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Vishay BZD27B18P-HE3_A18
- Part No.:
- BZD27B18P-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
BZD27B18P-HE3_A18.pdf
- Description:
- ZENER DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,460
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Product details
Overview
BZD27B18P-HE3_A18 from Vishay Semiconductors is a surface-mount, AEC-Q101 qualified Zener diode with nominal breakdown voltage of 18 V (±2 %), 25 mA test current, and 150 W peak surge power rating (10/1000 μs). It operates across -65 °C to +175 °C and delivers stable voltage regulation in automotive power rail protection circuits.
For engineers reviewing the BZD27B18P-HE3_A18 datasheet, BZD27B18P-HE3_A18 pinout, BZD27B18P-HE3_A18 application, or BZD27B18P-HE3_A18 equivalent, key selection criteria include its ±2 % VZ tolerance, 5.9 V clamping voltage at 24.6 A, low dynamic resistance (13 Ω), and MSL level 1 reflow compatibility up to 260 °C.
Technical Context
This unidirectional Zener diode functions as a precision voltage reference and transient voltage suppressor in DC power rails. Its silicon planar construction ensures low leakage (<5 μA at VR = 15 V) and excellent long-term stability under thermal cycling.
The device features a DO-219AB (SMF) package with 1.9 mm × 1.7 mm footprint and 0.85 mm height, optimized for high-power density PCB layouts. Its junction-to-lead thermal resistance is 30 K/W, enabling reliable operation at TJ up to 175 °C without derating on standard 3 mm × 3 mm Cu pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ Nominal | 18 V ±2 % - tight tolerance enables accurate voltage clamping in safety-critical automotive systems |
| IZT | 25 mA - standardized test current for repeatable VZ measurement and comparator reference design |
| VC @ IRSM | 24.6 V at 5.9 A - clamping voltage during 10/1000 μs surge defines overvoltage protection threshold |
| PRSM | 150 W - peak non-repetitive surge power handling capability per IEC 60-1, section 8 |
| RthJL | 30 K/W - low junction-to-lead thermal resistance supports high pulse power dissipation without heatsink |
| TJ max | 175 °C - extended junction temperature rating allows use in under-hood automotive environments |
| ESD HBM | >8 kV - robust electrostatic discharge immunity meets AEC-Q101 requirements for vehicle assembly |
Pinout & Package
Package: DO-219AB (SMF), low-profile surface-mount case with cathode marking on top surface; dimensions 2.9 mm × 1.7 mm × 0.85 mm; compatible with 8 mm tape and reflow soldering (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to lower-potential node in reverse-biased protection configuration; handles 0.2 A forward current (VF ≤ 1.2 V) |
| Cathode | Zener breakdown terminal | Marked side; connects to higher-potential rail; carries surge current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS power supplies |
| MSL Level 1 rating | Zero floor life limitation; supports unlimited exposure to ambient before reflow soldering |
| JESD 201 Class 2 whisker resistance | Ensures mechanical reliability in high-vibration environments without tin whisker growth risk |
| UL 94 V-0 molding compound | Flame-retardant encapsulation required for automotive cabin and battery management systems |
| Low dynamic impedance | 13 Ω at 25 mA enables sharp knee characteristic for precise voltage regulation |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Input Stage |
|---|---|
Use Scenario: Protects 12 V supply rail against load dump transients up to 120 V during alternator disconnection. IC Role / Device Role / Timing Role: Unidirectional Zener clamp placed between VIN and GND to limit voltage excursion below 25 V. Use Value: Clamps at 24.6 V with 5.9 A surge current, preventing damage to downstream MCU and CAN transceivers. | Use Scenario: Stabilizes 24 V DC input in programmable logic controller backplane during brownout and surge events. IC Role / Device Role / Timing Role: Voltage reference and overvoltage protector in primary DC-DC converter feedback path. Use Value: ±2 % VZ tolerance ensures consistent regulation across temperature, supporting ±0.5 % output accuracy. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Power Supply |
Use Scenario: Shields LIN bus interface ICs from ESD and inductive switching spikes on 12 V lighting circuits. IC Role / Device Role / Timing Role: Transient voltage suppressor connected across LIN transceiver VCC and GND pins. Use Value: >8 kV HBM ESD rating and 150 W surge capacity prevent latch-up and permanent failure during field service. | Use Scenario: Guards isolated 5 V auxiliary supply against coupling noise from motor drivers and solenoid actuation. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable bias for analog sensor signal conditioning circuitry. Use Value: Low 5 μA reverse leakage at 15 V minimizes quiescent current draw in battery-powered standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | TVS diode with 18 V standoff, 28.2 V clamping, 600 W peak power; bidirectional variant available | Designed for fast transient suppression (tR < 1 ns); less precise regulation than Zener | Select when surge energy exceeds 150 W or sub-nanosecond response is required |
| BZX84-C18LT1G | SOT-23 package; ±5 % VZ tolerance; 300 mW PD; no AEC-Q101 qualification | Lower power rating and wider tolerance limit use to non-automotive consumer electronics | Select only for cost-sensitive, non-automotive applications with relaxed accuracy and reliability requirements |
Compared with BZD27B18P-HE3_A18, SMBJ18A-E3/52 offers higher surge power but looser voltage control, while BZX84-C18LT1G provides SOT-23 convenience at the expense of AEC-Q101 compliance and thermal performance.
Availability
BZD27B18P-HE3_A18 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input conditioning, and medical infusion pump power stabilization requiring stable component supply and full traceability.
Supply support for BZD27B18P-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 AEC-Q101-compliant Zener regulation and surge protection in harsh-environment power systems where precision, longevity, and thermal resilience are critical.
FAQ
What is the Zener voltage tolerance for BZD27B18P-HE3_A18?
The BZD27B18P-HE3_A18 has a nominal Zener voltage of 18 V with a guaranteed tolerance of ±2 %, measured at 25 mA test current and 25 °C ambient. This tight tolerance is confirmed in the Vishay datasheet revision 2.1 and supports high-accuracy voltage reference designs in automotive and industrial applications where regulation stability is essential. The BZD27B18P-HE3_A18 maintains this specification across its full operating temperature range.
Does BZD27B18P-HE3_A18 meet automotive qualification standards?
Yes, BZD27B18P-HE3_A18 is explicitly AEC-Q101 qualified, as indicated by the "-HE3" suffix in its ordering code and verified in Vishay's official documentation. It also passes JESD 201 Class 2 whisker testing and supports wave and reflow soldering up to 260 °C. These qualifications make the BZD27B18P-HE3_A18 suitable for deployment in engine control units, body control modules, and other automotive subsystems requiring certified reliability.
What is the maximum clamping voltage of BZD27B18P-HE3_A18 during surge events?
The BZD27B18P-HE3_A18 clamps at 24.6 V when subjected to a 10/1000 μs surge waveform with peak current of 5.9 A, as specified in the Vishay datasheet electrical characteristics table. This clamping voltage defines the upper voltage limit seen by protected circuitry during transient overvoltage events. The BZD27B18P-HE3_A18 achieves this performance while maintaining low dynamic impedance (13 Ω) and stable thermal behavior up to 175 °C junction temperature.
Can BZD27B18P-HE3_A18 be used in place of a standard 1N4744A?
No, BZD27B18P-HE3_A18 is not a direct replacement for the through-hole 1N4744A due to fundamental differences in package (DO-219AB vs. DO-41), surge rating (150 W vs. ~4 W), and qualification (AEC-Q101 vs. commercial grade). While both regulate near 18 V, the BZD27B18P-HE3_A18 is optimized for high-energy transient suppression in automotive SMT assemblies, whereas the 1N4744A serves general-purpose through-hole voltage reference roles. Substitution requires PCB redesign and validation of thermal and surge performance.
What is the moisture sensitivity level (MSL) rating for BZD27B18P-HE3_A18?
The BZD27B18P-HE3_A18 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be stored indefinitely at ambient conditions without baking prior to reflow soldering. This rating is enabled by its DO-219AB package construction and UL 94 V-0 molding compound. The MSL Level 1 classification simplifies manufacturing logistics and eliminates moisture-related defects such as popcorning during reflow, making the BZD27B18P-HE3_A18 ideal for high-volume automotive electronics production.
BZD27B18P-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):
- 15V (Max)
- Voltage - Breakdown (Min):
- 17.64V
- Voltage - Clamping (Max) @ Ipp:
- 24.6V
- Current - Peak Pulse (10/1000µs):
- 5.9A
- 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)
BZD27B18P-HE3_A18 FAQ
1.How can I place an order for BZD27B18P-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZD27B18P-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 BZD27B18P-HE3_A18 reliable?
The price and inventory of BZD27B18P-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 BZD27B18P-HE3_A18 is usually 5 days.
3.What payment methods are accepted for BZD27B18P-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZD27B18P-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZD27B18P-HE3_A18?
BZD27B18P-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZD27B18P-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 BZD27B18P-HE3_A18?
For technical support, including BZD27B18P-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZD27B18P-HE3_A18 requirements.
6.How does Aetrix verify that BZD27B18P-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All BZD27B18P-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 BZD27B18P-HE3_A18 meets industry standards.
7.What is the process for return or replacement of BZD27B18P-HE3_A18?
All BZD27B18P-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with BZD27B18P-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 BZD27B18P-HE3_A18 part is unused and in its original packaging.
Return procedure for BZD27B18P-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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