PCB layout?
A RθJA of 100°C/W means a 1.0W dissipation causes ~100°C junction-to-ambient rise. To keep TJ <125°C at TA = 50°C, limit power to ≤0.75W or add ≥1.5 inch² of 2-oz copper connected to both terminals using thermal vias.
SMAZ39-13-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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 29.6 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
SMAZ39-13-F FAQ
1.How can I place an order for SMAZ39-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAZ39-13-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 SMAZ39-13-F reliable?
The price and inventory of SMAZ39-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAZ39-13-F is usually 5 days.
3.What payment methods are accepted for SMAZ39-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAZ39-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAZ39-13-F?
SMAZ39-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAZ39-13-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 SMAZ39-13-F?
For technical support, including SMAZ39-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAZ39-13-F requirements.
6.How does Aetrix verify that SMAZ39-13-F is sourced from the original manufacturer or authorized distributors?
All SMAZ39-13-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 SMAZ39-13-F meets industry standards.
7.What is the process for return or replacement of SMAZ39-13-F?
All SMAZ39-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAZ39-13-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 SMAZ39-13-F part is unused and in its original packaging.
Return procedure for SMAZ39-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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