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Vishay BZD27B51P-HE3_A18
- Part No.:
- BZD27B51P-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
BZD27B51P-HE3_A18.pdf
- Description:
- ZENER DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BZD27B51P-HE3_A18 from Vishay Semiconductors is a surface-mount, AEC-Q101-qualified Zener diode with nominal breakdown voltage of 51 V, ±2 % tolerance, 10 mA test current, 43 μA reverse leakage at 43 V, and 68.2 V clamping voltage at 5 A surge current. It serves as a precision voltage reference and transient overvoltage protector in automotive power rail conditioning circuits.
For engineers reviewing the BZD27B51P-HE3_A18 datasheet, BZD27B51P-HE3_A18 pinout, BZD27B51P-HE3_A18 application, or BZD27B51P-HE3_A18 equivalent, key selection criteria include its 150 W peak surge power rating (10/1000 μs), -65 °C to +175 °C operating temperature range, DO-219AB (SMF) package, and AEC-Q101 qualification for automotive under-hood use.
Technical Context
This unidirectional Zener diode operates in reverse-bias breakdown mode to regulate or clamp voltage. Its 51 V nominal Zener voltage is specified at 10 mA (IZT1), with dynamic resistance of 25 Ω and temperature coefficient of +0.07 %/°C to +0.12 %/°C - indicating stable voltage regulation across temperature.
Designed for high-reliability transient suppression, it delivers 150 W non-repetitive peak surge power per IEC 60-1 (10/1000 μs waveform) and features low-profile DO-219AB packaging compatible with automated SMT assembly and reflow soldering up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 49.98 V min. / 51 V nom. / 52.02 V max. - tight ±2 % tolerance enables precise voltage reference in feedback loops. |
| Test Current (IZT) | 10 mA - standard bias point for specifying VZ; ensures stable regulation under typical sensing conditions. |
| Clamping Voltage (VC) | 68.2 V at IRSM = 5 A - defines maximum voltage seen during transient events, critical for downstream IC protection. |
| Peak Surge Power (PRSM) | 150 W (10/1000 μs) - supports robust ESD and load-dump immunity in 12 V/24 V automotive systems. |
| Operating Temperature | -65 °C to +175 °C - qualified for under-hood engine control units and transmission control modules. |
| Package | DO-219AB (SMF) - 2.7 × 3.5 mm footprint, MSL Level 1, compatible with high-volume SMT lines. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including powertrain, body electronics, and ADAS subsystems. |
Pinout & Package
DO-219AB (SMF) package: 2-terminal, surface-mount, cathode-marked device with 2.7 mm × 3.5 mm body, 0.85 mm height, and gull-wing lead geometry. Compliant with J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener operation | Provides path for forward conduction (<1.2 V @ 0.2 A); tied to ground or low-side reference in clamp configurations. |
| Cathode | Current exit terminal in forward bias; Zener breakdown occurs between cathode and anode | Connected to protected line (e.g., 12 V rail); absorbs surge energy by conducting to ground when voltage exceeds 51 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability, including temperature cycling, humidity, and mechanical shock tests. |
| ±2 % Zener voltage tolerance | Enables accurate voltage threshold setting without external trimming in safety-critical power monitoring circuits. |
| 150 W peak surge power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (load dump) transients in 24 V commercial vehicle systems. |
| Low dynamic impedance (25 Ω) | Maintains tight regulation under varying load currents, minimizing output voltage deviation during transient recovery. |
| MSL Level 1 & 260 °C reflow compatibility | Eliminates pre-baking requirements and supports standard lead-free PCB assembly processes. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting microcontroller ADC reference inputs and CAN transceiver power rails from load-dump spikes in 12 V/24 V battery systems. IC Role / Device Role / Timing Role: Unidirectional voltage clamp placed between supply rail and ground, activated only during overvoltage events. Use Value: Limits rail voltage to ≤68.2 V during 150 W surges, preventing latch-up or permanent damage to 5 V/3.3 V logic interfaces. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against field-wiring induced transients. IC Role / Device Role / Timing Role: Front-end transient voltage suppressor in optocoupler-isolated input stage. Use Value: Clamps fast-rising surges (≤100 ns rise time) before they reach isolation barrier, preserving signal integrity and long-term insulation life. |
| Automotive Body Control Module (BCM) | Telecom Power Supply Monitoring |
Use Scenario: Regulating auxiliary 5 V supply derived from buck converter in door module, subject to alternator ripple and jump-start surges. IC Role / Device Role / Timing Role: Precision Zener reference for feedback divider network in secondary DC-DC regulator. Use Value: Maintains ±2 % output accuracy over -40 °C to +125 °C ambient, ensuring reliable window comparator operation for fault detection. |
Use Scenario: Providing overvoltage lockout threshold for redundant 48 V telecom rectifier outputs feeding distributed power architecture. IC Role / Device Role / Timing Role: Standby-mode voltage supervisor that triggers shutdown if main rail exceeds safe limit. Use Value: Delivers stable 51 V reference with <0.12 %/°C drift, enabling accurate trip-point setting across full industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Higher clamping voltage (73.5 V), higher PPPM (600 W), but ±5 % VZ tolerance and no AEC-Q101 qualification | Used in general-purpose industrial surge suppression where automotive qualification is not required | Select SMBJ51A only for cost-sensitive non-automotive designs needing higher surge margin but tolerating looser voltage accuracy. |
| BZX84-C51 | SOT-23 package, 500 mW Ptot, ±5 % VZ, no surge rating or AEC-Q101 qualification | Limited to low-power signal-level voltage reference or biasing, not suitable for power rail clamping | Choose BZX84-C51 only for space-constrained board-level references where surge immunity is irrelevant and power dissipation remains below 300 mW. |
Compared with SMBJ51A and BZX84-C51, the BZD27B51P-HE3_A18 uniquely combines AEC-Q101 qualification, ±2 % precision, 150 W surge capability, and DO-219AB thermal performance - making it the sole option for automotive power rail protection requiring both accuracy and ruggedness.
Availability
BZD27B51P-HE3_A18 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input stages, and telecom power supervision requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for BZD27B51P-HE3_A18 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The BZD27B Series targets automotive-grade voltage regulation and transient protection, engineered specifically for under-hood environments demanding extended temperature operation and AEC-Q101 compliance.
FAQ
What is the Zener voltage tolerance of BZD27B51P-HE3_A18?
The BZD27B51P-HE3_A18 has a Zener voltage tolerance of ±2 %, with a nominal value of 51 V and a specified range of 49.98 V to 52.02 V at 10 mA test current. This tight tolerance is confirmed in the Vishay BZD27B Series datasheet (Rev. 2.1, Table on page 2) and enables precise voltage reference applications without external calibration. The BZD27B51P-HE3_A18 achieves this via process-controlled silicon planar junction fabrication.
Is BZD27B51P-HE3_A18 qualified for automotive use?
Yes, the BZD27B51P-HE3_A18 is AEC-Q101 qualified, as indicated by the "-HE3" suffix in its ordering code and explicitly stated in the Vishay datasheet's FEATURES section. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and ESD (HBM > 8 kV, MM > 800 V). This qualification makes the BZD27B51P-HE3_A18 suitable for engine control, body electronics, and ADAS applications where automotive-grade reliability is mandatory.
What is the maximum clamping voltage of BZD27B51P-HE3_A18 during surge events?
The BZD27B51P-HE3_A18 has a maximum clamping voltage (VC) of 68.2 V at a peak surge current (IRSM) of 5 A, measured using the 10/1000 μs waveform per IEC 60-1. This value is documented in the "ELECTRICAL CHARACTERISTICS" table on page 3 of the Vishay datasheet. The BZD27B51P-HE3_A18 maintains this clamping performance across its full operating temperature range (-65 °C to +175 °C), ensuring consistent protection in harsh environments.
Which package does BZD27B51P-HE3_A18 use, and what are its key mechanical properties?
The BZD27B51P-HE3_A18 uses the DO-219AB (SMF) package: a low-profile, surface-mount case with dimensions of 2.7 mm × 3.5 mm × 0.85 mm and gull-wing terminals. It complies with MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. The BZD27B51P-HE3_A18's package also meets JESD 201 Class 2 whisker testing and UL 94 V-0 flammability rating, as verified in the "PACKAGE" section of the Vishay datasheet (page 2).
How does the temperature coefficient affect BZD27B51P-HE3_A18's voltage stability?
The BZD27B51P-HE3_A18 exhibits a temperature coefficient (αVZ) ranging from +0.07 %/°C to +0.12 %/°C, meaning its Zener voltage increases slightly with rising junction temperature. This positive drift is typical for mid-voltage Zeners (~51 V) and ensures predictable, monotonic behavior across -65 °C to +175 °C. The BZD27B51P-HE3_A18's coefficient is specified at 10 mA test current and directly impacts long-term reference accuracy in thermally variable environments like automotive ECUs.
BZD27B51P-HE3_A18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay
- Package/Case:
- DO-219AB
- Series:
- BZD27B, eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V (Max)
- Voltage - Breakdown (Min):
- 49.98V
- Voltage - Clamping (Max) @ Ipp:
- 68.2V
- Current - Peak Pulse (10/1000µs):
- 2.1A
- Power - Peak Pulse:
- 150W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
BZD27B51P-HE3_A18 FAQ
1.How can I place an order for BZD27B51P-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZD27B51P-HE3_A18 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 BZD27B51P-HE3_A18 reliable?
The price and inventory of BZD27B51P-HE3_A18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZD27B51P-HE3_A18 is usually 5 days.
3.What payment methods are accepted for BZD27B51P-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZD27B51P-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZD27B51P-HE3_A18?
BZD27B51P-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZD27B51P-HE3_A18 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 BZD27B51P-HE3_A18?
For technical support, including BZD27B51P-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZD27B51P-HE3_A18 requirements.
6.How does Aetrix verify that BZD27B51P-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All BZD27B51P-HE3_A18 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 BZD27B51P-HE3_A18 meets industry standards.
7.What is the process for return or replacement of BZD27B51P-HE3_A18?
All BZD27B51P-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with BZD27B51P-HE3_A18, 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 BZD27B51P-HE3_A18 part is unused and in its original packaging.
Return procedure for BZD27B51P-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZD27B51P-HE3_A18 Tags
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