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Diodes Incorporated SMAZ36-13
- Part No.:
- SMAZ36-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAZ36-13.pdf
- Description:
- DIODE ZENER 36V 1W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,721
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Product details
Overview
SMAZ36-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with a nominal zener voltage of 36.0V (±5%), 27.4V minimum regulation voltage at IZM, 40Ω maximum zener impedance at 10mA, and 0.5µA maximum reverse leakage at 27.4V. It is used for precision voltage regulation and overvoltage protection in DC power rails and reference circuits.
For engineers reviewing the SMAZ36-13 datasheet, SMAZ36-13 pinout, SMAZ36-13 application, or SMAZ36-13 equivalent, key selection criteria include zener voltage tolerance, power derating above +50°C, thermal resistance (RθJA = 100°C/W), cathode polarity marking, and RoHS-compliant matte tin plating.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and line conditions. Its 1.0W power rating is specified at +25°C and linearly derates by 10mW/°C above +50°C when mounted on FR-4 PCB per Diodes Inc.'s recommended pad layout.
It features a standard SMA package with cathode band polarity identification, UL 94V-0 molded plastic case, and moisture sensitivity level 1. The device exhibits 350Ω maximum dynamic impedance at knee current (IZK = 1mA) and 40Ω typical zener impedance at test current (IZT = 10mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 36.0V nominal, 34.2–37.8V range at IZT = 10mA - defines regulation setpoint accuracy |
| Power Dissipation (PD) | 1.0W at TA = +25°C - sets maximum steady-state thermal load on PCB |
| Zener Impedance (ZZT) | 40Ω max at IZT = 10mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 0.5µA max at VR = 27.4V - ensures minimal quiescent current in standby regulation |
| Thermal Resistance (RθJA) | 100°C/W - quantifies junction-to-ambient temperature rise per watt dissipated |
| Forward Voltage (VF) | 1.2V at IF = 200mA - relevant for reverse-polarity protection use cases |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic case per JEDEC DO-214AC outline; dimensions: 4.60 × 2.92 × 1.63 mm (L × W × H); cathode identified by band or notch on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener operation | Required for correct orientation during PCB placement; reverse connection prevents regulation |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener operation | Marked by visible band; must be routed to regulated rail or voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| 1.0W Power Rating | Enables robust voltage clamping in 5–24V DC systems without external heatsinking |
| ±5% Zener Voltage Tolerance | Supports tight-tolerance reference design without post-calibration trimming |
| Lead-Free & Halogen-Free Construction | Meets IPC-J-STD-020 Level 1 moisture sensitivity and RoHS 2 (2011/65/EU) compliance |
| Cathode Band Polarity Marking | Ensures unambiguous orientation during automated pick-and-place assembly |
| UL 94V-0 Flame-Retardant Case | Reduces fire propagation risk in high-density power supply layouts |
Applications
| Industrial Power Supply Regulation | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Stabilizing +3.3V or +5V auxiliary rails in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Zener shunt regulator providing low-noise, low-drift reference for ADCs and comparators. Use Value: Maintains ±1% output stability over −40°C to +85°C ambient with no active feedback loop. | Use Scenario: Generating precise bias voltage for sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Voltage reference source for analog front-end amplifiers and temperature-compensated transducers. Use Value: Delivers <0.5µA leakage at 27.4V, minimizing current draw from battery-backed subsystems. |
| Overvoltage Protection Clamp | DC-DC Converter Feedback Divider |
Use Scenario: Protecting microcontroller I/O pins from transient surges on 24V CAN bus interfaces. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage to ≤37.8V during ESD or load-dump events. Use Value: Responds within nanoseconds due to low junction capacitance (<20pF at 0V), preserving signal integrity. | Use Scenario: Setting output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Precision voltage reference in secondary-side feedback path. Use Value: Enables ±2% output accuracy across line/load variations without trimming resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C36-7-F | 350mW rating, SOT-23 package, RθJA = 300°C/W, VZ = 36V ±5% | Limited to low-power signal-level regulation; unsuitable for >100mA load currents | Select when board space is constrained and power dissipation remains below 350mW |
| 1N4738A | 1.0W through-hole DO-41 package, VZ = 33V ±5%, no RoHS/Green compliance | Requires wave soldering; incompatible with automated SMT lines and lead-free reflow profiles | Select only for legacy through-hole designs where RoHS exemption applies |
Compared with BZX84-C36-7-F and 1N4738A, SMAZ36-13 uniquely combines 1.0W SMT capability, full RoHS/halogen-free compliance, and industry-standard SMA footprint-making it optimal for new industrial and automotive designs requiring high-reliability surface-mount regulation.
Availability
SMAZ36-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, overvoltage protection circuits, and DC-DC converter feedback networks requiring stable component supply and full RoHS compliance.
Supply support for SMAZ36-13 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 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 precision voltage regulation and transient suppression in space-constrained, high-volume SMT applications.
FAQ
What is the maximum continuous reverse current the SMAZ36-13 can handle before thermal runaway?
The SMAZ36-13 is rated for 1.0W at +25°C, with IZM = 28mA calculated as PD/VZ. At 28mA and 36V, junction temperature rise is limited by RθJA = 100°C/W. Exceeding this current without adequate PCB copper area or ambient cooling risks exceeding the +150°C maximum junction temperature.
Does the SMAZ36-13 require a series current-limiting resistor in all applications?
Yes - a series resistor is mandatory to limit IZ to ≤28mA and prevent thermal failure. For example, regulating a 48V rail to 36V requires ≥429Ω (12V/28mA) minimum resistance. Resistor power rating must also exceed (IZ)² × R to avoid drift or burnout.
How does the 34.2–37.8V zener voltage range affect circuit accuracy?
This ±5% tolerance directly impacts regulation accuracy: a 36V nominal device may regulate between 34.2V and 37.8V depending on unit variation and operating temperature. For applications needing tighter regulation, consider using an active shunt reference or trimming the feedback divider in switching regulators.
Can SMAZ36-13 be used in place of SMAZ33 or SMAZ39 in existing designs?
No - SMAZ33 (33V) and SMAZ39 (39V) have different zener voltages, test currents (15mA vs. 10mA), and impedance profiles. Substitution alters regulation point and dynamic response; redesign validation-including thermal and transient testing-is required before interchange.
SMAZ36-13 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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 27.4 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
SMAZ36-13 FAQ
1.How can I place an order for SMAZ36-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAZ36-13 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 SMAZ36-13 reliable?
The price and inventory of SMAZ36-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAZ36-13 is usually 5 days.
3.What payment methods are accepted for SMAZ36-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAZ36-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAZ36-13?
SMAZ36-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAZ36-13 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 SMAZ36-13?
For technical support, including SMAZ36-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAZ36-13 requirements.
6.How does Aetrix verify that SMAZ36-13 is sourced from the original manufacturer or authorized distributors?
All SMAZ36-13 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 SMAZ36-13 meets industry standards.
7.What is the process for return or replacement of SMAZ36-13?
All SMAZ36-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAZ36-13, 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 SMAZ36-13 part is unused and in its original packaging.
Return procedure for SMAZ36-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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