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Diodes Incorporated BZT52C18T-7
- Part No.:
- BZT52C18T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZT52C18T-7.pdf
- Description:
- DIODE ZENER 18V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:20,426
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Product details
Overview
BZT52C18T-7 from Diodes Incorporated is a surface-mount Zener diode with a nominal zener voltage of 18 V, ±5.6% tolerance (16.8–19.1 V), 300 mW power dissipation, 45 Ω dynamic impedance at 5 mA test current, and SOD523 package. It provides precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the BZT52C18T-7 datasheet, BZT52C18T-7 pinout, BZT52C18T-7 application, or BZT52C18T-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (417 °C/W), reverse leakage (<0.1 µA at 12.4 V), temperature coefficient (+12.6 mV/°C), and JEDEC-qualified reliability for industrial and automotive-adjacent designs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 5 mA zener test current and 45 Ω impedance at 1 kHz ensure predictable regulation across ambient temperatures from –55 °C to +150 °C.
The SOD523 package enables high-power-density mounting on compact PCBs, with flat-lead construction optimizing thermal conduction and solderability. The cathode band marking and matte tin–annealed terminals comply with MIL-STD-202 and RoHS 3 (2015/863/EU) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 16.8–19.1 V range at 5 mA - defines regulated output voltage under typical bias |
| Power Dissipation (PD) | 300 mW - maximum continuous power at 25 °C ambient; derates linearly above 25 °C per Fig. 1 |
| Zener Impedance (ZZT) | 45 Ω at 1 kHz - determines AC regulation stability and ripple rejection capability |
| Reverse Leakage (IR) | <0.1 µA at 12.4 V - ensures minimal quiescent current in standby or sensing circuits |
| Temperature Coefficient | +12.6 mV/°C - quantifies voltage drift with junction temperature change |
| Thermal Resistance (RθJA) | 417 °C/W - indicates junction-to-ambient heat transfer efficiency on standard FR-4 board |
Pinout & Package
Package: SOD523 - ultra-compact, low-profile surface-mount package (0.55–0.65 mm height, 1.15–1.25 mm length), molded green plastic, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in regulation circuit; forms reference ground for shunt configuration |
| Cathode | Reverse-bias terminal / Zener breakdown node | Marked by cathode band; connected to higher-potential rail to enable controlled breakdown and voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-qualified reliability | Qualified to AEC-Q standards for high-reliability applications including automotive-adjacent systems |
| Green compound packaging | Halogen- and antimony-free molding compound (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb) |
| Low-profile SOD523 footprint | Enables placement in space-constrained layouts without sacrificing thermal performance |
| Matte tin–annealed terminals | Ensures robust solder wetting and long-term intermetallic stability per MIL-STD-202 |
Applications
| Power Supply Regulation | Sensor Reference Voltage |
|---|---|
Use Scenario: Stabilizing 18 V bias rail for op-amp comparators and analog front-ends in industrial controllers. IC Role / Device Role / Timing Role: Shunt voltage regulator providing precise, low-drift reference for signal conditioning stages. Use Value: Maintains ±5.6% output tolerance across –40 °C to +85 °C, minimizing calibration drift in measurement systems. | Use Scenario: Generating stable 18 V reference for bridge sensor excitation in pressure transducers. IC Role / Device Role / Timing Role: Precision voltage source enabling ratiometric ADC conversion independent of supply variation. Use Value: Low 0.1 µA leakage at 12.4 V prevents loading error in high-impedance sensor bridges. |
| Overvoltage Protection | Signal Line Clamping |
Use Scenario: Protecting microcontroller I/O pins from transient surges on 15 V logic interfaces. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage to 19.1 V peak during ESD or inductive kick events. Use Value: 300 mW rating sustains 100 ms surge pulses without degradation; 417 °C/W RθJA supports thermal recovery. | Use Scenario: Limiting RS-485 bus voltage swing to prevent receiver saturation in noisy factory environments. IC Role / Device Role / Timing Role: Bidirectional clamp (with series diode) restricting differential voltage to safe levels. Use Value: 45 Ω ZZT ensures minimal distortion of 250 kbps data signals while clamping transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245B-7-F | Zener voltage 18 V, but ±5% tolerance (17.1–18.9 V); 350 mW PD; SOT-23 package | Larger footprint and higher thermal resistance (500 °C/W) than SOD523 | Select when higher power margin is needed and board area permits SOT-23 |
| BZX84-C18 | Zener voltage 18 V, ±5% tolerance; 300 mW PD; SOT-23 package; different marking and thermal specs | Not qualified to AEC-Q; lacks green compound compliance per Diodes' specification | Choose only for non-automotive, cost-sensitive consumer designs where RoHS 3 and halogen-free status are not required |
Compared with MMBZ5245B-7-F and BZX84-C18, BZT52C18T-7 offers tighter process control for voltage tolerance, superior thermal performance in ultra-compact layout, and full halogen/antimony-free compliance-making it preferred for space-constrained, high-reliability industrial modules.
Availability
BZT52C18T-7 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, and portable medical devices requiring stable component supply, JEDEC-qualified reliability, and green material compliance.
Supply support for BZT52C18T-7 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 the Americas.
The BZT52CxxT series belongs to Diodes' precision Zener diode product line, engineered for voltage reference, regulation, and protection in space-constrained, thermally demanding applications across industrial, computing, and automotive-adjacent markets.
FAQ
What is the maximum reverse voltage before breakdown for BZT52C18T-7?
The nominal zener voltage is 18 V, with a guaranteed range of 16.8 V to 19.1 V at 5 mA test current. Breakdown begins within this range; operation below 16.8 V results in negligible reverse current (<0.1 µA at 12.4 V), confirming sharp knee characteristics per Figure 2 and 3 in DS30502 Rev. 18-2.
Can BZT52C18T-7 be used in automotive applications?
BZT52C18T-7 is JEDEC-qualified for high reliability and manufactured in IATF 16949-certified facilities, but it is not AEC-Q200 qualified. For automotive-grade use, Diodes recommends the Q-suffix variant (e.g., BZT52C18TQ-7-F), which undergoes additional stress testing and PPAP documentation per AEC-Q200 requirements.
How does the SOD523 package affect thermal performance?
Mounted on FR-4 with 2 oz copper and 1.92 mm² pad area, the SOD523 delivers RθJA = 417 °C/W and RθJC = 160 °C/W. This enables full 300 mW dissipation at 25 °C ambient, with linear derating to zero at 150 °C - verified in Figure 1 of the datasheet and validated per JESD51-2 thermal test standards.
Is there a recommended PCB pad layout for BZT52C18T-7?
Yes - Diodes specifies a recommended SOD523 pad layout: G = 0.80 mm, X = 0.60 mm, X1 = 2.00 mm, Y = 0.70 mm, with 0.1 mm radius fillets. This layout optimizes solder joint strength and thermal transfer; full dimensions and land pattern guidelines are published at diodes.com/package-outlines.html under SOD523.
BZT52C18T-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±6%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZT52C18T-7 FAQ
1.How can I place an order for BZT52C18T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C18T-7 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 BZT52C18T-7 reliable?
The price and inventory of BZT52C18T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C18T-7 is usually 5 days.
3.What payment methods are accepted for BZT52C18T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C18T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C18T-7?
BZT52C18T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C18T-7 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 BZT52C18T-7?
For technical support, including BZT52C18T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C18T-7 requirements.
6.How does Aetrix verify that BZT52C18T-7 is sourced from the original manufacturer or authorized distributors?
All BZT52C18T-7 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 BZT52C18T-7 meets industry standards.
7.What is the process for return or replacement of BZT52C18T-7?
All BZT52C18T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C18T-7, 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 BZT52C18T-7 part is unused and in its original packaging.
Return procedure for BZT52C18T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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