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Nexperia USA Inc. BZT52H-A27X
- Part No.:
- BZT52H-A27X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A27X.pdf
- Description:
- DIODE ZENER 27V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:9,076
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Product details
Overview
BZT52H-A27X from Nexperia is a precision Zener voltage regulator diode in SOD123F package, designed for stable voltage reference and overvoltage protection in low-power circuits. It delivers 27 V nominal Zener voltage at 2 mA test current, ±1 % tolerance, 250 Ω maximum differential resistance, and supports up to 830 mW total power dissipation at Tamb ≤ 25 °C - used in power supply feedback loops and analog sensor biasing.
For engineers reviewing the BZT52H-A27X datasheet, BZT52H-A27X pinout, BZT52H-A27X application, or BZT52H-A27X equivalent, this page provides verified Zener parameters, thermal behavior under PCB-mount conditions, SOD123F footprint compliance, and direct alternatives with documented voltage/tolerance/thermal differences.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining a stable reverse-biased breakdown voltage across its cathode-anode terminals when reverse current exceeds knee threshold. Its ±1 % tolerance and low temperature coefficient (±0.05 mV/K) enable high-accuracy references in temperature-stable designs.
Thermal performance is defined by Rth(j-a) = 330 K/W (free air) and Rth(j-sp) = 70 K/W (solder point), with junction temperature limited to 150 °C. Non-repetitive peak reverse current is rated at 1.0 A for 100 μs pulses at Tamb = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal at IZ = 2 mA; tight ±1 % tolerance ensures minimal calibration drift in reference circuits. |
| Differential Resistance (rdif) | ≤250 Ω max at IZ = 2 mA; low impedance maintains regulation stability under load transients. |
| Reverse Current (IR) | ≤40 μA max at VR = 22.5 V; low leakage preserves battery life in always-on monitoring nodes. |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad; defines safe continuous DC operating envelope. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; enables predictable forward conduction for polarity-sensitive protection schemes. |
| Temperature Coefficient (SZ) | ±0.05 mV/K at IZ = 2 mA; near-zero TC minimizes drift over -65 °C to +150 °C ambient range. |
| Package | SOD123F: 3.6 mm × 1.7 mm × 1.0 mm surface-mount plastic case with flat leads; IPC-compliant for reflow soldering. |
Pinout & Package
SOD123F is a 2-lead surface-mount plastic package with cathode marked by a bar on the body. Mounting requires standard reflow profile per Figure 12; thermal pad area for cathode is 1 cm² for full 830 mW rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse breakdown current during regulation. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path; must be routed with low-inductance trace in high-speed protection. |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables single-point calibration in 27 V reference designs without trimming resistors. |
| 830 mW power rating on standard FR4 | Supports higher-current regulation than legacy 500 mW Zeners without heatsinking. |
| Low 250 Ω dynamic impedance | Reduces output voltage variation under ±1 mA load shifts in feedback networks. |
| SOD123F footprint compatibility | Matches industry-standard 0805-sized land pattern; simplifies PCB layout and assembly. |
| 150 °C maximum junction temperature | Permits operation in sealed industrial enclosures with limited airflow. |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Stabilizing output voltage of isolated DC-DC converter via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise 27 V threshold to TL431-like control IC. Use Value: ±1 % VZ eliminates need for external resistor adjustment; 250 Ω rdif ensures <10 mV error under 1 mA feedback current variation. |
Use Scenario: Protecting 3.3 V GPIO pins against accidental 24 V field wiring faults. IC Role / Device Role / Timing Role: Fast-acting clamp diverting surge current away from MCU input ESD structure. Use Value: 1.0 A non-repetitive IZSM handles 100 μs transients; 0.9 V VF prevents forward conduction during normal operation. |
| Temperature-Stable Sensor Biasing | Low-Power Analog Front-End Reference |
Use Scenario: Providing excitation voltage to RTD or bridge sensor in industrial temperature transmitter. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric measurement circuitry. Use Value: ±0.05 mV/K temperature coefficient limits drift to <0.3 mV over 0–70 °C ambient range. |
Use Scenario: Setting reference level for 12-bit ADC in battery-powered data logger. IC Role / Device Role / Timing Role: Low-leakage voltage node stabilizing ADC internal reference divider. Use Value: ≤40 μA reverse current at 22.5 V preserves >10-year battery life in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B27 | ±2 % tolerance; identical VZ, rdif, and Ptot; same SOD123F package. | Acceptable where system-level calibration compensates for initial tolerance; lower cost. | Select when absolute accuracy is secondary to cost and footprint compatibility. |
| MMSZ5256ET1G | 27 V ±5 %; 200 mW Ptot; SOD-123 package (not SOD123F); 500 Ω rdif. | Lower power handling and looser tolerance limit use to non-critical biasing only. | Choose only if legacy design reuse mandates ON Semiconductor footprint; verify thermal derating. |
Compared with BZT52H-A27X, the BZT52H-B27 trades ±1 % accuracy for cost savings without sacrificing thermal or electrical robustness, while MMSZ5256ET1G requires significant PCB redesign and accepts higher regulation error and lower surge capability.
Availability
BZT52H-A27X is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, and microcontroller I/O protection requiring stable component supply, consistent Zener voltage binning, and SOD123F assembly compatibility.
Supply support for BZT52H-A27X 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 global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZT52H series belongs to Nexperia's precision Zener diode product line, engineered for high-accuracy voltage regulation in space-constrained, thermally demanding applications where ±1 % tolerance and low thermal drift are critical.
FAQ
What is the maximum continuous reverse current for BZT52H-A27X at 25 °C ambient?
The device supports up to 250 mA forward current, but for Zener operation, maximum continuous reverse current is derived from Ptot: at 27 V, IZ ≤ 830 mW / 27 V ≈ 30.7 mA. This assumes no additional thermal derating beyond the 25 °C ambient condition specified for full 830 mW rating.
Can BZT52H-A27X replace older BZX584B27 in existing SOD123 designs?
Yes - both use SOD123/SOD123F footprints and share 27 V nominal Zener voltage, but BZT52H-A27X offers ±1 % tolerance versus ±2 % for BZX584B27 and improved thermal resistance (Rth(j-sp) = 70 K/W vs. ~90 K/W). No layout change is needed, though calibration may improve.
How does the SOD123F package differ from standard SOD-123 in thermal performance?
SOD123F features flattened leads that improve solder joint reliability and thermal transfer to the PCB. Its Rth(j-sp) is 70 K/W (cathode solder point) versus ~85–95 K/W for standard SOD-123, enabling 15–20 % higher power handling under identical board conditions.
Is BZT52H-A27X qualified for automotive applications?
No - per Revision 7 (January 2023), this part is explicitly designated non-automotive qualified. Nexperia offers separate -Q qualified variants (e.g., BZT52H-Q series) with AEC-Q101 testing; BZT52H-A27X is intended for industrial, consumer, and computing applications only.
BZT52H-A27X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-A27X FAQ
1.How can I place an order for BZT52H-A27X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A27X 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 BZT52H-A27X reliable?
The price and inventory of BZT52H-A27X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-A27X is usually 5 days.
3.What payment methods are accepted for BZT52H-A27X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A27X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A27X?
BZT52H-A27X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A27X 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 BZT52H-A27X?
For technical support, including BZT52H-A27X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A27X requirements.
6.How does Aetrix verify that BZT52H-A27X is sourced from the original manufacturer or authorized distributors?
All BZT52H-A27X 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 BZT52H-A27X meets industry standards.
7.What is the process for return or replacement of BZT52H-A27X?
All BZT52H-A27X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A27X, 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 BZT52H-A27X part is unused and in its original packaging.
Return procedure for BZT52H-A27X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-A27X Tags
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