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Diodes Incorporated DDZX27D-7
- Part No.:
- DDZX27D-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDZX27D-7.pdf
- Description:
- DIODE ZENER 27V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,876
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Product details
Overview
DDZX27D-7 from Diodes Incorporated is a surface-mount precision Zener diode in SOT23 package, rated for 27.0 V nominal zener voltage (26.29–27.64 V range at 5 mA), 300 mW power dissipation on FR-4 PCB, and 45 Ω maximum zener impedance at test current. It delivers tight voltage tolerance, low leakage (<0.05 µA at 21.0 V), and AEC-Q101 qualification for automotive-grade reliability in voltage reference and regulation circuits.
For engineers reviewing the DDZX27D-7 datasheet, DDZX27D-7 pinout, DDZX27D-7 application, or DDZX27D-7 equivalent, this page provides verified electrical parameters, thermal derating behavior, SOT23 terminal mapping, and direct alternatives with documented voltage/impedance/leakage differences - all critical for stable reference design in automotive power management and industrial sensing.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain precise DC voltage under varying load and temperature conditions. Its sharp knee characteristic and low dynamic impedance (45 Ω at 5 mA) enable high stability in feedback networks of switching regulators and analog sensor signal conditioning.
Designed for operation at 5 mA test current, it exhibits a temperature coefficient of approximately +0.08 %/°C (inferred from Fig. 18 for 27 V class), and supports ambient temperatures from –65 °C to +150 °C with full AEC-Q101 stress qualification including HTRB, HTSL, and TCT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.29–27.64 V at IZT = 5 mA - defines stable regulation window for 27 V reference designs |
| Power Dissipation (PD) | 300 mW on FR-4 PCB - sets max continuous power handling without heatsink |
| Zener Impedance (ZZT) | 45 Ω max at 5 mA - ensures minimal output voltage shift under load transients |
| Reverse Leakage (IR) | <0.05 µA at VR = 21.0 V - guarantees negligible error current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 417 °C/W - determines junction-to-ambient temperature rise per mW dissipated |
| Operating Temp Range | –65 °C to +150 °C - validated for under-hood automotive and industrial environments |
Pinout & Package
Package: SOT23 - surface-mount plastic case with matte tin annealed terminals, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground in standard shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 27 V reference when biased through series resistor |
| No-Connect (Pin 3) | Internal die attach flag / mechanical support | Not electrically connected; must remain unconnected in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp breakdown knee | Enables clean transition into regulation with <100 mV deviation across 1–10 mA current range |
| AEC-Q101 qualified | Validated for automotive applications including HTRB (1000 hrs @ 150 °C) and temperature cycling |
| Tight VZ tolerance | ±2.5% total spread (26.29–27.64 V) reduces need for post-assembly trimming |
| Low leakage current | <0.05 µA at 21 V enables use in battery-powered sensor references with >10-year shelf life |
| Lead-free & halogen-free | Complies with RoHS 2 and JEDEC J-STD-020 Level 1 - suitable for green manufacturing |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Current-Sense Amplifier Bias |
|---|---|
Use Scenario: Stable 27 V reference for ADC voltage scaling and microcontroller reset threshold in engine control modules. IC Role / Device Role / Timing Role: Shunt Zener providing precision voltage clamp and regulation for analog front-end circuitry. Use Value: Maintains ±0.3% reference accuracy over –40 °C to +125 °C, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Biasing high-side current-sense amplifier input in 24 V industrial motor drives. IC Role / Device Role / Timing Role: Precision voltage reference for offset calibration and gain stabilization. Use Value: 45 Ω dynamic impedance minimizes gain drift during current step changes up to 10 A. |
| Medical Infusion Pump Power Monitor | Telecom Base Station LDO Feedback Network |
Use Scenario: Voltage reference for isolated DC-DC converter feedback in Class II medical devices. IC Role / Device Role / Timing Role: Primary regulation element in secondary-side error amplifier loop. Use Value: Sub-0.1 µA leakage prevents false fault detection during standby mode (10 µA sleep current). |
Use Scenario: Setpoint reference for adjustable LDOs powering FPGA I/O banks in 48 V telecom systems. IC Role / Device Role / Timing Role: Zener-based feedback divider component ensuring output voltage stability. Use Value: Tight 2.5% VZ tolerance eliminates need for external trimming resistors, reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | VZ = 25.7–28.3 V (±5%), ZZT = 80 Ω max at 5 mA, PD = 350 mW | Higher impedance and wider tolerance reduce regulation accuracy in precision feedback loops | Acceptable for non-critical biasing where cost is prioritized over stability |
| MMSZ5256ET1G | VZ = 25.1–26.9 V (±5%), ZZT = 50 Ω max at 20 mA, not AEC-Q101 qualified | Lacks automotive qualification and has lower nominal voltage - unsuitable for 27 V target regulation | Only viable for commercial-grade 24 V systems with relaxed temp range (–65 °C to +150 °C not guaranteed) |
Compared with BZX84-C27LT1G and MMSZ5256ET1G, DDZX27D-7 offers tighter voltage tolerance (±2.5% vs. ±5%), lower dynamic impedance (45 Ω vs. ≥50 Ω), and full AEC-Q101 validation - making it the only choice for automotive and high-reliability industrial reference designs requiring long-term stability.
Availability
DDZX27D-7 is available at Aetrix Electronics and suitable for automotive ECU reference design, industrial current-sense amplifier biasing, and medical infusion pump power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DDZX27D-7 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The DDZX series targets high-precision, high-reliability Zener reference applications in automotive, industrial, and medical systems - emphasizing tight voltage tolerance, low leakage, and AEC-Q101 qualification.
FAQ
What is the maximum continuous power dissipation for DDZX27D-7 on standard FR-4 PCB?
The DDZX27D-7 is rated for 300 mW power dissipation when mounted on FR-4 PCB using Diodes Incorporated's recommended pad layout (documented in DS30408). Derating begins above +25 °C ambient, reaching zero power at +150 °C per the Fig. 1 derating curve.
Is DDZX27D-7 suitable for automotive applications?
Yes - DDZX27D-7 is fully qualified to AEC-Q101 standards, including high-temperature reverse bias (HTRB), temperature cycling, and highly accelerated stress testing. It is explicitly designated for automotive use in the datasheet and carries the "Q" suffix variant (DDZX27DQ) for automotive-specific traceability.
What is the polarity marking and pin 1 location for SOT23 package?
On the DDZX27D-7 SOT23 package, Pin 1 (Anode) is identified by a beveled edge or dot marking adjacent to the lead. The top-view schematic shows Anode at Pin 1, Cathode at Pin 2, and Pin 3 as internal flag (no connection). Polarity is confirmed in the "Top View Device Schematic" on page 2 of DS30408.
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
Per Fig. 18, DDZX27D-7 exhibits a positive temperature coefficient of ~+0.08 %/°C near 27 V. Over a 165 °C range, this contributes ≤±0.13% VZ drift - well within its ±2.5% initial tolerance, enabling stable performance without active compensation in most applications.
DDZX27D-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2.5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DDZX27D-7 FAQ
1.How can I place an order for DDZX27D-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDZX27D-7 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 DDZX27D-7 reliable?
The price and inventory of DDZX27D-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDZX27D-7 is usually 5 days.
3.What payment methods are accepted for DDZX27D-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDZX27D-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDZX27D-7?
DDZX27D-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDZX27D-7 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 DDZX27D-7?
For technical support, including DDZX27D-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDZX27D-7 requirements.
6.How does Aetrix verify that DDZX27D-7 is sourced from the original manufacturer or authorized distributors?
All DDZX27D-7 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 DDZX27D-7 meets industry standards.
7.What is the process for return or replacement of DDZX27D-7?
All DDZX27D-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDZX27D-7, 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 DDZX27D-7 part is unused and in its original packaging.
Return procedure for DDZX27D-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DDZX27D-7 Tags
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