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Diodes Incorporated BZT52C51Q-7-F
- Part No.:
- BZT52C51Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C51Q-7-F.pdf
- Description:
- DIODE ZENER 51V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,668
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Product details
Overview
BZT52C51Q-7-F from Diodes Incorporated is an automotive-grade surface-mount Zener diode with a nominal zener voltage of 51 V, ±5.9% tolerance (48.0–54.0 V), 500 mW power dissipation at TL = +75°C, and 370 mW at TA = +25°C. It features SOD123 package, AEC-Q101 qualification, and is used for precision voltage regulation and overvoltage protection in automotive power supply rails.
For engineers reviewing the BZT52C51Q-7-F datasheet, BZT52C51Q-7-F pinout, BZT52C51Q-7-F application, or BZT52C51Q-7-F equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, low temperature coefficient (+38 mV/°C), maximum reverse current (0.1 µA @ 38.0 V), and automotive reliability validation per AEC-Q101.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low leakage, with thermal resistance junction-to-lead of 150 °C/W enabling reliable operation in compact automotive PCB layouts.
The device exhibits a typical zener impedance of 100 Ω at 1 kHz and 5 mA test current, and 750 Ω at knee current (IZK = 0.5 mA), supporting both regulation and clamping functions. Its cathode band polarity and matte tin-plated terminals ensure compatibility with automated reflow assembly and lead-free soldering processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, 48.0–54.0 V range at IZT = 5 mA - defines precise clamping threshold for 48 V system protection |
| Power Dissipation (PD) | 370 mW at TA = +25°C - limits continuous power handling on standard FR-4 PCB without heatsinking |
| Zener Impedance (ZZT) | 100 Ω at f = 1 kHz, IZT = 5 mA - indicates voltage stability under dynamic load transients |
| Reverse Current (IR) | 0.1 µA max at VR = 38.0 V - ensures minimal standby leakage in battery-sensitive applications |
| Temperature Coefficient | +38 mV/°C - quantifies positive drift rate, critical for high-temperature automotive environments |
| Package | SOD123 - 2.65 mm × 1.55 mm footprint with 0.57 mm lead pitch, optimized for space-constrained modules |
Pinout & Package
Two-terminal device in SOD123 plastic package with cathode band marking. Terminals are matte tin-finished alloy 42 leads; polarity is unidirectional with cathode as marked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential rail; forms reference ground for regulation loop |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Marked with band; supplies regulated 51 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use up to +150°C junction temperature and 1000-hour HTOL stress |
| Green, halogen-free construction | Meets <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies Tier 1 automotive environmental compliance |
| Low moisture sensitivity | MSL Level 1 per J-STD-020 - enables unlimited floor life and eliminates bake requirements pre-reflow |
| Planar die technology | Ensures tight VZ distribution (±5.9%) and repeatable ZZT across production lots |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protects microcontroller GPIO inputs from load-dump transients in 12 V/48 V dual-voltage BCMs. IC Role / Device Role / Timing Role: Zener clamp limiting input voltage to 51 V during ISO 7637-2 Pulse 5a events. Use Value: Prevents latch-up or ESD damage to 5 V logic interfaces while maintaining MSL-1 handling integrity. |
Use Scenario: Shields analog input channels of 24 V DC-powered programmable logic controllers from field-wiring surges. IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable 51 V reference for overvoltage detection circuitry. Use Value: Enables accurate trip-point setting within ±0.5 V across -40°C to +125°C ambient range. |
| Automotive Infotainment Power Rail | Medical Diagnostic Equipment Bias Supply |
Use Scenario: Stabilizes auxiliary 51 V bias rail feeding RF front-end amplifiers in vehicle telematics units. IC Role / Device Role / Timing Role: Voltage reference element in discrete feedback network for DC-DC converter output regulation. Use Value: Delivers <1 % output variation over 100–500 mA load steps due to low ZZT and tight VZ tolerance. |
Use Scenario: Provides isolated 51 V reference for photomultiplier tube (PMT) high-voltage bias generation. IC Role / Device Role / Timing Role: Low-leakage (<0.1 µA) voltage clamp ensuring signal integrity in ultra-low-current measurement paths. Use Value: Eliminates baseline drift caused by parasitic current injection into sensitive analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ51QT1G | Zener voltage 51 V (48.5–53.5 V), 500 mW PD, SOD123, AEC-Q101 qualified | Narrower VZ tolerance but higher ZZT (150 Ω vs. 100 Ω); same thermal performance | Select for tighter initial calibration where dynamic impedance is secondary |
| BZX84-C51-7-F | Zener voltage 51 V (48.0–54.0 V), 350 mW PD, SOT23, commercial grade only | Lower power rating and no AEC-Q101; smaller footprint but higher RθJA (450 °C/W) | Acceptable for non-automotive, space-constrained prototypes with derated power |
Compared with MMSZ51QT1G and BZX84-C51-7-F, BZT52C51Q-7-F offers superior thermal robustness (RθJL = 150 °C/W), tighter production VZ consistency, and full automotive qualification-making it the preferred choice for production-grade 48 V system protection where reliability and long-term stability are mandatory.
Availability
BZT52C51Q-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection circuits, and medical diagnostic equipment bias supplies requiring stable component supply with full AEC-Q101 traceability.
Supply support for BZT52C51Q-7-F 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, specializing in high-reliability components for automotive, industrial, and computing markets.
The BZT52C series belongs to Diodes' automotive-qualified Zener diode product line, designed specifically for voltage regulation and transient suppression in harsh-environment 12 V/48 V vehicle electrical systems.
FAQ
What is the maximum reverse voltage (VR) at which IR is specified for BZT52C51Q-7-F?
The maximum reverse current (IR) of 0.1 µA is specified at VR = 38.0 V, not at the nominal zener voltage. This reflects the device's leakage behavior well below breakdown, critical for low-power monitoring circuits where standby current must remain sub-nanoampere.
Does BZT52C51Q-7-F support reflow soldering per JEDEC J-STD-020?
Yes - BZT52C51Q-7-F is rated for MSL Level 1 and supports standard lead-free reflow profiles (peak 260°C, 10-second dwell). Its matte tin finish and alloy 42 leadframe ensure wetting reliability and intermetallic formation control without voiding or dewetting.
How does the +38 mV/°C temperature coefficient affect regulation accuracy over temperature?
At +38 mV/°C, the zener voltage increases by ~1.9 V over a 50°C rise (e.g., from 25°C to 75°C). This drift is linear and predictable, allowing compensation in closed-loop designs; it also confirms the device uses a mixed-mode (avalanche + Zener) structure optimized for >5.6 V operation.
Is the SOD123 package of BZT52C51Q-7-F compatible with IPC-7351B standard footprints?
Yes - the SOD123 outline (D = 1.55 mm, E = 2.65 mm, b = 0.57 mm) matches IPC-7351B "SOD123" land pattern recommendations. Diodes' suggested pad layout (X = 0.90 mm, X1 = 4.05 mm, Y = 0.95 mm) aligns with Class L density and supports automated optical inspection.
BZT52C51Q-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5.88%
- Power - Max:
- 370 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 38 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52C51Q-7-F FAQ
1.How can I place an order for BZT52C51Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C51Q-7-F 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 BZT52C51Q-7-F reliable?
The price and inventory of BZT52C51Q-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C51Q-7-F is usually 5 days.
3.What payment methods are accepted for BZT52C51Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C51Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C51Q-7-F?
BZT52C51Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C51Q-7-F 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 BZT52C51Q-7-F?
For technical support, including BZT52C51Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C51Q-7-F requirements.
6.How does Aetrix verify that BZT52C51Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZT52C51Q-7-F 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 BZT52C51Q-7-F meets industry standards.
7.What is the process for return or replacement of BZT52C51Q-7-F?
All BZT52C51Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C51Q-7-F, 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 BZT52C51Q-7-F part is unused and in its original packaging.
Return procedure for BZT52C51Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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