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Nexperia USA Inc. BZT52H-B39-QX
- Part No.:
- BZT52H-B39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B39-QX.pdf
- Description:
- DIODE ZENER 39V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:4,612
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Product details
Overview
BZT52H-B39-QX from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 39 V nominal breakdown voltage at 2 mA, 300 Ω maximum differential resistance, and 75 μA reverse current at 31.2 V, qualified to AEC-Q101 for automotive voltage regulation.
For engineers reviewing the BZT52H-B39-QX datasheet, BZT52H-B39-QX pinout, BZT52H-B39-QX application, or BZT52H-B39-QX equivalent, this device supports precision biasing, overvoltage clamping, and reference voltage generation in space-constrained automotive ECUs and industrial power supplies where stable 39 V regulation under 2 mA test current is required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified 39 V nominal Zener voltage (VZ) at IZ = 2 mA, exhibiting a temperature coefficient of +0.05 mV/K and 300 Ω typical dynamic impedance (rdif). Its thermal resistance from junction to solder point is 70 K/W, enabling reliable operation up to 150 °C junction temperature.
Designed for surface-mount applications, it delivers 830 mW total power dissipation on a 1 cm² cathode pad and maintains ≤75 μA reverse leakage at VR = 31.2 V (0.8 × VZ), meeting AEC-Q101 stress-test requirements for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal at IZ = 2 mA; defines precise clamping threshold for protection circuits |
| Tolerance | ±2 %; ensures tight voltage control across production batches for reference stability |
| Differential Resistance (rdif) | 300 Ω max at IZ = 2 mA; limits output voltage variation under load changes |
| Reverse Current (IR) | 75 μA max at VR = 31.2 V; guarantees low standby leakage in always-on systems |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C with 1 cm² cathode pad; sets thermal derating baseline for PCB layout |
| Junction Temperature (Tj) | 150 °C max; enables operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes; validated for automotive discrete semiconductor stress testing including HTRB, HTSL, and TC |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, 3.4–3.6 mm length × 2.5–2.7 mm width × 0.7–1.0 mm height; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias polarity must be maintained for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use per stress-test standard, supporting ECU and ADAS module deployment |
| ±2 % voltage tolerance | Enables tighter system-level voltage margining than ±5 % variants, reducing need for post-regulation trimming |
| 830 mW power rating | Supports higher-energy transient suppression without external series resistor in 12 V/24 V battery clamp designs |
| SOD123F footprint | 0.55 mm lead pitch and 2.5 mm width enable high-density routing on compact PCBs used in body control modules |
| 150 °C junction rating | Permits operation adjacent to power MOSFETs or DC-DC converters in engine bay electronics without thermal derating penalties |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamping 39 V supply rail against load-dump transients in door module microcontroller power domain. IC Role / Device Role / Timing Role: Zener shunt regulator providing overvoltage protection and stable reference for LDO feedback divider. Use Value: Limits peak voltage to ≤42 V during ISO 7637-2 Pulse 5a events, preventing MCU brownout or latch-up. |
Use Scenario: Protecting 4–20 mA current loop receiver inputs from field-wiring surge coupling. IC Role / Device Role / Timing Role: Reverse-biased voltage clamp absorbing induced spikes before they reach precision op-amp input stage. Use Value: Withstands 40 W non-repetitive surges (100 μs) while maintaining <75 μA leakage at 31.2 V, preserving signal integrity. |
| Automotive Infotainment Power Sequencing | Medical Sensor Bias Supply |
Use Scenario: Generating stable 39 V bias for LCD backlight LED string driver in head unit display subsystem. IC Role / Device Role / Timing Role: Precision voltage reference setting current-sense threshold for constant-current regulation. Use Value: ±2 % tolerance ensures consistent LED brightness across temperature (-40 °C to +125 °C ambient). |
Use Scenario: Providing calibrated excitation voltage for bridge-based pressure transducers in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise Zener reference establishing fixed VREF for 24-bit delta-sigma ADC front-end. Use Value: 300 Ω rdif minimizes output impedance-induced gain error in ratiometric measurement configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C39-Q | ±5 % tolerance, 41.2 V max VZ, 45 μA IR at 31.2 V | Lower cost; acceptable where system voltage margin allows wider regulation band | Select when cost sensitivity outweighs need for tight 39 V accuracy in non-critical biasing |
| MMSZ5242B-TP | ±5 % tolerance, 38 V nominal, SOD-123 package, 500 mW Ptot | Higher power derating above 70 °C; lacks AEC-Q101 qualification | Use only in commercial-grade equipment with ambient <85 °C and no automotive compliance requirement |
Compared with BZT52H-B39-QX, the C39 variant trades voltage precision for cost and lower leakage, while MMSZ5242B-TP offers similar form factor but reduced thermal capability and no automotive qualification-making BZT52H-B39-QX optimal for safety-critical 39 V reference needs.
Availability
BZT52H-B39-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input protection, infotainment power sequencing, and medical sensor bias supply requiring stable component supply with AEC-Q101 assurance.
Supply support for BZT52H-B39-QX 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-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient protection in harsh automotive environments.
FAQ
What is the maximum reverse voltage (VR) at which BZT52H-B39-QX guarantees ≤75 μA leakage?
The datasheet specifies 75 μA maximum reverse current at VR = 31.2 V, which equals 0.8 × VZ (0.8 × 39 V). This value is measured at Tj = 25 °C and defines the upper limit of usable reverse bias before significant leakage compromises regulation accuracy.
Can BZT52H-B39-QX be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For >830 mW dissipation, use a single higher-rated device or add external current-sharing resistors with careful thermal design.
How does the SOD123F package affect thermal performance compared to SOD-123?
SOD123F features flattened leads and optimized copper pad layout, achieving 70 K/W Rth(j-sp) versus ~90 K/W for standard SOD-123. This 22 % lower thermal resistance improves power handling in thermally constrained layouts like multi-layer automotive PCBs.
Is the 39 V Zener voltage specified at DC or pulsed conditions?
VZ = 39 V is specified at DC test condition IZ = 2 mA per Table 9. Pulse testing (tp ≤ 300 μs) applies only to forward voltage (VF) characterization; Zener parameters are DC-steady-state values relevant to continuous regulation applications.
BZT52H-B39-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H-Q
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±2.05%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-B39-QX FAQ
1.How can I place an order for BZT52H-B39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B39-QX 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-B39-QX reliable?
The price and inventory of BZT52H-B39-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-B39-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B39-QX?
BZT52H-B39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B39-QX 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-B39-QX?
For technical support, including BZT52H-B39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B39-QX requirements.
6.How does Aetrix verify that BZT52H-B39-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B39-QX 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-B39-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B39-QX?
All BZT52H-B39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B39-QX, 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-B39-QX part is unused and in its original packaging.
Return procedure for BZT52H-B39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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