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Nexperia USA Inc. BZT52-C12X
- Part No.:
- BZT52-C12X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C12X.pdf
- Description:
- DIODE ZENER 12.05V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,422
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Product details
Overview
BZT52-C12X from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 12 V nominal Zener voltage at 5 mA, 90 Ω maximum differential resistance, and 590 mW total power dissipation at Tamb ≤ 25 °C; used for precision voltage reference and low-power regulation in sensor biasing, power supply feedback, and analog signal conditioning circuits.
For engineers reviewing the BZT52-C12X datasheet, BZT52-C12X pinout, BZT52-C12X application, or BZT52-C12X equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (210 K/W junction-to-solder-point), reverse current limit (0.1 μA at VR = 9.4 V), and SOD123 footprint compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its 12 V nominal Zener voltage is specified at IZ = 5 mA with ±5 % tolerance (11.4–12.7 V range) and exhibits a positive temperature coefficient of +6.0 mV/K at IZ = 5 mA.
The device features low differential resistance (≤90 Ω), enabling tight regulation under small current variations, and supports non-repetitive peak reverse power dissipation up to 40 W for tp = 100 μs pulses - critical for transient suppression in low-energy clamping applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 12 V nominal at IZ = 5 mA; actual range 11.4–12.7 V defines regulation window for feedback loop stability |
| Tolerance | ±5 %; determines worst-case output voltage deviation in precision reference designs |
| Differential Resistance rdif | ≤90 Ω; limits output voltage shift under ±1 mA load current change (ΔVZ ≈ ±90 mV) |
| Reverse Current IR | ≤0.1 μA at VR = 9.4 V; ensures minimal leakage in high-impedance bias networks |
| Total Power Dissipation Ptot | 590 mW at Tamb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad; sets max continuous DC power handling |
| Thermal Resistance Rth(j-sp) | 210 K/W junction-to-solder-point; enables thermal modeling for board-level reliability under sustained load |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA; defines conduction loss when used in forward-biased protection paths |
Pinout & Package
SOD123 surface-mount plastic package: 2.80 mm × 1.70 mm body, 0.70 mm lead pitch, cathode marked by band on end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking band identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Stable 12 V reference | Guaranteed 11.4–12.7 V range at 5 mA enables accurate feedback in 12 V SMPS controllers |
| Low differential resistance | ≤90 Ω minimizes output voltage drift under dynamic load steps in analog sensor interfaces |
| SOD123 footprint | Standardized 2.8 × 1.7 mm outline supports high-density layout and reflow-compatible assembly |
| High surge capability | 40 W non-repetitive peak power (tp = 100 μs) provides robustness against ESD and line transients |
| Low leakage current | ≤0.1 μA at 9.4 V prevents loading of high-impedance voltage dividers in precision measurement circuits |
Applications
| Power Supply Feedback | Sensor Biasing |
|---|---|
Use Scenario: Providing reference voltage to optocoupler input in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Zener diode establishes stable 12 V threshold for TL431 or transistor-based error amplifier triggering. Use Value: ±5 % tolerance and 90 Ω rdif ensure <±1.5 % output voltage regulation over line/load/temperature variation. |
Use Scenario: Biasing bridge-based pressure sensor requiring precise excitation voltage. IC Role / Device Role / Timing Role: Acts as shunt reference to generate clean 12 V rail from unregulated 15 V supply. Use Value: 0.1 μA IR avoids loading 10 MΩ sensor bridge arms, preserving measurement accuracy. |
| Analog Signal Clamping | Microcontroller I/O Protection |
Use Scenario: Limiting op-amp output swing to prevent saturation in active filter stages. IC Role / Device Role / Timing Role: Reverse-connected Zener clamps signal between −0.9 V (VF) and +12.7 V (VZmax). Use Value: 40 W pulse rating absorbs short-duration overvoltage transients without degradation. |
Use Scenario: Protecting 3.3 V MCU GPIO pins from 12 V accidental contact during field servicing. IC Role / Device Role / Timing Role: Placed anode-to-GPIO, cathode-to-12 V rail to clamp negative excursions. Use Value: 0.9 V forward drop ensures fast turn-on below logic low threshold, limiting pin voltage to −0.9 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B (ON Semiconductor) | Same 12 V nominal, ±5 %, but SOT-23 package; higher rdif (100 Ω max) and lower Ptot (350 mW) | Less thermal margin in high-ambient environments; requires larger copper pour for equivalent power handling | Select when SOT-23 footprint is standardized across design and 350 mW suffices |
| BZX384-C12 (Nexperia) | Same 12 V/±5 % spec, but SOD-323 package; lower Ptot (300 mW) and higher rdif (120 Ω) | Reduced surge capability (25 W vs. 40 W); unsuitable for transient-heavy industrial I/O protection | Choose only for space-constrained layouts where 300 mW derating is acceptable |
Compared with BZT52-C12X, MMBZ5242B trades thermal performance for smaller footprint, while BZX384-C12 sacrifices both power handling and regulation tightness for ultra-compact size - making BZT52-C12X optimal for cost-sensitive, thermally demanding 12 V reference applications.
Availability
BZT52-C12X is available at Aetrix Electronics and suitable for power supply feedback, sensor biasing, analog signal clamping, and microcontroller I/O protection requiring stable component supply and consistent parametric performance across production batches.
Supply support for BZT52-C12X 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
Nexperia is a leading semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, with global manufacturing and logistics infrastructure.
The BZT52 series targets general-purpose voltage regulation in consumer, industrial, and computing applications, emphasizing SMD compatibility, parametric consistency, and cost-effective performance across 2.4–75 V Zener voltages.
FAQ
What is the maximum continuous reverse current the BZT52-C12X can sustain?
The BZT52-C12X is not rated for continuous reverse current; it operates in Zener breakdown mode with specified test current IZ = 5 mA. Sustained reverse current must remain within power limits: at Tamb = 25 °C, max IZ = Ptot / VZ ≈ 49 mA (590 mW / 12 V), derated linearly above 25 °C using Rth(j-a) = 350 K/W.
Can BZT52-C12X replace BZT52-B12 in existing designs?
No - BZT52-C12X has ±5 % tolerance (11.4–12.7 V), while BZT52-B12 has ±2 % (11.8–12.2 V). Substituting introduces up to ±3 % additional voltage uncertainty, potentially violating regulation specs in precision feedback loops or reference circuits.
How does the 210 K/W junction-to-solder-point thermal resistance impact PCB layout?
Rth(j-sp) = 210 K/W means each 100 mW of dissipated power raises junction temperature by 21 K above solder point temperature. To hold Tj ≤ 125 °C at Tamb = 85 °C, the cathode pad must be ≥1 cm² copper area with tin plating - per Nexperia's test condition - to limit solder point rise to ≤40 K.
Is BZT52-C12X qualified for automotive applications?
No - per Nexperia's revision history (Rev. 2, October 2025), C-series BZT52 devices are non-automotive qualified. Automotive use requires the -Q qualified variants (e.g., BZT52-C12-Q), which undergo AEC-Q101 stress testing and have different qualification documentation.
BZT52-C12X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12.05 V
- Tolerance:
- ±5.4%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52-C12X FAQ
1.How can I place an order for BZT52-C12X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C12X 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 BZT52-C12X reliable?
The price and inventory of BZT52-C12X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C12X is usually 5 days.
3.What payment methods are accepted for BZT52-C12X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C12X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C12X?
BZT52-C12X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C12X 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 BZT52-C12X?
For technical support, including BZT52-C12X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C12X requirements.
6.How does Aetrix verify that BZT52-C12X is sourced from the original manufacturer or authorized distributors?
All BZT52-C12X 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 BZT52-C12X meets industry standards.
7.What is the process for return or replacement of BZT52-C12X?
All BZT52-C12X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C12X, 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 BZT52-C12X part is unused and in its original packaging.
Return procedure for BZT52-C12X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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