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STMicroelectronics LDP01-30AY
- Part No.:
- LDP01-30AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LDP01-30AY.pdf
- Description:
- TVS DIODE 27VWM 40VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,734
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Product details
Overview
LDP01-30AY from STMicroelectronics is an AEC-Q101-qualified automotive Transil™ TVS diode designed for load-dump protection in 12 V and 24 V vehicle electrical systems. It features a 30 V nominal breakdown voltage (28.9–31.9 V), 125 A peak pulse current (8/20 µs), 49 V clamping voltage at 125 A, 1 µA leakage at 27 V, and operates up to 175 °C junction temperature. It is used in alternator output line protection for engine control units and body control modules.
For engineers reviewing the LDP01-30AY datasheet, LDP01-30AY pinout, LDP01-30AY application, or LDP01-30AY equivalent, key selection criteria include ISO 7637-2 Pulse 5a/5b and ISO 16750-2 Test A/B compliance, D²PAK thermal performance (Rth(j-c) = 0.24 °C/W), and low-temperature coefficient (αT = 9.7 × 10−4/°C) for stable clamping across automotive temperature ranges.
Technical Context
The LDP01-30AY employs planar silicon avalanche technology optimized for high-energy transient suppression in automotive power rails. Its bidirectional configuration enables symmetrical clamping during both positive and negative load-dump events, with dynamic impedance of 65 mΩ (10/1000 µs) and 1400 mΩ (8/20 µs).
It meets stringent automotive surge standards including ISO 7637-2 Pulse 5a (±150 V), Pulse 5b (±87 V), and ISO 16750-2 Tests A (up to +75 V) and B (up to +80 V), while maintaining <1 µA leakage at 27 V and full functionality up to Tj = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 28.9–31.9 V at 1 mA - defines minimum trigger threshold for load-dump clamping |
| Clamping Voltage (VCL) | 49 V at 125 A (8/20 µs) - maximum voltage seen by protected IC during worst-case surge |
| Peak Pulse Current | 125 A (8/20 µs) - supports robust protection against ISO 16750-2 Test A 75 V surges with 0.5 Ω source impedance |
| Leakage Current | 1 µA at 27 V, 25 °C - ensures minimal standby power loss in always-on vehicle modules |
| Junction Temperature Range | −55 to +175 °C - enables under-hood deployment without derating in modern powertrain ECUs |
| Thermal Resistance (Rth(j-c)) | 0.24 °C/W - allows >5 kW peak power dissipation at Tj = 175 °C with proper heatsinking |
Pinout & Package
Package: D²PAK (TO-263AB), surface-mount, single-row 3-lead outline with exposed cathode tab for thermal and electrical connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Transient current input (load-dump path) | Connected to battery rail upstream of protected circuit; carries full surge current |
| Anode 2 | Transient current input (load-dump path) | Electrically tied to Anode 1 internally; dual-anode structure improves current sharing and thermal distribution |
| Cathode | Clamped output / ground reference | Connected to system ground or low-impedance return path; serves as heat-sink interface via exposed metal tab |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock per JESD47 |
| ISO 7637-2 Pulse 5a/5b compliance | Clamps ±150 V (P5a) and ±87 V (P5b) transients with <49 V clamping at 125 A, enabling direct alternator line placement |
| Low αT temperature coefficient | 9.7 × 10−4/°C - limits VBR drift to <±1.5 V over −40 to +150 °C operating range |
| D²PAK thermal performance | Rth(j-c) = 0.24 °C/W - delivers 5.4 kW peak power handling at Tj = 175 °C with PCB copper area ≥ 10 cm² |
| UL 94 V0 resin & halogen-free | Meets automotive flammability and RoHS/ELV requirements for cabin- and engine-bay-mounted electronics |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Interface |
|---|---|
|
Use Scenario: Protects microcontroller power supply and CAN transceivers from alternator load-dump spikes during battery disconnect events. IC Role / Device Role: Primary bidirectional TVS clamp on 12 V main rail, placed between fuse and DC-DC converter input. Use Value: Limits voltage to ≤49 V during 150 V/125 A ISO 7637-2 Pulse 5a, preventing latch-up or oxide breakdown in downstream 3.3 V/5 V regulators. |
Use Scenario: Shields LIN bus transceivers and door-lock drivers from battery-line transients during ignition cycling and accessory load switching. IC Role / Device Role: High-power TVS on BCM main 12 V input, mounted directly to thermal pad on 2 oz copper layer. Use Value: Maintains <1 µA leakage at 27 V to avoid parasitic drain in sleep mode while surviving 87 V/110 A ISO 7637-2 Pulse 5b surges. |
| Advanced Driver Assistance System (ADAS) Camera ECU | Electric Power Steering (EPS) Motor Controller |
|
Use Scenario: Safeguards image sensor power and serializer ICs in rear-view cameras exposed to under-hood temperature extremes. IC Role / Device Role: Load-dump protector on 12 V input before buck converter, rated for continuous 175 °C junction operation. Use Value: Enables reliable operation at Tj = 175 °C with no derating, critical for sealed camera housings near exhaust manifolds. |
Use Scenario: Suppresses inductive kickback and alternator surges in EPS motor driver power stage during rapid torque transitions. IC Role / Device Role: Secondary TVS on high-side gate driver supply rail, complementing primary D²PAK on main battery input. Use Value: Delivers 1400 mΩ dynamic impedance at 8/20 µs to limit voltage overshoot to <55 V during 100 A motor phase-switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive load-dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | Unidirectional, SMA package, Rth(j-c) ≈ 50 °C/W, VCL = 48.4 V @ 100 A (8/20 µs) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a without parallel staging | Select when space-constrained and surge energy <100 mJ; requires external thermal management |
| SMCJ33A | Unidirectional, SMC package, VBR = 33–36.7 V, VCL = 53.3 V @ 113 A (8/20 µs), Tj max = 150 °C | Higher clamping voltage and lower temperature rating reduce margin in high-ambient under-hood use | Choose for cost-sensitive non-critical modules where 175 °C operation is not required |
Compared with SMAJ30A and SMCJ33A, the LDP01-30AY provides superior thermal capability (0.24 °C/W vs. >40 °C/W), full bidirectional clamping, and guaranteed 175 °C operation-making it the only option qualified for direct alternator-line placement in modern ASIL-B power domains.
Availability
LDP01-30AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera ECUs requiring stable component supply across extended automotive product lifecycles.
Supply support for LDP01-30AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete technologies with over 40 years of automotive qualification expertise.
The LDP01-xxAY series belongs to ST's Transil™ automotive TVS portfolio, engineered specifically for high-energy load-dump suppression in 12 V/24 V vehicle architectures compliant with ISO 7637-2 and ISO 16750-2.
FAQ
Is LDP01-30AY unidirectional or bidirectional?
LDP01-30AY is a bidirectional TVS diode, with both anodes electrically connected internally and cathode serving as the common reference. This configuration enables symmetrical clamping of both positive and negative transients-essential for meeting ISO 7637-2 Pulse 5a (+150 V) and Pulse 5b (−87 V) requirements without polarity-sensitive placement.
What is the recommended PCB layout for thermal performance?
For optimal thermal performance, the cathode tab must be soldered to a ≥10 cm² copper pour on the top layer, thermally connected via ≥6 thermal vias (0.3 mm diameter, 0.6 mm pitch) to an internal ground plane. ST recommends using 2 oz copper and minimizing solder mask coverage over the tab to achieve Rth(j-a) < 25 °C/W in standard 4-layer boards.
Does LDP01-30AY meet ISO 16750-2 Test B requirements?
Yes-LDP01-30AY is validated for ISO 16750-2 Test B (UA + Us* = 13.5 + 30 V, Us = 87 V, td = 400 ms, Ri = 0.5 Ω), clamping to ≤49 V at 125 A. Figure 12 in the datasheet shows Us* vs. Ri curves confirming compliance up to 80 V with Ri ≥ 0.5 Ω, making it suitable for EPS and transmission control unit power inputs.
Can LDP01-30AY replace LDP01-28AY or LDP01-33AY in existing designs?
LDP01-30AY is not a drop-in replacement due to its specific 30 V nominal breakdown (28.9–31.9 V). Substituting it for LDP01-28AY (26.7–29.5 V) risks premature triggering; replacing LDP01-33AY (31.1–34.3 V) may allow excessive voltage stress during surges. Design validation per ISO 7637-2 Pulse 5a/5b is required for any cross-part change.
LDP01-30AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- LDP01Y, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 27V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 125A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
LDP01-30AY FAQ
1.How can I place an order for LDP01-30AY through Aetrix?
Please submit a Request for Quotation (RFQ) for LDP01-30AY 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 LDP01-30AY reliable?
The price and inventory of LDP01-30AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP01-30AY is usually 5 days.
3.What payment methods are accepted for LDP01-30AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP01-30AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDP01-30AY?
LDP01-30AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDP01-30AY 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 LDP01-30AY?
For technical support, including LDP01-30AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP01-30AY requirements.
6.How does Aetrix verify that LDP01-30AY is sourced from the original manufacturer or authorized distributors?
All LDP01-30AY 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 LDP01-30AY meets industry standards.
7.What is the process for return or replacement of LDP01-30AY?
All LDP01-30AY units undergo pre-shipment inspection (PSI). If there is an issue with LDP01-30AY, 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 LDP01-30AY part is unused and in its original packaging.
Return procedure for LDP01-30AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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